Analysis of charged-particle–photon correlations in hadronic multiparticle production

Brooks, T.; Convery, M. E.; Davis, William L.; Signore, Kenneth W. Del; Jenkins, T. L.; Kangas, Erik; Knepley, Matthew G.; Kowalski, K. L.; Taylor, C.; Oh, S. H.; Walker, W. D.; Colestock, P.; Hanna, B.; Martens, M.; Streets, J.; Ball, R. C.; Gustafson, H. R.; Jones, L. W.; Longo, Michael J.; Bjorken, James D.; Abashian, A.; Morgan, N.; Pruneau, C.

doi:10.1103/physrevd.55.5667

Cited by 33 publications

(38 citation statements)

References 25 publications

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“…Useful tools, the factorial moments of multiplicity distributions, well known in the multiparticle-dynamics community, appear to allow a sensitive search strategy for DCC in small phase-space intervals. From the joint multiplicity distribution of pions and gammas, one constructs robust measures [90] for detecting the presence of DCC. At present there is activity, especially with regard to exploiting wavelet analysis techniques [91], in generalizing these methods to large phase-space regions, in order to search for unusual pattern structure created by this mechanism.…”

Section: Is Disoriented Chiral Condensate Produced?mentioning

confidence: 99%

A full-acceptance detector at the LHC (FELIX)

Ageev¹,

Akhobadze²,

Alvero³

et al. 2002

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

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The FELIX collaboration had proposed the construction of a full-acceptance detector for the LHC. The primary mission of FELIX was the study of QCD: to provide comprehensive and definitive observations of a very broad range of strong-interaction processes. This document contains an extensive discussion of this physics menu. In a further paper the FELIX detector will be reviewed. Contents HISTORYWith the advent of the large hadron collider (LHC), we are on the threshold of a new era in high-energy physics. With instrumentation in the form of dedicated experiments of unprecedented precision and complexity, the LHC will move significantly beyond the current high-energy frontier, and dramatically improve our understanding of particle physics at the highest energies and shortest distances accessible to man.As currently planned, however, the LHC experimental programme is incomplete. Moreover, these deficiencies continue and extend what has been a gap in the experimental programme of all hadron colliders. The problem lies in the design of the detectors instrumenting hadron colliders: they are all optimized for rare, high-pt events. These 'general purpose' detectors are anything but that. Rather, they are designed to explore extreme shortdistance phenomena. Without intending to demean the efforts of the collaborations which have built or are building these detectors, it is nevertheless these events in which the theorists are most confident that they understand the physics, and are in many ways experimentally most accessible.While there is no doubt that such physics and such detectors should be the centrepiece of any programme of hadron collider physics, it seems much less clear that they should be the only item on the agenda. Indeed, it can be argued that a full-acceptance detector, capable of detecting and measuring each particle in an event well, may have the greatest discovery potential. Alas, the absence of any experimental effort in this direction in the collider era has meant that both theoretical investigations and experimental design of such detectors has languished, to the point that many in the community have come to think of high-pt physics as the last frontier in particle physics.The FELIX collaboration sought to rectify this situation. With support from the CERN administration, some 160 physicists collaborated in preparing the FELIX LoI. Many of these could not officially join the collaboration, and so their help could only be acknowledged. While the FELIX proposal was never officially killed, it was nevertheless effectively killed without the collaboration making a formal presentation to the LHC committee.All of this, of course, is history, and not very pleasant history at that. The motivation for a full-acceptance detector remains, however, and interest on the part of the broader community, despite the implications of this history, remains high. Because of this, the FELIX collaboration, together with those who helped but were not members, believes that it is important to document the physics of a ...

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Section: Is Disoriented Chiral Condensate Produced?mentioning

confidence: 99%

A full-acceptance detector at the LHC (FELIX)

Ageev¹,

Akhobadze²,

Alvero³

et al. 2002

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

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“…The moments of f will be very different in the two scenarios. Different moments of the fraction f can be expressed in terms of observables constructed out of a proper combination of moments [28,29,36] of event-byevent multiplicities of charged particles (N ch ) and photons (N γ ). The observables for charged-to-neutral fluctuations have to be insensitive to detector effects and at the same time sensitive to a rather small strength of ch − γ correlation.…”

Section: Analysis Methodsmentioning

confidence: 99%

“…The observables for charged-to-neutral fluctuations have to be insensitive to detector effects and at the same time sensitive to a rather small strength of ch − γ correlation. So, the idea is to use proper combination of factorial moments of multiplicities to remove the efficiency and acceptance effects [28,29,36] and express the observables in terms of the moments of f . Two such observables available in the literature are used in this analysis.…”

Section: Analysis Methodsmentioning

confidence: 99%

“…The existence of such a phenomenon was previously investigated in heavy-ion collisions at the SPS [24][25][26][27] at √ s N N =17.3 GeV and at Tevatron in p +p collisions by the Minimax [28,29] collaboration at √ s N N =1.8 TeV.…”

Section: Introductionmentioning

confidence: 99%

“…However, it can been shown that for observables constructed from proper combinations of factorial moments of multiplicities, several detector effects can be minimized [28,29,35,36]. In this analysis, we use observables and the approach available in the literature [28,29,35,36] that are specifically designed to study the sensitivity of the strength of ch − γ correla-tion. It must be noted that there are no quantitative predictions for DCC-like correlations in terms of inclusive ch − γ correlations in the kinematic range of our measurement.…”

Section: Introductionmentioning

confidence: 99%

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Charged-to-neutral correlation at forward rapidity in Au + Au collisions atsNN=200GeV

Adamczyk¹,

Zhu²,

Spinka³

et al. 2015

Phys. Rev. C

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Event-by-event fluctuations of the multiplicities of inclusive charged particles and photons at forward rapidity in Au+Au collision at √ sNN =200 GeV have been studied. Dominant contribution to such fluctuations is expected to come from correlated production of charged and neutral pions. We search for evidences of dynamical fluctuations of different physical origins. Observables constructed out of moments of multiplicities are used as measures of fluctuations. Mixed events and model calculations are used as baselines. Results are compared to the dynamical net-charge fluctuations measured in the same acceptance. A non-zero statistically significant signal of dynamical fluctuations is observed in excess to the model prediction when charged particles and photons are measured in the 3 same acceptance. We find that, unlike dynamical net-charge fluctuation, charge-neutral fluctuation is not dominated by correlation due to particle decay. Results are compared to the expectations based on the generic production mechanism of pions due to isospin symmetry, for which no significant (< 1%) deviation is observed.

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