Determination of the top-quark pole mass and strong coupling constant from the ttbar production cross section in pp collisions at sqrt(s) = 7 TeV

CMS Collaboration; Basegmez, Suzan; Bruno, Giacomo; Castello, Roberto; Caudron, Adrien; Ceard, Ludivine; Delaere, Christophe; Du Pree, Tristan; Favart, Denis; Forthomme, Laurent; Hollar, Jonathan; Jez, Pavel; Lemaitre, Vincent; Liao, Junhui; Militaru, Otilia; Nuttens, Claude; Pagano, Davide; Pin, Arnaud; Piotrzkowski, Krzysztof; Selvaggi, Michele

doi:10.1016/j.physletb.2014.08.040

Determination of the top-quark pole mass and strong coupling constant from the ttbar production cross section in pp collisions at sqrt(s) = 7 TeV

CMS Collaboration

;

Basegmez, Suzan

;

Bruno, Giacomo

;

Castello, Roberto

;

Quertenmont, Loïc

;et.al.

(2014) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. B728, p. 496-517 (2014)

Files

13071907.pdf

Open Access
Adobe PDF
402.66 KB

Download

Details

Authors

CMS CollaborationUCLouvain
Author
Basegmez, SuzanUCLouvain
Author
Bruno, GiacomoUCLouvain
Author
Castello, RobertoUCLouvain
Author
Caudron, AdrienUCLouvain
Author
Ceard, LudivineUCLouvain
Author
Delaere, ChristopheUCLouvain
Author
Du Pree, TristanUCLouvain
Author
Favart, DenisUCLouvain
Author
Forthomme, LaurentUCLouvain
Author
Hollar, JonathanUCLouvain
Author
Jez, PavelUCLouvain
Author
Lemaitre, VincentUCLouvain
Author
Liao, JunhuiUCLouvain
Author
Militaru, OtiliaUCLouvain
Author
Nuttens, ClaudeUCLouvain
Author
Pagano, DavideUCLouvain
Author
Pin, ArnaudUCLouvain
Author
Piotrzkowski, KrzysztofUCLouvain
Author
Selvaggi, MicheleUCLouvain
Author
Vizan Garcia, Jesús ManuelUCLouvain
Author
Quertenmont, LoïcUCLouvain
Author

Abstract

The inclusive cross section for top-quark pair production measured by the CMS experiment in proton-proton collisions at a center-of-mass energy of 7 TeV is compared to the QCD prediction at next-to-next-to-leading order with various parton distribution functions to determine the top-quark pole mass, $m_t^{pole}$, or the strong coupling constant, $\alpha_S$. With the parton distribution function set NNPDF2.3, a pole mass of 176.7$^{+3.0}_{-2.8}$ GeV is obtained when constraining $\alpha_S$ at the scale of the Z boson mass, $m_Z$, to the current world average. Alternatively, by constraining $m_t^{pole}$ to the latest average from direct mass measurements, a value of $\alpha_S(m_Z)$ = 0.1151$^{+0.0028}_{-0.0027}$ is extracted. This is the first determination of $\alpha_S$ using events from top-quark production.

Affiliations

UCLouvainSST/IRMP - Institut de recherche en mathématique et physique

Citations

APA
Chicago
FWB

CMS Collaboration, Basegmez, S., Bruno, G., Castello, R., Caudron, A., Ceard, L., Delaere, C., Du Pree, T., Favart, D., Forthomme, L., Hollar, J., Jez, P., Lemaitre, V., Liao, J., Militaru, O., Nuttens, C., Pagano, D., Pin, A., Piotrzkowski, K., et al. (2014). Determination of the top-quark pole mass and strong coupling constant from the ttbar production cross section in pp collisions at sqrt(s) = 7 TeV. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, B728, 496-517. https://doi.org/10.1016/j.physletb.2014.08.040 (Original work published 2014)