Engineering topics

Rama, M.

Publications and source records attributed to Rama, M..

7 records

DOE OSTI2021

Averages of b-hadron, c-hadron, and $$\tau $$-lepton properties as of 2018: Heavy Flavor Averaging Group (HFLAV)

Abstract This paper reports world averages of measurements of b -hadron, c -hadron, and $$\tau $$ τ -lepton properties obtained by the Heavy Flavour Averaging Group using results available through September 2018. In rare cases, significant results obtained several months later are also used. For the averaging, common input parameters used in the various analyses are adjusted (rescaled) to common values, and known correlations are taken into account. The averages include branching fractions, lifetimes, neutral meson mixing parameters, $$C\!P$$ C P violation parameters, parameters of semileptonic decays, and Cabibbo–Kobayashi–Maskawa matrix elements.

Amhis, Y. (ORCID:0000000342821512)↗

DOE OSTI2017

Evidence for C P violation in B + → K * ( 892 ) + π 0 from a Dalitz plot analysis of B + → K S 0 π + π 0 decays

We report a Dalitz plot analysis of charmless hadronic decays of charged B mesons to the final state K 0 S π + π 0 using the full BABAR data set of 470.9 ± 2.8 million B¯B events collected at the Υ(4S) resonance. We measure the overall branching fraction and CP asymmetry to be B(B + → K 0 π + π 0 ) = (31.8 ± 1.8 ± 2.1 +6.0 –0.0 ) × 10 –6 and A CP (B + → K 0 π + π 0 ) = 0.07 ± 0.05 ± 0.03 +0.02 –0.03 , where the uncertainties are statistical, systematic, and due to the signal model, respectively. This is the first measurement of the branching fraction for B + → K 0 π + π 0 . We find first evidence of a CP asymmetry in B + → K*(892) + π 0 decays: A CP (B + → K*(892) + π 0 ) = –0.52 ± 0.14 ± 0.04 +0.04 –0.02 . The significance of this asymmetry, including systematic and model uncertainties, is 3.4 standard deviations. As a result, we also measure the branching fractions and CP asymmetries for three other intermediate decay modes.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗

DOE OSTI2016