Electroweak corrections to the charm quark contribution to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mi>ν</mml:mi><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>

Brod, Joachim; Gorbahn, Martin

doi:10.1103/physrevd.78.034006

Cited by 126 publications

(93 citation statements)

References 42 publications

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“…It is known to NLO in QCD and electroweak interactions [36,38,42,44]. The parameter P c describes the short-distance contribution of the charm quark and has been calculated including NNLO QCD [45][46][47] and NLO electroweak corrections [48]. Other long-distance contributions are contained in the parameter δP c,u [43].…”

Section: Jhep02(2015)141mentioning

confidence: 99%

Probing anomalous t t ¯ Z $$ t\overline{t}Z $$ interactions with rare meson decays

Brod

Greljo

Stamou

et al. 2015

J. High Energ. Phys.

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Anomalous couplings of the Z boson to top quarks are only marginally constrained by direct searches and are still sensitive to new particle dynamics at the TeV scale. Employing an effective field theory approach we consider the dimension-six operators which generate deviations from the standard-model vector and axial-vector interactions. We show that rare B and K meson decays together with electroweak precision observables provide strong constraints on these couplings. We also consider constraints from t-channel singletop production.

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Section: Jhep02(2015)141mentioning

confidence: 99%

Probing anomalous t t ¯ Z $$ t\overline{t}Z $$ interactions with rare meson decays

Brod

Greljo

Stamou

et al. 2015

J. High Energ. Phys.

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“…Furthermore, in this case we choose the up-type quarks to be the SM mass eigenstate fields, so the factors of the CKM matrix move to the terms with the down-type quarks. Then D mixing implies for all models except Model XI, 39) where now η (X) mix = 1. Note that for Models V-VIII the constraint from D mixing is slightly stronger than from the real part of K mixing.…”

Section: Jhep10(2015)027mentioning

confidence: 99%

“…For K + → π + ν iνi [36][37][38][39][40] where λ K (q 2 ) is a phase space factor, f + and f T are q 2 -dependent form factors. The B → πµ + µ − rate is obtained with obvious replacements.…”

Section: Jhep10(2015)027mentioning

confidence: 99%

New vector-like fermions and flavor physics

Ishiwata

Ligeti

Wise

2015

J. High Energ. Phys.

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Abstract:We study renormalizable extensions of the standard model that contain vectorlike fermions in a (single) complex representation of the standard model gauge group. There are 11 models where the vector-like fermions Yukawa couple to the standard model fermions via the Higgs field. These models do not introduce additional fine-tunings. They can lead to, and are constrained by, a number of different flavor-changing processes involving leptons and quarks, as well as direct searches. An interesting feature of the models with strongly interacting vector-like fermions is that constraints from neutral meson mixings (apart from CP violation in K 0 −K 0 mixing) are not sensitive to higher scales than other flavor-changing neutral-current processes. We identify order 1/(4πM ) 2 (where M is the vector-like fermion mass) one-loop contributions to the coefficients of the four-quark operators for meson mixing, that are not suppressed by standard model quark masses and/or mixing angles.

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“…The branching ratio of this decay is predicted with high accuracy in the Standard Model: a recent calculation yields (8.5 ± 0.7) × 10 −11 , where the uncertainty is dominated by the CKM elements, as reported in [2] and references therein.…”

Section: Introductionmentioning

confidence: 99%

The NA62 Gigatracker: detector properties and pixel read-out architectures

Fiorini¹,

Ceccucci²,

Gil³

et al. 2010

Proceedings of 2009 KAON International Conference — PoS(KAON09)

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The beam spectrometer of the NA62 experiment has to sustain high and non-uniform beam rate (∼1.5 MHz/mm 2 in the hot center and 0.8-1.0 GHz in total, hence the name Gigatracker) and should preserve beam divergence and limit beam hadronic interactions. The Gigatracker has to provide precise momentum, time and angular measurements on every single track of the secondary 75 GeV/c hadron beam with a timing precision of 150 ps (rms). To meet these requirements, three hybrid silicon pixel detector stations will be installed in vacuum. An adequate strategy to compensate the discriminator time-walk must be implemented and R&D investigating two different options is ongoing. Two prototypes have been designed in order to have an experimental comparison of the performances: one approach is based on the use of a constant-fraction discriminator followed by an on-pixel TDC, while the other one is based on the use of a Timeover-Threshold circuit followed by a TDC shared by a group of pixels.

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Electroweak corrections to the charm quark contribution toK+→π+νν¯

Cited by 126 publications

References 42 publications

Probing anomalous t t ¯ Z $$ t\overline{t}Z $$ interactions with rare meson decays

Probing anomalous t t ¯ Z $$ t\overline{t}Z $$ interactions with rare meson decays

New vector-like fermions and flavor physics

The NA62 Gigatracker: detector properties and pixel read-out architectures

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