e+e--pair production in Pb-Au collisions at 158 GeV per nucleon
Eur.Phys.J.C41:475-513,2005 We present the combined results on electron-pair production in 158 GeV/n {Pb-Au} ($\sqrt{s}$= 17.2 GeV) collisions taken at the CERN SPS in 1995 and 1996, and give a detailed account of the data analysis. The enhancement over the reference of neutral meson decays amounts...
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| creator | Agakichiev, G Appelshauser, H Bielcikova, J Baur, R Braun-Munzinger, P Cherlin, A Damjanovic, S Drees, A Esumi, S Faschingbauer, U Fraenkel, Z Fuchs, Ch Gatti, E Glassel, P Hering, G Heros, C. P. de los Holl, P Jung, Ch Lenkeit, B Marin, A Messer, F Messer, M Miskowiec, D Nix, O Panebrattsev, Yu 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, H. J Stachel, J Tel-Zur, G Tserruya, I Ullrich, T Voigt, C Voloshin, S Weber, C Wessels, J. P Wienold, T Wurm, J. P Yurevich, V |
| description | Eur.Phys.J.C41:475-513,2005 We present the combined results on electron-pair production in 158 GeV/n
{Pb-Au} ($\sqrt{s}$= 17.2 GeV) collisions taken at the CERN SPS in 1995 and
1996, and give a detailed account of the data analysis. The enhancement over
the reference of neutral meson decays amounts to a factor of 2.31$\pm0.19
(stat.)\pm0.55 (syst.)\pm0.69 (decays)$ for semi-central collisions (28%
$\sigma/\sigma_{geo}$) when yields are integrated over $m>$ 200 MeV/$c^2$ in
invariant mass. The measured yield, its stronger-than-linear scaling with
$N_{ch}$, and the dominance of low pair $p_t$ strongly suggest an
interpretation as {\it thermal radiation} from pion annihilation in the
hadronic fireball. The shape of the excess centring at $m\approx$ 500
MeV/$c^2$, however, cannot be described without strong medium modifications of
the $\rho$ meson. The results are put into perspective by comparison to
predictions from Brown-Rho scaling governed by chiral symmetry restoration, and
from the spectral-function many-body treatment in which the approach to the
phase boundary is less explicit. |
| doi_str_mv | 10.48550/arxiv.nucl-ex/0506002 |
| format | Article |
| fullrecord | <record><control><sourceid>arxiv_GOX</sourceid><recordid>TN_cdi_arxiv_primary_nucl_ex_0506002</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>nucl_ex_0506002</sourcerecordid><originalsourceid>FETCH-arxiv_primary_nucl_ex_05060023</originalsourceid><addsrcrecordid>eNpjYJAzNNAzsTA1NdBPLKrILNPLK03O0U2t0DcwNTAzMDDiZLBP1U7V1S1IzCxSKCjKTylNLsnMz1PIzFMISNJ1LFVIzs_JySwGChUrJJYoGJpaKLinhikUpBYpgExKzc_jYWBNS8wpTuWF0twMKm6uIc4eumD74guKMnMTiyrjQarjUyviofYaE6kMAPkHO98</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>e+e--pair production in Pb-Au collisions at 158 GeV per nucleon</title><source>arXiv.org</source><creator>Agakichiev, G ; Appelshauser, H ; Bielcikova, J ; Baur, R ; Braun-Munzinger, P ; Cherlin, A ; Damjanovic, S ; Drees, A ; Esumi, S ; Faschingbauer, U ; Fraenkel, Z ; Fuchs, Ch ; Gatti, E ; Glassel, P ; Hering, G ; Heros, C. P. de los ; Holl, P ; Jung, Ch ; Lenkeit, B ; Marin, A ; Messer, F ; Messer, M ; Miskowiec, D ; Nix, O ; Panebrattsev, Yu ; 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, H. J ; Stachel, J ; Tel-Zur, G ; Tserruya, I ; Ullrich, T ; Voigt, C ; Voloshin, S ; Weber, C ; Wessels, J. P ; Wienold, T ; Wurm, J. P ; Yurevich, V</creator><creatorcontrib>Agakichiev, G ; Appelshauser, H ; Bielcikova, J ; Baur, R ; Braun-Munzinger, P ; Cherlin, A ; Damjanovic, S ; Drees, A ; Esumi, S ; Faschingbauer, U ; Fraenkel, Z ; Fuchs, Ch ; Gatti, E ; Glassel, P ; Hering, G ; Heros, C. P. de los ; Holl, P ; Jung, Ch ; Lenkeit, B ; Marin, A ; Messer, F ; Messer, M ; Miskowiec, D ; Nix, O ; Panebrattsev, Yu ; 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, H. J ; Stachel, J ; Tel-Zur, G ; Tserruya, I ; Ullrich, T ; Voigt, C ; Voloshin, S ; Weber, C ; Wessels, J. P ; Wienold, T ; Wurm, J. P ; Yurevich, V</creatorcontrib><description>Eur.Phys.J.C41:475-513,2005 We present the combined results on electron-pair production in 158 GeV/n
{Pb-Au} ($\sqrt{s}$= 17.2 GeV) collisions taken at the CERN SPS in 1995 and
