Inclusive e+e- production in collisions of pions with protons and nuclei in the second resonance region of baryons

被引：0

作者：

Abou Yassine, R. ^{[6
,13
]}

Adamczewski-Musch, J. ^{[5
]}

Arnold, O. ^{[9
,10
]}

Atomssa, E. T. ^{[13
]}

Becker, M. ^{[11
]}

Behnke, C. ^{[8
]}

Berger-Chen, J. C. ^{[9
,10
]}

Blanco, A. ^{[1
]}

Blume, C. ^{[5
,8
,19
]}

Boehmer, M. ^{[10
]}

Chlad, L. ^{[14
,20
]}

Chudoba, P. ^{[14
,20
]}

Ciepal, I. ^{[3
]}

Deb, S. ^{[13
]}

Deveaux, C. ^{[11
]}

Dittert, D. ^{[6
]}

Dreyer, J. ^{[7
]}

Epple, E. ^{[9
,10
]}

Fabbietti, L. ^{[10
]}

Fonte, P. ^{[1
,21
]}

Franco, C. ^{[1
]}

Friese, J. ^{[10
]}

Froehlich, I. ^{[8
]}

Fortsch, J. ^{[18
]}

Galatyuk, T. ^{[5
,6
,22
]}

Garzon, J. A. ^{[15
]}

Gernhaeuser, R. ^{[10
]}

Greifenhagen, R. ^{[7
,23
]}

Grunwald, M. ^{[17
]}

Gumberidze, M. ^{[5
]}

Harabasz, S. ^{[6
,22
]}

Heinz, T. ^{[5
]}

Hennino, T. ^{[13
]}

Hoehne, C. ^{[5
,11
]}

Hojeij, F. ^{[13
]}

Holzmann, R. ^{[5
]}

Idzik, M. ^{[2
]}

Kaempfer, B. ^{[7
,23
]}

Kampert, K-H. ^{[18
]}

Kardan, B. ^{[8
,19
]}

Kedych, V. ^{[6
]}

Koenig, I. ^{[5
]}

Koenig, W. ^{[5
]}

Kohls, M. ^{[8
,19
]}

Kolas, J. ^{[17
]}

Kolb, B. W. ^{[5
]}

Korcyl, G. ^{[4
]}

Kornakov, G. ^{[17
]}

Kotte, R. ^{[7
]}

Krueger, W. ^{[6
]}

机构：

[1] LIP Lab Instrumentacao & Fis Expt Particulas, P-3004516 Coimbra, Portugal

[2] AGH Univ Krakow, Fac Phys & Appl Comp Sci, PL-30059 Krakow, Poland

[3] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland

[4] Jagiellonian Univ Cracow, Smoluchowski Inst Phys, PL-30059 Krakow, Poland

[5] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

[6] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

[7] Helmholtz Zentrum Dresden Rossendorf, Inst Strahlenphys, D-01314 Dresden, Germany

[8] Goethe Univ, Inst Kernphys, D-60438 Frankfurt, Germany

[9] Excellence Cluster Origin & Struct Universe, D-85748 Garching, Germany

[10] Tech Univ Munich, Phys Dept E62, D-85748 Garching, Germany

[11] Justus Liebig Univ Giessen, Phys Inst 2, D-35392 Giessen, Germany

[12] Frederick Univ, Dept Mech Engn, CY-1036 Nicosia, Cyprus

[13] Univ Paris Saclay, Lab Phys Infinis Irene Joliot Curie 2, CNRS, IN2P3, F-91405 Orsay, France

[14] Czech Acad Sci, Nucl Phys Inst, Rez 25068, Czech Republic

[15] Univ Santiago de Compostela, LabCAF F Fis, Santiago De Compostela 15706 SANTI, Spain

[16] Uniwersytet Warszawski, Inst Fizyki Doswiadczalnej, PL-02093 Warsaw, Poland

[17] Warsaw Univ Technol, Fac Phys, PL-00662 Warsaw, Poland

[18] Berg Univ Wuppertal, Fak Math & Nat Wissensch, Astroteilchenphys, D-42119 Wuppertal, Germany

[19] Helmholtz Res Acad Hesse FAIR HFHF, Campus Frankfurt, D-60438 Frankfurt, Germany

[20] Czech Tech Univ, Prague 16000, Czech Republic

[21] Inst Super Engn Coimbra, Inst Politecn Coimbra, P-3030199 Coimbra, Portugal

[22] Helmholtz Res Acad Hesse FAIR HFHF, Campus Darmstadt, D-64390 Darmstadt, Germany

[23] Tech Univ Dresden, D-01062 Dresden, Germany

[24] Jagiellonian Univ, Doctoral Sch Exact & Nat Sci, Krakow, Poland

[25] Charles Univ Prague, Fac Math & Phys, Prague 12116, Czech Republic

[26] Univ Torino, Dipartimento Fis, I-10125 Turin, Italy

[27] Univ Torino, INFN, I-10125 Turin, Italy

[28] Univ Wroclaw, PL-50204 Wroclaw, Poland

来源：

PHYSICAL REVIEW C | 2025年 / 111卷 / 02期

关键词：

VECTOR-MESON DOMINANCE; FORM-FACTORS;

D O I：

10.1103/PhysRevC.111.024908

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Inclusive e(+) e(-) production has been studied with HADES in pi(-) + p, pi(-) + C, and pi(-) + CH2 reactions, using the GSI pion beam at root s(pi p) = 1.49 GeV. Invariant mass and transverse momentum distributions have been measured and reveal contributions from Dalitz decays of pi(0), eta mesons, and baryon resonances. The transverse momentum distributions are very sensitive to the underlying kinematics of the various processes. The baryon contribution exhibits a deviation up to a factor seven from the QED reference expected for the dielectron decay of a hypothetical pointlike baryon with the production cross section constrained from the inverse gamma n -> pi(-) p reaction. The enhancement is attributed to a strong four-momentum squared dependence of the timelike electromagnetic transition form factors as suggested by vector meson dominance (VMD). Two versions of the VMD that differ in the photon-baryon coupling have been applied in simulations and compared to data. VMD1 (or two-component VMD) assumes a coupling via the rho meson and a direct coupling of the photon, while in VMD2 (or strict VMD) the coupling is only mediated via the rho meson. The VMD2 model, frequently used in transport calculations for dilepton decays, is found to overestimate the measured dielectron yields, while a good description of the data can be obtained with the VMD1 model assuming no phase difference between the two amplitudes. Similar descriptions have also been obtained using a timelike baryon transition form factor model where the pion cloud plays the major role.

引用

页数：13

共 37 条

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