| Records |
| Author |
Stefanini, A.M. et al; Deltoro, J.M.; Gadea, A.; Perez-Vidal, R.M.; Valiente Dobon, J.J. |
| Title |
Fusion of 12C+28Si at deep sub-barrier energies |
Type |
Journal Article |
| Year |
2026 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
Volume  |
872 |
Issue |
|
Pages |
140084 - 8pp |
| Keywords |
Heavy-ion fusion; Sub-barrier cross sections; Coupled-channels model; Fusion hindrance |
| Abstract |
The sub-barrier fusion hindrance phenomenon is systematically observed in heavy-ion systems, but its evidence for light-mass cases of astrophysical interest, like C+C, C+O and O+O, is controversial. Their low-energy behaviour may be clarified by studying slightly heavier systems, so to extrapolate their trend to the lighter cases. In this work, fusion of C-12 + Si-28 has been measured down to deep sub-barrier energies, using Si-28 beams from the XTU Tandem accelerator of LNL on thin C-12 targets. Two different set-ups were employed: 1) the fusion-evaporation residues were identified by a detector telescope following an electrostatic beam separator, and 2) coincidences between the gamma-ray array AGATA and segmented silicon detectors DSSD were performed, where the evaporated light charged particles were identified by pulse shape analysis. Fusion cross sections have been obtained in the wide range sigma approximate to 150 mb – 42nb. Coupled-channel (CC) calculations using a Woods-Saxon potential reproduce the data above similar or equal to 0.1 mb. Below that, hindrance shows up and the CC results overestimate the cross sections which get close to the one-dimensional potential tunnelling limit. This suggests that the coupling strengths gradually vanish, as predicted by the adiabatic model. The hindrance threshold follows a recently updated phenomenological systematics. |
| Address |
[Stefanini, A. M.; Goasduff, A.; Angelini, F.; Balogh, M.; Brugnara, D.; Cocconi, P.; Cogo, A.; Conte, A.; Corradi, L.; Deangelis, G.; Ertoprak, A.; Fioretto, E.; Gambalonga, A.; Servin, B. Gongora; Gottardo, A.; Gozzelino, A.; Napoli, D. R.; Perez-Vidal, R. M.; Raniero, W.; Rosso, D.; Scarpa, D.; Stramaccioni, D.; Toniolo, N.; Volpe, V.; Zago, L.] INFN, Lab Nazl Legnaro, I-35020 Legnaro, Italy, Email: Alberto.Stefanini@lnl.infn.it |
| Corporate Author |
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Thesis |
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| Publisher |
Elsevier |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0370-2693 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:001658360600001 |
Approved |
no |
| Is ISI |
yes |
International Collaboration |
yes |
| Call Number |
IFIC @ pastor @ |
Serial |
7035 |
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| Author |
n_TOF Collaboration (Sanchez-Caballero, A. et al); Babiano-Suarez, V.; Balibrea-Correa, J.; Domingo-Pardo, C.; Ladarescu, I.; Lerendegui-Marco, J. |
| Title |
Low-uncertainty measurement of the 239Pu(n,f) cross section at n_TOF in a very broad energy range from 0.02 eV up to 10 MeV |
Type |
Journal Article |
| Year |
2026 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
| Volume |
872 |
Issue |
|
Pages |
140070 - 8pp |
| Keywords |
Nuclear reaction; Neutron-induced reaction; n_TOF; Fission; Cross section measurement; Plutonium-239 |
| Abstract |
The Pu-239(n,f) cross section was measured with uncertainties below 4% from 20 meV up to 10 MeV of neutron energy at CERN's n_TOF facility using a novel fission fragment detector with a 185.59 m flight path. Measured cross section was normalized to 1059(6) eV center dot b in the 9-20 eV energy range, and is consistent within uncertainties with the standard thermal value and the IAEA reference Pu-239(n,f) cross section. Experimental key values include the integral ratio I-3/I-1= 41.20(42) defined by Duran et al. 2024 and the spectrum averaged cross section in Cf-252(sf) reference neutron field of 1802(40) mb. |
| Address |
[Sanchez-Caballero, A.; Cano-Ott, D.; Mendoza, E.; Alcayne, V.; Garcia Perez, J.; Gonzalez-Romero, E.; Martinez, T.; De Rada Fiol, A. Perez; Villamarin, D.; Plaza Del Olmo, J.] Ctr Invest Energet Medioambientales & Tecnol CIEM, Madrid, Spain, Email: adrian.sanchez@ciemat.es; |
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Thesis |
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| Publisher |
Elsevier |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0370-2693 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:001672031200001 |
