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Author |
Miyahara, K.; Hyodo, T.; Oka, M.; Nieves, J.; Oset, E. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Theoretical study of the Xi(1620) and Xi(1690) resonances in Xi(c)-> pi(+) MB decays |
Type |
Journal Article |
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Year |
2017 |
Publication |
Physical Review C |
Abbreviated Journal |
Phys. Rev. C |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
95 |
Issue |
3 |
Pages |
035212 - 12pp |
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Abstract |
Nonleptonic weak decays of Xi(c) into pi(+) and a meson (M)-baryon (B) final state, MB, are analyzed from the viewpoint of probing S = -2 baryon resonances, i.e., Xi(1620) and Xi(1690), of which spin-parity and other properties are not well known. We argue that the weak decay of Xi(c) is dominated by a single quark-line diagram, preferred by the Cabibbo-Kobayashi-Maskawa coefficient, color recombination factor, the diquark correlation, and the kinematical condition. The decay process has an advantage of being free from meson resonances in the p+ M invariantmass distribution. The invariant mass distribution of the meson-baryon final state is calculated with three different chiral unitary approaches, assuming that the Xi(1620) and Xi(1690) resonances have J(P) = 1/2(-). It is found that a clear peak for the Xi(1690) is seen in the pi Xi and K Lambda spectra. We also suggest that the ratios of the pi Xi, K Lambda, and K Sigma final states are useful to distinguish whether the peak is originated from the Xi(1690) resonance or it is a K Sigma threshold effect. |
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Address |
[Miyahara, Kenta] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan, Email: miyahara.kenta.62r@st.kyoto-u.ac.jp |
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Amer Physical Soc |
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2469-9985 |
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Notes |
WOS:000399144100008 |
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no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
3044 |
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Author |
Roca, L.; Oset, E. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Role of a triangle singularity in the pi Delta decay of N(1700)(3/2(-)) |
Type |
Journal Article |
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Year |
2017 |
Publication |
Physical Review C |
Abbreviated Journal |
Phys. Rev. C |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
95 |
Issue |
6 |
Pages |
065211 - 8pp |
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Abstract |
We show the important role played by the pi Delta(1232) channel in the build up of the N(1700)(3/2(-)) resonance due to the nontrivial enhancement produced by a singularity of a triangular loop. The N(1700) is one of the dynamically generated resonances produced by the coupled-channel vector-baryon interaction. The pi Delta channel was neglected in previous works but we show that it has to be incorporated into the coupled-channel formalism due to an enhancement produced by a singularity in the triangular loop with., nucleon, and p as internal loop lines and pi and Delta as external ones. The enhancement is of nonresonant origin but it contributes to the dynamical generation of the N(1700) resonance due to the nonlinear dynamics involved in the coupled-channel mechanisms. We obtain an important increase of the total width of the N(1700) resonance when the pi Delta channel is included and provide predictions for the partial widths of the N(1700) decays into VB and pi Delta. |
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[Roca, L.] Univ Murcia, Dept Fis, E-30100 Murcia, Spain |
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Amer Physical Soc |
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2469-9985 |
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Notes |
WOS:000404022100005 |
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no |
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Is ISI |
yes |
International Collaboration |
no |
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Call Number |
IFIC @ pastor @ |
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3177 |
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Author |
Geng, L.S.; Oset, E. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Novel nonperturbative approach for radiative (B)over-bar(0)((B)over-bar(s)(0)) -> J/psi gamma decays |
Type |
Journal Article |
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Year |
2016 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
94 |
Issue |
1 |
Pages |
014018 - 11pp |
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Abstract |
