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 → c and b → s flavour changing transitions. In this work, we estimate possible New Physics effects in b → dμ+μ− 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± → π±μ+μ− decays measured recently by the LHCb collaboration. Afterwards, we investigate the impact of these results on other b → d processes such as the leptonic B0 → μ+μ− decays and B0 − \( {\overline{B}}^0 \) mixing. As an example, we consider a simplified Z′ model that is found to be consistent with current b → d data in the certain regions of the NP parameter space. In addition, we estimate the correlations between the partial decay widths of B → πμ+μ− and B → K μ+μ− processes to be used for an independent determination of CKM matrix elements as well as for a combined New Physics analysis of both b → d and b → s transitions.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
A. Khodjamirian, T. Mannel, A.A. Pivovarov and Y.-M. Wang, Charm-loop effect in B → K (∗)ℓ + ℓ− and B → K ∗ γ, JHEP 09 (2010) 089 [arXiv:1006.4945] [INSPIRE].
A. Bharucha, D.M. Straub and R. Zwicky, B → V ℓ + ℓ − in the Standard Model from light-cone sum rules, JHEP 08 (2016) 098 [arXiv:1503.05534] [INSPIRE].
R. Alonso, B. Grinstein and J. Martin Camalich, Lepton universality violation and lepton flavor conservation in B-meson decays, JHEP 10 (2015) 184 [arXiv:1505.05164] [INSPIRE].
A. Greljo, G. Isidori and D. Marzocca, On the breaking of Lepton Flavor Universality in B decays, JHEP 07 (2015) 142 [arXiv:1506.01705] [INSPIRE].
R. Barbieri, G. Isidori, A. Pattori and F. Senia, Anomalies in B-decays and U(2) flavour symmetry, Eur. Phys. J. C 76 (2016) 67 [arXiv:1512.01560] [INSPIRE].
L. Calibbi, A. Crivellin and T. Ota, Effective Field Theory Approach to b → sℓℓ(′) , B → K (∗) \( v\overline{v} \) and B → D(∗) τν with Third Generation Couplings, Phys. Rev. Lett. 115 (2015) 181801 [arXiv:1506.02661] [INSPIRE].
M. Bauer and M. Neubert, Minimal Leptoquark Explanation for the RD(∗), RK, and (g − 2)g Anomalies, Phys. Rev. Lett. 116 (2016) 141802 [arXiv:1511.01900] [INSPIRE].
A. Crivellin, G. D’Ambrosio and J. Heeck, Addressing the LHC flavor anomalies with horizontal gauge symmetries, Phys. Rev. D 91 (2015) 075006 [arXiv:1503.03477] [INSPIRE].
S. Fajfer and N. Košnik, Vector leptoquark resolution of RK and RD(∗) puzzles, Phys. Lett. B 755 (2016) 270 [arXiv:1511.06024] [INSPIRE].
M. Bordone, G. Isidori and A. Pattori, On the Standard Model predictions for RK and RK∗, Eur. Phys. J. C 76 (2016) 440 [arXiv:1605.07633] [INSPIRE].
G. Hiller, D. Loose and K. Schönwald, Leptoquark Flavor Patterns & B Decay Anomalies, JHEP 12 (2016) 027 [arXiv:1609.08895] [INSPIRE].
B. Bhattacharya, A. Datta, J.-P. Guévin, D. London and R. Watanabe, Simultaneous Explanation of the RK and RD(∗) Puzzles: a Model Analysis, JHEP 01 (2017) 015 [arXiv:1609.09078] [INSPIRE].
W. Altmannshofer, P. Stangl and D.M. Straub, Interpreting Hints for Lepton Flavor Universality Violation, Phys. Rev. D 96 (2017) 055008 [arXiv:1704.05435] [INSPIRE].
C. Bobeth, M. Chrzaszcz, D. van Dyk and J. Virto, Long-distance effects in B → K ∗ℓℓ from analyticity, Eur. Phys. J. C 78 (2018) 451 [arXiv:1707.07305] [INSPIRE].
B. Capdevila, A. Crivellin, S. Descotes-Genon, J. Matias and J. Virto, Patterns of New Physics in b → sℓ+ ℓ− transitions in the light of recent data, JHEP 01 (2018) 093 [arXiv:1704.05340] [INSPIRE].
L.-S. Geng, B. Grinstein, S. Jäger, J. Martin Camalich, X.-L. Ren and R.-X. Shi, Towards the discovery of new physics with lepton-universality ratios of b → sℓℓ decays, Phys. Rev. D 96 (2017) 093006 [arXiv:1704.05446] [INSPIRE].
