Dilepton production and off-shell transport dynamics at SIS energies

被引：102

作者：

Bratkovskaya, E. L. ^{[1
]}

Cassing, W. ^{[2
]}

机构：

[1] Goethe Univ Frankfurt, Frankfurt Inst Adv Studies, D-60438 Frankfurt, Germany

[2] Univ Giessen, Inst Theoret Phys, D-35392 Giessen, Germany

来源：

NUCLEAR PHYSICS A | 2008年 / 807卷 / 3-4期

关键词：

relativistic heavy-ion collisions; meson production; leptons;

D O I：

10.1016/j.nuclphysa.2008.04.004

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：

Dilepton production in nucleus-nucleus collisions at 1-2A GeV as well as in elementary pp and pd reactions is studied within the microscopic HSD transport approach which includes the off-shell dynamics of vector mesons explicitly. The study addresses additionally the production of pi(0) and eta mesons since their Dalitz decays provide a sizeable contribution to the dilepton invariant mass spectra up to about 0.5 GeV. Our transport results agree with the TAPS experimental data on pi(0) and eta multiplicities in C-12 + C-12 collisions from 0.8 to 2A GeV. We find that the 'DLS-puzzle'-which stands for a theoretical underestimation of the e(+)e(-) yield in the mass range from 0.2 to 0.5 GeV in C-12 + C-12 and Ca-40 + Ca-40 collisions-may be solved when incorporating a stronger bremsstrahlung contribution in line with recent OBE calculations. Moreover, the HSD results with 'enhanced' bremsstrahlung cross sections agree very well with the HADES experimental data for the dilepton mass spectra for 12C + 12C at 1 and 2A GeV, especially when including a collisional broadening in the vector-meson spectral functions. Detailed predictions for dilepton spectra from pp and pn/pd reactions at 1.25 GeV, 2.2 GeV and 3.5 GeV are presented which will allow to verify/falsify the larger bremsstrahlung contributions from the experimental side in the near future. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：214 / 250

页数：37

共 112 条

[1] Dielectron production in 12C+12C collisions at 2A GeV with the HADES spectrometer [J].

Agakichiev, G. ;

Agodi, C. ;

Alvarez-Pol, H. ;

Balanda, A. ;

Bertini, D. ;

Bielcik, J. ;

Bellia, G. ;

Bohmer, M. ;

Bokemeyer, H. ;

Boyard, J. L. ;

Braun-Munzinger, P. ;

Cabanelas, P. ;

Chernenko, S. ;

Christ, T. ;

Coniglione, R. ;

Cosentino, L. ;

Diaz, J. ;

Dohrmann, F. ;

Duran, I. ;

Eberl, T. ;

Enghardt, W. ;

Fabbietti, L. ;

Fateev, O. ;

Fernandez, C. ;

Finocchiaro, P. ;

Friese, J. ;

Froehlich, I. ;

Fuentes, B. ;

Garabatos, C. ;

Garzon, J. A. ;

Gernhaeuser, R. ;

Gilardi, C. ;

Golubeva, M. ;

Gonzalez-Diaz, D. ;

Grosse, E. ;

Guber, F. ;

Hennino, T. ;

Hlavac, S. ;

Holzmann, R. ;

Homolka, J. ;

Ierusalimov, A. ;

Iori, I. ;

Ivashkin, A. ;

Jaskula, M. ;

Jurkovic, M. ;

Kagarlis, M. ;

Kajetanowicz, M. ;

Kaempfer, B. ;

Kanaki, K. ;

Karavicheva, T. .

PHYSICAL REVIEW LETTERS, 2007, 98 (05)

[2] EFFECTS OF PAIR CORRELATIONS IN STATISTICAL GAMMA-DECAY SPECTRA [J].

DOSSING, T ;

KHOO, TL ;

LAURITSEN, T ;

AHMAD, I ;

BLUMENTHAL, D ;

CARPENTER, MP ;

CROWELL, B ;

GASSMANN, D ;

HENRY, RG ;

JANSSENS, RVF ;

NISIUS, D .

PHYSICAL REVIEW LETTERS, 1995, 75 (07) :1276-1279

[3] e+e- -pair production in Pb-Au collisions at 158 GeV per nucleon [J].

