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

• Main Authors: Bauer, Gerry P. (Contributor), Gomez-Ceballos, Guillelmo (Contributor), Goncharov, Maxim (Contributor), Makhoul, Khaldoun (Contributor), Paus, Christoph M. E. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2011-09-15T16:54:15Z.
• Subjects: Article
• Online Access: Get fulltext

 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-1 [fb superscript -1] of integrated luminosity, we obtain the first measurements of direct CP violation in bottom strange mesons, ACP(Bs0→K-π+)=+0.39±0.15(stat)±0.08(syst) [A subscript CP (B superscript 0 subscript s → K superscript - pi superscript +)=+0.39±0.15(stat)±0.08(syst)], and bottom baryons, ACP(Λb0→pπ-)=+0.03±0.17(stat)±0.05(syst) [A subscript CP (Lambda superscript 0 subscript b → p pi superscript -) =+0.03±0.17(stat)±0.05(syst)] and ACP(Λb0→pK-)=+0.37±0.17(stat)±0.03(syst) [A subscript CP (Lambda superscript 0 subscript b → pK superscript -) =+0.03±0.17(stat)±0.05(syst)]. In addition, we measure CP violation in B0→K+π- [B superscript 0 → K superscript + pi superscript -] decays with 3.5σ [3.5 delta] significance, ACP(B0→K+π-)=-0.086±0.023(stat)±0.009(syst) [A subscript CP (B superscript 0 → K superscript + pi superscript -) =-0.086±0.023(stat)±0.009(syst)], in agreement with the current world average. Measurements of branching fractions of Bs0→K+K- [B superscript 0 subscript s →K superscript + K superscript - and B0→π+π- [B superscript 0 → pi superscript + pi superscript -] decays are also updated.