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Title: Heavy baryons as polarimeters at colliders

Abstract

In new-physics processes that produce b or c jets, a measurement of the initial b or c-quark polarization could provide crucial information about the structure of the new physics. In the heavy-quark limit, the b and c-quark polarizations are preserved in the lightest baryons they hadronize into, Lambda(b) and Lambda(c), respectively. We revisit the prediction for the polarization retention after the hadronization process and extend it to the case of transverse polarization. We show how ATLAS and CMS can measure the b-quark polarization using semileptonic Lambda(b) decays, and the c-quark polarization using Lambda(+)(c) -> pK(-)pi(+) decays. For calibrating both measurements we suggest to use t (t) over bar samples in which these polarizations can be measured with precision of order 10% using 100thfb(-1) of data in Run 2 of the LHC. Measurements of the transverse polarization in QCD events at ATLAS, CMS and LHCb are motivated as well. The proposed measurements give access to nonperturbative QCD parameters relevant to the dynamics of the hadronization process.

Authors:
 [1];  [2];  [3];  [4];  [4];  [5]
  1. Univ. of Rochester, Rochester, NY (United States)
  2. Univ. Catholique de Louvain (Belgium); National Inst. of Chemical Physics and Biophysics, Talinn (Estonia)
  3. Cornell Univ., Ithaca, NY (United States)
  4. Weizmann Inst. of Science, Rehovot (Israel)
  5. Univ. of Cincinnati, OH (United States)
Publication Date:
Research Org.:
Univ. of Rochester, Rochester, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1437948
Grant/Contract Number:  
SC0008475
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2015; Journal Issue: 11; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Galanti, Mario, Giammanco, Andrea, Grossman, Yuval, Kats, Yevgeny, Stamou, Emmanuel, and Zupan, Jure. Heavy baryons as polarimeters at colliders. United States: N. p., 2015. Web. doi:10.1007/JHEP11(2015)067.
Galanti, Mario, Giammanco, Andrea, Grossman, Yuval, Kats, Yevgeny, Stamou, Emmanuel, & Zupan, Jure. Heavy baryons as polarimeters at colliders. United States. doi:10.1007/JHEP11(2015)067.
Galanti, Mario, Giammanco, Andrea, Grossman, Yuval, Kats, Yevgeny, Stamou, Emmanuel, and Zupan, Jure. Tue . "Heavy baryons as polarimeters at colliders". United States. doi:10.1007/JHEP11(2015)067. https://www.osti.gov/servlets/purl/1437948.
@article{osti_1437948,
title = {Heavy baryons as polarimeters at colliders},
author = {Galanti, Mario and Giammanco, Andrea and Grossman, Yuval and Kats, Yevgeny and Stamou, Emmanuel and Zupan, Jure},
abstractNote = {In new-physics processes that produce b or c jets, a measurement of the initial b or c-quark polarization could provide crucial information about the structure of the new physics. In the heavy-quark limit, the b and c-quark polarizations are preserved in the lightest baryons they hadronize into, Lambda(b) and Lambda(c), respectively. We revisit the prediction for the polarization retention after the hadronization process and extend it to the case of transverse polarization. We show how ATLAS and CMS can measure the b-quark polarization using semileptonic Lambda(b) decays, and the c-quark polarization using Lambda(+)(c) -> pK(-)pi(+) decays. For calibrating both measurements we suggest to use t (t) over bar samples in which these polarizations can be measured with precision of order 10% using 100thfb(-1) of data in Run 2 of the LHC. Measurements of the transverse polarization in QCD events at ATLAS, CMS and LHCb are motivated as well. The proposed measurements give access to nonperturbative QCD parameters relevant to the dynamics of the hadronization process.},
doi = {10.1007/JHEP11(2015)067},
journal = {Journal of High Energy Physics (Online)},
number = 11,
volume = 2015,
place = {United States},
year = {2015},
month = {11}
}

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