M. Ciuchini et al., On Flavourful Easter eggs for New Physics hunger and Lepton Flavour Universality violation, Eur. Phys. J. C 77 (2017) 688 [arXiv:1704.05447] [INSPIRE].
T. Hurth, F. Mahmoudi, D. Martinez Santos and S. Neshatpour, Lepton nonuniversality in exclusive b→sℓℓ decays, Phys. Rev. D 96 (2017) 095034 [arXiv:1705.06274] [INSPIRE].
D. Ghosh, Explaining the RK and RK* anomalies, Eur. Phys. J. C 77 (2017) 694 [arXiv:1704.06240] [INSPIRE].
A. Datta, J. Kumar, J. Liao and D. Marfatia, New light mediators for the RK and RK* puzzles, Phys. Rev. D 97 (2018) 115038 [arXiv:1705.08423] [INSPIRE].
W. Altmannshofer et al., Light resonances and the low-q2 bin of RK*, JHEP 03 (2018) 188 [arXiv:1711.07494] [INSPIRE].
A. Celis, J. Fuentes-Martin, A. Vicente and J. Virto, Gauge-invariant implications of the LHCb measurements on lepton-flavor nonuniversality, Phys. Rev. D 96 (2017) 035026 [arXiv:1704.05672] [INSPIRE].
G. D’Amico et al., Flavour anomalies after the RK* measurement, JHEP 09 (2017) 010 [arXiv:1704.05438] [INSPIRE].
D. Buttazzo, A. Greljo, G. Isidori and D. Marzocca, B-physics anomalies: a guide to combined explanations, JHEP 11 (2017) 044 [arXiv:1706.07808] [INSPIRE].
L. Di Luzio and M. Nardecchia, What is the scale of new physics behind the B-flavour anomalies?, Eur. Phys. J. C 77 (2017) 536 [arXiv:1706.01868] [INSPIRE].
A. Angelescu, D. Bečirević, D.A. Faroughy and O. Sumensari, Closing the window on single leptoquark solutions to the B-physics anomalies, JHEP 10 (2018) 183 [arXiv:1808.08179] [INSPIRE].
D. Bečirević, I. Doršner, S. Fajfer, N. Košnik, D.A. Faroughy and O. Sumensari, Scalar leptoquarks from grand unified theories to accommodate the B-physics anomalies, Phys. Rev. D 98 (2018) 055003 [arXiv:1806.05689] [INSPIRE].
A. Crivellin, C. Greub, D. Müller and F. Saturnino, Importance of Loop Effects in Explaining the Accumulated Evidence for New Physics in B Decays with a Vector Leptoquark, Phys. Rev. Lett. 122 (2019) 011805 [arXiv:1807.02068] [INSPIRE].
A. Arbey, T. Hurth, F. Mahmoudi and S. Neshatpour, Hadronic and New Physics Contributions to b → s Transitions, Phys. Rev. D 98 (2018) 095027 [arXiv:1806.02791] [INSPIRE].
M. Algueró et al., Emerging patterns of New Physics with and without Lepton Flavour Universal contributions, Eur. Phys. J. C 79 (2019) 714 [Addendum ibid. 80 (2020) 511] [arXiv:1903.09578] [INSPIRE].
A.K. Alok, A. Dighe, S. Gangal and D. Kumar, Continuing search for new physics in b → sμμ decays: two operators at a time, JHEP 06 (2019) 089 [arXiv:1903.09617] [INSPIRE].
M. Ciuchini et al., New Physics in b → sℓ+ ℓ− confronts new data on Lepton Universality, Eur. Phys. J. C 79 (2019) 719 [arXiv:1903.09632] [INSPIRE].
L. Calibbi, A. Crivellin, F. Kirk, C.A. Manzari and L. Vernazza, Z′ models with less-minimal flavour violation, Phys. Rev. D 101 (2020) 095003 [arXiv:1910.00014] [INSPIRE].
K. Kowalska, D. Kumar and E.M. Sessolo, Implications for new physics in b → sμμ transitions after recent measurements by Belle and LHCb, Eur. Phys. J. C 79 (2019) 840 [arXiv:1903.10932] [INSPIRE].
J. Aebischer, W. Altmannshofer, D. Guadagnoli, M. Reboud, P. Stangl and D.M. Straub, B-decay discrepancies after Moriond 2019, Eur. Phys. J. C 80 (2020) 252 [arXiv:1903.10434] [INSPIRE].
A. Arbey, T. Hurth, F. Mahmoudi, D.M. Santos and S. Neshatpour, Update on the b → s anomalies, Phys. Rev. D 100 (2019) 015045 [arXiv:1904.08399] [INSPIRE].