1996, and give a detailed account of the data analysis. The enhancement over
the reference of neutral meson decays amounts to a factor of 2.31$\pm0.19
(stat.)\pm0.55 (syst.)\pm0.69 (decays)$ for semi-central collisions (28%
$\sigma/\sigma_{geo}$) when yields are integrated over $m>$ 200 MeV/$c^2$ in
invariant mass. The measured yield, its stronger-than-linear scaling with
$N_{ch}$, and the dominance of low pair $p_t$ strongly suggest an
interpretation as {\it thermal radiation} from pion annihilation in the
hadronic fireball. The shape of the excess centring at $m\approx$ 500
MeV/$c^2$, however, cannot be described without strong medium modifications of
the $\rho$ meson. The results are put into perspective by comparison to
predictions from Brown-Rho scaling governed by chiral symmetry restoration, and
from the spectral-function many-body treatment in which the approach to the
phase boundary is less explicit.</description><identifier>DOI: 10.48550/arxiv.nucl-ex/0506002</identifier><language>eng</language><subject>Physics - Nuclear Experiment</subject><creationdate>2005-06</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>228,230,780,885</link.rule.ids><linktorsrc>$$Uhttps://arxiv.org/abs/nucl-ex/0506002$$EView_record_in_Cornell_University$$FView_record_in_$$GCornell_University$$Hfree_for_read</linktorsrc><backlink>$$Uhttps://doi.org/10.1140/epjc/s2005-02272-3$$DView published paper (Access to full text may be restricted)$$Hfree_for_read</backlink><backlink>$$Uhttps://doi.org/10.48550/arXiv.nucl-ex/0506002$$DView paper in arXiv$$Hfree_for_read</backlink></links><search><creatorcontrib>Agakichiev, G</creatorcontrib><creatorcontrib>Appelshauser, H</creatorcontrib><creatorcontrib>Bielcikova, J</creatorcontrib><creatorcontrib>Baur, R</creatorcontrib><creatorcontrib>Braun-Munzinger, P</creatorcontrib><creatorcontrib>Cherlin, A</creatorcontrib><creatorcontrib>Damjanovic, S</creatorcontrib><creatorcontrib>Drees, A</creatorcontrib><creatorcontrib>Esumi, S</creatorcontrib><creatorcontrib>Faschingbauer, U</creatorcontrib><creatorcontrib>Fraenkel, Z</creatorcontrib><creatorcontrib>Fuchs, Ch</creatorcontrib><creatorcontrib>Gatti, E</creatorcontrib><creatorcontrib>Glassel, P</creatorcontrib><creatorcontrib>Hering, G</creatorcontrib><creatorcontrib>Heros, C. P. de los</creatorcontrib><creatorcontrib>Holl, P</creatorcontrib><creatorcontrib>Jung, Ch</creatorcontrib><creatorcontrib>Lenkeit, B</creatorcontrib><creatorcontrib>Marin, A</creatorcontrib><creatorcontrib>Messer, F</creatorcontrib><creatorcontrib>Messer, M</creatorcontrib><creatorcontrib>Miskowiec, D</creatorcontrib><creatorcontrib>Nix, O</creatorcontrib><creatorcontrib>Panebrattsev, Yu</creatorcontrib><creatorcontrib>Pfeiffer, A</creatorcontrib><creatorcontrib>Rak, J</creatorcontrib><creatorcontrib>Ravinovich, I</creatorcontrib><creatorcontrib>Razin, S</creatorcontrib><creatorcontrib>Rehak, P</creatorcontrib><creatorcontrib>RIchter, M</creatorcontrib><creatorcontrib>Sampietro, M</creatorcontrib><creatorcontrib>Sako, H</creatorcontrib><creatorcontrib>Saveljic, N</creatorcontrib><creatorcontrib>Schmitz, W</creatorcontrib><creatorcontrib>Schukraft, J</creatorcontrib><creatorcontrib>Seipp, W</creatorcontrib><creatorcontrib>Shimanskiy, S</creatorcontrib><creatorcontrib>Socol, E</creatorcontrib><creatorcontrib>Specht, H. J</creatorcontrib><creatorcontrib>Stachel, J</creatorcontrib><creatorcontrib>Tel-Zur, G</creatorcontrib><creatorcontrib>Tserruya, I</creatorcontrib><creatorcontrib>Ullrich, T</creatorcontrib><creatorcontrib>Voigt, C</creatorcontrib><creatorcontrib>Voloshin, S</creatorcontrib><creatorcontrib>Weber, C</creatorcontrib><creatorcontrib>Wessels, J. P</creatorcontrib><creatorcontrib>Wienold, T</creatorcontrib><creatorcontrib>Wurm, J. P</creatorcontrib><creatorcontrib>Yurevich, V</creatorcontrib><title>e+e--pair production in Pb-Au collisions at 158 GeV per nucleon</title><description>Eur.Phys.J.C41:475-513,2005 We present the combined results on electron-pair production in 158 GeV/n
{Pb-Au} ($\sqrt{s}$= 17.2 GeV) collisions taken at the CERN SPS in 1995 and
