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Ahle, L.; Akiba, Y.; Ashktorab, K.; Baker, M. D.; Beavis, D.; Beery, P. D.; Britt, H. C.; Budick, B.; Chang, James; Chasman, C.; Chen, Z.; Y., C.; Chu, Y. Y.; Cianciolo, V.; Cole, B.; Costales, J. B.; Crawford, H. J.; Cumming, J. B.; Debbe, R.; Dunlop, J. C.; Eldredge, W.; Engelage, J.; Fung, S. Y.; Garcia, E. Oliver; Gonin, M.; Gushue, S.; Hamagaki, H.; Hansen, L.F.; Hayano, R.; Hayashi, Shûichi; Heintzelman, G. A.; Homma, S.; Judd, E. G.; Kaneko, H.; Kang, Joon Ho; Kaufman, S.B.; Kehoe, W. L.; Kim, E. J.; Kumagai, A.; Kurita, K.; Ledoux, R. J.; Lee, J. H.; LeVine, M. J.; Luke, Jon C.; Miake, Y.; Mignerey, A. C.; Morrison, D. P.; Morse, R. J.; Moskowitz, B.; Moulson, M.; Müntz, C.; Nagamiya, S.; Namboodiri, M.N.; Nayak, T. K.; Ogilvie, C. A.; Olness, J.W.; Parsons, C. G.; Remsberg, L. P.; Roehrich, Dieter; Rothschild, P.; Sako, H.; Sakuraï, H.; Sangster, T. C.; Seto, R.; Shea, J.; Shigaki, K.; Soltz, R. A.; Stankus, P. W.; Steadman, S. G.; Stephans, G. S. F.; Sung, Tae–Hyun; Tanaka, Y. K.; Tannenbaum, M. J.; Thomas, J. H.; Tonse, S.; Ueno-Hayashi, S.; Dijk, J. H. van; Videbæk, F.; Vossnack, O.; Vutsadakis, V.; Wang, F.; Wang, Y.; Wegner, H. E.; Woodruff, D. S.; Wu, Y.; Xiang, H.; Xu, G.; Yagi, K.; Yang, X.; Yao, H.; Zachary, D.; Zajc, W. A.; Zhu, Fan

doi:10.1103/physrevc.66.054906

Cited by 39 publications

(15 citation statements)

References 33 publications

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“…The correlation function C(q) is assumed to be fit best by the ratio of their means, and a flat Bayesian prior is assumed for both means. A corresponding χ 2 analog [72], the negative log-likelihood ratio L [73], is minimized using the Minuit package [74]:…”

Section: Fitting Proceduresmentioning

confidence: 99%

Femtoscopy with identified charged pions in proton-lead collisions at sNN=5.02 TeV with ATLAS

Aaboud¹,

Kupčo²,

Davison³

et al. 2017

Phys. Rev. C

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Femtoscopy with identified charged pions in proton-lead collisions at√ s NN = 5.02 TeV with ATLASThe ATLAS Collaboration Bose-Einstein correlations between identified charged pions are measured for p+Pb collisions at √ s NN = 5.02 TeV using data recorded by the ATLAS detector at the LHC corresponding to a total integrated luminosity of 28 nb −1 . Pions are identified using ionization energy loss measured in the pixel detector. Two-particle correlation functions and the extracted source radii are presented as a function of collision centrality as well as the average transverse momentum (k T ) and rapidity (y ππ ) of the pair. Pairs are selected with a rapidity −2 < y ππ < 1 and with an average transverse momentum 0.1 < k T < 0.8 GeV. The effect of jet fragmentation on the two-particle correlation function is studied, and a method using oppositecharge pair data to constrain its contributions to the measured correlations is described. The measured source sizes are substantially larger in more central collisions and are observed to decrease with increasing pair k T . A correlation of the radii with the local chargedparticle density is demonstrated. The scaling of the extracted radii with the mean number of participating nucleons is also used to compare a selection of initial-geometry models. The cross-term R ol is measured as a function of rapidity, and a nonzero value is observed with 5.1σ combined significance for −1 < y ππ < 1 in the most central events.1 ATLAS uses a right-handed coordinate system with its origin at the nominal interaction point (IP) in the center of the detector and the z-axis along the beam pipe. The x-axis points from the IP to the center of the LHC ring, and the y-axis points upward. Cylindrical coordinates (r, φ) are used in the transverse plane, φ being the azimuthal angle around the beam pipe. The pseudorapidity is defined in terms of the polar angle θ as η = − ln tan(θ/2). P 8) minimum-bias events are generated at a center-of-mass energy per nucleon-nucleon pair of √ s NN = 5.02 TeV. Hp+Pb The energy and boost settings are the same as in the nominal p+Pb reconstructed simulation, except that the minimum hard-scattering transverse momentum is adjusted as described in Section 4.2. This boost is applied only in the p+Pb sample. Hpp The generator is run with all settings the same as in the p+Pb sample, except that both incoming particles are protons. P8 pp [54] The set of generator parameters from ATLAS "UE AU2-CTEQ6L1" [55] is used with P 8.209, which utilizes the CTEQ 6L1 [56] parton distribution function (PDF) from LHAPDF6 [57]. Herwig ++ pp [58]The NNLO MRST PDF [59] is used with Herwig ++ 2.7.1.