J. Fuentes-Martín, G. Isidori, J. Pagès and K. Yamamoto, With or without U(2)? Probing non-standard flavor and helicity structures in semileptonic B decays, Phys. Lett. B 800 (2020) 135080 [arXiv:1909.02519] [INSPIRE].
P. Arnan, A. Crivellin, M. Fedele and F. Mescia, Generic loop effects of new scalars and fermions in b → sℓ+ ℓ− and a vector-like 4th generation, JHEP 06 (2019) 118 [arXiv:1904.05890] [INSPIRE].
Q. Chang and Y.-D. Yang, The Effects of a Family Non-universal Z′ Boson in the \( {\overline{B}}_s \) → πK, πK∗, ρK Decays and Bd − \( {\overline{B}}_d \) Mixing, Nucl. Phys. B 852 (2011) 539 [arXiv:1010.3181] [INSPIRE].
Q. Chang, X.-Q. Li and Y.-D. Yang, The effects of a family non-universal Z-prime boson on B→pipi decays, Int. J. Mod. Phys. A 26 (2011) 1273 [arXiv:1003.6051] [INSPIRE].
Q. Chang and Y.-H. Gao, Effects of a family non-universal Z′ boson in \( {\overline{B}}_d \) → μ+ μ− and B− → π− μ+ μ− , ρ− μ+ μ− decays, Commun. Theor. Phys. 57 (2012) 234 [INSPIRE].
A. Crivellin, D. Müller and F. Saturnino, Flavor Phenomenology of the Leptoquark Singlet-Triplet Model, JHEP 06 (2020) 020 [arXiv:1912.04224] [INSPIRE].
LHCb collaboration, First observation of the decay B+ → π+ μ+ μ− , JHEP 12 (2012) 125 [arXiv:1210.2645] [INSPIRE].
LHCb collaboration, First measurement of the differential branching fraction and CP asymmetry of the B± → π± μ+ μ− decay, JHEP 10 (2015) 034 [arXiv:1509.00414] [INSPIRE].
C. Hambrock, A. Khodjamirian and A. Rusov, Hadronic effects and observables in B → πℓ+ ℓ− decay at large recoil, Phys. Rev. D 92 (2015) 074020 [arXiv:1506.07760] [INSPIRE].
LHCb collaboration, Study of the rare \( {B}_s^0 \) and B0 decays into the π+ π− μ+ μ− final state, Phys. Lett. B 743 (2015) 46 [arXiv:1412.6433] [INSPIRE].
LHCb collaboration, Observation of the suppressed decay \( {\Lambda}_b^0 \) → pπ− μ+ μ− , JHEP 04 (2017) 029 [arXiv:1701.08705] [INSPIRE].
LHCb collaboration, Evidence for the decay \( {B}_S^0 \) → \( {\overline{K}}^{\ast 0} \) μ+ μ− , JHEP 07 (2018) 020 [arXiv:1804.07167] [INSPIRE].
A. Khodjamirian and A.V. Rusov, Bs → K ℓνℓ and B(s) → π(K)ℓ+ ℓ− decays at large recoil and CKM matrix elements, JHEP 08 (2017) 112 [arXiv:1703.04765] [INSPIRE].
CMS collaboration, Measurement of the \( {B}_s^0 \) → μ+ μ− Branching Fraction and Search for B0 → μ+ μ− with the CMS Experiment, Phys. Rev. Lett. 111 (2013) 101804 [arXiv:1307.5025] [INSPIRE].
CMS and LHCb collaborations, Observation of the rare \( {B}_s^0 \) → μ+ μ− decay from the combined analysis of CMS and LHCb data, Nature 522 (2015) 68 [arXiv:1411.4413] [INSPIRE].
ATLAS collaboration, Study of the rare decays of \( {B}_s^0 \) and B0 into muon pairs from data collected during the LHC Run 1 with the ATLAS detector, Eur. Phys. J. C 76 (2016) 513 [arXiv:1604.04263] [INSPIRE].
ATLAS collaboration, Study of the rare decays of \( {B}_s^0 \) and B0 mesons into muon pairs using data collected during 2015 and 2016 with the ATLAS detector, JHEP 04 (2019) 098 [arXiv:1812.03017] [INSPIRE].
CMS collaboration, Measurement of properties of \( {B}_s^0 \) → μ+ μ− decays and search for B0 → μ+ μ− with the CMS experiment, JHEP 04 (2020) 188 [arXiv:1910.12127] [INSPIRE].
LHCb collaboration, Measurement of the \( {B}_s^0 \) → μ+ μ− branching fraction and effective lifetime and search for B0 → μ+ μ− decays, Phys. Rev. Lett. 118 (2017) 191801 [arXiv:1703.05747] [INSPIRE].
Particle Data Group collaboration, Review of Particle Physics, Phys. Rev. D 98 (2018) 030001 [INSPIRE].
