Search for same-sign top-quark pair production at √s = 7 TeV and limits on avour changing neutral currents in the top sector


Chatrchyan S., Khachatryan V., Sirunyan A., Tumasyan A., Adam W., Bergauer T., ...Daha Fazla

Journal of High Energy Physics, cilt.2011, sa.8, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 2011 Sayı: 8
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1007/jhep08(2011)005
  • Dergi Adı: Journal of High Energy Physics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Hadron-Hadron Scattering
  • Yıldız Teknik Üniversitesi Adresli: Hayır

Özet

An inclusive search for same-sign top-quark pair production in pp collisions at √s = 7TeV is performed using a data sample recorded with the CMS detector in 2010, corresponding to an integrated luminosity of 35 pb -1. This analysis is motivated by recent studies of pp → tt reporting mass-dependent forward-backward asymmetries larger than expected from the standard model. These asymmetries could be due to Flavor Changing Neutral Currents (FCNC) in the top sector induced by t-channel exchange of a massive neutral vector boson (Z'). Models with such a Z' also predict enhancement of same-sign top-pair production in pp or pp collisions. Limits are set as a function of the Z' mass and its couplings to u and t quarks. These limits disfavour the FCNC interpretation of the Tevatron results. © SISSA 2011.