Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/5220
Title: Combined search for the quarks of a sequential fourth generation
Authors: CMS Collaboration
Karapınar, Güler
Karapınar, Güler
Keywords: Limits on production of particles
Standard model
Quarks
Issue Date: Dec-2012
Publisher: American Physical Society
Source: Chatrchyan, S, Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Aguilo, E., Bergauer, T., ...CMS Collaboration (2012). Combined search for the quarks of a sequential fourth generation. Physical Review D - Particles, Fields, Gravitation and Cosmology, 86(11). doi:10.1103/PhysRevD.86.112003
Abstract: Results are presented from a search for a fourth generation of quarks produced singly or in pairs in a data set corresponding to an integrated luminosity of 5fb-1 recorded by the CMS experiment at the LHC in 2011. A novel strategy has been developed for a combined search for quarks of the up and down type in decay channels with at least one isolated muon or electron. Limits on the mass of the fourth-generation quarks and the relevant Cabibbo-Kobayashi-Maskawa matrix elements are derived in the context of a simple extension of the standard model with a sequential fourth generation of fermions. The existence of mass-degenerate fourth-generation quarks with masses below 685GeV is excluded at 95% confidence level for minimal off-diagonal mixing between the third- and the fourth-generation quarks. With a mass difference of 25GeV between the quark masses, the obtained limit on the masses of the fourth-generation quarks shifts by about ±20GeV. These results significantly reduce the allowed parameter space for a fourth generation of fermions. © 2012 CERN.
URI: http://doi.org/10.1103/PhysRevD.86.112003
http://hdl.handle.net/11147/5220
ISSN: 1550-7998
1550-2368
Appears in Collections:Mathematics / Matematik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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