Thermal Dimuon Emission in In-In at the CERN SPS

The NA60 experiment at the CERN SPS has studied low-mass dimuon production in 158A GeV In-In collisions. A significant excess of pairs is observed above the yield expected from neutral meson decays, consistent with a dominant contribution from $\pi\pi\to\rho\to\mu\mu$. This paper presents precision...

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Autores principales: 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., Farjeix, J., Ferretti, A., Floris, M., Förster, A., Force, P., Guettet, N., Guichard, A., Gulkanyan, H., Heuser, J., 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.
Lenguaje:eng
Publicado: The Gioi 2008
Materias:
Nuclear Physics - Experiment
Acceso en línea:http://cds.cern.ch/record/1107769
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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.
Farjeix, J.
Ferretti, A.
Floris, M.
Förster, A.
Force, P.
Guettet, N.
Guichard, A.
Gulkanyan, H.
Heuser, J.
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.
Farjeix, J.
Ferretti, A.
Floris, M.
Förster, A.
Force, P.
Guettet, N.
Guichard, A.
Gulkanyan, H.
Heuser, J.
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 low-mass dimuon production in 158A GeV In-In collisions. A significant excess of pairs is observed above the yield expected from neutral meson decays, consistent with a dominant contribution from $\pi\pi\to\rho\to\mu\mu$. This paper presents precision results on the mass and transverse momentum spectra of the excess pairs. The space-time averaged rho spectral function associated to the measured mass distribution shows a significant broadening, but essentially no mass shift. The slope parameter $T_{eff}$ extracted from the spectra rises with dimuon mass up to the $\rho$, followed by a sudden decline above. While the initial rise is consistent with the expectations for radial flow of a hadronic decay source, the decline indicates a transition to an emission source with much smaller flow, possibly of partonic origin.
id cern-1107769
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2008
publisher The Gioi
record_format invenio
spelling cern-11077692023-03-14T18:31:34Zhttp://cds.cern.ch/record/1107769engArnaldi, 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.Farjeix, J.Ferretti, A.Floris, M.Förster, A.Force, P.Guettet, N.Guichard, A.Gulkanyan, H.Heuser, J.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.Thermal Dimuon Emission in In-In at the CERN SPSNuclear Physics - ExperimentThe NA60 experiment at the CERN SPS has studied low-mass dimuon production in 158A GeV In-In collisions. A significant excess of pairs is observed above the yield expected from neutral meson decays, consistent with a dominant contribution from $\pi\pi\to\rho\to\mu\mu$. This paper presents precision results on the mass and transverse momentum spectra of the excess pairs. The space-time averaged rho spectral function associated to the measured mass distribution shows a significant broadening, but essentially no mass shift. The slope parameter $T_{eff}$ extracted from the spectra rises with dimuon mass up to the $\rho$, followed by a sudden decline above. While the initial rise is consistent with the expectations for radial flow of a hadronic decay source, the decline indicates a transition to an emission source with much smaller flow, possibly of partonic origin.The NA60 experiment at the CERN SPS has studied low-mass dimuon production in 158A GeV In-In collisions. A significant excess of pairs is observed above the yield expected from neutral meson decays, consistent with a dominant contribution from $\pi$ $\pi$ $\to$ $\rho$ $\to$ $\mu$ $\mu$.This paper presents precision results on the mass and transverse momentum spectra of the excess pairs. The space-time averaged rho spectral function associated to the measured mass distribution shows a significant broadening, but essentially no mass shift. The slope parameter $T_{eff}$ extracted from the spectra rises with dimuon mass up to the $\rho$ , followed by a sudden decline above. While the initial rise is consistent with the expectations for radial flow of a hadronic decay source, the decline indicates a transition to an emission source with much smaller flow , possibly of partonic origin.The GioiarXiv:0806.0577oai:cds.cern.ch:11077692008-06-04
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.
Farjeix, J.
Ferretti, A.
Floris, M.
Förster, A.
Force, P.
Guettet, N.
Guichard, A.
Gulkanyan, H.
Heuser, J.
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.
Thermal Dimuon Emission in In-In at the CERN SPS
title Thermal Dimuon Emission in In-In at the CERN SPS
title_full Thermal Dimuon Emission in In-In at the CERN SPS
title_fullStr Thermal Dimuon Emission in In-In at the CERN SPS
title_full_unstemmed Thermal Dimuon Emission in In-In at the CERN SPS
title_short Thermal Dimuon Emission in In-In at the CERN SPS
title_sort thermal dimuon emission in in-in at the cern sps
topic Nuclear Physics - Experiment
url http://cds.cern.ch/record/1107769
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