Evidence for production of single top quarks and first direct measurement of vertical bar V-tb vertical bar
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
20/05/2014
20/05/2014
04/05/2007
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Resumo |
The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron < p(p)over bar > collider. Using a 0.9 fb(-1) dataset, we apply a multivariate analysis to separate signal from background and measure sigma(< p(p)over bar >-> tb+X,tqb+X)=4.9 +/- 1.4 pb. The probability to measure a cross section at this value or higher in the absence of a signal is 0.035%, corresponding to a 3.4 standard deviation significance. We use the cross section measurement to directly determine the Cabibbo-Kobayashi-Maskawa matrix element that describes the Wtb coupling and find 0.68 <vertical bar V-tb vertical bar <= 1 at 95% C.L. within the standard model. |
Formato |
8 |
Identificador |
http://dx.doi.org/10.1103/PhysRevLett.98.181802 Physical Review Letters. College Pk: American Physical Soc, v. 98, n. 18, 8 p., 2007. 0031-9007 http://hdl.handle.net/11449/23573 10.1103/PhysRevLett.98.181802 WOS:000246210200017 WOS000246210200017.pdf |
Idioma(s) |
eng |
Publicador |
American Physical Soc |
Relação |
Physical Review Letters |
Direitos |
closedAccess |
Tipo |
info:eu-repo/semantics/article |