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Author |
Martinez de Lejarza, J.J.; Cieri, L.; Rodrigo, G. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Quantum clustering and jet reconstruction at the LHC |
Type |
Journal Article |
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Year |
2022 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume |
106 |
Issue |
3 |
Pages |
036021 - 16pp |
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Abstract |
Clustering is one of the most frequent problems in many domains, in particular, in particle physics where jet reconstruction is central in experimental analyses. Jet clustering at the CERN's Large Hadron Collider (LHC) is computationally expensive and the difficulty of this task will increase with the upcoming High-Luminosity LHC (HL-LHC). In this paper, we study the case in which quantum computing algorithms might improve jet clustering by considering two novel quantum algorithms which may speed up the classical jet clustering algorithms. The first one is a quantum subroutine to compute a Minkowski-based distance between two data points, whereas the second one consists of a quantum circuit to track the maximum into a list of unsorted data. The latter algorithm could be of value beyond particle physics, for instance in statistics. When one or both of these algorithms are implemented into the classical versions of well-known clustering algorithms (K-means, affinity propagation, and k(T) -jet) we obtain efficiencies comparable to those of their classical counterparts. Even more, exponential speed-up could be achieved, in the first two algorithms, in data dimensionality and data length when the distance algorithm or the maximum searching algorithm are applied. |
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Address |
[Martinez de Lejarza, Jorge J.; Cieri, Leandro; Rodrigo, German] Univ Valencia, CSIC, Inst Fis Corpuscular, Parc Cient, E-46980 Valencia, Spain, Email: Jorge.M.Lejarza@ific.uv.es; |
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Amer Physical Soc |
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English |
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ISSN |
2470-0010 |
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WOS:000850823300008 |
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no |
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Is ISI |
yes |
International Collaboration |
no |
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Call Number |
IFIC @ pastor @ |
Serial |
5357 |
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Author |
Camarda, S.; Cieri, L.; Ferrera, G. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Drell-Yan lepton-pair production: qT resummation at N4LL accuracy |
Type |
Journal Article |
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Year |
2023 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
845 |
Issue |
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Pages |
138125 - 12pp |
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Abstract |
We consider Drell-Yan lepton pairs produced in hadronic collisions. We present high-accuracy QCD predictions for the transverse-momentum (qT) distribution and fiducial cross sections in the small qT region. We resum to all perturbative orders the logarithmically enhanced contributions up to the next-to-next-to-next-to-next-to-leading logarithmic (N4LL) accuracy and we include the hard-virtual coefficient at the next-to-next-to-next-to-leading order (N3LO) (i.e. O(& alpha;3S)) with an approximation of the N4LO coefficients. The massive axial-vector and vector contributions up to three loops have also been consistently included. The resummed partonic cross section is convoluted with approximate N3LO parton distribution functions. We show numerical results at LHC energies of resummed qT distributions for Z/& gamma; *, W & PLUSMN; production and decay, including the W & PLUSMN; and Z/& gamma; * ratio, estimating the corresponding uncertainties from missing higher orders corrections and from incomplete or missing perturbative information coefficients at N4LL and N4LO. Our resummed calculation has been encoded in the public numerical program DYTurbo. |
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[Camarda, Stefano] CERN, CH-1211 Geneva, Switzerland, Email: giancarlo.ferrera@mi.infn.it |
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Elsevier |
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English |
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0370-2693 |
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WOS:001067194500001 |
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no |
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yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
5687 |
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Author |
Becchetti, M.; Bonciani, R.; Cieri, L.; Coro, F.; Ripani, F. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Full top-quark mass dependence in diphoton production at NNLO in QCD |
Type |
Journal Article |
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Year |
2024 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
848 |
Issue |
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Pages |
138362 - 7pp |
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Keywords |
Collider phenomenology; Diphoton; Top quark; NNLO |
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Abstract |
