Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/1883
Título: New physics contributions to A(FB)(t(t)over-bar) at the Tevatron
Autor: Biswal, Sudhansu S.
Mitra, Subhadip
Santos, Rui
Sharma, Pankaj
Singh, Ritesh K.
Won, Miguel
Palavras-chave: Forward-Backward Asymmetry
Single-Top Production
Quark
Search
Collisions
Data: 18-Jul-2012
Editora: Amer Physical Soc
Citação: Biswal S S, Mitra S, Santos R, Sharma P, Singh R K, Won M. New physics contributions to A(FB)(t(t)over-bar) at the Tevatron. Physical Review D. 2012; 1 (86).
Relatório da Série N.º: ;014016
Resumo: The Tevatron has measured a discrepancy relative to the standard model prediction in the forward-backward asymmetry in top quark pair production. This asymmetry grows with the rapidity difference of the two top quarks. It also increases with the invariant mass of the t (t) over bar pair, reaching, for high invariant masses, 3.4 standard deviations above the next-to-leading order prediction for the charge asymmetry of QCD. However, perfect agreement between experiment and the standard model was found in both total and differential cross section of top quark pair production. As this result could be a sign of new physics we have parametrized this new physics in terms of a complete set of dimension six operators involving the top quark. We have then used a Markov chain Monte Carlo approach in order to find the best set of parameters that fits the data, using all available data regarding top quark pair production at the Tevatron. We have found that just a very small number of operators are able to fit the data better than the standard model.
Peer review: yes
URI: http://hdl.handle.net/10400.21/1883
ISSN: 1550-7998
Aparece nas colecções:ISEL - Física - Artigos

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