Title
Measurement of top quark polarisation in t-channel single top quark production
Date Issued
01 April 2016
Access level
open access
Resource Type
journal article
Author(s)
The CMS collaboration
Khachatryan V.
Sirunyan A.M.
Tumasyan A.
Adam W.
Asilar E.
Bergauer T.
Brandstetter J.
Brondolin E.
Dragicevic M.
Erö J.
Flechl M.
Friedl M.
Frühwirth R.
Ghete V.M.
Hartl C.
Hörmann N.
Hrubec J.
Jeitler M.
Knünz V.
König A.
Krammer M.
Krätschmer I.
Liko D.
Matsushita T.
Mikulec I.
Rabady D.
Rahbaran B.
Rohringer H.
Schieck J.
Schöfbeck R.
Strauss J.
Treberer-Treberspurg W.
Waltenberger W.
Wulz C.E.
Mossolov V.
Shumeiko N.
Suarez Gonzalez J.
Alderweireldt S.
Cornelis T.
De Wolf E.A.
Janssen X.
Knutsson A.
Lauwers J.
Luyckx S.
Van De Klundert M.
Van Haevermaet H.
Van Mechelen P.
Van Remortel N.
Van Spilbeeck A.
Abu Zeid S.
Blekman F.
D’Hondt J.
Daci N.
De Bruyn I.
Deroover K.
Heracleous N.
Keaveney J.
Lowette S.
Moreels L.
Olbrechts A.
Python Q.
Strom D.
Tavernier S.
Van Doninck W.
Van Mulders P.
Van Onsem G.P.
Van Parijs I.
Barria P.
Brun H.
Caillol C.
Clerbaux B.
De Lentdecker G.
Fasanella G.
Favart L.
Grebenyuk A.
Karapostoli G.
Lenzi T.
Léonard A.
Maerschalk T.
Marinov A.
Perniè L.
Randle-conde A.
Seva T.
Vander Velde C.
Vanlaer P.
Yonamine R.
Zenoni F.
Zhang F.
Beernaert K.
Benucci L.
Cimmino A.
Crucy S.
Dobur D.
Fagot A.
Garcia G.
Gul M.
Mccartin J.
Ocampo Rios A.A.
Poyraz D.
Publisher(s)
Springer Science and Business Media Deutschland GmbH
Abstract
A first measurement of the top quark spin asymmetry, sensitive to the top quark polarisation, in t-channel single top quark production is presented. It is based on a sample of pp collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb−1. A high-purity sample of t-channel single top quark events with an isolated muon is selected. Signal and background components are estimated using a fit to data. A differential cross section measurement, corrected for detector effects, of an angular observable sensitive to the top quark polarisation is performed. The differential distribution is used to extract a top quark spin asymmetry of 0.26 ± 0.03(stat) ± 0.10(syst), which is compatible with a p-value of 4.6% with the standard model prediction of 0.44.
Volume
2016
Issue
4
Language
English
OCDE Knowledge area
Física atómica, molecular y química
Física de partículas, Campos de la Física
Subjects
Scopus EID
2-s2.0-84963893819
Source
Journal of High Energy Physics
ISSN of the container
10298479
Sponsor(s)
National Science Foundation - 1120138, 1151640, 1206044, 1306951, 1314131, 1506130, 1508869.
Seventh Framework Programme - 246806.
Science and Technology Facilities Council - GRIDPP, PP/E000479/1, PP/E002803/1, ST/H000925/1, ST/H000925/2, ST/I000305/1, ST/I003622/1, ST/J004871/1, ST/J005479/1, ST/K001256/1, ST/K001531/1, ST/K001639/1, ST/K003542/1, ST/L005603/1, ST/M002020/1, ST/M004775/1, ST/N000242/1, ST/N000250/1, ST/N001273/1.
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung - 153664.
Sources of information:
Directorio de Producción Científica
Scopus