Approved |
no |
| Is ISI |
yes |
International Collaboration |
yes |
| Call Number |
IFIC @ pastor @ |
Serial |
7047 |
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| Author |
Greljo, A.; Stefanek, B.; Valenti, A. |
| Title |
Cornering natural SUSY at a Tera-Z factory |
Type |
Journal Article |
| Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
| Volume |
871 |
Issue |
|
Pages |
140009 - 8pp |
| Keywords |
Mssm; Susy; Fcc; Ewpo; Lhc; Lep |
| Abstract |
The future circular e(+)e(-) collider (FCC-ee) stands out as the next flagship project in particle physics, dedicated to uncovering the microscopic origin of the Higgs boson. In this context, we assess indirect probes of the Minimal Supersymmetric Standard Model (MSSM), a well-established benchmark hypothesis, exploring the complementarity between Higgs measurements and electroweak precision tests at the Z-pole. We study three key sectors: the heavy Higgs doublet, scalar top partners, and light gauginos and higgsinos, focusing on the parameter space favored by naturalness. Remarkably, the Tera-Z program consistently offers significantly greater indirect sensitivity than the Mega-& planckh; run. While promising, these prospects hinge on reducing SM uncertainties. Accordingly, we highlight key precision observables for targeted theoretical work. |
| Address |
[Greljo, Admir; Valenti, Alessandro] Univ Basel, Dept Phys, Klingelbergstr 82, CH-4056 Basel, Switzerland, Email: admir.greljo@unibas.ch; |
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Thesis |
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| Publisher |
Elsevier |
Place of Publication |
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English |
Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0370-2693 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:001619251400003 |
Approved |
no |
| Is ISI |
yes |
International Collaboration |
yes |
| Call Number |
IFIC @ pastor @ |
Serial |
6945 |
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| Author |
Andreyev, A.N. et al; Algora, A.; Nacher, E. |
| Title |
Electromagnetic moments of 215,217Bi: Probing shell evolution beyond N=126 |
Type |
Journal Article |
| Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
| Volume |
871 |
Issue |
|
Pages |
140013 - 9pp |
| Keywords |
Laser spectroscopy; Hyperfine structure; Dipole magnetic moments; Shell-model calculations |
| Abstract |
The nuclear properties of bismuth isotopes (Z = 83), with just one valence proton above the closed spherical shell at Z = 82, are expected to be governed by a single unpaired proton. However, already in semimagic 209Bi (Z = 83, N = 126), the magnetic moment (mu) strongly deviates from the single-particle Schmidt value. A near linear decrease in μwith the increase of N after the N = 126 magic number was observed up to N = 130. In order to test whether this trend is kept at N> 130 and to reveal the underlying mechanisms, an investigation of Bi-215,Bi-217 (N = 132, 134) has been undertaken. The magnetic dipole and electric quadrupole moments of the I-x= 9/2-nuclear ground states in these isotopes have been measured for the first time using the in-source resonance-ionization spectroscopy technique at ISOLDE (CERN). It has been shown that the linearly decreasing trend of mu(Bi-209,211,213(g)) is broken in Bi-215,Bi-217 with a nearly constant value of μobserved. Experimental data have been compared to calculations in the framework of the configuration-interaction shell model with the monopole-based universal VMU+LS interaction. The peculiarities in the behavior of μ(Bi, 9/2-) with increasing neutron number are explained as being due to the shell evolution, change of the neutron orbitals occupancies and strong configuration mixing beyond N = 130. Also, the difference in the μtrends for bismuth (Z = 83) and astatine (Z = 85) isotopes with N> 126 are reproduced by the shell-model calculations. It is shown that monopole interaction plays noticeable role in the description of the peculiarities of the μbehaviour. Additionally, the extension of the application of the V-MU interaction to the μisotopic trends for heavy nuclei is important for further study of the capabilities of this promising version of the shell-model calculations. |
| Address |
[Andreyev, A. N.; Yue, Z.; Cubiss, J. G.; Harding, R. D.; Raison, C.] Univ York, Sch Phys Engn & Technol, York YO10 5DD, England, Email: barzakh_ae@pnpi.nrcki.ru |
| Corporate Author |
