NA60 results on thermal dimuons
The NA60 experiment at the CERN SPS has measured muon pairs with unprecedented precision in 158 A GeV In–In collisions. A strong excess of pairs above the known sources is observed in the whole mass region 0.2< M
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| Veröffentlicht in: | European Physical Journal C 2009-06, Vol.61 (4), p.711-720 |
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| creator | Arnaldi, R. Banicz, K. Borer, K. Castor, J. Chaurand, B. Chen, W. Cicalò, C. Colla, A. Cortese, P. Damjanovic, S. David, A. de Falco, A. Devaux, A. Ducroux, L. En’yo, H. Fargeix, J. Ferretti, A. Floris, M. Förster, A. Force, P. Guettet, N. Guichard, A. Gulkanian, H. Heuser, J. M. Keil, M. Kluberg, L. Li, Z. Lourenço, C. Lozano, J. Manso, F. Martins, P. Masoni, A. Neves, A. Ohnishi, H. Oppedisano, C. Parracho, P. Pillot, P. Poghosyan, T. Puddu, G. Radermacher, E. Ramalhete, P. Rosinsky, P. Scomparin, E. Seixas, J. Serci, S. Shahoyan, R. Sonderegger, P. Specht, H. J. Tieulent, R. Usai, G. Veenhof, R. Wöhri, H. K. |
| description | The NA60 experiment at the CERN SPS has measured muon pairs with unprecedented precision in 158
A
GeV In–In collisions. A strong excess of pairs above the known sources is observed in the whole mass region 0.2<
M |
| doi_str_mv | 10.1140/epjc/s10052-009-0878-5 |
| format | Article |
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A
GeV In–In collisions. A strong excess of pairs above the known sources is observed in the whole mass region 0.2<
M
<2.6 GeV. The mass spectrum for
M
<1 GeV is consistent with a dominant contribution from
π
+
π
−
→
ρ
→
μ
+
μ
−
annihilation. The associated
ρ
spectral function shows a strong broadening, but essentially no shift in mass. For
M
>1 GeV, the excess is found to be prompt, not due to enhanced charm production, with pronounced differences to Drell–Yan pairs. The slope parameter
T
eff
associated with the transverse momentum spectra rises with mass up to the
ρ
, followed by a sudden decline above. The rise for
M
<1 GeV is consistent with radial flow of a hadronic emission source. The seeming absence of significant flow for
M
>1 GeV and its relation to parton–hadron duality is discussed in detail, suggesting a dominantly partonic emission source in this region. A comparison of the data to the present status of theoretical modeling is also contained. The accumulated empirical evidence, including also a Planck-like shape of the mass spectra at low
p
T
and the lack of polarization, is consistent with a global interpretation of the excess dimuons as thermal radiation. We conclude with first results on
ω
in-medium effects.</description><identifier>ISSN: 1434-6044</identifier><identifier>EISSN: 1434-6052</identifier><identifier>DOI: 10.1140/epjc/s10052-009-0878-5</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer-Verlag</publisher><subject>Astronomy ; Astrophysics and Cosmology ; Elementary Particles ; Emission ; Exact sciences and technology ; Hadrons ; Heavy Ions ; Mass spectra ; Measurement Science and Instrumentation ; Nuclear Energy ; Nuclear Experiment ; Nuclear Physics ; Partons ; Physics ; Physics and Astronomy ; Quantum Field Theories ; Quantum Field Theory ; Radial flow ; Regular Article - Experimental Physics ; String Theory ; Synchrotrons ; The physics of elementary particles and fields ; Thermal radiation ; Transverse momentum</subject><ispartof>European Physical Journal C, 2009-06, Vol.61 (4), p.711-720</ispartof><rights>Springer-Verlag / Società Italiana di Fisica 2009</rights><rights>2009 INIST-CNRS</rights><rights>The European Physical Journal C is a copyright of Springer, (2009). All Rights Reserved.