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Title: Event-by-Event Study of Space-Time Dynamics in Flux-Tube Fragmentation

Abstract

In the semi-classical description of the flux-tube fragmentation process for hadron production and hadronization in high-energy $e^+e^-$ annihilations and $pp$ collisions, the rapidity-space-time ordering and the local conservation laws of charge, flavor, and momentum provide a set of powerful tools that may allow the reconstruction of the space-time dynamics of quarks and mesons in exclusive measurements of produced hadrons, on an event-by-event basis. We propose procedures to reconstruct the space-time dynamics from event-by-event exclusive hadron data to exhibit explicitly the ordered chain of hadrons produced in a flux tube fragmentation. As a supplementary tool, we infer the average space-time coordinates of the $q$-$$\bar q$$ pair production vertices from the $$\pi^-$$ rapidity distribution data obtained by the NA61/SHINE Collaboration in $pp$ collisions at $$\sqrt{s}$$ = 6.3 to 17.3 GeV.

Authors:
 [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1360021
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Physics. G, Nuclear and Particle Physics
Additional Journal Information:
Journal Volume: 44; Journal Issue: 7; Journal ID: ISSN 0954-3899
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Wong, Cheuk-Yin. Event-by-Event Study of Space-Time Dynamics in Flux-Tube Fragmentation. United States: N. p., 2017. Web. doi:10.1088/1361-6471/aa6fdb.
Wong, Cheuk-Yin. Event-by-Event Study of Space-Time Dynamics in Flux-Tube Fragmentation. United States. doi:10.1088/1361-6471/aa6fdb.
Wong, Cheuk-Yin. Thu . "Event-by-Event Study of Space-Time Dynamics in Flux-Tube Fragmentation". United States. doi:10.1088/1361-6471/aa6fdb.
@article{osti_1360021,
title = {Event-by-Event Study of Space-Time Dynamics in Flux-Tube Fragmentation},
author = {Wong, Cheuk-Yin},
abstractNote = {In the semi-classical description of the flux-tube fragmentation process for hadron production and hadronization in high-energy $e^+e^-$ annihilations and $pp$ collisions, the rapidity-space-time ordering and the local conservation laws of charge, flavor, and momentum provide a set of powerful tools that may allow the reconstruction of the space-time dynamics of quarks and mesons in exclusive measurements of produced hadrons, on an event-by-event basis. We propose procedures to reconstruct the space-time dynamics from event-by-event exclusive hadron data to exhibit explicitly the ordered chain of hadrons produced in a flux tube fragmentation. As a supplementary tool, we infer the average space-time coordinates of the $q$-$\bar q$ pair production vertices from the $\pi^-$ rapidity distribution data obtained by the NA61/SHINE Collaboration in $pp$ collisions at $\sqrt{s}$ = 6.3 to 17.3 GeV.},
doi = {10.1088/1361-6471/aa6fdb},
journal = {Journal of Physics. G, Nuclear and Particle Physics},
number = 7,
volume = 44,
place = {United States},
year = {Thu May 25 00:00:00 EDT 2017},
month = {Thu May 25 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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  • We present a sophisticated treatment of the hydrodynamic evolution of ultrarelativistic heavy ion collisions, based on the following features: initial conditions obtained from a flux tube approach, compatible with the string model and the color glass condensate picture; an event-by-event procedure, taking into the account the highly irregular space structure of single events, being experimentally visible via so-called ridge structures in two-particle correlations; the use of an efficient code for solving the hydrodynamic equations in 3+1 dimensions, including the conservation of baryon number, strangeness, and electric charge; the employment of a realistic equation of state, compatible with lattice gauge results;more » the use of a complete hadron resonance table, making our calculations compatible with the results from statistical models; and a hadronic cascade procedure after hadronization from the thermal matter at an early time.« less
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  • The production of quark-antiquark pairs along a color flux tube precedes the fragmentation of the tube. Because of the local conservation of momentum and charge, the production of amore » $q$-$$\bar q$$ pair will lead to correlations of adjacently produced mesons (mostly pions). Adjacently produced pions however can be signalled by the their rapidity difference $$\Delta y$$ falling within the window of $$|\Delta y | < 1/(dN_\pi/dy)$$, on account of the space-time-rapidity ordering of produced pions in a flux tube fragmentation. Therefore, the local conservation of momentum will lead to a suppression of azimuthal two-pion correlation $$dN/(d\Delta \phi\, d\Delta y)$$ on the near side at $$(\Delta \phi, \Delta y) \sim 0$$, but an enhanced azimuthal correlation on the back-to-back, away side at $$(\Delta \phi$$$\sim$$$ \pi,\Delta y$$$\sim$$0). Similarly, in a flux tube fragmentation, the local conservation of charge will forbid the production of like charge pions within $$|\Delta y | < 1/(dN_\pi/dy)$$, but there is no such prohibition for $$|\Delta y| >1/(dN_\pi/dy)$$. These properties may be used as the signature for the fragmentation of a color flux tube.« less
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