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Thesis |
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| Publisher |
Elsevier |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0370-2693 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:001626949600001 |
Approved |
no |
| Is ISI |
yes |
International Collaboration |
yes |
| Call Number |
IFIC @ pastor @ |
Serial |
6960 |
| Permanent link to this record |
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| |
| Author |
Montesinos, V.; Montaña, G.; Albaladejo, M.; Nieves, J.; Tolos, L. |
| Title |
Melting down a tetraquark: D*D(*) interactions and Tcc(3875)+ in a hot environment |
Type |
Journal Article |
| Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
| Volume |
871 |
Issue |
|
Pages |
140020 - 9pp |
| Keywords |
Exotic hadrons; Finite-temperature calculation |
| Abstract |
We discuss the modification of the properties of the tetraquark-like T-cc(3875)(+) and its heavy quark spin partner, T-cc(4016)*(+) immersed in a hot bath of pions. We consider these exotic states as purely isoscalar DD* and D*D* S-wave bound states, respectively. Finite temperature effects are incorporated through the D and D* state-of-the-art thermal spectral functions calculated in [G. Montana et al., Phys. Rev. D, 102 (2020) 096020], using the imaginary-time formalism. We find important modifications of the DD* and D*D* scattering amplitudes already for T = 80 MeV, and show that the hot-bath lineshapes of these tetraquark-like states strongly depend on their Weinberg molecular content. We find that the thermal T-cc(3875)(+) and T-cc(4016)*(+) spectral functions change more rapidly with temperature for high molecular probabilities P-0. For large values of P-0, the widths significantly increase with temperature, leading to the melting of these exotic states for temperatures larger than 80 MeV. For small molecular components, the changes in the spectral functions of these states due to temperature become significantly less important. All these results show that any future experimental determination of the D-(*D-)* scattering amplitudes at finite temperature will provide valuable insights into the molecular content of the T-cc(3875)(+) and T-cc(4016)*(+) exotics. |
| Address |
[Montesinos, V.; Albaladejo, M.; Nieves, J.] Ctr Mixto CSIC UV, Inst Fis Corpuscular, Inst Invest Paterna, C Catedrat Jose Beltran 2, E-46980 Valencia, Spain, Email: Victor.Montesinos@ific.uv.es; |
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Thesis |
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| Publisher |
Elsevier |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0370-2693 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:001629150300002 |
Approved |
no |
| Is ISI |
yes |
International Collaboration |
yes |
| Call Number |
IFIC @ pastor @ |
Serial |
6977 |
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| Author |
ATLAS Collaboration (Aad, G. et al); Aikot, A.; Amos, K.R.; Bouchhar, N.; Cabrera Urban, S.; Cantero, J.; Castillo Gimenez, V.; Chitishvili, M.; Costa, M.J.; Curcio, F.; Didenko, M.; Escobar, C.; Fiorini, L.; Fuster, J.; Garcia, C.; Garcia Navarro, J.E.; Gomez Delegido, A.J.; Gonzalez de la Hoz, S.; Hofer, J.; Jimenez Ortega, M.; Lacasta, C.; Lanzac Berrocal, M.; Marti-Garcia, S.; Martinez Agullo, P.; Melini, D.; Mitsou, V.A.; Monsonis Romero, L.; Moreno Llacer, M.; Munoz Perez, D.; Navarro-Gonzalez, J.; Poveda, J.; Rubio Jimenez, A.; Ruiz-Martinez, A.; Saibel, A.; Salt, J.; Sanchez Sebastian, V.; Senthilkumar, V.; Soldevila, U.; Sanchez, J.; Torro Pastor, E.; Valero, A.; Valiente Moreno, E.; Valls Ferrer, J.A.; Varriale, L.; Villaplana Perez, M.; Vincent, M.; Vos, M.; Zakareishvili, T. |
| Title |
Measurement of substructure-dependent suppression of large-radius jets with charged particles in Pb plus Pb collisions with ATLAS |
Type |
Journal Article |
| Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
| Volume |
871 |
Issue |
|
Pages |
139929 - 17pp |
| Keywords |
Jet quenching; Quark-gluon plasma; Relativistic heavy-ion collisions; Jets & heavy flavor physics |
| Abstract |
