Coulomb corrections for interferometry analysis of expanding hadron systems

Sinyukov, Yu. M.; Lednický, R.; Akkelin, S. V.; Pluta, J.; Erazmus, B.

doi:10.1016/s0370-2693(98)00653-4

Cited by 180 publications

(131 citation statements)

References 16 publications

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“…The remaining is a convolution of the Coulomb interaction and wave-function symmetrization. As an approximation, the Coulomb part is factored out and integrated separately in the procedure known as the BowlerSinyukov fitting [48,49]. It is well tested and is applicable for pions and for the large source sizes expected in this analysis.…”

Section: B Fitting the Correlation Functionmentioning

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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Section: B Fitting the Correlation Functionmentioning

confidence: 99%

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

et al. 2016

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“…For a set of generated events the correlation function is constructed from same-event and mixed-event pairs [71]. Such a general procedure allows for an easy implementation of experimental cuts, final interaction or Coulomb corrections [72,73] and can be also applied to non-identical particle correlations [74]. The extracted multidimensional correlation functions are parameterized by the Bertsch-Pratt formula [75,76] …”

Section: Particle Spectra Flow Correlation Radiimentioning

confidence: 99%

Rapid hydrodynamic expansion in relativistic heavy-ion collisions

Božek

Wyskiel

2009

Phys. Rev. C

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Hydrodynamic expansion of the hot fireball created in relativistic Au-Au collisions at √ s = 200GeV in 3 + 1-dimensions is studied. We obtain a simultaneous, satisfactory description of the transverse momentum spectra, elliptic flow and pion correlation radii for different collision centralities and different rapidities. Early initial time of the evolution is required to reproduce the interferometry data, which provides a strong indication of the early onset of collectivity. We can also constraint the shape of the initial energy density in the beam direction, with a relatively high initial energy density at the center of the fireball.

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“…I am happy too see that by now all experiments adopted a new treatment of the final state Coulomb repulsion which takes into account the finite purity of the pion sample [31]. In Fig.…”

Section: Pion-hbt: Beam Energy and System Size Dependencementioning

confidence: 99%

Correlations and fluctuations

Appelshäuser¹

2004

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

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Abstract. New results on particle correlations and event-by-event fluctuations presented at Quark Matter 2004 are reviewed. Event-by-event fluctuationsNon-statistical event-by-event fluctuations have been proposed as a possible signature for the QCD phase transition [1,2]. The passage of the system close to the critical point of the QCD phase diagram might be indicated by a non-monotonic evolution of fluctuations as function of beam energy. These exciting predictions triggered an extensive study of event-by-event fluctuations at SPS and at RHIC. Fluctuations of the mean transverse momentumThe existence of non-statistical event-by-event fluctuations of the mean transverse momentum M pt at SPS and RHIC is by now well established. However, these dynamical fluctuations are small in central collisions, typically about 1% of the inclusive mean transverse momentum p t , and only weakly depending on √ s N N , see Fig.1 (left panel) [3,4]. This value is roughly compatible with the extrapolation of fluctuation measurements in p-p collisions [5] under the assumption of an independent superposition of particle sources in A-A. In particular, no indication for a non-monotonic beam energy dependence has been found so far. Despite the absence of a 'smoking gun' signature for the phase transition or the critical point, the systematic study of M pt fluctuations gives valuable insight into the particle production mechanism and the dynamic evolution of the system which cannot be extracted from inclusive distributions. A quantitative study requires an appropriate formalism which facilitates a comparison of results among different experiments and to theory. Presently, an unfortunate situation has arisen: Practically each experiment uses different measures for fluctuations, see [4,6,7,8,9,10]. These measures have very different sensitivities to particular experimental conditions, such as track quality cuts, tracking efficiency, and acceptance. In this sense, measures which are most closely related to single and two-particle densities appear preferable since they are the least sensitive to trivial efficiency effects [9]. In this situation, it is mandatory that

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Coulomb corrections for interferometry analysis of expanding hadron systems

Cited by 180 publications

References 16 publications

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

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

Rapid hydrodynamic expansion in relativistic heavy-ion collisions

Correlations and fluctuations

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