First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter

被引：38

作者：

Agakishiev, G. ^{[7
]}

Balanda, A. ^{[4
]}

Belver, D. ^{[18
]}

Belyaev, A. ^{[4
,7
]}

Berger-Chen, J. C. ^{[8
]}

Blanco, A. ^{[3
]}

Boehmer, M. ^{[9
]}

Boyard, J. L. ^{[16
]}

Cabanelas, P. ^{[18
]}

Chernenko, S. ^{[7
]}

Dybczak, A.

Epple, E. ^{[8
]}

Fabbietti, L. ^{[8
]}

Fateev, O. ^{[7
]}

Finocchiaro, P. ^{[2
]}

Fonte, P. ^{[3
,23
]}

Friese, J. ^{[9
]}

Froehlich, I. ^{[1
]}

Galatyuk, T. ^{[1
,24
]}

Garzon, J. A. ^{[18
]}

Gernhaeuser, R. ^{[9
]}

Goebel, K. ^{[1
]}

Golubeva, M. ^{[12
]}

Gonzalez-Diaz, D. ^{[19
]}

Guber, F. ^{[12
]}

Gumberidze, M. ^{[16
]}

Heinz, T. ^{[5
]}

Hennino, T. ^{[16
]}

Holzmann, R. ^{[5
]}

Ierusalimov, A. ^{[7
]}

Iori, I. ^{[11
,25
]}

Ivashkin, A. ^{[12
]}

Jurkovic, M. ^{[9
]}

Kaempfer, B. ^{[26
]}

Karavicheva, T. ^{[12
]}

Koenig, I. ^{[5
]}

Koenig, W. ^{[5
]}

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

Kornakov, G. ^{[18
]}

Kotte, R. ^{[6
]}

Krasa, A. ^{[17
]}

Krizek, F. ^{[17
]}

Kruecken, R. ^{[9
]}

Kuc, H. ^{[16
]}

Kuehn, W. ^{[10
]}

Kugler, A. ^{[17
]}

Kurepin, A. ^{[12
]}

Ladygin, V. ^{[7
]}

Lalik, R. ^{[8
]}

Lang, S. ^{[5
]}

机构：

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

[2] Ist Nazl Fis Nucl, Lab Nacl Sud, I-95125 Catania, Italy

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

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

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

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

[7] Joint Inst Nucl Res, Dubna 141980, Russia

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

[9] Tech Univ Munich, Phys Dept E12, D-85748 Garching, Germany

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

[11] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy

[12] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[13] Inst Theoret & Expt Phys, Moscow 117218, Russia

[14] Frederick Univ, CY-1036 Nicosia, Cyprus

[15] Univ Cyprus, Dept Phys, CY-1678 Nicosia, Cyprus

[16] Univ Paris Sud, CNRS, IN2P3, Inst Phys Nucl UMR 8608, F-91406 Orsay, France

[17] Acad Sci Czech Republ, Inst Nucl Phys, CZ-25068 Rez, Czech Republic

[18] Univ Santiago de Compostela, Dpto Fis Particulas, LabCAF, Santiago De Compostela 15706, Spain

[19] Tech Univ Darmstadt, Darmstadt, Germany

[20] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[21] Univ Turin, Dipartimento Fis Gen, I-10125 Turin, Italy

[22] Univ Turin, INFN, I-10125 Turin, Italy

[23] ISEC Coimbra, Coimbra, Portugal

[24] ExtreMe Matter Inst EMMI, D-64291 Darmstadt, Germany

[25] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

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

[27] Univ Houston, Houston, TX USA

来源：

PHYSICS LETTERS B | 2012年 / 715卷 / 4-5期

关键词：

VECTOR-MESONS;

D O I：

10.1016/j.physletb.2012.08.004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present data on dielectron emission in proton induced reactions on a Nb target at 3.5 GeV kinetic beam energy measured with HADES installed at GSI. The data represent the first high statistics measurement of proton-induced dielectron radiation from cold nuclear matter in a kinematic regime, where strong medium effects are expected. Combined with the good mass resolution of 2%, it is the first measurement sensitive to changes of the spectral functions of vector mesons, as predicted by models for hadrons at rest or small relative momenta. Comparing the e(+)e(-) invariant mass spectra to elementary p + p data, we observe for e(+)e(-) momenta P-ee < 0.8 GeV/c a strong modification of the shape of the spectrum, which we attribute to an additional rho-like contribution and a decrease of omega yield. These opposite trends are tentatively interpreted as a strong coupling of the rho meson to baryonic resonances and an absorption of the omega meson, which are two aspects of in-medium modification of vector mesons. (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：304 / 309

