First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions

We report on a precision measurement of low-mass muon pairs in 158 AGeV indium-indium collisions at the CERN SPS. A significant excess of pairs is observed above the yield expected from neutral meson decays. The unprecedented sample size of 360 000 dimuons and the good mass resolution of about 2% al...

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Detalles Bibliográficos
Autores principales: Arnaldi, R., Averbeck, R., Banicz, K., Castor, J., Chaurand, B., Cicalo, C., Colla, A., Cortese, P., Damjanovic, S., David, Andre, De Falco, A., Devaux, A., Drees, A., Ducroux, L., Enyo, H., Fargeix, J., Ferretti, A., Floris, M., Forster, A., Force, P., Guettet, N., Guichard, A., Gulkanian, H., Heuser, J.M., Keil, M., Kluberg, L., Lourenco, C., Lozano, J., Manso, F., Masoni, A., Martins, P., Neves, A., Ohnishi, H., Oppedisano, C., Parracho, P., Pillot, Ph., 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., Wohri, H.K.
Lenguaje:eng
Publicado: 2006
Materias:
Nuclear Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.96.162302
http://cds.cern.ch/record/947619
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author Arnaldi, R.
Averbeck, R.
Banicz, K.
Castor, J.
Chaurand, B.
Cicalo, C.
Colla, A.
Cortese, P.
Damjanovic, S.
David, Andre
De Falco, A.
Devaux, A.
Drees, A.
Ducroux, L.
Enyo, H.
Fargeix, J.
Ferretti, A.
Floris, M.
Forster, A.
Force, P.
Guettet, N.
Guichard, A.
Gulkanian, H.
Heuser, J.M.
Keil, M.
Kluberg, L.
Lourenco, C.
Lozano, J.
Manso, F.
Masoni, A.
Martins, P.
Neves, A.
Ohnishi, H.
Oppedisano, C.
Parracho, P.
Pillot, Ph.
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.
Wohri, H.K.
author_facet Arnaldi, R.
Averbeck, R.
Banicz, K.
Castor, J.
Chaurand, B.
Cicalo, C.
Colla, A.
Cortese, P.
Damjanovic, S.
David, Andre
De Falco, A.
Devaux, A.
Drees, A.
Ducroux, L.
Enyo, H.
Fargeix, J.
Ferretti, A.
Floris, M.
Forster, A.
Force, P.
Guettet, N.
Guichard, A.
Gulkanian, H.
Heuser, J.M.
Keil, M.
Kluberg, L.
Lourenco, C.
Lozano, J.
Manso, F.
Masoni, A.
Martins, P.
Neves, A.
Ohnishi, H.
Oppedisano, C.
Parracho, P.
Pillot, Ph.
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.
Wohri, H.K.
author_sort Arnaldi, R.
collection CERN
description We report on a precision measurement of low-mass muon pairs in 158 AGeV indium-indium collisions at the CERN SPS. A significant excess of pairs is observed above the yield expected from neutral meson decays. The unprecedented sample size of 360 000 dimuons and the good mass resolution of about 2% allow us to isolate the excess by subtraction of the decay sources. The shape of the resulting mass spectrum is consistent with a dominant contribution from pi+pi-->rho-->mu+mu- annihilation. The associated space-time averaged rho spectral function shows a strong broadening, but essentially no shift in mass. This may rule out theoretical models linking hadron masses
id cern-947619
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2006
record_format invenio
spelling cern-9476192023-03-14T17:16:27Zdoi:10.1103/PhysRevLett.96.162302http://cds.cern.ch/record/947619engArnaldi, R.Averbeck, R.Banicz, K.Castor, J.Chaurand, B.Cicalo, C.Colla, A.Cortese, P.Damjanovic, S.David, AndreDe Falco, A.Devaux, A.Drees, A.Ducroux, L.Enyo, H.Fargeix, J.Ferretti, A.Floris, M.Forster, A.Force, P.Guettet, N.Guichard, A.Gulkanian, H.Heuser, J.M.Keil, M.Kluberg, L.Lourenco, C.Lozano, J.Manso, F.Masoni, A.Martins, P.Neves, A.Ohnishi, H.Oppedisano, C.Parracho, P.Pillot, Ph.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.Wohri, H.K.First Measurement of the rho Spectral Function in High-Energy Nuclear CollisionsNuclear Physics - ExperimentWe report on a precision measurement of low-mass muon pairs in 158 AGeV indium-indium collisions at the CERN SPS. A significant excess of pairs is observed above the yield expected from neutral meson decays. The unprecedented sample size of 360 000 dimuons and the good mass resolution of about 2% allow us to isolate the excess by subtraction of the decay sources. The shape of the resulting mass spectrum is consistent with a dominant contribution from pi+pi-->rho-->mu+mu- annihilation. The associated space-time averaged rho spectral function shows a strong broadening, but essentially no shift in mass. This may rule out theoretical models linking hadron massesWe report on a precision measurement of low-mass muon pairs in 158 AGeV indium-indium collisions at the CERN SPS. A significant excess of pairs is observed above the yield expected from neutral meson decays. The unprecedented sample size of 360 000 dimuons and the good mass resolution of about 2% allow us to isolate the excess by subtraction of the decay sources. The shape of the resulting mass spectrum is consistent with a dominant contribution from pi+pi-->rho-->mu+mu- annihilation. The associated space-time averaged rho spectral function shows a strong broadening, but essentially no shift in mass. This may rule out theoretical models linking hadron massesnucl-ex/0605007oai:cds.cern.ch:9476192006-05-10
spellingShingle Nuclear Physics - Experiment
Arnaldi, R.
Averbeck, R.
Banicz, K.
Castor, J.
Chaurand, B.
Cicalo, C.
Colla, A.
Cortese, P.
Damjanovic, S.
David, Andre
De Falco, A.
Devaux, A.
Drees, A.
Ducroux, L.
Enyo, H.
Fargeix, J.
Ferretti, A.
Floris, M.
Forster, A.
Force, P.
Guettet, N.
Guichard, A.
Gulkanian, H.
Heuser, J.M.
Keil, M.
Kluberg, L.
Lourenco, C.
Lozano, J.
Manso, F.
Masoni, A.
Martins, P.
Neves, A.
Ohnishi, H.
Oppedisano, C.
Parracho, P.
Pillot, Ph.
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.
Wohri, H.K.
First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
title First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
title_full First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
title_fullStr First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
title_full_unstemmed First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
title_short First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
title_sort first measurement of the rho spectral function in high-energy nuclear collisions
topic Nuclear Physics - Experiment
url https://dx.doi.org/10.1103/PhysRevLett.96.162302
http://cds.cern.ch/record/947619
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