</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c481t-600593ccbd7e410968da462f657f00c6bc73041342f7a039467f357a59d051153</citedby><cites>FETCH-LOGICAL-c481t-600593ccbd7e410968da462f657f00c6bc73041342f7a039467f357a59d051153</cites><orcidid>0000-0001-9497-4890 ; 0000-0002-9067-0803</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1140/epjc/s10052-009-0878-5$$EPDF$$P50$$Gspringer$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://doi.org/10.1140/epjc/s10052-009-0878-5$$EHTML$$P50$$Gspringer$$Hfree_for_read</linktohtml><link.rule.ids>309,310,314,776,780,785,786,881,23909,23910,25118,27901,27902,41096,41464,42165,42533,51294,51551</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=21924073$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://in2p3.hal.science/in2p3-00373113$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Arnaldi, R.</creatorcontrib><creatorcontrib>Banicz, K.</creatorcontrib><creatorcontrib>Borer, K.</creatorcontrib><creatorcontrib>Castor, J.</creatorcontrib><creatorcontrib>Chaurand, B.</creatorcontrib><creatorcontrib>Chen, W.</creatorcontrib><creatorcontrib>Cicalò, C.</creatorcontrib><creatorcontrib>Colla, A.</creatorcontrib><creatorcontrib>Cortese, P.</creatorcontrib><creatorcontrib>Damjanovic, S.</creatorcontrib><creatorcontrib>David, A.</creatorcontrib><creatorcontrib>de Falco, A.</creatorcontrib><creatorcontrib>Devaux, A.</creatorcontrib><creatorcontrib>Ducroux, L.</creatorcontrib><creatorcontrib>En’yo, H.</creatorcontrib><creatorcontrib>Fargeix, J.</creatorcontrib><creatorcontrib>Ferretti, A.</creatorcontrib><creatorcontrib>Floris, M.</creatorcontrib><creatorcontrib>Förster, A.</creatorcontrib><creatorcontrib>Force, P.</creatorcontrib><creatorcontrib>Guettet, N.</creatorcontrib><creatorcontrib>Guichard, A.</creatorcontrib><creatorcontrib>Gulkanian, H.</creatorcontrib><creatorcontrib>Heuser, J. M.</creatorcontrib><creatorcontrib>Keil, M.</creatorcontrib><creatorcontrib>Kluberg, L.</creatorcontrib><creatorcontrib>Li, Z.</creatorcontrib><creatorcontrib>Lourenço, C.</creatorcontrib><creatorcontrib>Lozano, J.</creatorcontrib><creatorcontrib>Manso, F.</creatorcontrib><creatorcontrib>Martins, P.</creatorcontrib><creatorcontrib>Masoni, A.</creatorcontrib><creatorcontrib>Neves, A.</creatorcontrib><creatorcontrib>Ohnishi, H.</creatorcontrib><creatorcontrib>Oppedisano, C.</creatorcontrib><creatorcontrib>Parracho, P.</creatorcontrib><creatorcontrib>Pillot, P.</creatorcontrib><creatorcontrib>Poghosyan, T.</creatorcontrib><creatorcontrib>Puddu, G.</creatorcontrib><creatorcontrib>Radermacher, E.</creatorcontrib><creatorcontrib>Ramalhete, P.</creatorcontrib><creatorcontrib>Rosinsky, P.</creatorcontrib><creatorcontrib>Scomparin, E.</creatorcontrib><creatorcontrib>Seixas, J.</creatorcontrib><creatorcontrib>Serci, S.</creatorcontrib><creatorcontrib>Shahoyan, R.</creatorcontrib><creatorcontrib>Sonderegger, P.</creatorcontrib><creatorcontrib>Specht, H. J.</creatorcontrib><creatorcontrib>Tieulent, R.</creatorcontrib><creatorcontrib>Usai, G.</creatorcontrib><creatorcontrib>Veenhof, R.</creatorcontrib><creatorcontrib>Wöhri, H. K.</creatorcontrib><creatorcontrib>NA60 Collaboration</creatorcontrib><title>NA60 results on thermal dimuons</title><title>European Physical Journal C</title><addtitle>Eur. Phys. J. C</addtitle><description>The NA60 experiment at the CERN SPS has measured muon pairs with unprecedented precision in 158
A
GeV In–In collisions. A strong excess of pairs above the known sources is observed in the whole mass region 0.2<
M
<2.6 GeV. The mass spectrum for
M
<1 GeV is consistent with a dominant contribution from
π
+
π
−
→
ρ
→
μ
+
μ
−
annihilation. The associated
ρ
spectral function shows a strong broadening, but essentially no shift in mass. For
M
>1 GeV, the excess is found to be prompt, not due to enhanced charm production, with pronounced differences to Drell–Yan pairs. The slope parameter
T
eff
associated with the transverse momentum spectra rises with mass up to the
ρ
, followed by a sudden decline above. The rise for
M
<1 GeV is consistent with radial flow of a hadronic emission source. The seeming absence of significant flow for
M
