Bose-Einstein Correlations in Ee− Annihilations in the Energy Region of the [Gamma]-resonance PDF Download

Author: Gerardo Herrera Corral
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Category :
Languages : en
Pages : 133

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Author: Ivanna Juricic
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Category :
Languages : en
Pages : 348

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Languages : en
Pages : 7

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The authors show that the most popular method to simulate Bose-Einstein (BE) interference effects predicts negligible correlations between identical pions originating from the hadronic decay of different W's produced in ee− --> WW− --> 4 jets at typical linear collider energies.

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Languages : en
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The MARK II detector is used to study the Bose-Einstein correlation between pairs and triplets of charged pions produced in hadronic decays of the J)psi), the .sqrt.s = 4 to 7 GeV continuum above the J)psi), two photon events at .sqrt.s = 29 GeV, and e/sup)plus/)e/sup)minus/) annihilation events at .sqrt.s = 29 GeV as a function of Q2, the four-momentum transfer squared. After corrections for Coulomb effects and pion misidentification, we find a nearly full Bose-Einstein enhancement .cap alpha. in the J)psi) and the two photon data and about half the maximum value in the other two data sets. The radius parameter)tau)(an average over space and time) given by pion pair analyses lies within a band of +-0.10 fm around 0.73 fm and is the same, within errors, for all four data sets. Pion triplet analyses also give a consistent radius of approx. 0.54 fm. fits to two-dimensional distributions R(q/sub T/2, q/sub C/2) of invariant components of Q2 = q/sub T/2)plus) q/sub C/2 give)tau)/sub T/ approx.)tau)C approx.)tau), where q/sub T/ is the transverse three-momentum difference calculated with respect to the net pair three-momentum, and q/sub C/ is in effect the longitudinal three-momentum difference in the pion pair rest frame. When q/sub T/ is calculated with respect to the jet axis for two-jet events in the e/sup)plus/)e/sup)minus/) annihilation data at .sqrt.s = 29 GeV, a fit to R(q/sub T/2, q/sub C/2) also gives)tau)/sub T/ approx.)tau)/sub C/ approx.)tau). Noting that q/sub L/ and q0 are not invariant, we make fits to R(/sub T//sup T/, q/sub L/2) and to R(q/sub T/2, q02) (Kopylov formulation), and we find)tau)0 approx.)tau)/sub L/ approx.)23))tau)/sub T/ to)12))tau)/sub T/. 44 refs., 43 figs., 15 tabs.

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Languages : en
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Measurements of two- and three-particle correlations between like-sign pions produced in ee− annihilation at 29 GeV center-of-mass energy are presented. The analysis is based on data taken during the period 1982--1986 using the TPC/2.gamma. detector at PEP. Two-particle correlations are studied as a function of Q, the momentum difference as measured in the rest frame of the pion pair, and as a function of q0, the energy difference as measured in the lab frame. The Bose-Einstein enhancement is observed when Q is small even when the energy difference, q0, is substantial. This observation provides evidence that the Bose-Einstein correlations are best described by a model that correctly accounts for the relativistic motion of the particle sources. Three-pion correlations are measured both by using a standard three-pion correlation function, and also by using a correlation function for which the correlations between the pairs of pions within the triplet have been subtracted. The observation of three-pion correlations after pair correlations have been subtracted supports the interpretation that the observed correlations are due to Bose-Einstein interference. 56 refs.

Author: Richard M. Weiner
Publisher: John Wiley & Sons
ISBN:
Category : Science
Languages : en
Pages : 272

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The first textbook on Bose-Einstein correlations and their applications, an interdisciplinary topic bridging particle physics and quantum physics, and currently the centre of considerable interest in high energy physics. Besides its fundamental importance for particle physics, this phenomenon constitutes the main tool for the determination of sizes and lifetimes of particle sources. The contents of this book are divided into the following chapters, each of which concludes with exercises designed to test the reader's understanding of the concepts and theories included therein: The Foundations; Hadron Interferometry; Currents; Sources; Applications to Ultrarelativistic Nucleus-Nucleus Collisions; Correlations and Multiplicity Distributions; Photos versus Hadrons. It provides the first systematic analysis and comparison of the different theoretical approaches to the subject and will be invaluable to theorists and experimentalists in particle and nuclear physics, quantum optics and astrophysics.

Author: Robert Ellsworth Avery
Publisher:
ISBN:
Category :
Languages : en
Pages : 290

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Author: Gerardo Herrera Corral
Publisher:
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Category :
Languages : en
Pages : 133

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Author: Jorn Antoine van Dalen
Publisher:
ISBN: 9789090153483
Category :
Languages : en
Pages : 135

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Author: Gerardo Herrera Corral
Publisher:
ISBN:
Category :
Languages : en
Pages : 133

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Book Description