Michal Kreps
Research Subjects
Michal Kreps has a total of 16 co-authors. Here are the top co-authors by number of shared publications:
- A. Schmidt
Institüt fur Experimentelle Kernphysik, Universität Karslruhe, Karlsruhe, Germany
2 shared publications - C. Liu
University of Pittsburgh, Pittsburgh, U.S.A.
2 shared publications - Elisa Pueschel
Ruhr-Universität Bochum
2 shared publications - F. Azfar
University of Oxford, Oxford, United Kingdom
2 shared publications - G. Gómez-Ceballos
Massachusetts Institute of Technology, Cambridge, U.S.A.
2 shared publications - Gavril Giurgiu
Johns Hopkins University
2 shared publications
Latest Publications
- Open Access
- 30 November 2010
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2010 (11) , 1-18
Formulae for the analysis of the flavor-tagged decay B s 0 → J/ψϕ
- 30 November 2010
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2010 (11) , 1-18
Open AccessFormulae for the analysis of the flavor-tagged decay B s 0 → J/ψϕ
- Open Access
Formulae for the Analysis of the Flavor-Tagged Decay B^0_s --> Jpsi phi
Differential rates in the decay B^0_s --> Jpsi phi, with phi --> K^+K^- and Jpsi --> mu^+ mu^- are sensitive to the CP-violation phase beta_s, predicted to be very small in the standard model. The analysis of B^0_s --> Jpsi phi decays is also suitable for measuring the B^0_s lifetime, the decay width difference DeltaGamma_s between the B^0_s mass eigenstates, and the B^0_s oscillation frequency Delta m even if appreciable CP violation does not occur. In this paper we present normalized probability densities useful in maximum likelihood fits, extended to allow for S-wave contributions on one hand and for the effects of direct CP violation on the other. Our treatment of the S-wave contributions includes the strong variation of the S-wave/P-wave amplitude ratio with m(K^+K^-) across the phi resonance, which was not considered in previous work. We include a scheme for re-normalizing the probability densities after detector sculpting of the angular distributions of the final state particles, and conclude with an examination of the symmetries of the rate formulae, with and without an S-wave contribution. All results are obtained with the use of a new compact formalism describing the differential decay rate of B^0_s mesons into Jpsi phi final states.
Open AccessFormulae for the Analysis of the Flavor-Tagged Decay B^0_s --> Jpsi phi
Differential rates in the decay B^0_s --> Jpsi phi, with phi --> K^+K^- and Jpsi --> mu^+ mu^- are sensitive to the CP-violation phase beta_s, predicted to be very small in the standard model. The analysis of B^0_s --> Jpsi phi decays is also suitable for measuring the B^0_s lifetime, the decay width difference DeltaGamma_s between the B^0_s mass eigenstates, and the B^0_s oscillation frequency Delta m even if appreciable CP violation does not occur. In this paper we present normalized probability densities useful in maximum likelihood fits, extended to allow for S-wave contributions on one hand and for the effects of direct CP violation on the other. Our treatment of the S-wave contributions includes the strong variation of the S-wave/P-wave amplitude ratio with m(K^+K^-) across the phi resonance, which was not considered in previous work. We include a scheme for re-normalizing the probability densities after detector sculpting of the angular distributions of the final state particles, and conclude with an examination of the symmetries of the rate formulae, with and without an S-wave contribution. All results are obtained with the use of a new compact formalism describing the differential decay rate of B^0_s mesons into Jpsi phi final states.
- Open Access
Branching Fractions and Direct CP Asymmetries of Charmless B Decay Modes at CDF
We present new CDF results on the branching fractions and time-integrated direct CP asymmetries for $B^0$ and $B^0_s$ decay modes into pairs of charmless charged hadrons (pions or kaons). The data-set for this update amounts to 1 $\mathrm{fb}^{-1}$ of $p\bar p$ collisions at a center of mass energy 1.96 $\mathrm{TeV}$. We report the first observation of the $B_s \to K^- \pi^+$ mode and a measurement of its branching fraction and direct CP asymmetry. We also observe for the first time two charmless decays of the $\Lambda_b^0$-baryon: $\Lambda_b^0 \to p\pi^-$ and $\Lambda_b^0 \to pK^-$.Open AccessBranching Fractions and Direct CP Asymmetries of Charmless B Decay Modes at CDF
We present new CDF results on the branching fractions and time-integrated direct CP asymmetries for $B^0$ and $B^0_s$ decay modes into pairs of charmless charged hadrons (pions or kaons). The data-set for this update amounts to 1 $\mathrm{fb}^{-1}$ of $p\bar p$ collisions at a center of mass energy 1.96 $\mathrm{TeV}$. We report the first observation of the $B_s \to K^- \pi^+$ mode and a measurement of its branching fraction and direct CP asymmetry. We also observe for the first time two charmless decays of the $\Lambda_b^0$-baryon: $\Lambda_b^0 \to p\pi^-$ and $\Lambda_b^0 \to pK^-$. - Open Access
New Results on X(3872) from CDF
In 2003 the X(3872) particle was discovered by the Belle collaboration. Despite results collected since then, the nature of the state still remains unclear. In this contribution we report on new results on properties of the X(3872) state using data collected with CDF II detector at the Fermilab Tevatron. The dipion mass spectrum and angular distributions are used to determine the $J^{PC}$ quantum numbers of the state.Open AccessNew Results on X(3872) from CDF
In 2003 the X(3872) particle was discovered by the Belle collaboration. Despite results collected since then, the nature of the state still remains unclear. In this contribution we report on new results on properties of the X(3872) state using data collected with CDF II detector at the Fermilab Tevatron. The dipion mass spectrum and angular distributions are used to determine the $J^{PC}$ quantum numbers of the state.