φ production in In-In collisions at 158 A GeV

被引：18

作者：

Arnaldi, R. ^{[1
]}

Banicz, K. ^{[6
,9
]}

Borer, K. ^{[2
]}

Castor, J. ^{[7
,8
]}

Chaurand, B. ^{[11
,12
]}

Chen, W. ^{[3
]}

Cicalo, C. ^{[5
]}

Colla, A. ^{[1
,14
]}

Cortese, P. ^{[1
,14
]}

Damjanovic, S. ^{[6
,9
]}

David, A. ^{[6
,10
]}

de Falco, A. ^{[4
,5
]}

Devaux, A. ^{[7
,8
]}

Ducroux, L. ^{[15
]}

En'yo, H. ^{[13
]}

Fargeix, J. ^{[7
,8
]}

Ferretti, A. ^{[1
,14
]}

Floris, M. ^{[4
,5
]}

Foerster, A. ^{[6
]}

Force, P. ^{[7
,8
]}

Guettet, N. ^{[6
,7
,8
]}

Guichard, A. ^{[15
]}

Gulkanyan, H. ^{[16
]}

Heuser, J. ^{[13
]}

Keil, M. ^{[6
,10
]}

Kluberg, L. ^{[6
,11
,12
]}

Li, Z. ^{[3
]}

Lourenco, C. ^{[6
]}

Lozano, J. ^{[10
]}

Manso, F. ^{[7
,8
]}

Martins, P. ^{[6
,10
]}

Masoni, A. ^{[5
]}

Neves, A. ^{[10
]}

Ohnishi, H. ^{[13
]}

Oppedisano, C. ^{[1
]}

Parracho, P. ^{[6
,10
]}

Pillot, P. ^{[15
]}

Poghosyan, T. ^{[16
]}

Puddu, G. ^{[4
,5
]}

Radermacher, E. ^{[6
]}

Ramalhete, P. ^{[6
,10
]}

Rosinsky, P. ^{[6
]}

Scomparin, E. ^{[1
]}

Seixas, J. ^{[10
]}

Serci, S. ^{[4
,5
]}

Shahoyan, R. ^{[6
,10
]}

Sonderegger, P. ^{[10
]}

Specht, H. J. ^{[9
]}

Tieulent, R. ^{[15
]}

Uras, A. ^{[4
,5
]}

机构：

[1] Ist Nazl Fis Nucl, I-10125 Turin, Italy

[2] High Energy Phys Lab, Bern, Switzerland

[3] BNL, Upton, NY USA

[4] Univ Cagliari, Cagliari, Italy

[5] Ist Nazl Fis Nucl, I-10125 Turin, Italy

[6] CERN, Geneva, Switzerland

[7] Univ Blaise Pascal, Clermont Ferrand, France

[8] CNRS, IN2P3, Clermont Ferrand, France

[9] Heidelberg Univ, Inst Phys, D-6900 Heidelberg, Germany

[10] Inst Super Tecn, Lisbon, Portugal

[11] Ecole Polytech, LLR, Palaiseau, France

[12] Ecole Polytech, CNRS, IN2P3, F-91128 Palaiseau, France

[13] RIKEN, Saitama, Japan

[14] Univ Turin, Turin, Italy

[15] Univ Lyon 1, CNRS, INPL, IN2P3, F-69622 Villeurbanne, France

[16] Yerevan Phys Inst, Yerevan 375036, Armenia

[17] Univ Wisconsin, Milwaukee, WI 53201 USA

来源：

EUROPEAN PHYSICAL JOURNAL C | 2009年 / 64卷 / 01期

关键词：

INDIUM-INDIUM COLLISIONS; MESON PRODUCTION; HEAVY-ION; SPS; ENERGY; NA60; STRANGENESS; RADIATION; DILEPTON; CHARM;

D O I：

10.1140/epjc/s10052-009-1137-5

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The NA60 experiment has measured muon pair production in In-In collisions at 158 AGeV at the CERN SPS. This paper presents a high statistics measurement of phi ->mu mu meson production. Differential spectra, yields, mass and width are measured as a function of centrality and compared to previous measurements in other colliding systems at the same energy. The width of the rapidity distribution is found to be constant as a function of centrality, compatible with previous results. The decay muon polar angle distribution is measured in several reference frames. No evidence of polarization is found as a function of transverse momentum and centrality. The analysis of the p (T) spectra shows that the phi has a small radial flow, implying a weak coupling to the medium. The T (eff) parameter measured in In-In collisions suggests that the high value observed in Pb-Pb in the kaon channel is difficult to reconcile with radial flow alone. The absolute yield is compared to results in Pb-Pb collisions: though significantly smaller than measured by NA50 in the muon channel, it is found to exceed the NA49 and CERES data in the kaon channel at any centrality. The mass and width are found to be compatible with the PDG values at any centrality and at any p (T) : no evidence for in-medium modifications is observed.

引用

页码：1 / 18

页数：18

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