1996, and give a detailed account of the data analysis. The enhancement over
the reference of neutral meson decays amounts to a factor of 2.31$\pm0.19
(stat.)\pm0.55 (syst.)\pm0.69 (decays)$ for semi-central collisions (28%
$\sigma/\sigma_{geo}$) when yields are integrated over $m>$ 200 MeV/$c^2$ in
invariant mass. The measured yield, its stronger-than-linear scaling with
$N_{ch}$, and the dominance of low pair $p_t$ strongly suggest an
interpretation as {\it thermal radiation} from pion annihilation in the
hadronic fireball. The shape of the excess centring at $m\approx$ 500
MeV/$c^2$, however, cannot be described without strong medium modifications of
the $\rho$ meson. The results are put into perspective by comparison to
predictions from Brown-Rho scaling governed by chiral symmetry restoration, and
from the spectral-function many-body treatment in which the approach to the
phase boundary is less explicit.</description><subject>Physics - Nuclear Experiment</subject><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><sourceid>GOX</sourceid><recordid>eNpjYJAzNNAzsTA1NdBPLKrILNPLK03O0U2t0DcwNTAzMDDiZLBP1U7V1S1IzCxSKCjKTylNLsnMz1PIzFMISNJ1LFVIzs_JySwGChUrJJYoGJpaKLinhikUpBYpgExKzc_jYWBNS8wpTuWF0twMKm6uIc4eumD74guKMnMTiyrjQarjUyviofYaE6kMAPkHO98</recordid><startdate>20050601</startdate><enddate>20050601</enddate><creator>Agakichiev, G</creator><creator>Appelshauser, H</creator><creator>Bielcikova, J</creator><creator>Baur, R</creator><creator>Braun-Munzinger, P</creator><creator>Cherlin, A</creator><creator>Damjanovic, S</creator><creator>Drees, A</creator><creator>Esumi, S</creator><creator>Faschingbauer, U</creator><creator>Fraenkel, Z</creator><creator>Fuchs, Ch</creator><creator>Gatti, E</creator><creator>Glassel, P</creator><creator>Hering, G</creator><creator>Heros, C. 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P. de los</au><au>Holl, P</au><au>Jung, Ch</au><au>Lenkeit, B</au><au>Marin, A</au><au>Messer, F</au><au>Messer, M</au><au>Miskowiec, D</au><au>Nix, O</au><au>Panebrattsev, Yu</au><au>Pfeiffer, A</au><au>Rak, J</au><au>Ravinovich, I</au><au>Razin, S</au><au>Rehak, P</au><au>RIchter, M</au><au>Sampietro, M</au><au>Sako, H</au><au>Saveljic, N</au><au>Schmitz, W</au><au>Schukraft, J</au><au>Seipp, W</au><au>Shimanskiy, S</au><au>Socol, E</au><au>Specht, H. J</au><au>Stachel, J</au><au>Tel-Zur, G</au><au>Tserruya, I</au><au>Ullrich, T</au><au>Voigt, C</au><au>Voloshin, S</au><au>Weber, C</au><au>Wessels, J. P</au><au>Wienold, T</au><au>Wurm, J. P</au><au>Yurevich, V</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>e+e--pair production in Pb-Au collisions at 158 GeV per nucleon</atitle><date>2005-06-01</date><risdate>2005</risdate><abstract>Eur.Phys.J.C41:475-513,2005 We present the combined results on electron-pair production in 158 GeV/n
{Pb-Au} ($\sqrt{s}$= 17.2 GeV) collisions taken at the CERN SPS in 1995 and
1996, and give a detailed account of the data analysis. The enhancement over
the reference of neutral meson decays amounts to a factor of 2.31$\pm0.19
(stat.)\pm0.55 (syst.)\pm0.69 (decays)$ for semi-central collisions (28%
$\sigma/\sigma_{geo}$) when yields are integrated over $m>$ 200 MeV/$c^2$ in
invariant mass. The measured yield, its stronger-than-linear scaling with
$N_{ch}$, and the dominance of low pair $p_t$ strongly suggest an
interpretation as {\it thermal radiation} from pion annihilation in the
hadronic fireball. The shape of the excess centring at $m\approx$ 500
MeV/$c^2$, however, cannot be described without strong medium modifications of
the $\rho$ meson. The results are put into perspective by comparison to
predictions from Brown-Rho scaling governed by chiral symmetry restoration, and
from the spectral-function many-body treatment in which the approach to the
phase boundary is less explicit.</abstract><doi>10.48550/arxiv.nucl-ex/0506002</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Physics - Nuclear Experiment |
| title | e+e--pair production in Pb-Au collisions at 158 GeV per nucleon |
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