Partial coherence in the core–halo picture of Bose–Einstein n-particle correlations

Csörgő, T.; Lörstad, B.; Schmidt-Sørensen, J.; Ster, A.

doi:10.1007/s100529900024

Cited by 17 publications

(7 citation statements)

References 16 publications

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“…Such full covering differs from the situation in [21,22,23,24] where only the imaging of data with 2σ (or 3σ) uncertainty gave some overlapping. Also unlike [21,22,23,24], we present explicit momentum dependence for λ (2) , λ (3) . Besides, our approach assumes complete chaoticity of particle sources.…”

Section: Likewise Using the Values λmentioning

confidence: 69%

“…In each panel we observe that (the strip formed by) λ (3) -triple of curves fully covers (the strip of) λ (2) -triple. Such full covering differs from the situation in [21,22,23,24] where only the imaging of data with 2σ (or 3σ) uncertainty gave some overlapping. Also unlike [21,22,23,24], we present explicit momentum dependence for λ (2) , λ (3) .…”

Section: 7mentioning

confidence: 86%

“…The whole our treatment assumes complete chaoticity of sources, in contrast to other approaches [21,22,23,24] to simultaneous description of two-and three-pion correlations in terms of two phenomenological parameters where, in the core-halo picture, one of the parameters reflects partial non-chaoticity or coherence and the other means a measure of core fraction.…”

Section: Clearly Items In This List May Be Interrelated Say (A)-(bmentioning

confidence: 99%

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Combined Analysis of Two- and Three-Particle Correlations in q,p-Bose Gas Model

Gavrilik¹

2006

SIGMA

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Abstract. q-deformed oscillators and the q-Bose gas model enable effective description of the observed non-Bose type behavior of the intercept ("strength") λ (2) ≡ C (2) (K, K) − 1 of two-particle correlation function C (2) (p 1 , p 2 ) of identical pions produced in heavy-ion collisions. Three-and n-particle correlation functions of pions (or kaons) encode more information on the nature of the emitting sources in such experiments. And so, the q-Bose gas model was further developed: the intercepts of n-th order correlators of q-bosons and the n-particle correlation intercepts within the q,p-Bose gas model have been obtained, the result useful for quantum optics, too. Here we present the combined analysis of two-and three-pion correlation intercepts for the q-Bose gas model and its q,p-extension, and confront with empirical data (from CERN SPS and STAR/RHIC) on pion correlations. Similar to explicit dependence of λ (2) on mean momenta of particles (pions, kaons) found earlier, here we explore the peculiar behavior, versus mean momentum, of the 3-particle correlation intercept λ (3) (K). The whole approach implies complete chaoticity of sources, unlike other joint descriptions of two-and three-pion correlations using two phenomenological parameters (e.g., core-halo fraction plus partial coherence of sources).

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Section: Likewise Using the Values λmentioning

confidence: 69%

Section: 7mentioning

confidence: 86%

Section: Clearly Items In This List May Be Interrelated Say (A)-(bmentioning

confidence: 99%

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Combined Analysis of Two- and Three-Particle Correlations in q,p-Bose Gas Model

Gavrilik¹

2006

SIGMA

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“…The corrected CFs, C(q), are obtained separately for spherical and jet-like events. The femtoscopic correlations are then determined using 2.2 ± = 13.9 as in [22], where f 2 c is the pair fraction from the core of the particle-emission source [23], K(q) is the FSI correlation and C QS (q) is the extracted QS correlation. The K(q) factor is well known and calculated using the two-pion FSI wave functions [24] that include Coulomb and strong interactions.…”

Section: Two-pion Correlation Function Analysismentioning

confidence: 99%

Event-shape and multiplicity dependence of freeze-out radii in pp collisions at $$ \sqrt{s} $$ = 7 TeV

Acharya

Adamová

Adhya

et al. 2019

J. High Energ. Phys.

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Two-particle correlations in high-energy collision experiments enable the extraction of particle source radii by using the Bose-Einstein enhancement of pion production at low relative momentum q ∝ 1/R. It was previously observed that in pp collisions at √ s = 7 TeV the average pair transverse momentum k T range of such analyses is limited due to large background correlations which were attributed to mini-jet phenomena. To investigate this further, an event-shape dependent analysis of Bose-Einstein correlations for pion pairs is performed in this work. By categorizing the events by their transverse sphericity S T into spherical (S T > 0.7) and jet-like (S T < 0.3) events a method was developed that allows for the determination of source radii for much larger values of k T for the first time. Spherical events demonstrate little or no background correlations while jet-like events are dominated by them. This observation agrees with the hypothesis of a mini-jet origin of the non-femtoscopic background correlations and gives new insight into the physics interpretation of the k T dependence of the radii. The emission source size in spherical events shows a substantially diminished k T dependence, while jet-like events show indications of a negative trend with respect to k T in the highest multiplicity events. Regarding the emission source shape, the correlation functions for both event sphericity classes show good agreement with an exponential shape, rather than a Gaussian one.

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“…In the core-halo model, the fraction of the core is defined by (13) where N core is the number of pions in the core, and N halo is the number of pions in the halo. If there is partial coherence in the core, a coherence parameter can be introduced [19,20], examining the fraction of coherently produced pions in the core: (14) where N coherent + N incoherent = N core . With these, λ 2 and λ 3 can be expressed as functions of f c and p c :…”

Section: Introductionmentioning

confidence: 99%

PHENIX Results of Three-Particle Bose-Einstein Correlations in ${\sqrt{s_{NN}}}$ = 200 GeV Au+Au Collisions

Novák

2018

Universe

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Bose-Einstein correlations (BECs) of identical hadrons reveal information about hadron creation from the strongly interacting matter formed in ultrarelativistic heavy-ion collisions. The measurement of three-particle correlations may in particular shed light on hadron creation mechanisms beyond thermal/chaotic emission. In this paper, we show the status of PHENIX measurements of three-pion correlations as a function of momentum differences within the triplets. We analyze the shape of the correlation functions through the assumption of Lévy sources and a proper treatment of the Coulomb interaction within the triplets. We measure the three-particle correlation strength (λ 3), which, together with the two-particle correlation strength λ 2 , encodes information about hadron creation mechanisms. From a consistent analysis of two-and three-particle correlation strengths, we establish a new experimental measure of thermalization and coherence in the source.

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Partial coherence in the core–halo picture of Bose–Einstein n-particle correlations

Cited by 17 publications

References 16 publications

Combined Analysis of Two- and Three-Particle Correlations in q,p-Bose Gas Model

Combined Analysis of Two- and Three-Particle Correlations in q,p-Bose Gas Model

Event-shape and multiplicity dependence of freeze-out radii in pp collisions at $$ \sqrt{s} $$ = 7 TeV

PHENIX Results of Three-Particle Bose-Einstein Correlations in \({\sqrt{s_{NN}}}\) = 200 GeV Au+Au Collisions

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