First Observation of B̅ s0→Ds±K∓ and Measurement of the Ratio of Branching Fractions B(B̅ s0→Ds±K∓)/B(B̅ s0→Ds+π-)


Autoria(s): Aaltonen, Timo; Mehtälä, Petteri; Orava, Risto; Mäki, Tuula; Saarikko, Heimo; Österberg, Kenneth; CDF Collaboration
Contribuinte(s)

University of Helsinki, Department of Physics

University of Helsinki, Department of Physics

University of Helsinki, Department of Physics

University of Helsinki, Helsinki Institute of Physics

University of Helsinki, Department of Physics

University of Helsinki, Department of Physics

Data(s)

2009

Resumo

A combined mass and particle identification fit is used to make the first observation of the decay Bs --> Ds K and measure the branching fraction of Bs --> Ds K relative to Bs --> Ds pi. This analysis uses 1.2 fb^-1 integrated luminosity of pbar-p collisions at sqrt(s) = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron collider. We observe a Bs --> Ds K signal with a statistical significance of 8.1 sigma and measure Br(Bs --> Ds K)/Br(Bs --> Ds pi) = 0.097 +- 0.018(stat) +- 0.009(sys).

Formato

7

Identificador

http://hdl.handle.net/10138/24416

0031-9007

Idioma(s)

eng

Publicador

American Institute of Physics

Relação

Physical Review Letters

Fonte

Aaltonen , T , Mehtälä , P , Orava , R , Mäki , T , Saarikko , H , Österberg , K & CDF Collaboration 2009 , ' First Observation of B̅ s0→Ds±K∓ and Measurement of the Ratio of Branching Fractions B(B̅ s0→Ds±K∓)/B(B̅ s0→Ds+π-) ' Physical Review Letters , vol 103 , no. 19 , pp. 191802 . , 10.1103/PhysRevLett.103.191802

Palavras-Chave #114 Physical sciences #hep-ex
Tipo

A1 Refereed journal article

info:eu-repo/semantics/article