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

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