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Charles, Jérôme

doi:10.1103/physrevd.59.054007

Cited by 81 publications

(11 citation statements)

References 52 publications

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“…Although the method allows a full determination of the weak phase and of the relevant hadronic parameters, it suffers from discrete ambiguities that limit its constraining power. It is however possible to reduce the impact of discrete ambiguities by adding information on hadronic parameters [351,352]. In particular, as noted in Refs.…”

Section: Measurements Of γ Using Loop-mediated Two-body B Decaysmentioning

confidence: 99%

Implications of LHCb measurements and future prospects

Bharucha¹,

Bigi²,

Bobeth³

et al. 2013

Eur. Phys. J. C

171

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region at a hadron collider. This document discusses the implications of these first measurements on classes of extensions to the Standard Model, bearing in mind the interplay with the results of searches for on-shell production of new particles at ATLAS and CMS. The physics potential of an upgrade to the LHCb detector, which would allow an order of magnitude more data to be collected, is emphasised.

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Section: Measurements Of γ Using Loop-mediated Two-body B Decaysmentioning

confidence: 99%

Implications of LHCb measurements and future prospects

Bharucha¹,

Bigi²,

Bobeth³

et al. 2013

Eur. Phys. J. C

171

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mentioning

confidence: 99%

Testing the standard model and searching for new physics with B d → ππ and B s → KK decays

Ciuchini

Franco

Mishima

et al. 2012

J. High Energ. Phys.

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We propose to perform a combined analysis of B → ππ and Bs → K + K − modes, in the framework of a global CKM fit. The method optimizes the constraining power of these decays and allows to derive constraints on NP contributions to penguin amplitudes or on the Bs mixing phase. We illustrate these capabilities with a simplified analysis using the recent measurements by the LHCb Collaboration, neglecting correlations with other SM observables.CP violation in B d,s decays plays a fundamental role in testing the consistency of the Cabibbo-Kobayashi-Maskawa (CKM) paradigm in the Standard Model (SM) and in probing virtual effects of heavy new particles. With the advent of the B-factories, the Gronau-London (GL) isospin analysis of B d → ππ decays [1] has been a precious source of information on the phase of the CKM matrix. Although the method allows a full determination of the weak phase and of the relevant hadronic parameters, it suffers from discrete ambiguities that limit its constraining power. It is however possible to reduce the impact of discrete ambiguities by adding information on hadronic parameters [2,3]. In particular, as noted in refs. [4][5][6], the hadronic parameters entering the B d → π + π − and the B s → K + K − decays are connected by U-spin, so that the experimental knowledge of B s → K + K − can definitely improve the extraction of the CKM phase with the GL analysis. Indeed, in ref.[3], the measurement of BR(B s → K + K − ) was used to obtain an upper bound on one of the hadronic parameters.After the pioneering studies performed at the TeVatron, very recently LHCb opened up the road to CP violation in B s → KK decays [7]. The present experimental information is summarized in Table I. At present, one has all the necessary information to use the U-spin strategy proposed by Fleischer (F) in refs. [4,5] to extract the CKM phase from a combined analysis of B d → π + π − and the B s → K + K − decays. However, as we will show explicitly below, this strategy alone suffers from a sizable dependence on the breaking of U-spin symmetry [8].Furthermore, in the B s system the measurement of any time-dependent CP asymmetry cannot be directly translated into a measurement of the angle β s = arg − V * tb Vts V * cb Vcs , even in the case of the so-called "gold-plated" b → ccs decays. This is due to the fact that the angle β s is small and correlated to the subdominant amplitude in b → ccs decays. Thus, measuring β s requires the determination of the subdominant decay amplitude. This is evident by noting that using CKM unitarity the b → s decay amplitude can be written asNaively dropping the doubly Cabibbo-suppressed term proportional to V ub V * us would lead to the conclusion that the CP asymmetry measures 2β s with the first choice or that the CP asymmetry should vanish in the second choice. Clearly, a full treatment of the decay amplitude, taking into account correlations between the various CKM terms, is necessary to give a meaningful interpretation to the CP asymmetry. This is at variance with the B d case, whe...

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“…[19], and is approached in Ref. [18]. It is also present, albeit on a low key and in a very different looking form, in the original paper [17] itself 4 .…”

Section: The Grossman-quinn Bound Revisitedmentioning

confidence: 96%

“…while the locations of the two other mirror solutions are fixed by Eqs. ( 17) and (18). In particular, if C ππ is small, omitting the last parenthesis which is close to unity, the drift from α eff of α( 1) is very small:…”

Section: The Grossman-quinn Bound Revisitedmentioning

confidence: 98%

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Isospin constraints from/on $B \to \pi\pi$

Pivk

Diberder

2005

Eur. Phys. J. C

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The Standard Model constraints on α which can be derived from the B → ππ decays are revisited in some depth. As experimental inputs, the B 0 → π + π − , B + → π + π 0 decays complemented by the B 0 → π 0 π 0 decays, the CP parameters S ππ and C ππ , and/or the value of α as determined by the global CKM fit are used. The constraints discussed here are model independent in the sense that they rely only on Isospin symmetry, following the Gronau-London proposal. A new bound on B 00 and the function C 00 (B 00 ) are introduced. While another bound applied to BABAR results is shown to imply that cos(2α eff ) is negative. The Grossman-Quinn bound is rediscussed. A close form expression is given for α as a function of the measurements. Various scenarii for the future of the isospin analysis are explored. To probe the Standard Model the (B 00 , C 00 ) plane is introduced.

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Taming the penguin contributions in theBd0(t)→π+<

Cited by 81 publications

References 52 publications

Implications of LHCb measurements and future prospects

Implications of LHCb measurements and future prospects

Testing the standard model and searching for new physics with B d → ππ and B s → KK decays

Isospin constraints from/on $B \to \pi\pi$

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