Measurements of jet substructure in Pb+Pb collisions provide key insights into the mechanism of jet quenching in the hot and dense QCD medium created in these collisions.This Letter presents a measurement of the suppression of large-radius jets with a radius parameter of R = 1.0 and its dependence on the jet substructure. The measurement uses 1.72 nb(-1) of Pb+Pb data and 255 pb(-1) of pp data, both at root s(NN) = 5.02 TeV, recorded with the ATLAS detector at the Large Hadron Collider. Large-radius jets are reconstructed by reclustering R = 0.2 calorimetric jets and are measured for transverse momentum above 200 GeV. Jet substructure is evaluated using charged-particle tracks, and the overall level of jet suppression is quantified using the jet nuclear modification factor (R-AA). The jet R-AA is measured as a function of jet p(T), the charged k(t) splitting scale (root d(12)), and the angular separation (Delta R-12) of two leading sub-jets. The jet R-AA gradually decreases with increasing root d(12), implying significantly stronger suppression of large-radius jets with larger k(t) splitting scale. The jet R-AA gradually decreases for Delta R-12 in the range 0.01-0.2 and then remains consistent with a constant for Delta R-12 greater than or similar to 0.2. The observed significant dependence of jet suppression on the jet substructure will provide new insights into its role in the quenching process. |
| Address |
[Desai, A. M.; Fewell, M. P.; Gallagher, J.; Grant, C. M.; Green, M. J.; Jackson, P.; Kong, A. X. Y.; Kull, J.; Pandya, H. D.; Ruggeri, T. A.; Saha, S.; Ting, E. X. L.; White, M. J.] Univ Adelaide, Dept Phys, Adelaide, SA, Australia |
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Thesis |
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| Publisher |
Elsevier |
Place of Publication |
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Editor |
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English |
Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0370-2693 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:001652171500001 |
Approved |
no |
| Is ISI |
yes |
International Collaboration |
yes |
| Call Number |
IFIC @ pastor @ |
Serial |
7083 |
| Permanent link to this record |
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| Author |
ATLAS Collaboration (Aad, G. et al); Aikot, A.; Amos, K.R.; Bouchhar, N.; Cabrera Urban, S.; Cantero, J.; Castillo Gimenez, V.; Chitishvili, M.; Costa, M.J.; Curcio, F.; Didenko, M.; Escobar, C.; Fiorini, L.; Fuster, J.; Garcia, C.; Garcia Navarro, J.E.; Gomez Delegido, A.J.; Gonzalez de la Hoz, S.; Hofer, J.; Jimenez Ortega, M.; Lacasta, C.; Lanzac Berrocal, M.; Marti-Garcia, S.; Martinez Agullo, P.; Melini, D.; Mitsou, V.A.; Monsonis Romero, L.; Moreno Llacer, M.; Munoz Perez, D.; Navarro-Gonzalez, J.; Poveda, J.; Rubio Jimenez, A.; Ruiz-Martinez, A.; Saibel, A.; Salt, J.; Sanchez Sebastian, V.; Senthilkumar, V.; Soldevila, U.; Sanchez, J.; Torro Pastor, E.; Valero, A.; Valiente Moreno, E.; Valls Ferrer, J.A.; Varriale, L.; Villaplana Perez, M.; Vos, M.; Zakareishvili, T. |
| Title |
Search for Higgs boson exotic decays into Lorentz-boosted light bosons in the four-τ final state at √s=13 TeV with the ATLAS detector |
Type |
Journal Article |
| Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
| Volume |
870 |
Issue |
|
Pages |
139843 - 18pp |
| Keywords |
Exotic Higgs decays; Low pt ditau; BSM Higgs; New scalars; New higgs bosons |
| Abstract |
A search for exotic decays of the Higgs boson into a pair of low-mass scalars that subsequently decay into tau -leptons, H -> aa -> tau(+)tau(-)tau(+)tau(-), is presented. In models with Yukawa-like couplings, the decay to tau-leptons is favoured for light a-bosons, with mass in the range of 2m(tau) < m(a) < 2m(b). Results are presented in the range of 4 GeV < m(a) < 15 GeV using the 140 fb(-1) of proton-proton collisions at root s = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider. This search focuses on the scenario where, for both di-tau pairs, one of the tau-leptons decays to hadrons and neutrinos, while the other decays to a muon and neutrinos. In this mass range, the a -> tau(+)tau(-) is Lorentz-boosted and a dedicated muon removal technique is used to reconstruct the di-tau pairs. No significant excess above the Standard Model background prediction is observed. Upper limits on (sigma(H)/sigma(SM)(H)) x B(H -> aa -> 4 tau) at 95% confidence level are provided, ranging from 0.03 to 0.10 depending on the a-boson mass. |
| Address |
[Fewell, M. P.; Gallagher, J.; Grant, C. M.; Green, M. J.; Jackson, P.; Kong, A. X. Y.; Kull, J.; Pandya, H. D.; Ruggeri, T. A.; Saha, S.; Ting, E. X. L.; White, M. J.] Univ Adelaide, Dept Phys, Adelaide, SA, Australia |
| Corporate Author |
