Angular analysis of the B0 → K*0e+e− decay in the low-q2 region

Aaij, R.; Adeva, B.; Adinolfi, M.; Affolder, A.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; artelle, P. CAlvarez; Alves, A. A.; Amato, S.; Amerio, S.; Amhis, Y.; An, L.; Anderlini, L.; Anderson, J.; Andreassen, R.; Andreotti, M.; Andrews, J. E.; Appleby, R. B.; Gutierrez, O. Aquines; Archilli, F.; Artamonov, A.; Artuso, M.; Aslanides, E.; Auriemma, G.; Baalouch, M.; Bachmann, S.; Back, J. J.; Badalov, A.; Baesso, C.; Baldini, W.; Barlow, R. J.; Barschel, C.; Barsuk, S.; Barter, W.; Batozskaya, V.; Battista, V.; Bay, A.; Beaucourt, L.; Beddow, J.; Bedeschi, F.; Bediaga, I.; Belogurov, S.; Belyaev, I.; Ben-Haim, E.; Bencivenni, G.; Benson, S.; Benton, J.; Berezhnoy, A.; Bernet, R.; Bertolin, A.; Bettler, M. O.; Beuzekom, M. van; Bień, A.; Bifani, S.; Bird, T.; Bizzeti, A.; Blake, T.; Blanc, F.; Blouw, J.; Blusk, S.; Bocci, V.; Bondar, A.; Bondar, N.; Bonivento, W.; Borghi, S.; Borgia, A.; Borsato, M.; Bowcock, T. J. 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doi:10.1007/jhep04(2015)064

Cited by 75 publications

(86 citation statements)

References 36 publications

Supporting

Mentioning

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“…These Wilson coefficients are very tightly constrained by the decay B → X s γ, the time dependent CP-asymmetry of B → K Ã γ and the angular analysis of B → K Ã ee a very low q 2 [29,48,49]. 3 It is interesting to note, though, that effects in R K ðÃÞ of leptonspecific contributions to δC l 9 should be enhanced around the mass of resonances (charmoniums at high-q 2 or the ϕ at low-q 2 ) because of the interference effects.…”

Section: Predictions In the Standard Model And In Selected New-pmentioning

confidence: 99%

Towards the discovery of new physics with lepton-universality ratios of b→sℓℓ decays

et al. 2017

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Tests of lepton-universality as rate ratios in b → sll transitions can be predicted very accurately in the Standard Model. The deficits with respect to expectations reported by the LHCb experiment in muon-toelectron ratios of the B → K ðÃÞ ll decay rates thus point to genuine manifestations of lepton nonuniversal new physics. In this paper, we analyze these measurements in the context of effective field theory. First, we discuss the interplay of the different operators in R K and R K Ã and provide predictions for R K Ã in the Standard Model and in new-physics scenarios that can explain R K . We also provide approximate numerical formulas for these observables in bins of interest as functions of the relevant Wilson coefficients. Secondly, we perform frequentist fits to R K and R K Ã . The Standard Model disagrees with these measurements at 3.7σ significance. We find excellent fits in scenarios with combinations ofwith pulls relative to the Standard Model in the region of 4σ. An important conclusion of our analysis is that a lepton-specific contribution to O 10 is important to understand the data. Under the hypothesis that new-physics couples selectively to the muons, we also present fits to other b → sμμ data with a conservative error assessment and comment on more general scenarios. Finally, we discuss new lepton universality ratios that, if new physics is the origin of the observed discrepancy, should contribute to the statistically significant discovery of new physics in the near future.

show abstract

Section: Predictions In the Standard Model And In Selected New-pmentioning

confidence: 99%

Towards the discovery of new physics with lepton-universality ratios of b→sℓℓ decays

et al. 2017

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show abstract

“…The angular analysis of B 0 → K * 0 + − [63] at much lower momentum transfer (q 2 1 GeV 2 ) can also provide strong constraints, specifically on the coefficients C ( )…”

mentioning

confidence: 99%

FlavBit: a GAMBIT module for computing flavour observables and likelihoods

Bernlochner¹,

Chrząszcz²,

Dal³

et al. 2017

Eur. Phys. J. C

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Flavour physics observables are excellent probes of new physics up to very high energy scales. Here we present FlavBit, the dedicated flavour physics module of the globalfitting package GAMBIT. FlavBit includes custom implementations of various likelihood routines for a wide range of flavour observables, including detailed uncertainties and correlations associated with LHCb measurements of rare, leptonic and semileptonic decays of B and D mesons, kaons and pions. It provides a generalised interface to external theory codes such as SuperIso, allowing users to calculate flavour observables in and beyond the Standard Model, and then test them in detail against all relevant experimental data. We describe FlavBit and its constituent physics in some detail, then give examples from supersymmetry and effective field theory illustrating how it can be used both as a standalone library for flavour physics, and within GAMBIT.

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“…The most sensitive measurement comes from the LHCb experiment using B 0 → K * 0 e + e − decays [241]. In the Run 1 dataset LHCb measures A (2) T = −0.23 ± 0.23 stat ± 0.05 syst , which is consistent with zero and pure left-hand polarisation.…”

Section: Angular Distribution Of B → Vmentioning

confidence: 83%

“…LHCb [241,242] ABBBSW [232] DHMV [239] Table 5: Conventions for B → V + − angular observables used in the literature, relative to the conventions used by the LHCb collaboration. The table should be interpreted such that, for instance, P 4 | LHCb = − 1 2 P 4 | DHMV .…”

Section: Angular Distribution Of B → Vmentioning

confidence: 99%

Rare B decays as tests of the Standard Model

Blake

Lanfranchi

Straub

2017

Progress in Particle and Nuclear Physics

120

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One of the most interesting puzzles in particle physics today is that new physics is expected at the TeV energy scale to solve the hierarchy problem, and stabilise the Higgs mass, but so far no unambiguous signal of new physics has been found. Strong constraints on the energy scale of new physics can be derived from precision tests of the electroweak theory and from flavour-changing or CP -violating processes in strange, charm and beauty hadron decays. Decays that proceed via flavour-changing-neutral-current processes are forbidden at the lowest perturbative order in the Standard Model and are, therefore, rare. Rare b hadron decays are playing a central role in the understanding of the underlying patterns of Standard Model physics and in setting up new directions in model building for new physics contributions. In this article the status and prospects of this field are reviewed.

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Angular analysis of the B0 → K*0e+e− decay in the low-q2 region

Cited by 75 publications

References 36 publications

Towards the discovery of new physics with lepton-universality ratios of b→sℓℓ decays

Towards the discovery of new physics with lepton-universality ratios of b→sℓℓ decays

FlavBit: a GAMBIT module for computing flavour observables and likelihoods

Rare B decays as tests of the Standard Model

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