| Title |
|
|
|
Combined search for the quarks of a sequential fourth generation
| |
| Author |
|
|
|
| |
| Institution/Organisation |
|
|
|
CMS Collaboration
| |
| 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 5 fb(-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 685 GeV is excluded at 95% confidence level for minimal off-diagonal mixing between the third- and the fourth-generation quarks. With a mass difference of 25 GeV between the quark masses, the obtained limit on the masses of the fourth-generation quarks shifts by about +/- 20 GeV. These results significantly reduce the allowed parameter space for a fourth generation of fermions. DOI: 10.1103/PhysRevD.86.112003 | | |
| Language |
|
|
|
English
| |
| Source (journal) |
|
|
|
Physical review : D : particles and fields. - Lancaster, Pa, 1970 - 2003 | |
| Publication |
|
|
|
Lancaster, Pa : 2012
| |
| ISSN |
|
|
|
0556-2821
| |
| Volume/pages |
|
|
|
86:11(2012), p. 1-20
| |
| Article Reference |
|
|
|
112003
| |
| ISI |
|
|
|
000312294500001
| |
| Medium |
|
|
|
E-only publicatie
| |
| Full text (Publisher's DOI) |
|
|
| | |
| Full text (open access) |
|
|
| | |
|