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Thesis |
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| Publisher |
Elsevier |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0370-2693 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:001639025700001 |
Approved |
no |
| Is ISI |
yes |
International Collaboration |
yes |
| Call Number |
IFIC @ pastor @ |
Serial |
7013 |
| Permanent link to this record |
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| Author |
ATLAS Collaboration (Aad, G. et al); Aikot, A.; Amos, K.R.; Bouchhar, N.; Cabrera Urban, S.; Cantero, J.; Castillo Gimenez, V.; Chitishvili, M.; Costa, M.J.; Curcio, F.; Didenko, M.; Escobar, C.; Fiorini, L.; Fuster, J.; Garcia, C.; Garcia Navarro, J.E.; Gomez Delegido, A.J.; Gonzalez de la Hoz, S.; Hofer, J.; Jimenez Ortega, M.; Lacasta, C.; Lanzac Berrocal, M.; Marti-Garcia, S.; Martinez Agullo, P.; Melini, D.; Mitsou, V.A.; Monsonis Romero, L.; Moreno Llacer, M.; Munoz Perez, D.; Navarro-Gonzalez, J.; Poveda, J.; Rubio Jimenez, A.; Ruiz-Martinez, A.; Saibel, A.; Salt, J.; Sanchez Sebastian, V.; Senthilkumar, V.; Soldevila, U.; Sanchez, J.; Torro Pastor, E.; Valero, A.; Valiente Moreno, E.; Valls Ferrer, J.A.; Varriale, L.; Villaplana Perez, M.; Vincent, M.; Vos, M.; Zakareishvili, T. |
| Title |
Constraining off-shell Higgs boson production and the Higgs boson total width using WW→ (l, l) final states with the ATLAS detector |
Type |
Journal Article |
| Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
| Volume |
870 |
Issue |
|
Pages |
139898 - 21pp |
| Keywords |
|
| Abstract |
A measurement of off-shell Higgs boson production is performed in the H-* -> W Wchannel. The measurement uses a proton-proton collision dataset with an integrated luminosity of 140 fb(-1) collected at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. Final states in which both bosons decay leptonically are targeted, and events are categorised based on the flavour of the final-state leptons, the jet multiplicity, and the output of neural network-based classifiers. The data are found to be compatible with the Standard Model expectation. An observed (expected) upper bound on the 95% symmetric confidence level interval is set on the rate of off-shell Higgs boson production at a value of 3.4 (4.4) times the Standard Model prediction. These results are combined with the results from the measurement of on-shell Higgs boson production in the same final states to obtain an observed (expected) upper bound at 95% confidence level on the Higgs boson total width of 13.1 (17.3) MeV. |
| Address |
[Desai, A. M.; Fewell, M. P.; Gallagher, J.; Grant, C. M.; Green, M. J.; Jackson, P.; Kong, A. X. Y.; Kull, J.; Pandya, H. D.; Ruggeri, T. A.; Saha, S.; Ting, E. X. L.; White, M. J.] Univ Adelaide, Dept Phys, Adelaide, SA, Australia |
| Corporate Author |
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Thesis |
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| Publisher |
Elsevier |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0370-2693 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
|
| Notes |
WOS:001641499100001 |
Approved |
no |
| Is ISI |
yes |
International Collaboration |
yes |
| Call Number |
IFIC @ pastor @ |
Serial |
7059 |
| Permanent link to this record |
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| Author |
ATLAS Collaboration (Aad, G. et al); Aikot, A.; Amos, K.R.; Bouchhar, N.; Cabrera Urban, S.; Cantero, J.; Carrion Martinez, C.; Castillo Gimenez, V.; Chitishvili, M.; Costa, M.J.; Curcio, F.; Didenko, M.; Escobar, C.; Fiorini, L.; Fuster, J.; Garcia, C.; Garcia Navarro, J.E.; Gonzalez de la Hoz, S.; Hofer, J.; Jimenez Ortega, M.; Lacasta, C.; Lanzac Berrocal, M.; Marti-Garcia, S.; Martinez Agullo, P.; Melini, D.; Mitsou, V.A.; Monsonis Romero, L.; Moreno Llacer, M.; Munoz Perez, D.; Navarro-Gonzalez, J.; Poveda, J.; Rubio Jimenez, A.; Ruiz-Martinez, A.; Saibel, A.; Salt, J.; Sanchez Sebastian, V.; Senthilkumar, V.; Soldevila, U.; Sanchez, J.; Taylor Vara, R.J.; Torro Pastor, E.; Valero, A.; Valiente Moreno, E.; Valls Ferrer, J.A.; Varriale, L.; Villaplana Perez, M.; Vincent, M.; Vos, M.; Wandall-Christensen, K.; Zakareishvili, T. |
| Title |
Observation of double parton scattering in same-sign W boson pair production in pp collisions at √s=13 TeV with the ATLAS detector |
Type |
Journal Article |
| Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
| Volume |
870 |
Issue |
|
Pages |
139892 - 21pp |
| Keywords |
