Modification of the ρ meson detected by low-mass electron–positron pairs in central Pb-Au collisions at 158A GeV/c

Adamová, Dagmar; Agakishiev, Geydar; Antończyk, Dariusz; Appelshäuser, Harald; Belaga, Victoria Vladimirovna; Bielčíková, Jana; Braun-Munzinger, Peter; Busch, Oliver; Cherlin, Alexander; Damjanović, Sanja; Dietel, Thomas; Dietrich, Lars; Drees, Axel; Dubitzky, Wilrid; Esumi, ShinIchi; Filimonov, Kirill; Fomenko, Kirill; Fraenkel, Zeev; Garabatos, Chilo; Glässel, Peter; Holeczek, Jacek; Kushpil, Vasilii V.; Maas, Axel Torsten; Marín, Ana; Milošević, Jovan; Milov, Alexander; Miśkowiec, Dariusz Czesław; Panebrattsev, Yuri; Petchenova, Olga; Petráček, Vojtech; Pfeiffer, Andreas; Rak, Jan; Ravinovich, Ilia; Rehak, Pavel; Sako, Hiroyuki; Schmitz, Wolfgang; Sedykh, Sergei; Shimansky, Sepan; Stachel, Johanna; Šumbera, Michal; Tilsner, Heinz; Tserruya, Itzhak; Wessels, Johannes P.; Wienold, Thomas; Wurm, Johann Peter; Xie, Wei; Yurevich, Sergey; Yurevich, Vladimir

doi:10.1016/j.physletb.2008.07.104

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Modification of the ρ meson detected by low-mass electron–positron pairs in central Pb-Au collisions at 158A GeV/c

We present a measurement of e+e− pair production in central PbAu collisions at 158A GeV/c. As reported earlier, a significant excess of the e+e− pair yield over the expectation from hadron decays is observed. The improved mass resolution of the present data set, recorded with the upgraded CERES experiment at the CERN-SPS, allows for a comparison of the data with different theoretical approaches. The data clearly favor a substantial in-medium broadening of the ρ spectral function over a density-dependent shift of the ρ pole mass. The in-medium broadening model implies that baryon induced interactions are the key mechanism to the observed modifications of the ρ meson at SPS energy.

Metadaten
Author:	Dagmar Adamová ORCiD GND, Geydar Agakishiev GND, Dariusz Antończyk GND, Harald Appelshäuser ORCiD GND, Victoria Vladimirovna Belaga, Jana Bielčíková ORCiD GND, Peter Braun-Munzinger ORCiD GND, Oliver Busch GND, Alexander Cherlin ORCiD, Sanja Damjanović ORCiD GND, Thomas Dietel ORCiD GND, Lars Dietrich GND, Axel Drees ORCiD GND, Wilrid Dubitzky GND, ShinIchi Esumi ORCiD GND, Kirill Filimonov GND, Kirill Fomenko, Zeev Fraenkel, Chilo Garabatos ORCiD GND, Peter Glässel ORCiD GND, Jacek Holeczek, Vasilii V. Kushpil, Axel Torsten Maas ORCiD GND, Ana Marín ORCiD GND, Jovan Milošević ORCiD GND, Alexander Milov ORCiD, Dariusz Czesław Miśkowiec ORCiD, Yuri Panebrattsev, Olga Petchenova GND, Vojtech Petráček GND, Andreas Pfeiffer ORCiD GND, Jan Rak GND, Ilia Ravinovich ORCiD, Pavel Rehak, Hiroyuki Sako ORCiD, Wolfgang Schmitz GND, Sergei Sedykh, Sepan Shimansky ORCiD, Johanna Stachel ORCiD GND, Michal Šumbera ORCiD, Heinz Tilsner GND, Itzhak Tserruya ORCiD, Johannes P. Wessels ORCiD GND, Thomas Wienold GND, Johann Peter Wurm GND, Wei Xie ORCiD, Sergey Yurevich GND, Vladimir Yurevich
URN:	urn:nbn:de:hebis:30:3-766250
DOI:	https://doi.org/10.1016/j.physletb.2008.07.104
ISSN:	0370-2693
Parent Title (English):	Physics Letters B
Publisher:	Elsevier
Place of publication:	Amsterdam
Document Type:	Article
Language:	English
Date of Publication (online):	2008/08/07
Date of first Publication:	2008/08/07
Publishing Institution:	Universitätsbibliothek Johann Christian Senckenberg
Release Date:	2023/10/27
Volume:	666
Issue:	5
Page Number:	5
First Page:	425
Last Page:	429
HeBIS-PPN:	517560860
Institutes:	Physik / Physik
	Informatik und Mathematik / Informatik
	Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS)
Dewey Decimal Classification:	5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:	Universitätspublikationen
Licence (German):	Creative Commons - Namensnennung 4.0

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Modification of the ρ meson detected by low-mass electron–positron pairs in central Pb-Au collisions at 158A GeV/c

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