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Arnaldi R, Averbeck R, Banicz K, et al. First measurement of the rho spectral function in high-energy nuclear collisions. Phys Rev Lett. 2006;96(16):162302doi: 10.1103/PhysRevLett.96.162302.
Arnaldi, R., Averbeck, R., Banicz, K., Castor, J., Chaurand, B., Cicalò, C., Colla, A., Cortese, P., Damjanovic, S., David, A., De Falco, A., Devaux, A., Drees, 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., Lourenço, C., Lozano, J., Manso, F., Masoni, A., Martins, P., Neves, A., Ohnishi, H., Oppedisano, C., Parracho, P., Pillot, P., 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. (2006). First measurement of the rho spectral function in high-energy nuclear collisions. Physical review letters, 96(16), 162302. https://doi.org/10.1103/PhysRevLett.96.162302
Arnaldi, R, et al. "First measurement of the rho spectral function in high-energy nuclear collisions." Physical review letters vol. 96,16 (2006): 162302. doi: https://doi.org/10.1103/PhysRevLett.96.162302
Arnaldi R, Averbeck R, Banicz K, Castor J, Chaurand B, Cicalò C, Colla A, Cortese P, Damjanovic S, David A, De Falco A, Devaux A, Drees A, Ducroux L, En'yo H, Fargeix J, Ferretti A, Floris M, Förster A, Force P, Guettet N, Guichard A, Gulkanian H, Heuser JM, Keil M, Kluberg L, Lourenço C, Lozano J, Manso F, Masoni A, Martins P, Neves A, Ohnishi H, Oppedisano C, Parracho P, Pillot P, Puddu G, Radermacher E, Ramalhete P, Rosinsky P, Scomparin E, Seixas J, Serci S, Shahoyan R, Sonderegger P, Specht HJ, Tieulent R, Usai G, Veenhof R, Wöhri HK. First measurement of the rho spectral function in high-energy nuclear collisions. Phys Rev Lett. 2006 Apr 28;96(16):162302. doi: 10.1103/PhysRevLett.96.162302. Epub 2006 Apr 27. PMID: 16712218.
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Phys Rev Lett. 2006 Apr 28;96(16):162302. doi: 10.1103/PhysRevLett.96.162302. Epub 2006 Apr 27.

First measurement of the rho spectral function in high-energy nuclear collisions.

Physical review letters

R Arnaldi, R Averbeck, K Banicz, J Castor, B Chaurand, C Cicalò, A Colla, P Cortese, S Damjanovic, A David, A De Falco, A Devaux, A Drees, L Ducroux, H En'yo, J Fargeix, A Ferretti, M Floris, A Förster, P Force, N Guettet, A Guichard, H Gulkanian, J M Heuser, M Keil, L Kluberg, C Lourenço, J Lozano, F Manso, A Masoni, P Martins, A Neves, H Ohnishi, C Oppedisano, P Parracho, Ph Pillot, G Puddu, E Radermacher, P Ramalhete, P Rosinsky, E Scomparin, J Seixas, S Serci, R Shahoyan, P Sonderegger, H J Specht, R Tieulent, G Usai, R Veenhof, H K Wöhri,

Affiliations

  1. Università di Torino and INFN, Turin, Italy.

PMID: 16712218 DOI: 10.1103/PhysRevLett.96.162302

Abstract

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 spectral function shows a strong broadening, but essentially no shift in mass. This may rule out theoretical models linking hadron masses directly to the chiral condensate.

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