research article
Measurement of the $\Lambda_b$ polarization and angular parameters in $\Lambda_b\to J/\psi, \Lambda$ decays from pp collisions at $\sqrt{s}=$ 7 and 8 TeV
April 18, 2018
An analysis of the bottom baryon decay Λb→J/ψ(→μ+μ-)Λ(→pπ-) is performed to measure the Λb polarization and three angular parameters in data from pp collisions at s=7 and 8 TeV, collected by the CMS experiment at the Large Hadron Collider. The Λb polarization is measured to be 0.00±0.06(stat)±0.06(syst) and the parity-violating asymmetry parameter is determined to be 0.14±0.14(stat)±0.10(syst). The measurements are compared to various theoretical predictions, including those from perturbative quantum chromodynamics.
Type
research article
ArXiv ID
1802.04867
Author(s)
Sirunyan, Albert M
Tumasyan, Armen
Adam, Wolfgang
Ambrogi, Federico
Asilar, Ece
Bergauer, Thomas
Brandstetter, Johannes
Brondolin, Erica
Dragicevic, Marko
Erö, Janos
Date Issued
2018-04-18
Publisher
Published in
Volume
97
Issue
7
Article Number
072010
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Editorial or Peer reviewed
REVIEWED
Written at
OTHER
EPFL units
Available on Infoscience
February 17, 2020
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