scholarly journals Analysis of Bose–Einstein correlation at 7 TeV by LHCb collaboration based on stochastic approach

2020 ◽  
Vol 35 (10) ◽  
pp. 2050052 ◽  
Author(s):  
Takuya Mizoguchi ◽  
Minoru Biyajima
Keyword(s):  
Negative Binomial ◽  
Hadron Collider ◽  
Stochastic Approach ◽  
Lhcb Collaboration ◽  
Forward Region ◽  
Degree Of Coherence ◽  
Multiplicity Formula ◽  
Bose Einstein ◽  
Exchange Function ◽  
Einstein Correlation

The Bose–Einstein correlation (BEC) in forward region [Formula: see text] measured at 7 TeV in the Large Hadron Collider (LHC) by the LHCb collaboration is analyzed using two conventional formulas of different types named CF[Formula: see text] and CF[Formula: see text]. The first formula is well known and contains the degree of coherence [Formula: see text] and the exchange function [Formula: see text] from the BE statistics. The second formula is an extended formula (CF[Formula: see text]) that contains the second degree of coherence [Formula: see text] and the second exchange function [Formula: see text] in addition to CF[Formula: see text]. To examine the physical meaning of the parameters estimated by CF[Formula: see text], we analyze the LHCb BEC data by using a stochastic approach of the three-negative binomial distribution and the three-generalized Glauber–Lachs formula. Our results reveal that the BEC at 7 TeV consisted of three activity intervals defined by the multiplicity [Formula: see text] ([8, 18], [19, 35], and [36, 96]) can be well explained by CF[Formula: see text].

scholarly journals Unified description of multiplicity distributions and Bose–Einstein correlations at the LHC based on the three-negative binomial distribution

2019 ◽  
Vol 34 (31) ◽  
pp. 1950203 ◽  
Author(s):  
Minoru Biyajima ◽  
Takuya Mizoguchi
Keyword(s):  
Negative Binomial Distribution ◽  
Binomial Distribution ◽  
Negative Binomial ◽  
Scaling Function ◽  
Hadron Collider ◽  
Atlas Collaboration ◽  
Monte Carlo Data ◽  
Estimated Parameters ◽  
Bose Einstein ◽  
Unified Description

Using the Monte Carlo data at 7 TeV collected by the ATLAS collaboration (PYTHIA 6), we examine the necessity of applying the three-negative binomial distribution (T-NBD). By making use of the T-NBD formulation, we analyze the multiplicity distribution (MD) and the Bose–Einstein correlation (BEC) at the Large Hadron Collider (LHC). In the T-NBD framework, the BEC is expressed by two degrees of coherence [Formula: see text] and [Formula: see text] and two kinds of exchange functions [Formula: see text] and [Formula: see text] that act over interaction ranges [Formula: see text] and [Formula: see text], respectively. Using the calculated [Formula: see text] and [Formula: see text] based on the T-NBD, along with free [Formula: see text] and [Formula: see text], we analyze the BEC data at 0.9 and 7 TeV. The estimated parameters [Formula: see text] and [Formula: see text] are almost coincident and seem to be consistent with [Formula: see text] collisions. We also present an enlarged Koba–Nielsen–Olesen (KNO) scaling function based on the T-NBD, and apply it to KNO scaling at LHC energies. The enlarged scaling function describes the observed violation of the KNO scaling.

scholarly journals LHCb detector performance

2015 ◽  
Vol 30 (07) ◽  
pp. 1530022 ◽  
Author(s):  
Keyword(s):  
Hadron Collider ◽  
Lhcb Collaboration ◽  
General Purpose ◽  
Trigger System ◽  
Forward Region ◽  
Detector Performance ◽  
Forward Spectrometer ◽  
Wide Range ◽  
Lhcb Detector ◽  
Using Data

The LHCb detector is a forward spectrometer at the Large Hadron Collider (LHC) at CERN. The experiment is designed for precision measurements of CP violation and rare decays of beauty and charm hadrons. In this paper the performance of the various LHCb sub-detectors and the trigger system are described, using data taken from 2010 to 2012. It is shown that the design criteria of the experiment have been met. The excellent performance of the detector has allowed the LHCb collaboration to publish a wide range of physics results, demonstrating LHCb's unique role, both as a heavy flavour experiment and as a general purpose detector in the forward region.

scholarly journals Multipion Bose-Einstein correlations inpp,p-Pb, and Pb-Pb collisions at energies available at the CERN Large Hadron Collider

2016 ◽  
Vol 93 (5) ◽  
Author(s):  
J. Adam ◽  
D. Adamová ◽  
M. M. Aggarwal ◽  
G. Aglieri Rinella ◽  
M. Agnello ◽  
...  
Keyword(s):  
Large Hadron Collider ◽  
Hadron Collider ◽  
Cern Large Hadron Collider ◽  
Bose Einstein

scholarly journals Bose–Einstein correlation measurements at CMS

2014 ◽  
Vol 931 ◽  
pp. 1061-1065 ◽  
Author(s):  
Sunil Manohar Dogra
Keyword(s):  
Bose Einstein ◽  
Einstein Correlation

scholarly journals CHAOTIC PARAMETER λ IN HANBURY-BROWN–TWISS INTERFEROMETRY IN AN ANISOTROPIC BOSON GAS MODEL

2013 ◽  
Vol 22 (11) ◽  
pp. 1350083 ◽  
Author(s):  
JIE LIU ◽  
PENG RU ◽  
WEI-NING ZHANG ◽  
CHEUK-YIN WONG
Keyword(s):  
Correlation Functions ◽  
Particle Number ◽  
Hadron Collider ◽  
Heavy Ion ◽  
Einstein Condensation ◽  
Bose Einstein Condensation ◽  
Particle Pair ◽  
Average Momentum ◽  
Chaotic Parameter ◽  
Bose Einstein