>1 GeV and its relation to parton–hadron duality is discussed in detail, suggesting a dominantly partonic emission source in this region. A comparison of the data to the present status of theoretical modeling is also contained. The accumulated empirical evidence, including also a Planck-like shape of the mass spectra at low
p
T
and the lack of polarization, is consistent with a global interpretation of the excess dimuons as thermal radiation. We conclude with first results on
ω
in-medium effects.</description><subject>Astronomy</subject><subject>Astrophysics and Cosmology</subject><subject>Elementary Particles</subject><subject>Emission</subject><subject>Exact sciences and technology</subject><subject>Hadrons</subject><subject>Heavy Ions</subject><subject>Mass spectra</subject><subject>Measurement Science and Instrumentation</subject><subject>Nuclear Energy</subject><subject>Nuclear Experiment</subject><subject>Nuclear Physics</subject><subject>Partons</subject><subject>Physics</subject><subject>Physics and Astronomy</subject><subject>Quantum Field Theories</subject><subject>Quantum Field Theory</subject><subject>Radial flow</subject><subject>Regular Article - Experimental Physics</subject><subject>String Theory</subject><subject>Synchrotrons</subject><subject>The physics of elementary particles and fields</subject><subject>Thermal radiation</subject><subject>Transverse momentum</subject><issn>1434-6044</issn><issn>1434-6052</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid>C6C</sourceid><sourceid>BENPR</sourceid><recordid>eNqFkF1LwzAUhoMoOKd_QQvildSdfDeXY6gTit7odcjS1HV0bU1awX9vSse89Coh58lzXl6ErjE8YMxg4bqdXQQMwEkKoFLIZJbyEzTDjLJUxOfT452xc3QRwg4ACINshm5elwIS78JQ9yFpm6TfOr83dVJU-6FtwiU6K00d3NXhnKOPp8f31TrN355fVss8tSzDfTQDV9TaTSEdw6BEVhgmSCm4LAGs2FhJgWHKSCkNUMWELCmXhqsCOMacztH95N2aWne-2hv_o1tT6fUy11VDOqoBqKQY028c6duJ7nz7NbjQ6107-CYG1IQoBkQRRSMlJsr6NgTvyqMYgx6r02N1eqou6pUeq9NjmLuD3gRr6tKbxlbh-JtgFcuT4wI5cSGOmk_n_2L8s-EXS8J8qQ</recordid><startdate>20090601</startdate><enddate>20090601</enddate><creator>Arnaldi, R.</creator><creator>Banicz, K.</creator><creator>Borer, K.</creator><creator>Castor, J.</creator><creator>Chaurand, B.</creator><creator>Chen, W.</creator><creator>Cicalò, C.</creator><creator>Colla, A.</creator><creator>Cortese, P.</creator><creator>Damjanovic, S.</creator><creator>David, A.</creator><creator>de Falco, A.</creator><creator>Devaux, A.</creator><creator>Ducroux, L.</creator><creator>En’yo, H.</creator><creator>Fargeix, J.</creator><creator>Ferretti, A.</creator><creator>Floris, M.</creator><creator>Förster, A.</creator><creator>Force, P.</creator><creator>Guettet, N.</creator><creator>Guichard, A.</creator><creator>Gulkanian, H.</creator><creator>Heuser, J. 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M. ; Keil, M. ; Kluberg, L. ; Li, Z. ; Lourenço, C. ; Lozano, J. ; Manso, F. ; Martins, P. ; Masoni, A. ; Neves, A. ; Ohnishi, H. ; Oppedisano, C. ; Parracho, P. ; Pillot, P. ; Poghosyan, T. ; Puddu, G. ; Radermacher, E. ; Ramalhete, P. ; Rosinsky, P. ; Scomparin, E. ; Seixas, J. ; Serci, S. ; Shahoyan, R. ; Sonderegger, P. ; Specht, H. J. ; Tieulent, R. ; Usai, G. ; Veenhof, R. ; Wöhri, H. 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K.</creatorcontrib><creatorcontrib>NA60 Collaboration</creatorcontrib><collection>Springer Nature OA Free Journals</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>Advanced Technologies & Aerospace Collection</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>Aerospace Database</collection><collection>SciTech Premium Collection</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Advanced Technologies & Aerospace Database</collection><collection>ProQuest Advanced Technologies & Aerospace Collection</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Hyper Article en Ligne (HAL)</collection><jtitle>European Physical Journal C</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Arnaldi, R.