Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-05-02
JHEP 1107:067,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 3 fig.; 1 reference and comment on higher order effects added; EOS link fixed. Minor adjustments to Eqs 4.1-4.3 to m
Scientific paper
10.1007/JHEP07(2011)067
We present a systematic analysis of the angular distribution of Bbar -> Kbar^\ast (-> Kbar pi) l^+ l^- decays with l = e, mu in the low recoil region (i.e. at high dilepton invariant masses of the order of the mass of the b-quark) to account model-independently for CP violation beyond the Standard Model, working to next-to-leading order QCD. From the employed heavy quark effective theory framework we identify the key CP observables with reduced hadronic uncertainties. Since some of the CP asymmetries are CP-odd they can be measured without B-flavour tagging. This is particularly beneficial for Bbar_s,B_s -> phi(-> K^+ K^-) l^+ l^- decays, which are not self-tagging, and we work out the corresponding time-integrated CP asymmetries. Presently available experimental constraints allow the proposed CP asymmetries to be sizeable, up to values of the order ~ 0.2, while the corresponding Standard Model values receive a strong parametric suppression at the level of O(10^-4). Furthermore, we work out the allowed ranges of the short-distance (Wilson) coefficients C_9,C_10 in the presence of CP violation beyond the Standard Model but no further Dirac structures. We find the Bbar_s -> mu^+ mu^- branching ratio to be below 9*10^-9 (at 95% CL). Possibilities to check the performance of the theoretical low recoil framework are pointed out.
Bobeth Christoph
Dyk Danny van
Hiller Gudrun
No associations
LandOfFree
More Benefits of Semileptonic Rare B Decays at Low Recoil: CP Violation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with More Benefits of Semileptonic Rare B Decays at Low Recoil: CP Violation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and More Benefits of Semileptonic Rare B Decays at Low Recoil: CP Violation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-427811