Probing New Physics in $b\to d$ Transitions

Abstract

Recent experimental data on several observables in semileptonic $B$-meson decays are found to be in tension with the corresponding Standard Model predictions. Most of these deviations are related to $b\to c$ and $b\to s$ flavour changing transitions. In this work, we estimate possible New Physics effects in $b\to d{\mu }^{+}{\mu }^{-}$ flavour changing neutral currents. We parametrize NP contributions in a model-independent way and determine the allowed ranges of corresponding Wilson coefficients from the data on the exclusive $B^{\pm }\to {\pi }^{\pm }{\mu }^{+}{\mu }^{-}$ decays measured recently by the LHCb collaboration. Afterwards, we investigate the impact of these results on other $b\to d$ processes such as the leptonic $B^0\to {\mu }^{+}{\mu }^{-}$ decays and $B^0-{\bar{B}}^0$ mixing. As an example, we consider a simplified $Z^{\prime }$ model that is found to be consistent with current $b\to d$ data in the certain regions of the NP parameter space. In addition, we estimate the correlations between the partial decay widths of $B\to \pi {\mu }^{+}{\mu }^{-}$ and $B\to K{\mu }^{+}{\mu }^{-}$ processes to be used for an independent determination of CKM matrix elements as well as for a combined New Physics analysis of both $b\to d$ and $b\to s$ transitions.

arXiv comment16 pages, 3 figures, 1 table. Slightly modified version, published in JHEP

References in corpus (48)

• FLAG Review 2019
• $B\to V{\ell }^{+}{\ell }^{-}$ in the Standard Model from Light-Cone Sum Rules
• Observation of the rare $B_s^0\to {\mu }^{+}{\mu }^{-}$ decay from the combined analysis of CMS and LHCb data
• B_{s,d} -> l+ l- in the Standard Model with Reduced Theoretical Uncertainty
• B-physics anomalies: a guide to combined explanations
• One Leptoquark to Rule Them All: A Minimal Explanation for $R_{D^{(\ast )}}$, $R_K$ and $(g-2{)}_{\mu }$
• On the Standard Model predictions for $R_K$ and $R_{K^{\ast }}$
• Charm-loop effect in $B\to K^{(\ast )}{\ell }^{+}{\ell }^{-}$ and $B\to K^{\ast }\gamma$
• Effective field theory approach to $b\to s\ell {\ell }^{(\prime )}$, $B\to K^{(\ast )}\nu \bar{\nu }$ and $B\to D^{(\ast )}\tau \nu$ with third generation couplings
• Patterns of New Physics in $b\to s{\ell }^{+}{\ell }^{-}$ transitions in the light of recent data
• Anomalies in $B$-decays and $U(2)$ flavour symmetry
• Vector leptoquark resolution of $R_K$ and $R_{D^{(\ast )}}$ puzzles
• Flavour anomalies after the $R_{K^{\ast }}$ measurement
• Closing the window on single leptoquark solutions to the $B$-physics anomalies
• B-decay discrepancies after Moriond 2019
• Importance of Loop Effects in Explaining the Accumulated Evidence for New Physics in B Decays with a Vector Leptoquark
• Scalar leptoquarks from GUT to accommodate the $B$-physics anomalies
• Simultaneous Explanation of the $R_K$ and $R_{D^{(\ast )}}$ Puzzles: a Model Analysis
• Power-enhanced leading-logarithmic QED corrections to $B_q\to {\mu }^{+}{\mu }^{-}$
• Leptoquark Flavor Patterns & B Decay Anomalies
• $\Delta M_s$ theory precision confronts flavour anomalies
• What is the scale of new physics behind the $B$-flavour anomalies?
• Long-distance effects in $B\to K^{\ast }\ell \ell$ from Analyticity
• Neutral B-meson mixing from full lattice QCD at the physical point
• New Physics in $b\to s{\ell }^{+}{\ell }^{-}$ confronts new data on Lepton Universality
• Enhanced electromagnetic correction to the rare $B$-meson decay $B_{s,d}\to {\mu }^{+}{\mu }^{-}$
• Continuing search for new physics in $b\to s\mu \mu$ decays: two operators at a time
• Bs mixing observables and Vtd/Vts from sum rules
• Update on the b->s anomalies
• Gauge-invariant implications of the LHCb measurements on Lepton-Flavour Non-Universality
• One constraint to kill them all?
• With or without U(2)? Probing non-standard flavor and helicity structures in semileptonic B decays
• Generic Loop Effects of New Scalars and Fermions in $b\to s{\ell }^{+}{\ell }^{-}$, $(g-2{)}_{\mu }$ and a Vector-like $4^{\mathrm{th}}$ Generation
• Explaining the $R_K$ and $R_{K^{\ast }}$ anomalies
• $B_s\to K\ell {\nu }_{\ell }$ and $B_{(s)}\to \pi (K){\ell }^{+}{\ell }^{-}$ decays at large recoil and CKM matrix elements
• On lepton non-universality in exclusive $b\to s\ell \ell$ decays
• Dimension-six matrix elements for meson mixing and lifetimes from sum rules
• New light mediators for the $R_K$ and $R_{K^{\ast }}$ puzzles
• Implications for New Physics in $b\to s\mu \mu$ transitions after recent measurements by Belle and LHCb
• Hadronic and New Physics Contributions to $b\to s$ Transitions
• $Z^{\prime }$ models with less-minimal flavour violation
• Hadronic effects and observables in $B\to \pi {\ell }^{+}{\ell }^{-}$ decay at large recoil
• Light Resonances and the Low-$q^2$ Bin of $R_{K^{\ast }}$
• $B^0-{\bar{B}}^0$ Mixing at Next-to-Leading Order
• Towards a Next-to-Next-to-Leading Order analysis of matching in $B^0$-${\bar{B}}^0$ mixing
• $B^0$-${\bar{B}}^0$ mixing: matching to HQET at NNLO
• The Effects of a Family Non-universal Z' Boson in the \bar{B}_s->πK, πK*, ρK Decays and B_d-\bar{B_d} mixing
• The effects of a family non-universal Z-prime boson on B--->pipi decays

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• Interplay of dineutrino modes with semileptonic rare $\mathbf{B}$-decays
• Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review
• Model-independent analysis of $b\to d$ processes
• Probing flavor constrained SMEFT operators through $tc$ production at the Muon collider
• Maximising the physics potential of $B^{\pm }\to {\pi }^{\pm }{\mu }^{+}{\mu }^{-}$ decays