</au><au>Banicz, K.</au><au>Borer, K.</au><au>Castor, J.</au><au>Chaurand, B.</au><au>Chen, W.</au><au>Cicalò, C.</au><au>Colla, A.</au><au>Cortese, P.</au><au>Damjanovic, S.</au><au>David, A.</au><au>de Falco, A.</au><au>Devaux, A.</au><au>Ducroux, L.</au><au>En’yo, H.</au><au>Fargeix, J.</au><au>Ferretti, A.</au><au>Floris, M.</au><au>Förster, A.</au><au>Force, P.</au><au>Guettet, N.</au><au>Guichard, A.</au><au>Gulkanian, H.</au><au>Heuser, J. M.</au><au>Keil, M.</au><au>Kluberg, L.</au><au>Li, Z.</au><au>Lourenço, C.</au><au>Lozano, J.</au><au>Manso, F.</au><au>Martins, P.</au><au>Masoni, A.</au><au>Neves, A.</au><au>Ohnishi, H.</au><au>Oppedisano, C.</au><au>Parracho, P.</au><au>Pillot, P.</au><au>Poghosyan, T.</au><au>Puddu, G.</au><au>Radermacher, E.</au><au>Ramalhete, P.</au><au>Rosinsky, P.</au><au>Scomparin, E.</au><au>Seixas, J.</au><au>Serci, S.</au><au>Shahoyan, R.</au><au>Sonderegger, P.</au><au>Specht, H. J.</au><au>Tieulent, R.</au><au>Usai, G.</au><au>Veenhof, R.</au><au>Wöhri, H. K.</au><aucorp>NA60 Collaboration</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>NA60 results on thermal dimuons</atitle><jtitle>European Physical Journal C</jtitle><stitle>Eur. Phys. J. C</stitle><date>2009-06-01</date><risdate>2009</risdate><volume>61</volume><issue>4</issue><spage>711</spage><epage>720</epage><pages>711-720</pages><issn>1434-6044</issn><eissn>1434-6052</eissn><abstract>The NA60 experiment at the CERN SPS has measured muon pairs with unprecedented precision in 158
A
GeV In–In collisions. A strong excess of pairs above the known sources is observed in the whole mass region 0.2<
M
<2.6 GeV. The mass spectrum for
M
<1 GeV is consistent with a dominant contribution from
π
+
π
−
→
ρ
→
μ
+
μ
−
annihilation. The associated
ρ
spectral function shows a strong broadening, but essentially no shift in mass. For
M
>1 GeV, the excess is found to be prompt, not due to enhanced charm production, with pronounced differences to Drell–Yan pairs. The slope parameter
T
eff
associated with the transverse momentum spectra rises with mass up to the
ρ
, followed by a sudden decline above. The rise for
M
<1 GeV is consistent with radial flow of a hadronic emission source. The seeming absence of significant flow for
M
>1 GeV and its relation to parton–hadron duality is discussed in detail, suggesting a dominantly partonic emission source in this region. A comparison of the data to the present status of theoretical modeling is also contained. The accumulated empirical evidence, including also a Planck-like shape of the mass spectra at low
p
T
and the lack of polarization, is consistent with a global interpretation of the excess dimuons as thermal radiation. We conclude with first results on
ω
in-medium effects.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer-Verlag</pub><doi>10.1140/epjc/s10052-009-0878-5</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0001-9497-4890</orcidid><orcidid>https://orcid.org/0000-0002-9067-0803</orcidid><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 1434-6044 |
| ispartof | European Physical Journal C, 2009-06, Vol.61 (4), p.711-720 |
| issn | 1434-6044 1434-6052 |
| language | eng |
| recordid | cdi_proquest_journals_2294029293 |
| source | Springer Nature - Complete Springer Journals; Springer Nature OA Free Journals |
| subjects | Astronomy Astrophysics and Cosmology Elementary Particles Emission Exact sciences and technology Hadrons Heavy Ions Mass spectra Measurement Science and Instrumentation Nuclear Energy Nuclear Experiment Nuclear Physics Partons Physics Physics and Astronomy Quantum Field Theories Quantum Field Theory Radial flow Regular Article - Experimental Physics String Theory Synchrotrons The physics of elementary particles and fields Thermal radiation Transverse momentum |
| title | NA60 results on thermal dimuons |
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