Dilepton production in pion-nucleon collisions in an effective field theory approach

被引：14

作者：

Zetenyi, Miklos ^{[1
]}

Wolf, Gyoergy ^{[1
]}

机构：

[1] Hungarian Acad Sci, Inst Particle & Nucl Phys, Wigner Res Ctr Phys, H-1525 Budapest, Hungary

来源：

PHYSICAL REVIEW C | 2012年 / 86卷 / 06期

关键词：

MESON; PHOTOPRODUCTION; SPECTRUM; DECAY;

D O I：

10.1103/PhysRevC.86.065209

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：

We present a model of electron-positron pair production in pion-nucleon collisions in the exclusive reaction pi N -> Ne(+)e(-). The model is based on an effective field theory approach, incorporating 16 baryon resonances below 2 GeV. Parameters of the model are fitted to pion photoproduction data. We present the resulting dilepton invariant mass spectra for pi(-)p collisions up to root s = 1.9 GeV center-of-mass collision energy. These results are meant to give predictions for the planned experiments at the HADES spectrometer in GSI, Darmstadt. DOI: 10.1103/PhysRevC.86.065209

引用

页数：10

共 27 条

[1] Origin of the low-mass electron pair excess in light nucleus-nucleus collisions [J].

Agakichiev, G. ;

Balanda, A. ;

Belver, D. ;

Belyaev, A. V. ;

Blanco, A. ;

Boehmer, M. ;

Boyard, J. L. ;

Braun-Munzinger, P. ;

Cabanelas, P. ;

Castro, E. ;

Chernenko, S. ;

Christ, T. ;

Destefanis, M. ;

Diaz, J. ;

Dohrmann, F. ;

Dybczak, A. ;

Fabbietti, L. ;

Fateev, O. V. ;

Finocchiaro, P. ;

Fonte, P. ;

Friese, J. ;

Froehlich, I. ;

Galatyuk, T. ;

Garzon, J. A. ;

Gernhaeuser, R. ;

Gil, A. ;

Gilardi, C. ;

Goebel, K. ;

Golubeva, M. ;

Gonzalez-Diaz, D. ;

Hennino, Guber T. ;

Holzmann, R. ;

Iori, I. ;

Ivashkin, A. ;

Jurkovic, M. ;

Kaempfer, B. ;

Karavicheva, T. ;

Kirschner, D. ;

Koenig, I. ;

Koenig, W. ;

Kolb, B. W. ;

Kotte, R. ;

Krizek, F. ;

Kruecken, R. ;

Kuehn, W. ;

Kugler, A. ;

Kurepin, A. ;

Lang, S. ;

Lange, J. S. ;

Lapidus, K. .

PHYSICS LETTERS B, 2010, 690 (02) :118-122

[2] e+e- production from pp reactions at BEVALAC energies [J].

Bratkovskaya, EL ;

Cassing, W ;

Effenberger, M ;

Mosel, U .

NUCLEAR PHYSICS A, 1999, 653 (03) :301-317

[3] Form factors and photoproduction amplitudes [J].

Davidson, RM ;

Workman, R .

PHYSICAL REVIEW C, 2001, 63 (02) :5

[4] CHIRAL SYMMETRY AND THE A1 CONTRIBUTION TO THE NUCLEON-NUCLEON INTERACTION [J].

DURSO, JW ;

BROWN, GE ;

SAARELA, M .

NUCLEAR PHYSICS A, 1984, 430 (03) :653-669

[5] Effective Lagrangian Approach to pion photoproduction from the nucleon [J].

Fernandez-Ramirez, C. ;

de Guerra, E. Moya ;

Udias, J. M. .

ANNALS OF PHYSICS, 2006, 321 (06) :1408-1456

[6] Electromagnetic couplings of nucleon resonances [J].

Feuster, T ;

Mosel, U .

NUCLEAR PHYSICS A, 1997, 612 (3-4) :375-390

[7] P-wave polarization of the rho-meson and the dilepton spectrum in dense matter [J].

Friman, B ;

Pirner, HJ .

NUCLEAR PHYSICS A, 1997, 617 (04) :496-509

[8] A MODEL FOR PION ELECTRO-PRODUCTION AND PHOTOPRODUCTION FROM THRESHOLD UP TO 1 GEV [J].

GARCILAZO, H ;

DEGUERRA, EM .

NUCLEAR PHYSICS A, 1993, 562 (04) :521-568

[9] Di-electrons from η-meson Dalitz decay in proton-proton collisions [J].

Kaptari, L. P. ;

Kaempfer, B. .

EUROPEAN PHYSICAL JOURNAL A, 2007, 33 (02) :157-167

[10] Di-electrons from resonances in nucleon-nucleon collisions [J].

Kaptari, L. P. ;

Kaempfer, B. .

PHYSICAL REVIEW C, 2009, 80 (06)

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