Pion-Pion Correlations in Antiproton Annihilation Events

Goldhaber, G.; Fowler, W.B.; Goldhaber, Sulamith; Hoang, T. F.; Kalogeropoulos, T.E.; Powell, Wilson M.

doi:10.1103/physrevlett.3.181

Cited by 213 publications

(139 citation statements)

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“…Since the first observation of BEC in identically charged pions produced in pp collisions [6], the effect has been studied for multiboson systems produced in leptonic, hadronic and nuclear collisions . At the LHC, the BEC effect has been studied by the ALICE, ATLAS and CMS collaborations in proton-proton [26][27][28][29][30], proton-lead [31] and lead-lead [31,32] collisions.…”

Section: Introductionmentioning

confidence: 99%

Bose-Einstein correlations of same-sign charged pions in the forward region in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV

Aaij¹,

Adeva²,

Adinolfi³

et al. 2017

J. High Energ. Phys.

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Bose-Einstein correlations of same-sign charged pions, produced in protonproton collisions at a 7 TeV centre-of-mass energy, are studied using a data sample collected by the LHCb experiment. The signature for Bose-Einstein correlations is observed in the form of an enhancement of pairs of like-sign charged pions with small four-momentum difference squared. The charged-particle multiplicity dependence of the Bose-Einstein correlation parameters describing the correlation strength and the size of the emitting source is investigated, determining both the correlation radius and the chaoticity parameter. The measured correlation radius is found to increase as a function of increasing charged-particle multiplicity, while the chaoticity parameter is seen to decrease.

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Section: Introductionmentioning

confidence: 99%

Bose-Einstein correlations of same-sign charged pions in the forward region in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV

Aaij¹,

Adeva²,

Adinolfi³

et al. 2017

J. High Energ. Phys.

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“…In the concluding remarks (Section IV) 1 we briefly discuss the dependence of the BE effect on the available energy for annihilation. This gives one instance of how further experimental study may reveal whether or not the present considerations provide substantially the correct approach to the problem.…”

Section: Introductionmentioning

confidence: 99%

“…For the statement of our ideas 1 it is helpful to recall first wha,t the assumptions of the usual statistical model (SM) are. For definiteness, consider the system enclosed in a large box with volume V and with periodic boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

“…For definiteness, consider the system enclosed in a large box with volume V and with periodic boundary conditions. A first assumption of the SM is that the rate of annihilation into any given N1r state is proportional to PN (Q), given by ( 1) Here n is the "reaction volume II in which the statistical mixture of states is supposed to be produced. In the following description 1 3 it is helpful to interpret PN(Q) as the probability to find N free pions in the reaction volume:…”

Section: Introductionmentioning

confidence: 99%

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Influence of Bose-Einstein Statistics on the Antiproton-Proton Annihilation Process

et al. 1960

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Recent observations of angular distributions of TT mesons in p-p i, annihilation indicate a deviation from the predictions of the usual Fermi statistical model. In order to shed light on these phenomena, a modification of the statistical model is studied. We retain the assumption that the transition rate into a given final state is proportional to the probability of finding N free TT mesons in the reaction volume, but express this probability in terms of wave functions symmetrized with respect to particles of like charge. The justification of this assumption is discus sed. The model reproduces the experimental results qualitatively, provided the radius of the interaction volume is between one -half and three -fourths of the pion Compton wave length; the dependence of angular correlation effects on the value of the radius is rather sensitive. Quantitatively, there seems to remain some discrepancy, but we cannot say whether this is due to experi-. mental uncertainties or to some other dynamic effects. In the absence of information on TT-TT interactions and of a fully satisfactory explanation of the mean pion multiplicity for annihilation, we wish to emphasize the preliminary nature of our results. We consider them, however, as an indication that the symmetrization effects discussed here may well play a major role in the analysis of angular distributions although it is too early to say whether or -3-UCRL-9169 not these effects can account, quantitatively for the phenomena. It is pointed out that in this respect the ene'rgy dependence of the angular corre-

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“…In particle physics the HBT-effect was rediscovered in 1959 by G. and S. Goldhaber, Lee and Pais in antiproton-proton annihilation [2]. The GGLP effect, as it was called then, in its original form, described the tendency of pairs of like-sign pions to have smaller opening angles than pairs of unlike-sign pions.…”

Section: Introductionmentioning

confidence: 99%

Bose-Einstein correlations in deep inelastic e+p scattering at HERA

Charlet

1997

AIP Conference Proceedings

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Two-particle correlations in invariant mass are studied separately for like-sign and unlike-sign charged particles produced in deep inelastic positron-proton scattering in a new kinematical domain. The data were taken with the H1 detector at the HERA storage ring in 1994, in which 27.5 GeV positrons collided with 820 GeV protons at a centre of mass energy √ s = 300 GeV.The observed enhancement of the like-sign correlations at low invariant masses is related to the dimensions of the hadronic source. The data are compared to different QCD models where the hadronization is performed with the string-fragmentation model. Results are presented for the first time separately for diffractive and non-diffractive scattering, in domains of four-momentum transfer, Bjorken-x, and hadronic center of mass energy, and in intervals of charged particle multiplicity. The observed source radii do not differ strongly from those measured in lower energy lepton-nucleon inelastic scattering, and e + e − annihilation.

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Pion-Pion Correlations in Antiproton Annihilation Events

Abstract: These gamma rays have also been observed from magnesium in the present experiment.

Cited by 213 publications

References 4 publications

Bose-Einstein correlations of same-sign charged pions in the forward region in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV

Bose-Einstein correlations of same-sign charged pions in the forward region in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV

Influence of Bose-Einstein Statistics on the Antiproton-Proton Annihilation Process

Bose-Einstein correlations in deep inelastic e+p scattering at HERA

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