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Title: Manual for the Jet Event and Background Simulation Library

Abstract

Jets are the collimated streams of particles resulting from hard scattering in the initial state of high-energy collisions. In heavy-ion collisions, jets interact with the quark-gluon plasma (QGP) before freezeout, providing a probe into the internal structure and properties of the QGP. In order to study jets, background must be subtracted from the measured event, potentially introducing a bias. We aim to understand and quantify this subtraction bias. PYTHIA, a library to simulate pure jet events, is used to simulate a model for a signature with one pure jet (a photon) and one quenched jet, where all quenched particle momenta are reduced by a user-de ned constant fraction. Background for the event is simulated using multiplicity values generated by the TRENTO initial state model of heavy-ion collisions fed into a thermal model consisting of a 3-dimensional Boltzmann distribution for particle types and momenta. Data from the simulated events is used to train a statistical model, which computes a posterior distribution of the quench factor for a data set. The model was tested rst on pure jet events and then on full events including the background. This model will allow for a quantitative determination of biases induced by various methods ofmore » background subtraction.« less

Authors:
 [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1393329
Report Number(s):
LLNL-TR-738295
DOE Contract Number:
AC52-07NA27344
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Heinz, M., Soltz, R., and Angerami, A. Manual for the Jet Event and Background Simulation Library. United States: N. p., 2017. Web. doi:10.2172/1393329.
Heinz, M., Soltz, R., & Angerami, A. Manual for the Jet Event and Background Simulation Library. United States. doi:10.2172/1393329.
Heinz, M., Soltz, R., and Angerami, A. 2017. "Manual for the Jet Event and Background Simulation Library". United States. doi:10.2172/1393329. https://www.osti.gov/servlets/purl/1393329.
@article{osti_1393329,
title = {Manual for the Jet Event and Background Simulation Library},
author = {Heinz, M. and Soltz, R. and Angerami, A.},
abstractNote = {Jets are the collimated streams of particles resulting from hard scattering in the initial state of high-energy collisions. In heavy-ion collisions, jets interact with the quark-gluon plasma (QGP) before freezeout, providing a probe into the internal structure and properties of the QGP. In order to study jets, background must be subtracted from the measured event, potentially introducing a bias. We aim to understand and quantify this subtraction bias. PYTHIA, a library to simulate pure jet events, is used to simulate a model for a signature with one pure jet (a photon) and one quenched jet, where all quenched particle momenta are reduced by a user-de ned constant fraction. Background for the event is simulated using multiplicity values generated by the TRENTO initial state model of heavy-ion collisions fed into a thermal model consisting of a 3-dimensional Boltzmann distribution for particle types and momenta. Data from the simulated events is used to train a statistical model, which computes a posterior distribution of the quench factor for a data set. The model was tested rst on pure jet events and then on full events including the background. This model will allow for a quantitative determination of biases induced by various methods of background subtraction.},
doi = {10.2172/1393329},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 9
}

Technical Report:

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  • Jets are the collimated streams of particles resulting from hard scattering in the initial state of high-energy collisions. In heavy-ion collisions, jets interact with the quark-gluon plasma (QGP) before freezeout, providing a probe into the internal structure and properties of the QGP. In order to study jets, background must be subtracted from the measured event, potentially introducing a bias. We aim to understand and quantify this subtraction bias. PYTHIA, a library to simulate pure jet events, is used to simulate a model for a signature with one pure jet (a photon) and one quenched jet, where all quenched particle momentamore » are reduced by a user-de ned constant fraction. Background for the event is simulated using multiplicity values generated by the TRENTO initial state model of heavy-ion collisions fed into a thermal model consisting of a 3-dimensional Boltzmann distribution for particle types and momenta. Data from the simulated events is used to train a statistical model, which computes a posterior distribution of the quench factor for a data set. The model was tested rst on pure jet events and then on full events including the background. This model will allow for a quantitative determination of biases induced by various methods of background subtraction.« less
  • The Electric Power Research Institute (EPRI) Environmental Subroutine Library, EPRILIB, consists of nine generalized, FORTRAN callable subroutine packages. Packages included are: (1) FTB - dynamic storage allocation, (2) INP - input processing, (3) PLOTMC - multiple curve plotting, (4) Bit Manipulation, (5) Buffered I/O, (6) Extended I/O, (7) System Interrogation, (8) Miscellaneous FORTRAN library extensions, and (9) IFM - Internal File Manager. Separate but equivalent versions of the library are maintained on both CDC NOS, CDC NOS/BE and IBM systems. Use of the library, calling sequences and system dependencies are documented.
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  • The document serves as the operating manual for a dBase III computer listing of 643 articles dealing with the description, development, operation, and performance of electrostatic precipitators (ESPs). These articles were donated to Electric Power Research Institute (EPRI) by the late Mr. H. J. White, a widely known authority on the subject. The listing contains the title and author, citation, list of key words, and a brief abstract for each article.