页数：6

共 36 条

[1] Modification of the ρ meson detected by low-mass electron-positron pairs in central Pb-Au collisions at 158A GeV/c
Adamova, D.
Agakichiev, G.
Antonczyk, D.
Appelshaeuser, H.
Belaga, V.
Bielcikova, J.
Braun-Munzinger, P.
Busch, O.
Cherlin, A.
Damjanovic, S.
Dietel, T.
Dietrich, L.
Drees, A.
Dubitzky, W.
Esumi, S. I.
Filimonov, K.
Fomenko, K.
Fraenkel, Z.
Garabatos, C.
Glaessel, P.
Holeczek, J.
Kushpil, V.
Maas, A.
Marin, A.
Milosevic, J.
Milov, A.
Miskowiec, D.
Panebrattsev, Yu.
Petchenova, O.
Petracek, V.
Pfeiffer, A.
Rak, J.
Ravinovich, I.
Rehak, P.
Sako, H.
Schmitz, W.
Sedykh, S.
Shimansky, S.
Stachel, J.
Sumbera, M.
Tilsner, H.
Tserruya, I.
Wessels, J. P.
Wienold, T.
Wurm, J. P.
Xie, W.
Yurevich, S.
Yurevich, V.
[J]. PHYSICS LETTERS B, 2008, 666 (05) : 425 - 429
[2] The high-acceptance dielectron spectrometer HADES
Agakichiev, G.
Agodi, C.
Alvarez-Pol, H.
Atkin, E.
Badura, E.
Balanda, A.
Bassi, A.
Bassini, R.
Bellia, G.
Belver, D.
Belyaev, A. V.
Benovic, M.
Bertini, D.
Bielcik, J.
Boehmer, M.
Boiano, C.
Bokemeyer, H.
Bartolotti, A.
Boyard, J. L.
Brambilla, S.
Braun-Munzinger, P.
Cabanelas, P.
Castro, E.
Chepurnov, V.
Chernenko, S.
Christ, T.
Coniglione, R.
Cosentino, L.
Dahlinger, M.
Daues, H. W.
Destefanis, M.
Diaz, J.
Dohrmann, F.
Dressler, R.
Duran, I.
Dybczak, A.
Eberl, T.
Enghardt, W.
Fabbietti, L.
Fateev, O. V.
Fernandez, C.
Finocchiaro, P.
Friese, J.
Froehlich, I.
Fuentes, B.
Galatyuk, T.
Garabatos, C.
Garzon, J. A.
Genolini, B.
Gernhaeuser, R.
[J]. EUROPEAN PHYSICAL JOURNAL A, 2009, 41 (02) : 243 - 277
[3] AGAKISHIEV G, 2012, EUR PHYS J A, V48
[4] First measurement of the ρ spectral function in high-energy nuclear collisions -: art. no. 162302
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
[J]. PHYSICAL REVIEW LETTERS, 2006, 96 (16)
[5] Baldini A., 1988, LANDOLT BOERNSTEIN G, V12b
[6] PROPERTIES OF VECTOR AND AXIAL-VECTOR MESONS FROM A GENERALIZED NAMBU JONA-LASINIO MODEL
BERNARD, V
MEISSNER, UG
[J]. NUCLEAR PHYSICS A, 1988, 489 (04) : 647 - 670
[7] Total hadronic photoabsorption cross section on nuclei in the nucleon resonance region
Bianchi, N
Muccifora, V
DeSanctis, E
Fantoni, A
Sandri, PL
Polli, E
Reolon, AR
Rossi, P
Anghinolfi, M
Corvisiero, P
Ripani, M
Sanzone, M
Taiuti, M
Zucchiatti, A
[J]. PHYSICAL REVIEW C, 1996, 54 (04): : 1688 - 1699
[8] Cross-sections of large-angle hadron production in proton- and pion-nucleus interactions IV: copper nuclei and beam momenta from ±3 GeV/c to ±15 GeV/c
Bolshakova, A.
Boyko, I.
Chelkov, G.
Dedovitch, D.
Elagin, A.
Gostkin, M.
Guskov, A.
Kroumchtein, Z.
Nefedov, Yu.
Nikolaev, K.
Zhemchugov, A.
Dydak, F.
Wotschack, J.
De Min, A.
Ammosov, V.
Gapienko, V.
Koreshev, V.
Semak, A.
Sviridov, Yu.
Usenko, E.
Zaets, V.
[J]. EUROPEAN PHYSICAL JOURNAL C, 2009, 64 (02): : 181 - 241
[9] Cross sections of large-angle hadron production in proton- and pion-nucleus interactions III: tantalum nuclei and beam momenta from ±3 GeV/c to ±15 GeV/c
Bolshakova, A.
Boyko, I.
Chelkov, G.
Dedovitch, D.
Elagin, A.
Gostkin, M.
Guskov, A.
Kroumchtein, Z.
Nefedov, Y.
Nikolaev, K.
Zhemchugov, A.
Dydak, F.
Wotschack, J.
De Min, A.
Ammosov, V.
Gapienko, V.
Koreshev, V.
Semak, A.
Sviridov, Y.
Usenko, E.
Zaets, V.
[J]. EUROPEAN PHYSICAL JOURNAL C, 2009, 63 (04): : 549 - 609
[10] Cross-sections of large-angle hadron production in proton- and pion-nucleus interactions II: beryllium nuclei and beam momenta from ±3 GeV/c to ±15 GeV/c
Bolshakova, A.
Boyko, I.
Chelkov, G.
Dedovitch, D.
Elagin, A.
Gostkin, M.
Grishin, S.
Guskov, A.
Kroumchtein, Z.
Nefedov, Yu.
Nikolaev, K.
Zhemchugov, A.
Dydak, F.
Wotschack, J.
De Min, A.
Ammosov, V.
Gapienko, V.
Koreshev, V.
Semak, A.
Sviridov, Yu.
Usenko, E.
Zaets, V.
[J]. EUROPEAN PHYSICAL JOURNAL C, 2009, 62 (04): : 697 - 754

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