Systematic study of low-mass electron pair production in p–Be and p–Au collisions at 450 GeV/ $c$

Agakichiev, G.; Appenheimer, M.; Averbeck, R.; Ballester, Ferrán; Baur, Regina; Brenschede, A.; Diaz, J. C.; Faschingbauer, U.; Ferrero, J.L.; Fischer, P.; Fraenkel, Z.; Franke, M.; Fuchs, Christopher A.; Gatti, E.; Glässel, P.; Günzel, Th.; Heros, C. Pérez de los; Heß, F.; Holzmann, R.; Iourevitch, V.; Irmscher, D.; Jacob, C.; Kuhn, W. R.; Lenkeit, B.; Löhner, H.; Marı́n, A.; Marques, Fernando; Martínez, G.; Metag, V.; Notheisen, M.; Novotny, R.; Olsen, L.; Ostendorf, R.W.; Panebrattsev, Y.; Pfeiffer, Anne; Ravinovich, I.; Řehák, P.; Sampietro, Marco; Schön, Astrid; Schukraft, J.; Schutz, Y.; Shimansky, S.; Shor, A.; Simon, R. S.; Specht, Holger; Steiner, V.; Tapprogge, S.; Tel-Zur, G.; Tserruya, I.; Ullrich, T.; Wilschut, Hans; Wurm, J.P.

doi:10.1007/s100530050204

Cited by 39 publications

(21 citation statements)

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“…The η ω and the φ ω ratios were found to be nearly p T independent. The value of the η ω ratio is in good agreement with previous pp and p-Be measurements [9]. The φ ω ratio is higher than in pp, as expected in nucleus-nucleus collisions.…”

supporting

confidence: 91%

φ Production in Proton-Nucleus and Indium-Indium Collisions at the CERN SPS

Floris

Arnaldi

Averbeck

et al. 2006

AIP Conference Proceedings

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Abstract. The quality of the dimuon measurements made by NA60, in proton-nucleus and heavyion collisions, is much better than that reached by previous experiments, such as NA38 and NA50. The most important improvement is due to the use of a radiation-tolerant silicon vertex telescope, placed immediately downstream of the target. This allows NA60 to do a high quality measurement of φ meson yields and p T distributions. This paper presents results obtained in p-Be, p-In and p-Pb collisions at 400 GeV, from data collected in 2002, and in In-In collisions at 158 AGeV, as a function of centrality, from the 2003 running period. In particular, we show that the inverse m T slope measured in In-In collisions, in the φ µµ decay channel, increases with the number of nucleons participating in the collisions, rather than following a flat trend as seen in the NA50 data collected in the same decay channel but restricted to high p T values. We also show that our measurements seem to agree with the values previously measured by NA49, using φ KK decays, in Pb-Pb and other collision systems.

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supporting

confidence: 91%

φ Production in Proton-Nucleus and Indium-Indium Collisions at the CERN SPS

Floris

Arnaldi

Averbeck

et al. 2006

AIP Conference Proceedings

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“…The enhancement is most conspicuous for electron pairs in the region of invariant masses from 300 to 700 MeV/c 2 measured close to midrapidity [3]. The comparison to expectations from conventional sources rests on a simultaneous study of neutral meson and e + e − pair production in 450 GeV p-Be and p-Au [6,7] where it was demonstrated that the measured e + e − pair mass spectra are very well described in shape as well as absolute yield by the direct and Dalitz decays of neutral mesons. For S-Au, the hadronic sources were scaled proportional to charged-particle multiplicity.…”

mentioning

confidence: 97%

Low-mass e+e− pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum

Agakichiev¹,

Baur²,

Braun‐Munzinger³

et al. 1998

Physics Letters B

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216

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We report a measurement of low-mass electron pairs observed in 158 GeV/nucleon Pb-Au collisions. The pair yield integrated over the range of invariant masses 0.2 ≤ m ≤ 2.0 GeV/c 2 is enhanced by a factor of 3.5 ± 0.4 (stat) ± 0.9 (syst) over the expectation from neutral meson decays. As observed previously in S-Au collisions, the enhancement is most pronounced in the invariant-mass region 300-700 MeV/c 2 . For Pb-Au we find evidence for a strong increase of the enhancement with centrality. In addition, we show that the enhancement covers a wide range in transverse momentum, but is largest at the lowest observed p ⊥ .

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“…+ e − mass spectra of 450 GeV pBe, p-Au, and 200 AGeV S-Au collisions (Agakichiev et al, 1998(Agakichiev et al, , 1995. Plotted is the number of electron pairs per charged particle, both in the acceptance and per event.…”

Section: Fig 43 Ceres Inclusive Ementioning

confidence: 99%

Hadron properties in the nuclear medium

2010

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The QCD vacuum shows the dynamical breaking of chiral symmetry. In the hot/dense QCD medium, the chiral order parameter such as qq is expected to change as function of temperature T and density ρ of the medium, and its experimental detection is one of the main challenges in modern hadron physics. In this article, we discuss theoretical expectations for the in-medium hadron spectra associated with partial restoration of chiral symmetry and the current status of experiments with an emphasis on the measurements of properties of mesons produced in nearground-state nuclei.

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Systematic study of low-mass electron pair production in p–Be and p–Au collisions at 450 GeV/ $c$

Cited by 39 publications

References 0 publications

φ Production in Proton-Nucleus and Indium-Indium Collisions at the CERN SPS

φ Production in Proton-Nucleus and Indium-Indium Collisions at the CERN SPS

Low-mass e+e− pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum

Hadron properties in the nuclear medium

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