show abstract

Section: Fitting Proceduresmentioning

confidence: 99%

Femtoscopy with identified charged pions in proton-lead collisions at sNN=5.02 TeV with ATLAS

Aaboud¹,

Kupčo²,

Davison³

et al. 2017

Phys. Rev. C

Self Cite

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“…Since the (phase) transition from hadrons to quarks might take place only in a small sub-volume and for a short timespan compared to the overall process of the heavy ion collisions (HICs), it is an intricate but essential task to explore the space-time structure of the region of homogeneity in HICs. Fortunately, a well-established technique called Hanbury-Brown-Twiss interferometry (HBT) [1,2,3] has been developed, which is now extensively used in the heavy-ion community to determine the space-time dimensions of the particle emission source for HICs with energies from SIS to RHIC [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35]. Studies on various species of two-particles other than identical charged pions have been published or are being pursued (see, e.g.…”

mentioning

confidence: 99%

Transport model analysis of the transverse momentum and rapidity dependence of pion interferometry at SPS energies

Li¹,

Bleicher²,

Stöcker³

2007

J. Phys. G: Nucl. Part. Phys.

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Based on the UrQMD transport model, the transverse momentum and the rapidity dependence of the Hanbury-Brown-Twiss (HBT) radii R L , R O , R S as well as the cross term R OL at SPS energies are investigated and compared with the experimental NA49 and CERES data. The rapidity dependence of the R L , R O , R S is weak while the R OL is significantly increased at large rapidities and small transverse momenta. The HBT "life-time" issue (the phenomenon that the calculated R 2 O − R 2 S value is larger than the correspondingly extracted experimental data) is also present at SPS energies.

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“…According to this argument, the thermal freeze-out configuration should therefore be the proper "chaotic" source in HBT measurements and the HBT radii are expected to increase substantially with increasing collision energies. However, experimental data indicate that there are only relatively small changes of HBT radii when the energy increases from AGS, SPS, to RHIC energies [6,7,8,9,10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Hanbury-Brown–Twiss interferometry with quantum transport of the interfering pair

Zhang

Wong³

2008

Phys. Rev. C

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In the late stage of the evolution of a pion system in high-energy heavy-ion collisions when pions undergo multiple scatterings, the quantum transport of the interfering pair of identical pions plays an important role in determining the characteristics of the Hanbury-Brown-Twiss (HBT) interference. We study the quantum transport of the interfering pair using the path-integral method, in which the evolution of the bulk matter is described by relativistic hydrodynamics while the paths of the two interfering pions by test particles following the fluid positions and velocity fields. We investigate in addition the effects of secondary pion sources from particle decays, for nuclear collisions at AGS and RHIC energies. We find that quantum transport of the interfering pair leads to HBT radii close to those for the chemical freeze-out configuration. Particle decays however lead to HBT radii greater than those for the chemical freeze-out configuration. As a consequence, the combined effects give rise to HBT radii between those extracted from the chemical freeze-out configuration and the thermal freeze-out configuration. Proper quantum treatments of the interfering pairs in HBT calculations at the pion multiple scattering stage are important for our understanding of the characteristics of HBT interferometry in heavy-ion collisions.PACS numbers: 25.75.Gz, 25.75.Nq

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System, centrality, and transverse mass dependence of two-pion correlation radii in heavy ion collisions at11.6Aand14.6AGeV/

Cited by 39 publications

References 33 publications

Femtoscopy with identified charged pions in proton-lead collisions at sNN=5.02 TeV with ATLAS

Femtoscopy with identified charged pions in proton-lead collisions at sNN=5.02 TeV with ATLAS

Transport model analysis of the transverse momentum and rapidity dependence of pion interferometry at SPS energies

Hanbury-Brown–Twiss interferometry with quantum transport of the interfering pair

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