Agakichieva, G ;

Appelshäuser, H ;

Bielcikova, J ;

Baur, R ;

Braun-Munzinger, P ;

Cherlin, A ;

Damjanovic, S ;

Drees, A ;

Esumi, S ;

Faschingbauer, U ;

Fraenkel, Z ;

Fuchs, C ;

Gatti, E ;

Glässel, P ;

Hering, G ;

Heros, CPD ;

Holl, P ;

Jung, C ;

Lenkeit, B ;

Marín, A ;

Messer, F ;

Messer, M ;

Miskowiec, D ;

Nix, O ;

Panebrattsev, Y ;

Pfeiffer, A ;

Rak, J ;

Ravinovich, I ;

Razin, S ;

Rehak, P ;

Richter, M ;

Sampietro, M ;

Sako, H ;

Saveljic, N ;

Schmitz, W ;

Schukraft, J ;

Seipp, W ;

Shimanskiy, S ;

Socol, E ;

Specht, HJ ;

Stachel, J ;

Tel-Zur, G ;

Tserruya, I ;

Ullrich, T ;

Voigt, C ;

Voloshin, S ;

Weber, C ;

Wessels, JP ;

Wienold, T ;

Wurm, JP .

EUROPEAN PHYSICAL JOURNAL C, 2005, 41 (04) :475-513

[4]

AGAKISHIEV G, ARXIV07114281 NUCLEX

[5] LOW-MASS LEPTON-PAIR PRODUCTION IN P-BE COLLISIONS AT 450 GEV/C [J].

AKESSON, T ;

ALMEHED, S ;

ANGELIS, ALS ;

ANTOS, J ;

ATHERTON, H ;

AUBRY, P ;

BARTELS, HW ;

BEAUDOIN, G ;

BEAULIEU, JM ;

BEKER, H ;

BENARY, O ;

BETTONI, D ;

BISI, V ;

BLEVIS, I ;

BOGGILD, H ;

CLELAND, W ;

CLEMEN, M ;

COLLICK, B ;

CORRIVEAU, F ;

DAGAN, S ;

DEDERICHS, K ;

DEPOMMIER, P ;

DIGIACOMO, N ;

DILIBERTO, S ;

DODD, JR ;

DOLGOSHEIN, B ;

DREES, A ;

EIDELMAN, S ;

ENYO, H ;

ERLANDSSON, B ;

ESTEN, MJ ;

FABJAN, CW ;

FISCHER, P ;

GAIDOT, A ;

GIBRATDEBU, F ;

GIUBELLINO, P ;

GLASSEL, P ;

GOERLACH, U ;

GOLUBKOV, Y ;

HAGLUND, R ;

HAMEL, LA ;

VANHECKE, H ;

HEDBERG, V ;

HEIFETZ, R ;

HOLSCHER, A ;

JACAK, B ;

JARLSKOG, G ;

JOHANNSON, S ;

KRANER, H ;

KROH, V .

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1995, 68 (01) :47-64

[6] THE FRITIOF MODEL FOR VERY-HIGH-ENERGY HADRONIC COLLISIONS [J].

ANDERSSON, B ;

GUSTAFSON, G ;

HONG, P .

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1993, 57 (03) :485-494

[7] First measurement of the ρ spectral function in high-energy nuclear collisions -: art. no. 162302 [J].

Arnaldi, R ;

Averbeck, R ;

Banicz, K ;

Castor, J ;

Chaurand, B ;

Cicalò, C ;

Colla, A ;

Cortese, P ;

Damjanovic, S ;

David, A ;

De Falco, A ;

Devaux, A ;

Drees, A ;

Ducroux, L ;

En'yo, H ;

Fargeix, J ;

Ferretti, A ;

Floris, M ;

Förster, A ;

Force, P ;

Guettet, N ;

Guichard, A ;

Gulkanian, H ;

Heuser, JM ;

Keil, M ;

Kluberg, L ;

Lourenco, C ;

Lozano, J ;

Manso, F ;

Masoni, A ;

Martins, P ;

Neves, A ;

Ohnishi, H ;

Oppedisano, C ;

Parracho, P ;

Pillot, P ;

Puddu, G ;

Radermacher, E ;

Ramalhete, P ;

Rosinsky, P ;

Scomparin, E ;

Seixas, J ;

Serci, S ;

Shahoyan, R ;

Sonderegger, P ;

Specht, HJ ;

Tieulent, R ;

Usai, G ;

Veenhof, R ;

Wöhri, HK .

PHYSICAL REVIEW LETTERS, 2006, 96 (16)

[8] RHO MESON IN DENSE HADRONIC MATTER [J].

ASAKAWA, M ;

KO, CM ;

LEVAI, P ;

QIU, XJ .

PHYSICAL REVIEW C, 1992, 46 (04) :R1159-R1162

[9] MEDIUM EFFECTS ON THE RHO-MESON [J].

ASAKAWA, M ;

KO, CM .

PHYSICAL REVIEW C, 1993, 48 (02) :R526-R529

[10] QCD SUM-RULES FOR A RHO-MESON IN DENSE MATTER [J].

ASAKAWA, M ;

KO, CM .

NUCLEAR PHYSICS A, 1993, 560 (01) :399-410

← 1 2 3 4 5 6 7 8 9 10 →