Exploring new physics in the C<inf>7</inf>-C<inf>7</inf>' plane

Sébastien Descotes Genon, Diptimoy Ghosh, Joaquim Matias, Marc Ramon

Research output: Contribution to journalArticleResearchpeer-review

56 Citations (Scopus)

Abstract

The Wilson coefficient C7 governing the radiative electromagnetic decays of B meson has been calculated to a very high accuracy in the Standard Model, but experimental bounds on either the magnitude or the sign of C7 are often model-dependent. In the present paper, we attempt at constraining both the magnitude and sign of C7 using a systematic approach. We consider already measured observables like the branching ratios of B → X sμ+μ- and B → Xs γ , the isospin and CP asymmetries in B → K*γ , as well as AFB and FL in B → K*l+l-. We also discuss the transverse observable A(2)T which, once measured, may help to disentangle some of the scenarios considered. We explore the constraints on C7,C9,C10 as well as their chirality-flipped counterparts. Within our framework, we find that we need to extend the constraints up to 1.6 δ to allow for the "flipped-sign solution" of C7. The SM solution for C7 exhibits a very mild tension if New Physics is allowed in dipole operators only. We provide semi-numerical expressions for all these observables as functions of the relevant Wilson coefficients at the low scale.
Original languageEnglish
Article number099
JournalJournal of High Energy Physics
Volume2011
Issue number6
DOIs
Publication statusPublished - 1 Jan 2011

Keywords

  • B-physics
  • Rare decays

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