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

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; Philippe 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

doi:10.1103/PhysRevLett.96.162302

Journal Articles Physical Review Letters Year : 2006

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

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R. Arnaldi

Function : Author

R. Averbeck

Function : Author

K. Banicz

Function : Author

J. Castor

Function : Author

Laboratoire de Physique Corpusculaire - Clermont-Ferrand

B. Chaurand

Function : Author

Laboratoire Leprince-Ringuet

C. Cicalò

Function : Author

A. Colla

Function : Author

P. Cortese

Function : Author

S. Damjanovic

Function : Author

A. David

Function : Author

A. de Falco

Function : Author

A. Devaux

Function : Author

Laboratoire de Physique Corpusculaire - Clermont-Ferrand

A. Drees

Function : Author

L. Ducroux

Function : Author

Institut de Physique Nucléaire de Lyon

H. En'Yo

Function : Author

J. Fargeix

Function : Author

Laboratoire de Physique Corpusculaire - Clermont-Ferrand

A. Ferretti

Function : Author

M. Floris

Function : Author

A. Förster

Function : Author

P. Force

Function : Author

Laboratoire de Physique Corpusculaire - Clermont-Ferrand

N. Guettet

Function : Author

Laboratoire de Physique Corpusculaire - Clermont-Ferrand

A. Guichard

Function : Author

Institut de Physique Nucléaire de Lyon

H. Gulkanian

Function : Author

J.-M. Heuser

Function : Author

M. Keil

Function : Author

L. Kluberg

Function : Author

Laboratoire Leprince-Ringuet

C. Lourenço

Function : Author

J. Lozano

Function : Author

F. Manso

Function : Author

Laboratoire de Physique Corpusculaire - Clermont-Ferrand

A. Masoni

Function : Author

P. Martins

Function : Author
PersonId : 878076
IdHAL : martins-philippe
ORCID : 0000-0001-9497-4890

A. Neves

Function : Author

H. Ohnishi

Function : Author

C. Oppedisano

Function : Author

P. Parracho

Function : Author

Philippe Pillot

Function : Author
PersonId : 175815
IdHAL : ppillot
ORCID : 0000-0002-9067-0803

Institut de Physique Nucléaire de Lyon

G. Puddu

Function : Author

E. Radermacher

Function : Author

P. Ramalhete

Function : Author

P. Rosinsky

Function : Author

E. Scomparin

Function : Author

J. Seixas

Function : Author

S. Serci

Function : Author

R. Shahoyan

Function : Author

P. Sonderegger

Function : Author

H. J. Specht

Function : Author

R. Tieulent

Function : Author

Institut de Physique Nucléaire de Lyon

G. Usai

Function : Author

R. Veenhof

Function : Author

H. K. Wöhri

Function : Author

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-->µ+µ- 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 directly to the chiral condensate.

Keywords

quantum chromodynamics pion-pion interactions rho mesons meson leptonic decay heavy ion-nucleus reactions

Domains

High Energy Physics - Experiment [hep-ex]

Sylvie Flores : Connect in order to contact the contributor

https://in2p3.hal.science/in2p3-00026024

Submitted on : Friday, May 5, 2006-10:52:08 AM

Last modification on : Friday, August 23, 2024-9:32:04 AM

Dates and versions

in2p3-00026024 , version 1 (05-05-2006)

Identifiers

HAL Id : in2p3-00026024 , version 1
ARXIV : nucl-ex/0605007
DOI : 10.1103/PhysRevLett.96.162302

Cite

R. Arnaldi, R. Averbeck, K. Banicz, J. Castor, B. Chaurand, et al.. First Measurement of the $\rho$ Spectral Function in High-Energy Nuclear Collisions. Physical Review Letters, 2006, 96, pp.162302. ⟨10.1103/PhysRevLett.96.162302⟩. ⟨in2p3-00026024⟩

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

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