In this paper we consider the diphoton production in hadronic collisions at the next-to-next-to-leading order (NNLO) in perturbative QCD, taking into account for the first time the full top quark mass dependence up to two loops (full NNLO). We show selected numerical distributions, highlighting the kinematic regions where the massive corrections are more significant. We make use of the recently computed two-loop massive amplitudes for diphoton production in the quark annihilation channel. The remaining massive contributions at NNLO are also considered, and we comment on the weight of the different types of contributions to the full and complete result. |
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Address |
[Becchetti, Matteo] Univ Torino, Dipartimento Fis, Via Pietro Giuria 1, I-10125 Turin, Italy, Email: matteo.becchetti@unito.it; |
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Elsevier |
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English |
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0370-2693 |
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Notes |
WOS:001131862200001 |
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no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
5873 |
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Permanent link to this record |
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Author |
Cieri, L.; Sborlini, G.F.R. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Exploring QED Effects to Diphoton Production at Hadron Colliders |
Type |
Journal Article |
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Year |
2021 |
Publication |
Symmetry-Basel |
Abbreviated Journal |
Symmetry-Basel |
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Volume |
13 |
Issue |
6 |
Pages |
994 - 17pp |
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Keywords |
diphoton production; QCD corrections; NLO calculations; QED effects |
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Abstract |
In this article, we report phenomenological studies about the impact of O(alpha) corrections to diphoton production at hadron colliders. We explore the application of the Abelianized version of the qT-subtraction method to efficiently compute NLO QED contributions, taking advantage of the symmetries relating QCD and QED corrections. We analyze the experimental consequences due to the selection criteria and we find percent-level deviations for M-gamma gamma > 1TeV. An accurate description of the tail of the invariant mass distribution is very important for new physics searches which have the diphoton process as one of their main backgrounds. Moreover, we emphasize the importance of properly dealing with the observable photons by reproducing the experimental conditions applied to the event reconstruction. |
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Address |
[Cieri, Leandro] Ist Nazl Fis Nucl, Sez Firenze, I-50019 Sesto Fiorentino, Italy, Email: cieri@fi.infn.it; |
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Mdpi |
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English |
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Notes |
WOS:000666940900001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
4898 |
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Permanent link to this record |
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Author |
Catani, S.; Cieri, L. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Multiple soft radiation at one-loop order and the emission of a soft quark-antiquark pair |
Type |
Journal Article |
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Year |
2022 |
Publication |
European Physical Journal C |
Abbreviated Journal |
Eur. Phys. J. C |
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Volume |
82 |
Issue |
2 |
Pages |
97 - 27pp |
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Abstract |
We consider the radiation of two or more soft partons in QCD hard-scattering at one-loop order. The corresponding scattering amplitude is singular, and the singular behaviour is controlled by a process-independent soft current. Using regularization in d = 4 – 2 epsilon space-time dimensions, we explicitly evaluate the ultraviolet and infrared divergent (epsilon-pole) terms of the one-loop soft current for emission of an arbitrary number of soft partons in a generic hard-scattering process. Then we consider the specific case of soft quark-antiquark (q (q) over bar) emission and we compute the one-loop current by including the finite terms. We find that the one-loop soft-q (q) over bar current exhibits a new type of transverse-momentum singularity, which has a quantum (absorptive) origin and a purely non-abelian character. At the squared amplitude (cross section) level, this transverse-momentum singularity produces contributions to multijet production processes in hadron collisions. The one-loop squared current also leads to charge asymmetry terms, which are a distinctive features of soft-q (q) over bar radiation. We also extend these results to the cases of QED and mixed QCDxQED radiative corrections for soft fermion-antifermion emission. |
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Address |
[Cieri, Leandro] Univ Firenze, Ist Nazl Fis Nucl, Sez Firenze, I-50019 Florence, Italy, Email: leandrosanber@gmail.com |
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Springer |
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English |
Summary Language |
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ISSN |
1434-6044 |
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Notes |
WOS:000749553600001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
5098 |
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Permanent link to this record |