Charming New B-Physics
Autor: | Alexander Lenz, Kirsten Leslie, Sebastian Jäger, Matthew Kirk |
---|---|
Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Physics
Nuclear and High Energy Physics Strange quark Particle physics 010308 nuclear & particles physics Physics beyond the Standard Model High Energy Physics::Phenomenology FOS: Physical sciences Order (ring theory) Observable 01 natural sciences High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) CP violation Operator (computer programming) Mixing (mathematics) Factorization Beyond Standard Model 0103 physical sciences lcsh:QC770-798 lcsh:Nuclear and particle physics. Atomic energy. Radioactivity High Energy Physics::Experiment 010306 general physics |
Zdroj: | Journal of High Energy Physics, Vol 2020, Iss 3, Pp 1-40 (2020) Journal of high energy physics, 2020, Vol.2020(3), pp.122 [Peer Reviewed Journal] Journal of High Energy Physics |
ISSN: | 1126-6708 |
Popis: | We give a comprehensive account of the flavour physics of Beyond-Standard-Model (BSM) effects in $b \to c \bar{c} s$ transitions, considering the full set of 20 four-quark operators. We discuss the leading-order structure of their RG mixing with each other as well as the QCD-penguin, dipole, and FCNC semileptonic operators they necessarily mix with, providing compact expressions. We also provide the first complete results for BSM effects in the lifetime observables $\Delta \Gamma_s$ and $\tau(B_s)/\tau(B_d)$, as well as for the semileptonic CP-asymmetry $a_{sl}^s$. From a global analysis, we obtain stringent constraints on 16 of the 20 BSM operators, including the 10 operators $Q^{c\prime }_{1 \dots 10}$ involving a right-handed strange quark. Focussing on CP-conserving new physics, the constraints correspond to NP scales of order 10 TeV in most cases, always dominated by exclusive and/or radiative $B$-decays via RGE mixing. For the remaining four operators, including the two Standard-Model (SM) ones, larger effects are experimentally allowed, as previously noted in arXiv:1701.09183. We extend that paper's scope to the CP-violating case, paying attention to the impact on the decay rate and time-dependent CP-violation in $B_d \to J/\psi K_S$. We show that quantifiable constraints arise for new physics in either of the two SM operators, with the uncertain non-perturbative matrix element of the colour-suppressed operator determined from the data. For new physics in the SM suppressed coefficient $C^c_1$ we find two perfectly viable, narrow bands of complex Wilson coefficients. Somewhat curiously, one of them contains a region where the fitted matrix element for the colour-suppressed operator is in agreement with naive factorization, contrarily to a widely held belief that large non-factorizable contributions to $B_d \to J/\psi K_S$ are implied by experimental data. Comment: 39 pages, 5 pdf figures, uses jheppub.sty. v2 adds ancillary Mathematica files. v3 matches journal version. v4 Add missing contributions to Gamma12, conclusions unchanged (see JHEP erratum), ancillary file updated |
Databáze: | OpenAIRE |
Externí odkaz: |