Radiative (B) over bar (0)((B) over bar (0)(s)) -> J/psi gamma decays provide an interesting case to test our understanding of ( non) perturbative QCD and eventually to probe physics beyond the standard model. Recently, the LHCb Collaboration reported an upper bound, updating the results of the BABAR Collaboration. Previous theoretical predictions based on QCD factorization or perturbative QCD have shown large variations due to different treatment of nonfactorizable contributions and meson-photon transitions. In this paper, we report on a novel approach to estimate the decay rates, which is based on a recently proposed model for B decays and the vector meson dominance hypothesis, widely tested in the relevant energy regions. The predicted branching ratios are Br[(B) over bar (0) -> J/psi gamma] = (3.50 +/- 0.34(-0.63)(+1.12)) x 10(-8) and Br[(B) over bar (0)(s) -> J/psi gamma] = (7.20 +/- 0.68(-1.30)(+2.31)) x 10(-7). The first uncertainty is systematic and the second is statistical, originating from the experimental (B) over bar (0)(s) -> J/psi gamma branching ratio. |
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Address |
[Geng, Li-Sheng] Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China, Email: lisheng.geng@buaa.edu.cn |
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Amer Physical Soc |
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2470-0010 |
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Notes |
WOS:000380111000004 |
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no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
2767 |
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Permanent link to this record |
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Author |
Dias, J.M.; Navarra, F.S.; Nielsen, M.; Oset, E. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
f(0)(980) production in D-s(+)-> pi(+) pi(+) pi(-) and D-s(+) -> pi(+) K+ K- decays |
Type |
Journal Article |
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Year |
2016 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
94 |
Issue |
9 |
Pages |
096002 - 8pp |
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Abstract |
We study the D-s(+)-> pi(+) pi(+) pi(-) and D-s(+) -> pi(+) K+ K- decays adopting a mechanism in which the D-s(+) meson decays weakly into a pi+ and a q (q) over bar component, which hadronizes into two pseudoscalar mesons. The final state interaction between these two pseudoscalar mesons is taken into account by using the chiral unitary approach in coupled channels, which gives rise to the f(0)(980) resonance. Hence, we obtain the invariant mass distributions of the pairs pi(+) pi(-) and K+ K- after the decay of that resonance and compare our theoretical amplitudes with those available from the experimental data. Our results are in a fair agreement with the shape of these data, within large experimental uncertainty, and a f(0)(980) signal is seen in both the pi(+) pi(-) and K+ K- distributions. Predictions for the relative size of pi(+) pi(-) and K+ K- distributions are made. |
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Address |
[Dias, J. M.; Navarra, F. S.; Nielsen, M.] Univ Sao Paulo, Inst Fis, CP 66318, BR-05389970 Sao Paulo, SP, Brazil, Email: jdias@if.usp.br; |
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Amer Physical Soc |
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2470-0010 |
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Notes |
WOS:000386896900006 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
2843 |
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Permanent link to this record |
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Author |
Bayar, M.; Aceti, F.; Guo, F.K.; Oset, E. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Discussion on triangle singularities in the Lambda(b) -> J/psi K(-)p reaction |
Type |
Journal Article |
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Year |
2016 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
94 |
Issue |
7 |
Pages |
074039 - 10pp |
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Abstract |
We have analyzed the singularities of a triangle loop integral in detail and derived a formula for an easy evaluation of the triangle singularity on the physical boundary. It is applied to the Lambda(b) -> J/psi K(-)p process via Lambda*-charmonium-proton intermediate states. Although the evaluation of absolute rates is not possible, we identify the chi(c1) and the psi(2S)as the relatively most relevant states among all possible charmonia up to the psi(2S). The Lambda(1890)chi(c1)p loop is very special, as its normal threshold and triangle singularities merge at about 4.45 GeV, generating a narrow and prominent peak in the amplitude in the case that the chi(c1)p is in an S wave. We also see that loops with the same charmonium and other Lambda* hyperons produce less dramatic peaks from the threshold singularity alone. For the case of chi(c1)p -> J/psi p and quantum numbers 3/2(-) or 5/2(+), one needs P and D waves, respectively, in the chi(c1)p, which drastically reduce the strength of the contribution and smooth the threshold peak. In this case, we conclude that the singularities cannot account for the observed narrow peak. In the case of 1/2(+), 3/2(-) quantum numbers, where chi(c1)p -> J/psi p can proceed in an S wave, the Lambda(1890)chi(c1)p triangle diagram could play an important role, though neither can assert their strength without further input from experiments and lattice QCD calculations. |
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Address |