C. Bobeth, M. Gorbahn, T. Hermann, M. Misiak, E. Stamou and M. Steinhauser, Bs,d → l+ l− in the Standard Model with Reduced Theoretical Uncertainty, Phys. Rev. Lett. 112 (2014) 101801 [arXiv:1311.0903] [INSPIRE].
M. Beneke, C. Bobeth and R. Szafron, Enhanced electromagnetic correction to the rare B-meson decay Bs,d → μ+ μ− , Phys. Rev. Lett. 120 (2018) 011801 [arXiv:1708.09152] [INSPIRE].
M. Beneke, C. Bobeth and R. Szafron, Power-enhanced leading-logarithmic QED corrections to Bq → μ+ μ− , JHEP 10 (2019) 232 [arXiv:1908.07011] [INSPIRE].
Flavour Lattice Averaging Group collaboration, FLAG Review 2019: Flavour Lattice Averaging Group (FLAG), Eur. Phys. J. C 80 (2020) 113 [arXiv:1902.08191] [INSPIRE].
L. Di Luzio, M. Kirk and A. Lenz, Updated Bs -mixing constraints on new physics models for b → sℓ+ ℓ− anomalies, Phys. Rev. D 97 (2018) 095035 [arXiv:1712.06572] [INSPIRE].
M. Artuso, G. Borissov and A. Lenz, CP violation in the \( {B}_s^0 \) system, Rev. Mod. Phys. 88 (2016) 045002 [Addendum ibid. 91 (2019) 049901] [arXiv:1511.09466] [INSPIRE].
T. Inami and C.S. Lim, Effects of Superheavy Quarks and Leptons in Low-Energy Weak Processes k(L) → \( \mu \overline{\mu} \), K + → π+ \( v\overline{v} \) and K 0 ↔ \( {\overline{K}}^0 \), Prog. Theor. Phys. 65 (1981) 297 [Erratum ibid. 65 (1981) 1772] [INSPIRE].
A.J. Buras, M. Jamin and P.H. Weisz, Leading and Next-to-leading QCD Corrections to 𝜖 Parameter and B0 − \( {\overline{B}}^0 \) Mixing in the Presence of a Heavy Top Quark, Nucl. Phys. B 347 (1990) 491 [INSPIRE].
HFLAV collaboration, Averages of b-hadron, c-hadron, and τ -lepton properties as of 2018, arXiv:1909.12524 [INSPIRE].
L. Di Luzio, M. Kirk, A. Lenz and T. Rauh, ∆Ms theory precision confronts flavour anomalies, JHEP 12 (2019) 009 [arXiv:1909.11087] [INSPIRE].
A.G. Grozin, R. Klein, T. Mannel and A.A. Pivovarov, B0 − \( {\overline{B}}^0 \) mixing at next-to-leading order, Phys. Rev. D 94 (2016) 034024 [arXiv:1606.06054] [INSPIRE].
A.G. Grozin, T. Mannel and A.A. Pivovarov, Towards a Next-to-Next-to-Leading Order analysis of matching in B0 -\( {\overline{B}}^0 \) mixing, Phys. Rev. D 96 (2017) 074032 [arXiv:1706.05910] [INSPIRE].
A.G. Grozin, T. Mannel and A.A. Pivovarov, B0 -\( {\overline{B}}^0 \) mixing: Matching to HQET at NNLO, Phys. Rev. D 98 (2018) 054020 [arXiv:1806.00253] [INSPIRE].
M. Kirk, A. Lenz and T. Rauh, Dimension-six matrix elements for meson mixing and lifetimes from sum rules, JHEP 12 (2017) 068 [Erratum ibid. 06 (2020) 162] [arXiv:1711.02100] [INSPIRE].
D. King, A. Lenz and T. Rauh, Bs mixing observables and |Vtd /Vts | from sum rules, JHEP 05 (2019) 034 [arXiv:1904.00940] [INSPIRE].
R.J. Dowdall et al., Neutral B-meson mixing from full lattice QCD at the physical point, Phys. Rev. D 100 (2019) 094508 [arXiv:1907.01025] [INSPIRE].
RBC/UKQCD collaboration, SU(3)-breaking ratios for D(s) and B(s) mesons, arXiv:1812.08791 [INSPIRE].
Open Access
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited
Author information
Authors and Affiliations
Corresponding author
Additional information
Publisher’s Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
ArXiv ePrint: 1911.12819
Rights and permissions
Open Access . This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
About this article
Cite this article
Rusov, A.V. Probing New Physics in b → d transitions. J. High Energ. Phys. 2020, 158 (2020). https://doi.org/10.1007/JHEP07(2020)158
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP07(2020)158