DPS; Same-sign WW |
| Abstract |
This letter reports the measurement of double parton scattering in same-sign W boson pair production with the ATLAS detector. The data set used corresponds to an integrated luminosity of 140 fb(-1) of proton-proton collisions at a center-of-mass energy of 13 TeV, collected during Run 2 of the Large Hadron Collider. The study is performed in final states including two same-charge leptons, electron or muon, missing transverse momentum, and up to one jet. An excess of events is observed over the expected background contributions with a significance of 8.8 standard deviations. The measured fiducial cross section times leptonic branching fraction is 4.59 +/- 0.64 fb. The measurement corresponds to a double parton scattering effective cross section of 10.6 +/- 1.8 mb. |
| Address |
[Desai, A. M.; Fewell, M. P.; Gallagher, J.; Grant, C. M.; Green, M. J.; Jackson, P.; Kong, A. X. Y.; Kull, J.; Pandya, H. D.; Purnell, H. I.; Ruggeri, T. A.; Saha, S.; Ting, E. X. L.; White, M. J.] Univ Adelaide, Dept Phys, Adelaide, SA, Australia |
| Corporate Author |
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Thesis |
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| Publisher |
Elsevier |
Place of Publication |
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| Language |
English |
Summary Language |
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Series Title |
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Abbreviated Series Title |
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Edition |
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| ISSN |
0370-2693 |
ISBN |
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Conference |
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| Notes |
WOS:001644472400001 |
Approved |
no |
| Is ISI |
yes |
International Collaboration |
yes |
| Call Number |
IFIC @ pastor @ |
Serial |
7084 |
| Permanent link to this record |
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| Author |
Gao, F.; Harz, J.; Hati, C.; Lu, Y.; Oldengott, I.M.; White, G. |
| Title |
Sphaleron freeze-in baryogenesis with gravitational waves from the QCD transition |
Type |
Journal Article |
| Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
| Volume |
869 |
Issue |
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Pages |
139849 - 6pp |
| Keywords |
Sphalerons; Lepton asymmetry; Cosmic QCD transition; Gravitational waves |
| Abstract |
A large primordial lepton asymmetry can generate the observed baryon asymmetry of the Universe (BAU) through nonrestoration of electroweak symmetry at a high temperature, suppressing the sphaleron rate (“sphaleron freeze-in”). Such an asymmetry can lead to a first-order cosmic QCD transition with an observable gravitational wave (GW) signal. With next-to-leading order dimensional reduction and the exact 1-loop fluctuation determinant, we find the required lepton asymmetry to be an order of magnitude smaller than previous estimates. We apply a new and improved QCD equation of state reconciling the lattice and functional QCD results, to identify the range of lepton flavor asymmetries inducing a first-order cosmic QCD transition. Consistency with the observational constraints on the lepton asymmetries from the CMB and BBN requires an entropy dilution by a factor of O(10) for the correct BAU, while the first-order QCD transition can itself occur without the need for any entropy dilution. We show that the sphaleron freeze-in paradigm can potentially be probed by future GW experiments like μAres, if the bubble wall velocity of the QCD transition is large. |
| Address |
[Gao, Fei] Beijing Inst Technol, Sch Phys, 5 Zhongguancun South St, Beijing 100081, Peoples R China, Email: fei.gao@bit.edu.cn; |
| Corporate Author |
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| Publisher |
Elsevier |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
|
Series Issue |
|
Edition |
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| ISSN |
0370-2693 |
ISBN |
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Medium |
|
| Area |
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Expedition |
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Conference |
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| Notes |
WOS:001571429100001 |
Approved |
no |
| Is ISI |
yes |
International Collaboration |
yes |
| Call Number |
IFIC @ pastor @ |
Serial |
6846 |
| Permanent link to this record |
