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First results on angular distributions of thermal dileptons in nuclear collisions
The NA60 experiment at the CERN SPS has studied dimuon production in 158A GeV In-In collisions. The strong excess of pairs above the known sources found in the complete mass region 0.2<M<2.6 GeV has previously been interpreted as thermal radiation. We now present first results on the associate...
| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
2008
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1103/PhysRevLett.102.222301 http://cds.cern.ch/record/1151946 |
| _version_ | 1780915679842533376 |
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| author | Arnaldi, R Banicz, K Castor, J Chaurand, B 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 R Heuser, J M Keil, M Kluberg, L 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 |
| author_facet | Arnaldi, R Banicz, K Castor, J Chaurand, B 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 R Heuser, J M Keil, M Kluberg, L 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 |
| author_sort | Arnaldi, R |
| collection | CERN |
| description | The NA60 experiment at the CERN SPS has studied dimuon production in 158A GeV In-In collisions. The strong excess of pairs above the known sources found in the complete mass region 0.2<M<2.6 GeV has previously been interpreted as thermal radiation. We now present first results on the associated angular distributions. Using the Collins-Soper reference frame, the structure function parameters \lambda, \mu and \nu are measured to be zero, and the projected distributions in polar and azimuth angles are found to be uniform. The absence of any polarization is consistent with the interpretation of the excess dimuons as thermal radiation from a randomized system. |
| id | cern-1151946 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2008 |
| record_format | invenio |
| spelling | cern-11519462019-09-30T06:29:59Zdoi:10.1103/PhysRevLett.102.222301http://cds.cern.ch/record/1151946engArnaldi, RBanicz, KCastor, JChaurand, BCicalò, CColla, ACortese, PDamjanovic, SDavid, ADe Falco, ADevaux, ADucroux, LEn'yo, HFargeix, JFerretti, AFloris, MFörster, AForce, PGuettet, NGuichard, AGulkanian, H RHeuser, J MKeil, MKluberg, LLourenço, CLozano, JManso, FMartins, PMasoni, ANeves, AOhnishi, HOppedisano, CParracho, PPillot, PPoghosyan, TPuddu, GRadermacher, ERamalhete, PRosinsky, PScomparin, ESeixas, JSerci, SShahoyan, RSonderegger, PSpecht, H JTieulent, RUsai, GVeenhof, RWöhri, H KFirst results on angular distributions of thermal dileptons in nuclear collisionsNuclear Physics - ExperimentThe NA60 experiment at the CERN SPS has studied dimuon production in 158A GeV In-In collisions. The strong excess of pairs above the known sources found in the complete mass region 0.2<M<2.6 GeV has previously been interpreted as thermal radiation. We now present first results on the associated angular distributions. Using the Collins-Soper reference frame, the structure function parameters \lambda, \mu and \nu are measured to be zero, and the projected distributions in polar and azimuth angles are found to be uniform. The absence of any polarization is consistent with the interpretation of the excess dimuons as thermal radiation from a randomized system.arXiv:0812.3100oai:cds.cern.ch:11519462008-12-17 |
| spellingShingle | Nuclear Physics - Experiment Arnaldi, R Banicz, K Castor, J Chaurand, B 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 R Heuser, J M Keil, M Kluberg, L 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 First results on angular distributions of thermal dileptons in nuclear collisions |
| title | First results on angular distributions of thermal dileptons in nuclear collisions |
| title_full | First results on angular distributions of thermal dileptons in nuclear collisions |
| title_fullStr | First results on angular distributions of thermal dileptons in nuclear collisions |
| title_full_unstemmed | First results on angular distributions of thermal dileptons in nuclear collisions |
| title_short | First results on angular distributions of thermal dileptons in nuclear collisions |
| title_sort | first results on angular distributions of thermal dileptons in nuclear collisions |
| topic | Nuclear Physics - Experiment |
| url | https://dx.doi.org/10.1103/PhysRevLett.102.222301 http://cds.cern.ch/record/1151946 |
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