Using one- and two-body density matrices, we calculate the spatial and momentum distributions, two-particle Hanbury-Brown–Twiss (HBT) correlation functions, and the chaotic parameter λ in HBT interferometry for the systems of boson gas within the harmonic oscillator potentials with anisotropic frequencies in transverse and longitudinal directions. The HBT chaotic parameter, which can be obtained by measuring the correlation functions at zero relative momentum of the particle pair, is related to the degree of Bose–Einstein condensation and thus the system environment. We investigate the effects of system temperature, particle number and the average momentum of the particle pair on the chaotic parameter. The value of λ decreases with the condensed fraction, f0. It is one for f0 = 0 and zero for f0 = 1. For a certain f0 between 0 and 1, we find that λ increases with the average momentum of the particle pair and decreases with the particle number of system. The results of λ are sensitive to the ratio, ν = ωz/ωρ, of the frequencies in longitudinal and transverse directions. They are smaller for larger ν when ωρ is fixed. In the heavy-ion collisions at the Large Hadron Collider (LHC) energy the large identical pion multiplicity may possibly lead to a considerable Bose–Einstein condensation. Its effect on the chaotic parameter in two-pion interferometry is worth considering in earnest.

scholarly journals Large Rapidity Gap Method to Select Soft Diffraction Dissociation at the LHC

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Emily Nurse ◽  
Sercan Sen
Keyword(s):  
Hadron Collider ◽  
Pp Collisions ◽  
Forward Region ◽  
Diffraction Dissociation ◽  
Proton Proton ◽  
Diffractive Dissociation ◽  
Diffractive Process ◽  
Quantum Numbers ◽  
Rapidity Gap ◽  
Zero Degree

In proton-proton (pp) collisions, any process involves exchanging the vacuum quantum numbers is known as diffractive process. A diffractive process with no largeQ2is called soft diffractive process. The diffractive processes are important for understanding nonperturbative QCD effects and they also constitute a significant fraction of the total pp cross section. The diffractive events are typically characterized by a region of the detector without particles, known as a rapidity gap. In order to observe diffractive events in this way, we consider the pseudorapidity acceptance in the forward region of the ATLAS and CMS detectors at the Large Hadron Collider (LHC) and discuss the methods to select soft diffractive dissociation for pp collisions ats=7 TeV. It is shown that, in the limited detector rapidity acceptance, it is possible to select diffractive dissociation events by requiring a rapidity gap in the event; however, without using forward detectors, it seems not possible to fully separate single and double diffractive dissociation events. The Zero Degree Calorimeters can be used to distinguish the type of the diffractive processes up to a certain extent.

scholarly journals Femtoscopic and Nonfemtoscopic Two-Particle Correlations inA+Aandp+pCollisions at RHIC and LHC Energies

2013 ◽  
Vol 2013 ◽  
pp. 1-23 ◽  
Author(s):  
Yu. M. Sinyukov ◽  
S. V. Akkelin ◽  
Iu. A. Karpenko ◽  
V. M. Shapoval
Keyword(s):  
Correlation Function ◽  
Simple Model ◽  
Proton Proton ◽  
Proton Collisions ◽  
Basic Model ◽  
Kaon Interferometry ◽  
Bose Einstein ◽  
Proton Proton Collisions ◽  
Theoretical Results ◽  
Einstein Correlation

The theoretical review of the last femtoscopy results for the systems created in ultrarelativisticA+A,p+p, andp+Pbcollisions is presented. The basic model, allowing to describe the interferometry data at SPS, RHIC, and LHC, is the hydrokinetic model. The model allows one to avoid the principal problem of the particlization of the medium at nonspace-like sites of transition hypersurfaces and switch to hadronic cascade at a space-like hypersurface with nonequilibrated particle input. The results for pion and kaon interferometry scales inPb+PbandAu+Aucollisions at LHC and RHIC are presented for different centralities. The new theoretical results as for the femtoscopy of small sources with sizes of 1-2 fm or less are discussed. The uncertainty principle destroys the standard approach of completely chaotic sources: the emitters in such sources cannot radiate independently and incoherently. As a result, the observed femtoscopy scales are reduced, and the Bose-Einstein correlation function is suppressed. The results are applied for the femtoscopy analysis ofp+pcollisions ats=7 TeV LHC energy andp+Pbones ats=5.02 TeV. The behavior of the corresponding interferometry volumes on multiplicity is compared with what is happening for centralA+Acollisions. In addition the nonfemtoscopic two-pion correlations in proton-proton collisions at the LHC energies are considered, and a simple model that takes into account correlations induced by the conservation laws and minijets is analyzed.

Bose-Einstein correlation of kaons in Si+Au collisions at 14.6AGeV/c

1993 ◽  
Vol 70 (8) ◽  
pp. 1057-1060 ◽  
Author(s):  
Y. Akiba ◽  
D. Beavis ◽  
P. Beery ◽  
H. C. Britt ◽  
B. Budick ◽  
...  
Keyword(s):  
Bose Einstein ◽  
Einstein Correlation
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