First measurement of the ρ 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; 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

doi:10.1103/PhysRevLett.96.162302

First measurement of the ρ 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, 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

Research output: Contribution to journal › Article › peer-review

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 π+π-→ρ→μ+μ- annihilation. The associated space-time averaged ρ 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.

Original language	English
Article number	162302
Journal	Physical Review Letters
Volume	96
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.96.162302
Publication status	Published - 2006
Externally published	Yes

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10.1103/PhysRevLett.96.162302

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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., ... Wöhri, H. K. (2006). First measurement of the ρ spectral function in high-energy nuclear collisions. Physical Review Letters, 96(16), Article 162302. https://doi.org/10.1103/PhysRevLett.96.162302

@article{2d9d9685a2134b70be509fc2c25c35be,

title = "First measurement of the ρ spectral function in high-energy nuclear collisions",

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 π+π-→ρ→μ+μ- annihilation. The associated space-time averaged ρ 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.",

author = "R. Arnaldi and R. Averbeck and K. Banicz and J. Castor and B. Chaurand and C. Cical{\`o} and A. Colla and P. Cortese and S. Damjanovic and A. David and \{De Falco\}, A. and A. Devaux and A. Drees and L. Ducroux and H. En'Yo and J. Fargeix and A. Ferretti and M. Floris and A. F{\"o}rster and P. Force and N. Guettet and A. Guichard and H. Gulkanian and Heuser, \{J. M.\} and M. Keil and L. Kluberg and C. Louren{\c c}o and J. Lozano and F. Manso and A. Masoni and P. Martins and A. Neves and H. Ohnishi and C. Oppedisano and P. Parracho and Ph Pillot and G. Puddu and E. Radermacher and P. Ramalhete and P. Rosinsky and E. Scomparin and J. Seixas and S. Serci and R. Shahoyan and P. Sonderegger and Specht, \{H. J.\} and R. Tieulent and G. Usai and R. Veenhof and W{\"o}hri, \{H. K.\}",

year = "2006",

doi = "10.1103/PhysRevLett.96.162302",

language = "English",

volume = "96",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "16",

}

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 2006, 'First measurement of the ρ spectral function in high-energy nuclear collisions', Physical Review Letters, vol. 96, no. 16, 162302. https://doi.org/10.1103/PhysRevLett.96.162302

TY - JOUR

T1 - First measurement of the ρ spectral function in high-energy nuclear collisions

AU - Arnaldi, R.

AU - Averbeck, R.

AU - Banicz, K.

AU - Castor, J.

AU - Chaurand, B.

AU - Cicalò, C.

AU - Colla, A.

AU - Cortese, P.

AU - Damjanovic, S.

AU - David, A.

AU - De Falco, A.

AU - Devaux, A.

AU - Drees, A.

AU - Ducroux, L.

AU - En'Yo, H.

AU - Fargeix, J.

AU - Ferretti, A.

AU - Floris, M.

AU - Förster, A.

AU - Force, P.

AU - Guettet, N.

AU - Guichard, A.

AU - Gulkanian, H.

AU - Heuser, J. M.

AU - Keil, M.

AU - Kluberg, L.

AU - Lourenço, C.

AU - Lozano, J.

AU - Manso, F.

AU - Masoni, A.

AU - Martins, P.

AU - Neves, A.

AU - Ohnishi, H.

AU - Oppedisano, C.

AU - Parracho, P.

AU - Pillot, Ph

AU - Puddu, G.

AU - Radermacher, E.

AU - Ramalhete, P.

AU - Rosinsky, P.

AU - Scomparin, E.

AU - Seixas, J.

AU - Serci, S.

AU - Shahoyan, R.

AU - Sonderegger, P.

AU - Specht, H. J.

AU - Tieulent, R.

AU - Usai, G.

AU - Veenhof, R.

AU - Wöhri, H. K.

PY - 2006

Y1 - 2006

N2 - 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 π+π-→ρ→μ+μ- annihilation. The associated space-time averaged ρ 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.

AB - 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 π+π-→ρ→μ+μ- annihilation. The associated space-time averaged ρ 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.

UR - https://www.scopus.com/pages/publications/33646358508

U2 - 10.1103/PhysRevLett.96.162302

DO - 10.1103/PhysRevLett.96.162302

M3 - Article

SN - 0031-9007

VL - 96

JO - Physical Review Letters

JF - Physical Review Letters

IS - 16

M1 - 162302

ER -

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

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