New physics in : Distinguishing models through CP-violating effects
Mar 27, 201719 pages
Published in:
- Phys.Rev.D 96 (2017) 1, 015034
- Published: Jul 26, 2017
e-Print:
- 1703.09247 [hep-ph]
Report number:
- UDEM-GPP-TH-17-255,
- WSU-HEP-1703
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Abstract: (APS)
At present, there are several measurements of B decays that exhibit discrepancies with the predictions of the SM, and suggest the presence of new physics (NP) in b→sμ+μ- transitions. Many NP models have been proposed as explanations. These involve the tree-level exchange of a leptoquark (LQ) or a flavor-changing Z′ boson. In this paper we examine whether it is possible to distinguish the various models via CP-violating effects in B→K(*)μ+μ-. Using fits to the data, we find the following results. Of all possible LQ models, only three can explain the data, and these are all equivalent as far as b→sμ+μ- processes are concerned. In this single LQ model, the weak phase of the coupling can be large, leading to some sizable CP asymmetries in B→K(*)μ+μ-. There is a spectrum of Z′ models; the key parameter is gLμμ, which describes the strength of the Z′ coupling to μ+μ-. If gLμμ is small (large), the constraints from Bs0-B¯s0 mixing are stringent (weak), leading to a small (large) value of the NP weak phase, and corresponding small (large) CP asymmetries. We therefore find that the measurement of CP-violating asymmetries in B→K(*)μ+μ- can indeed distinguish among NP b→sμ+μ- models.Note:
- 23 pages, 3 figures; references updated; published in Physical Review D
- B: semileptonic decay
- meson: mixing
- Z'
- asymmetry: CP
- CP: violation
- leptoquark: exchange
- neutral current: flavor changing
- statistical analysis
- numerical calculations
- new physics
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