[Bayar, Melahat] Kocaeli Univ, Dept Phys, TR-41380 Izmit, Turkey |
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Amer Physical Soc |
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2470-0010 |
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Notes |
WOS:000387256100003 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
2854 |
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Permanent link to this record |
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Author |
Aceti, F.; Dai, L.R.; Oset, E. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
a(1)(1420) peak as the pi f(0)(980) decay mode of the a(1)(1260) |
Type |
Journal Article |
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Year |
2016 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
94 |
Issue |
9 |
Pages |
096015 - 9pp |
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Abstract |
We study the decay mode of the a(1)(1260) into a pi(+) in p wave and the f(0)(980) that decays into pi(+)pi(-) in s wave. The mechanism proceeds via a triangular mechanism where the a(1)(1260) decays into K*K-, the K* decays to an external pi(+) and an internal K that fuses with the (K) over bar producing the f(0)(980) resonance. The mechanism develops a singularity at a mass of the a(1)(1260) around 1420 MeV, producing a peak in the cross section of the pp reaction, used to generate the mesonic final state, which provides a natural explanation of all the features observed in the COMPASS experiment, where a peak observed at this energy is tentatively associated to a new resonance called a(1)(1420). On the other hand, the triangular singularity studied here gives rise to a remarkable feature, where a peak is seen for a certain decay channel of a resonance at an energy about 200 MeV higher than its nominal mass. |
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Address |
[Aceti, F.; Dai, L. R.; Oset, E.] Univ Valencia, Dept Fis Teor, CSIC, Inst Invest Paterna, Aptdo 22085, Valencia 46071, Spain, Email: aceti@ific.uv.es; |
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Amer Physical Soc |
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2470-0010 |
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Notes |
WOS:000388824300007 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
2912 |
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Permanent link to this record |
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Author |
Ikeno, N.; Oset, E. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Semileptonic Lambda(c) decay to nu l(+) and Lambda(1405) |
Type |
Journal Article |
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Year |
2016 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
93 |
Issue |
1 |
Pages |
014021 - 7pp |
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Abstract |
We study the semileptonic decay of Lambda(c) to nu l(+) and Lambda(1405), where the Lambda(1405) is seen in the invariant mass distribution of pi Sigma. We perform the hadronization of the quarks produced in the reaction in order to have a meson baryon pair in the final state and then let these hadron pairs undergo final state interaction from where the Lambda(1405) is dynamically generated. The reaction is particularly suited to study this resonance, because we show that it filters I = 0. It is also free of tree-level pi Sigma production, which leads to a clean signal of the resonance with no background. This same feature has as a consequence that one populates the state of the Lambda(1405) with higher mass around 1420 MeV, predicted by the chiral unitary approach. We make absolute predictions for the invariant mass distributions and find them within the measurable range in present facilities. The implementation of this reaction would allow us to gain insight into the existence of the predicted two Lambda(1405) states and their nature as molecular states. |
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Address |
[Ikeno, N.] Tottori Univ, Dept Reg Environm, Tottori 6808551, Japan, Email: ikeno@rs.tottori-u.ac.jp; |
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Amer Physical Soc |
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ISSN |
1550-7998 |
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Notes |
WOS:000368516300002 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
2534 |
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Permanent link to this record |
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Author |
Xie, J.J.; Oset, E.; Geng, L.S. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Photoproduction of the f(2)'(1525), a(2)(1320), and K-2(*) (1430) |
Type |
Journal Article |
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Year |
2016 |
Publication |
Physical Review C |
Abbreviated Journal |
Phys. Rev. C |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
93 |
Issue |
2 |
Pages |
025202 - 8pp |
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Abstract |
