Measurements of Direct CP Violating Asymmetries in Charmless Decays of Strange Bottom Mesons and Bottom Baryons

Journal Article · Fri May 06 00:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.181802· OSTI ID:21538313

Aaltonen, T; Brucken, E; Devoto, F; Mehtala, P; Orava, R ^[1]; Alvarez Gonzalez, B; Casal, B; Cuevas, J; Gomez, G; Palencia, E; Rodrigo, T; Ruiz, A; Scodellaro, L; Vila, I; Vilar, R; Vizan, J ^[2]; Amerio, S; Dorigo, T; Gresele, A; Lazzizzera, I ^[3]

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1. Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland)
2. Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander (Spain)
3. Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova, Italy (Italy)

We report measurements of direct CP--violating asymmetries in charmless decays of neutral bottom hadrons to pairs of charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using a data sample corresponding to 1 fb{sup -1} of integrated luminosity, we obtain the first measurements of direct CP violation in bottom strange mesons, A{sub CP}(B{sub s}{sup 0}{yields}K{sup -}{pi}{sup +})=+0.39{+-}0.15(stat){+-}0.08(syst), and bottom baryons, A{sub CP}({Lambda}{sub b}{sup 0}{yields}p{pi}{sup -})=+0.03{+-}0.17(stat){+-}0.05(syst) and A{sub CP}({Lambda}{sub b}{sup 0}{yields}pK{sup -})=+0.37{+-}0.17(stat){+-}0.03(syst). In addition, we measure CP violation in B{sup 0}{yields}K{sup +}{pi}{sup -} decays with 3.5{sigma} significance, A{sub CP}(B{sup 0}{yields}K{sup +}{pi}{sup -})=-0.086{+-}0.023(stat){+-}0.009(syst), in agreement with the current world average. Measurements of branching fractions of B{sub s}{sup 0}{yields}K{sup +}K{sup -} and B{sup 0}{yields}{pi}{sup +}{pi}{sup -} decays are also updated.

• OSTI ID: 21538313
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 106; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ASYMMETRY
BARYONS
BEAUTY BARYONS
BEAUTY MESONS
BEAUTY PARTICLES
BOSONS
BRANCHING RATIO
CP INVARIANCE
CYCLIC ACCELERATORS
DECAY
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
FERMILAB TEVATRON
FERMIONS
HADRONS
INVARIANCE PRINCIPLES
KAONS
KAONS MINUS
LUMINOSITY
MESONS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PIONS
PIONS MINUS
PIONS PLUS
PSEUDOSCALAR MESONS
STRANGE MESONS
STRANGE PARTICLES
SYNCHROTRONS