Angular distributions of B̄ → Kl̄l decays
By C. Bobeth, G. Hiller, Giorgi Piranishvili. 2007
325 citations recorded by the source corpus.
We model-independently analyze the angular distributions of → Kl decays, l = e,μ, for low dilepton mass using QCD factorization. Besides the decay rate, we study the forward-backward asymmetry AlFB and a further observable, FlH, which gives rise to a flat term in the angular distribution. We find that in the Standard Model FlH∝ml2, hence vanishing FeH and FμH of around 2% (exact value depends on cuts) with a very small theoretical uncertainty of a few percent. We also give predictions for RK, the ratio of → Kμ to → Kēe decay rates. We analytically show using large recoil symmetry relations that in the Standard Model RK equals one up to lepton mass corrections of the order 10−4 including αs and subleading 1/E power corrections. The New Physics reach of the observables from the → Kl angular analysis is explored together with RK and the s → l and → Xsl branching ratios for both l = e and l = μ. We find substantial room for signals from (pseudo-) scalar and tensor interactions beyond the Standard Model. Experimental investigations of the → Kμ angular distributions are suitable for the LHC environment and high luminosity B factories, where also studies of the electron modes are promising.
Subfields: Electrical and Electronic Engineering, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/1459367e10b8e8251a056b6f447c4345604413bb
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In Electrical and Electronic Engineering
In Nuclear and High Energy Physics
- David M. Straub
- Andrzej Buras
- W. Altmannshofer
- S. Descotes-Genon
- T. Hurth
- J. Camalich
- J. Virto
- P. Paradisi
Citations in the corpus
- Implications of LHCb measurements and future prospects - eScholarship (2013, background): “The angular distribution of a B meson decaying to a pseudoscalar meson, P , and a pair of leptons involves just q(2) and a single angle in the dilepton system, θl [77]”
- Model-independent constraints on new physics in b → s transitions (2011, background): “However, once LHCb data onB → K`+`− observables will become available, it will be important to include them given their high NP sensitivity [7, 8].”
- Flavor Physics in the Quark Sector (2009, background): “The decay into a pseudoscalar Kaon, B → Kl+l−, is similar to the decay into a longitudinal vector meson [689, 776].”