Assuming that the f(2)'(1525), a(2)(1320), and K-2(*) (1430) resonances are dynamically generated states from vector-meson-vector-meson interactions in the s-wave with spin S = 2, we study the gamma p -> f(2)'(1525)p, gamma p -> a(2)(0)(1320)p, and gamma p -> K-2(*)(1430)Lambda(Sigma) reactions. These reactions proceed in the following way: the incoming photon first mutates into a rho(0), omega, or phi meson via vector-meson dominance, which then interacts with the rho(0), omega, or K* emitted by the incoming proton to form the tensor mesons f(2)(')(1525), a(2)(1320), and K-2(*)(1430). The picture is simple and has no free parameters, as all the parameters of the mechanism have been fixed in previous studies. We predict the differential and total cross sections of these reactions. The results can be tested in future experiments and therefore offer new clues about the nature of these tensor states. |
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Address |
[Xie, Ju-Jun; Oset, E.] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China, Email: lisheng.geng@buaa.edu.cn |
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Amer Physical Soc |
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2469-9985 |
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Notes |
WOS:000369729400004 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
2557 |
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Permanent link to this record |
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Author |
Sun, Z.F.; Bayar, M.; Fernandez-Soler, P.; Oset, E. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Ds0*(2317)(+) in the decay of Bc into J/Psi DK |
Type |
Journal Article |
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Year |
2016 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
93 |
Issue |
5 |
Pages |
054028 - 9pp |
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Abstract |
In this paper we study the relationship between the D-s0*(2317)(+) resonance and the decay of the B-c meson into J/Psi DK. In this process, the B-c meson decays first into J/Psi and the quark pair c (s) over bar, and then the quark pair hadronizes into DK or D-s eta components, which undergo final state interaction. This final state interaction, generating the D-s0*(2317)(+) resonance, is described by the chiral unitary approach. With the parameters which allow us to match the pole position of the D-s0*(2317)(+), we obtain the DK invariant mass distribution of the decay B-c -> J/Psi DK, and also the rate for B-c -> J/Psi D-s0*(2317). The ratio of these two magnitudes is then predicted. |
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Address |
[Sun, Zhi-Feng; Fernandez-Soler, P.; Oset, E.] Univ Valencia, CSIC, Dept Fis Teor, Inst Invest Paterna,Ctr Mixto, Apartado 22085, Valencia 46071, Spain |
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Amer Physical Soc |
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2470-0010 |
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Notes |
WOS:000372417900002 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
2583 |
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Permanent link to this record |
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Author |
Xie, J.J.; Liang, W.H.; Oset, E. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
(K)over-bar-induced formation of the f(0)(980) and a(0)(980) resonances on proton targets |
Type |
Journal Article |
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Year |
2016 |
Publication |
Physical Review C |
Abbreviated Journal |
Phys. Rev. C |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
93 |
Issue |
3 |
Pages |
035206 - 8pp |
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Keywords |
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Abstract |
We perform a calculation of the cross section for nine reactions induced by (K) over bar scattering on protons. The reactions studied are K- p -> Lambda pi(+)pi(-), K- p -> Sigma(0)pi(+)pi(-), K- p -> Lambda pi(0)eta, K- p -> Sigma(0)pi(0)eta, K- p -> Sigma(+)pi(-)eta, (K) over bar (0) p -> Lambda pi(+)eta, (K) over bar (0) p -> Sigma(0)pi(+)eta, (K) over bar (0) p -> Sigma(+)pi(+)pi(-), and (K) over bar (0) p -> Sigma+pi(0)eta. We find that in the reactions producing pi(+)pi(-), a clear peak for the f(0)(980) resonance is found, while no trace of f(0)(500) appears. Similarly, in the cases of p. production, a strong peak is found for the a(0)(980) resonance, with the characteristic strong cusp shape. Cross sections and invariant mass distributions are evaluated which should serve, by comparing them with future data, to test the dynamics of the chiral unitary approach used for the evaluations and the nature of these resonances. |
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Address |
[Xie, Ju-Jun; Oset, E.] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China, Email: xiejujun@impcas.ac.cn; |
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Amer Physical Soc |
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Edition |
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|
|
ISSN |
2469-9985 |
ISBN |
|
Medium |
|
|
|
Area |
|
Expedition |
|
Conference |
|
|
|
Notes |
WOS:000372719900005 |
Approved |
no |
|
|
Is ISI |
yes |
International Collaboration |
yes |
|
|
Call Number |
IFIC @ pastor @ |
Serial |
2605 |
|
Permanent link to this record |