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Cho, Peter L.; Misiak, Mikołaj

doi:10.1103/physrevd.49.5894

Cited by 141 publications

(159 citation statements)

References 32 publications

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“…A brief inspection into the structure of Q LL and Q RR (most conveniently in the unitary gauge) reveals that all the relevant Feynman diagrams are identical to those that have already occurred either in the SM or in the LR-model [10] analyses of b ! s .…”

Section: Matchingmentioning

confidence: 99%

Erratum: AnomalousWtbcoupling effects in the weak radiativeB-meson decay [Phys. Rev. D78, 077501 (2008)]

Grza̧dkowski¹,

Misiak²

2011

Phys. Rev. D

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105

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We study the effect of anomalous Wtb couplings on the " B ! X s branching ratio. The considered couplings are introduced as parts of gauge-invariant dimension-six operators that are built out of the standard model fields only. One-loop contributions from the charged-current vertices are assumed to be of the same order as the tree-level flavor-changing neutral current ones. Bounds on the corresponding Wilson coefficients are derived.

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Section: Matchingmentioning

confidence: 99%

Erratum: AnomalousWtbcoupling effects in the weak radiativeB-meson decay [Phys. Rev. D78, 077501 (2008)]

Grza̧dkowski¹,

Misiak²

2011

Phys. Rev. D

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105

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“…The most general expressions for the mass matrices in the Left-Right Model are given in Eqs. (7) and (8), where κ is real, κ ′ is complex and F and G are Hermitian. The magnitudes of κ and κ ′ are fixed within our model (see Eqs.…”

Section: Below)mentioning

confidence: 99%

“…Left-right symmetry may be restored to the weak interactions at the Lagrangian level by introducing a new right-handed gauge boson. The aesthetic appeal of the so-called Left-Right Model has led many to study it over the past few decades and the formal properties of the model are well-known [1,2,3,4,5,6,7,8,9,10,11]. One feature that has emerged is that the new right-handed gauge boson must have a mass in the TeV range in order to evade the stringent bounds imposed by ∆m K [12].…”

Section: Introductionmentioning

confidence: 99%

UbiquitousCPviolation in a top-inspired left-right model

et al. 2002

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We explore CP violation in a Left-Right Model that reproduces the quark mass and CKM rotation angle hierarchies in a relatively natural way by fixing the bidoublet Higgs VEVs to be in the ratio m b : m t . Our model is quite general and allows for CP to be broken by both the Higgs VEVs and the Yukawa couplings. Despite this generality, CP violation may be parameterized in terms of two basic phases. A very interesting feature of the model is that the mixing angles in the right-handed sector are found to be equal to their left-handed counterparts to a very good approximation. Furthermore, the right-handed analogue of the usual CKM phase δ L is found to satisfy the relation δ R ≈ δ L . The parameter space of the model is explored by using an adaptive Monte Carlo algorithm and the allowed regions in parameter space are determined by enforcing experimental constraints from the K and B systems. This method of solution allows us to evaluate the left-and right-handed CKM matrices numerically for various combinations of the two fundamental CP-odd phases in the model. We find that all experimental constraints may be satisfied with right-handed W and Flavour Changing Neutral Higgs masses as low as about 2

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“…One possibility is a small V + A admixture to the standard lefthanded t → b current as is predicted for instance by SU(2) L × SU(2) R × U(1) extensions of the standard model. The measured branching ratio of the radiative weak decay b → sγ provides a stringent constraint [4,5,6,7] on the coupling strength κ R of such a right-handed admixture: |κ R | 0.04. Of course, one may envisage contrived scenarios where other contributions to b → sγ lead to cancellations that invalidate this bound -in any case, a direct search for such a coupling in t andt decays is indispensable.…”

mentioning

confidence: 99%

“…1. The order α s contributions to the polarisation independent part of the lepton distributions (3), (4). …”

mentioning

confidence: 99%

Semileptonic decays of polarised top quarks: V+A admixture and QCD corrections

2004

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Abstract:The semileptonic decays of polarised top quarks are analysed for a general chiralityconserving tbW vertex. We calculate double differential distributions for the charged lepton and the neutrino to order α s in the QCD coupling. We present these QCD corrections in terms of compact parameterisations that should be useful for the future investigation of the structure of the top decay vertex on the basis of large data samples. PACS number(s): 12.60.Cn, 13.88.+e, 14.65.Ha Keywords: top quark decay, spin polarisation, anomalous couplings, QCD corrections 1 E-mail address: breuther@physik.rwth-aachen.de 2 supported by D.F.G. SFB/TR9 3 supported by BMBF contract 05 HT1PAA/4So far the experimental information about the decays of top quarks is not very detailed. Data from the Tevatron are consistent with the expectation that these decays are governed by the V − A charged current interactions of the standard model (SM); but because of the size of the present experimental errors sizable new physics effects can not be excluded (c.f. for instance [1]).In view of the extremely large mass of the top quarks and the circumstance that they do not hadronise these particles are excellent probes of new interactions that may uncover at energies of a few hundred GeV. There is a vast literature on the phenomenology of such interactions in top quark decays (for overviews, see for instance [2,3]). One possibility is a small V + A admixture to the standard lefthanded t → b current as is predicted for instance by SU(2) L × SU(2) R × U(1) extensions of the standard model. The measured branching ratio of the radiative weak decay b → sγ provides a stringent constraint [4,5,6,7] on the coupling strength κ R of such a right-handed admixture: |κ R | 0.04. Of course, one may envisage contrived scenarios where other contributions to b → sγ lead to cancellations that invalidate this bound -in any case, a direct search for such a coupling in t andt decays is indispensable. Sensitive tests require polarised top quarks. At the LHC the single top production processes will yield large samples of polarised t andt quarks, and it has been estimated [8,9] that a statistical sensitivity δκ R ≃ 0.06 can be reached. From tt pair production at a high-luminosity linear e + e − collider a sensitivity δκ R ≃ 0.03 will be feasible [10,11,3].Energy and angular distributions for polarised top quark decays with a V + A admixture in the tbW vertex were investigated in a number of articles, including [12,13,14,15]. In ref.[13] semileptonic t decays were analysed and it was pointed out that the polarisation-dependent part of the neutrino distribution (which can be determined experimentally by measuring the missing momentum) is very sensitive to κ R . The order α s QCD corrections for the V − A part of the charged current [16,17] were incorporated in [13]. In view of the above-mentioned expected sensitivity to κ R at future colliders one should note that taking into account QCD corrections in future data analysis is mandatory, because they can mimic a small V +A a...

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b→sγdecay inSU(2)L×

Cited by 141 publications

References 32 publications

Erratum: AnomalousWtbcoupling effects in the weak radiativeB-meson decay [Phys. Rev. D78, 077501 (2008)]

Erratum: AnomalousWtbcoupling effects in the weak radiativeB-meson decay [Phys. Rev. D78, 077501 (2008)]

UbiquitousCPviolation in a top-inspired left-right model

Semileptonic decays of polarised top quarks: V+A admixture and QCD corrections

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