Abstract
8 páginas, 2 figuras, 1 tabla.-- PACS numbers: 13.25.Hw, 11.30.Er, 14.20.Mr, 14.40.Nd.-- CDF Collaboration: et al.
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 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), and bottom baryons, ACP(Λb0→pπ-)=+0.03±0.17(stat)±0.05(syst) and ACP(Λb0→pK-)=+0.37±0.17(stat)±0.03(syst). In addition, we measure CP violation in B0→K+π- decays with 3.5σ significance, ACP(B0→K+π-)=-0.086±0.023(stat)±0.009(syst), in agreement with the current world average. Measurements of branching fractions of Bs0→K+K- and B0→π+π- decays are also updated.
This work was supported by the U.S. Department of Energy and National Science Foundation; the Italian
Istituto Nazionale di Fisica Nucleare; the Ministry of
Education, Culture, Sports, Science and Technology of
Japan; the Natural Sciences and Engineering Research
Council of Canada; the National Science Council of the
Republic of China; the Swiss National Science
Foundation; the A. P. Sloan Foundation; the
Bundesministerium für Bildung und Forschung,
Germany; the World Class University Program, the
National Research Foundation of Korea; the Science and
Technology Facilities Council and the Royal Society, UK;
the Institut National de Physique Nucleaire et Physique des
Particules/CNRS; the Russian Foundation for Basic
Research; the Ministerio de Ciencia e Innovación, and
Programa Consolider-Ingenio 2010, Spain; the Slovak
R&D Agency; and the Academy of Finland.
Peer reviewed