Beam energy and centrality dependence of two-pion Bose–Einstein correlations at SPS energies

Adamová, D.; Agakichiev, G.; Appelshäuser, H.; Belaga, V. V.; Braun‐Munzinger, P.; Campagnolo, R.; Castillo, A.; Cherlin, A.; Damjanović, S.; Dietel, T.; Dietrich, L.; Drees, A.; Esumi, S.; Filimonov, K.; Fomenko, K.; Fraenkel, Z.; Garabatos, C.; Glässel, P.; Hering, G.; Holeczek, J.; Kushpil, V.; Lenkeit, B.; Ludolphs, W.; Maas, Axel; Marı́n, A.; Milošević, J.; Milov, A.; Miśkowiec, D.; Musa, L.; Panebrattsev, Y.; Petchenova, O.; Petráček, V.; Pfeiffer, A.; Rak, J.; Ravinovich, I.; Řehák, P.; Richter, Matthias; Sako, H.; Schmitz, W.; Schukraft, J.; Sedykh, S.; Seipp, W.; Sharma, A.; Shimansky, S.; Slívová, J.; Specht, H.J.; Stachel, J.; Šumbera, M.; Tilsner, H.; Tserruya, I.; Wessels, J. P.; Wienold, T.; Windelband, B.; Wurm, J.P.; Xie, W.; Yurevich, S.; Yurevich, V. I.

doi:10.1016/s0375-9474(02)01369-6

Cited by 89 publications

(75 citation statements)

References 42 publications

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“…6). For central Pb-Pb collisions at SPS energies, the typical results for transverse surface velocity and thermal freezeout temperature are (β s ⊥ /c, T fo [MeV]) = (0.65 ± 0.1, 120 ± 10) [79,80,81,82], which is quite comparable to the values used here for InIn. We emphasize that all contributions to the dilepton spectrum (QGP, ρ, ω, φ, and four-pion) are tied to the same evolution, thus fixing their relative weights.…”

Section: Thermal Fireball Evolutionsupporting

confidence: 76%

Dilepton radiation at the CERN super-proton synchrotron

2008

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A quantitative evaluation of dilepton sources in heavy-ion reactions is performed taking into account both thermal and non-thermal production mechanisms. The hadronic thermal emission rate is based on an electromagnetic current-correlation function with a low-mass region (LMR, M 1 GeV) dominated by vector mesons (ρ, ω, φ) and an intermediate-mass region (IMR, 1 GeV ≤ M ≤ 3 GeV) characterized by (the onset of) a multi-meson continuum. A convolution of the emission rates over a thermal fireball expansion results in good agreement with experiment in the low-mass spectra, confirming the predicted broadening of the ρ meson in hadronic matter in connection with the prevalence of baryon-induced medium effects. The absolute magnitude of the LMR excess is mostly controlled by the fireball lifetime, which in turn leads to a consistent explanation of the dilepton excess in the IMR in terms of thermal radiation. The analysis of experimental transversemomentum (qT ) spectra reveals discrepancies with thermal emission for qT 1 GeV in noncentral In-In collisions, which we address by extending our calculations by: (i) a refined treatment of ρ decays at thermal freezeout, (ii) primordially produced ρ's subject to energy-loss, (iii) Drell-Yan annihilation, and (iv) thermal radiation from t-channel meson exchange processes. We investigate the sensitivity of dilepton spectra to the critical temperature and hadro-chemical freezeout of the fireball. The ρ broadening in the LMR turns out to be robust, while in the IMR Quark-Gluon Plasma radiation is moderate unless the critical temperature is rather low.

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Section: Thermal Fireball Evolutionsupporting

confidence: 76%

Dilepton radiation at the CERN super-proton synchrotron

2008

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“…Comparison of femtoscopic radii as a function of measured charged-particle multiplicity, for a number of collision systems and collision energies [18,46,53]. Dashed lines show linear fits done to heavy-ion data, excluding ALICE (dotted lines show one-sigma contour).…”

Section: Comparison To Previous Measurementsmentioning

confidence: 99%

Centrality dependence of pion freeze-out radii in Pb-Pb collisions atsNN=2.76 TeV

et al. 2016

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We report on the measurement of freeze-out radii for pairs of identical-charge pions measured in Pb-Pb collisions at √ s NN = 2.76 TeV as a function of collision centrality and the average transverse momentum of the pair k T . Three-dimensional sizes of the system (femtoscopic radii), as well as direction-averaged onedimensional radii are extracted. The radii decrease with k T , following a power-law behavior. This is qualitatively consistent with expectations from a collectively expanding system, produced in hydrodynamic calculations. The radii also scale linearly with dN ch /dη 1/3 . This behavior is compared to world data on femtoscopic radii in heavy-ion collisions. While the dependence is qualitatively similar to results at smaller √ s NN , a decrease in the ratio R out /R side is seen, which is in qualitative agreement with a specific prediction from hydrodynamic models: a change from inside-out to outside-in freeze-out configuration. The results provide further evidence for the production of a collective, strongly coupled system in heavy-ion collisions at the CERN Large Hadron Collider.

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“…Small samples of the 20% and the minimum bias collisions, as well as a short run at 80 AGeV, were recorded in addition. The first two-particle correlation analysis performed on a subset of these data resulted, among others, in an improved procedure to account for the Coulomb interaction [3] and a new postulate of a universal freeze-out criterion [4]. The current analysis features a better momentum resolution…”

Section: Experiments and Data Analysismentioning

confidence: 99%

“…The Coulomb factor was attenuated by λ similarly as the rest of the correlation function peak; the importance of this approach was demonstrated in [3]. The fits were performed by the minimum negative loglikelihood method with the Poissonian number of true pairs and were done separately for each pair (p t ,y) bin.…”

Section: Two-pion Correlationsmentioning

confidence: 99%