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Measurements of $t\overline{t}$ Spin Correlations and Top-Quark Polarization Using Dilepton Final States in $pp$ Collisions at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$


CMS Collaboration; Chatrchyan, S; Khachatryan, V; Sirunyan, A M; et al; Chiochia, V; Kilminster, B; Robmann, P (2014). Measurements of $t\overline{t}$ Spin Correlations and Top-Quark Polarization Using Dilepton Final States in $pp$ Collisions at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$. Physical Review Letters, 112(182001):online.

Abstract

Spin correlations and polarization in the top quark–antiquark system are measured using dilepton final states produced in $\text{pp}$ collisions at the LHC at $\sqrt{s}$ = 7 $\text{TeV}$. The data correspond to an integrated luminosity of $\text{5.0}$ $\text{f}b^{-1}$ collected with the CMS detector. The measurements are performed using events with two oppositely charged leptons (electrons or muons), a significant imbalance in transverse momentum, and two or more jets, where at least one of the jets is identified as originating from a b quark. The spin correlations and polarization are measured through asymmetries in angular distributions of the two selected leptons, unfolded to the parton level. All measurements are found to be in agreement with predictions of the standard model.

Abstract

Spin correlations and polarization in the top quark–antiquark system are measured using dilepton final states produced in $\text{pp}$ collisions at the LHC at $\sqrt{s}$ = 7 $\text{TeV}$. The data correspond to an integrated luminosity of $\text{5.0}$ $\text{f}b^{-1}$ collected with the CMS detector. The measurements are performed using events with two oppositely charged leptons (electrons or muons), a significant imbalance in transverse momentum, and two or more jets, where at least one of the jets is identified as originating from a b quark. The spin correlations and polarization are measured through asymmetries in angular distributions of the two selected leptons, unfolded to the parton level. All measurements are found to be in agreement with predictions of the standard model.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2014
Deposited On:19 Feb 2014 08:03
Last Modified:05 Apr 2016 17:37
Publisher:American Physical Society
ISSN:0031-9007
Publisher DOI:https://doi.org/10.1103/PhysRevLett.112.182001

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