TY - GEN
T1 - Measuring quark polarizations at ATLAS and CMS
AU - Kats, Yevgeny
N1 - Funding Information:
I would like to thank the organizers of the LFC17 workshop at ECT* for their invitation to present these ideas and for a stimulating workshop. I am also grateful to Mario Galanti, Andrea Giammanco, Yuval Grossman, Emmanuel Stamou and Jure Zupan for the collaboration on the work that started this research program.
Publisher Copyright:
© 2017 Istituto Nazionale di Fisica Nucleare. All rights reserved.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - Being able to measure the polarization of quarks produced in various processes at the LHC would be of fundamental significance. Measuring the polarizations of quarks produced in new physics processes, once discovered, can provide crucial information about the new physics Lagrangian. In a series of recent papers, we have investigated how quark polarization measurements can be done in practice. The polarizations of heavy quarks (b and c) are expected to be largely preserved in the lightest baryons they hadronize into, the Λb and Λc, respectively. Furthermore, it is known experimentally that s-quark polarization is preserved as well, in Λ baryons. We study how ATLAS and CMS can measure polarizations of b, c and s quarks using certain decays of these baryons. We propose to use the Standard Model tt¯ and Wc samples to calibrate these measurements. We estimate that the Run 2 dataset will suffice for measuring the quark polarizations in these Standard Model samples with precisions of order 10%. We also propose various additional measurements for the near and far future that would help characterize the polarization transfer from the quarks to the baryons.
AB - Being able to measure the polarization of quarks produced in various processes at the LHC would be of fundamental significance. Measuring the polarizations of quarks produced in new physics processes, once discovered, can provide crucial information about the new physics Lagrangian. In a series of recent papers, we have investigated how quark polarization measurements can be done in practice. The polarizations of heavy quarks (b and c) are expected to be largely preserved in the lightest baryons they hadronize into, the Λb and Λc, respectively. Furthermore, it is known experimentally that s-quark polarization is preserved as well, in Λ baryons. We study how ATLAS and CMS can measure polarizations of b, c and s quarks using certain decays of these baryons. We propose to use the Standard Model tt¯ and Wc samples to calibrate these measurements. We estimate that the Run 2 dataset will suffice for measuring the quark polarizations in these Standard Model samples with precisions of order 10%. We also propose various additional measurements for the near and far future that would help characterize the polarization transfer from the quarks to the baryons.
UR - http://www.scopus.com/inward/record.url?scp=85128400430&partnerID=8YFLogxK
M3 - Conference contribution
T3 - Frascati Physics Series
SP - 120
EP - 127
BT - LFC17
A2 - Corcella, Gennaro
A2 - De Curtis, Stefania
A2 - Moretti, Stefano
A2 - Pancheri, Giulia
A2 - Tenchini, Roberto
A2 - Vos, Marcel
PB - Istituto Nazionale di Fisica Nucleare
T2 - 8th Workshop on Old and New Strong Interactions from LHC to Future Colliders, LFC 2017
Y2 - 11 September 2017 through 15 September 2017
ER -