New Physics constraints by rare decays at the B factories

2010 ◽  
Vol 209 (1) ◽  
pp. 149-154
Author(s):  
C. Schwanda
Keyword(s):  
Rare Decays ◽  
New Physics

scholarly journals RARE DECAYS AND CP VIOLATION BEYOND THE STANDARD MODEL

2006 ◽  
Vol 21 (08n09) ◽  
pp. 1738-1749 ◽  
Author(s):  
LUCA SILVESTRINI
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Rare Decays ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Unitarity Triangle ◽  
Minimal Flavour Violation ◽  
The Standard Model ◽  
The Status ◽  
Flavour Violation

We review the status of rare decays and CP violation in extensions of the Standard Model. We analyze the determination of the unitarity triangle and the model-independent constraints on new physics that can be derived from this analysis. We find stringent bounds on new contributions to [Formula: see text] and [Formula: see text] mixing, pointing either to models of minimal flavour violation or to models with new sources of flavour and CP violation in b → s transitions. We discuss the status of the universal unitarity triangle in minimal flavour violation, and study rare decays in this class of models. We then turn to supersymmetric models with nontrivial mixing between second and third generation squarks, discuss the present constraints on this mixing and analyze the possible effects on CP violation in b → s nonleptonic decays and on [Formula: see text] mixing. We conclude presenting an outlook on Lepton-Photon 2009.

New physics through interference of nonstandard interactions with Standard Model in rare decays of Bc+ meson

2018 ◽  
Vol 33 (30) ◽  
pp. 1850171
Author(s):  
Shakeel Mahmood ◽  
Farida Tahir ◽  
Azeem Mir
Keyword(s):  
Experimental Data ◽  
Standard Model ◽  
Rare Decays ◽  
New Physics ◽  
Final State ◽  
Neutrino Interactions ◽  
Bc Meson ◽  
Free Parameters

We investigate the nonstandard neutrino interactions (NSI) in the rare decays of [Formula: see text] mesons involving neutrinos in the final state. It is suggested that the interference between Standard Model and nonstandard interaction can provide sizeable contribution. We calculate the limits on NSI free parameters ([Formula: see text], [Formula: see text]) and compare them with experimental data.

B-Meson Decay

2017 ◽  
Vol 3 (3) ◽  
Author(s):  
Joaquim Matias
Keyword(s):  
Large Hadron Collider ◽  
Rare Decays ◽  
B Mesons ◽  
B Meson ◽  
Hadron Collider ◽  
New Physics ◽  
Meson Decay ◽  
B Meson Decay ◽  
Particle Physicist

Particle physicist Joaquim Matias analyzes recent results from the Large Hadron Collider—in particular, rare decays of B-mesons that suggest the violation of leptonic universality—for evidence of New Physics.

scholarly journals Hints of new physics from $D_{s}^{+}\rightarrow K^{+}\upsilon\bar{\upsilon}$, $D^{0}\rightarrow\pi^{0}\upsilon\bar{\upsilon}$ and $D_{s}^{+}\rightarrow D^{+}\upsilon\bar{\upsilon}$ decays

2015 ◽  
Vol 30 (01) ◽  
pp. 1550004 ◽  
Author(s):  
Shakeel Mahmood ◽  
Farida Tahir ◽  
Azeem Mir
Keyword(s):  
Rare Decays ◽  
Strong Dependence ◽  
Branching Ratios ◽  
New Physics

We study rare decays [Formula: see text], [Formula: see text] and [Formula: see text] in NSIs. We calculate the NSIs branching ratios of these decays. There is a strong dependence of these on new physics parameter. They provide stringent constraints on [Formula: see text], [Formula: see text] and [Formula: see text] (α, β = e, μ).

scholarly journals B → K(∗)μ+μ− in covariant quark model

2015 ◽  
Vol 39 ◽  
pp. 1560113
Author(s):  
A. Liptaj ◽  
S. Dubnička ◽  
A. Z. Dubničková ◽  
M. A. Ivanov
Keyword(s):  
Beyond Standard Model ◽  
Standard Model ◽  
Quark Model ◽  
Rare Decays ◽  
Form Factors ◽  
New Physics ◽  
Angular Distributions ◽  
Heavy Mesons ◽  
Theoretical Predictions ◽  
Covariant Quark Model

The covariant quark model with infrared confinement (CQM) is a well-suited theoretical framework to describe large variety of hadronic processes, including rare decays of heavy mesons. In this text we focus on the reactions [Formula: see text], which have been recently measured by Refs. 1–4. The measurements include also information about the angular distributions and their significance is given by possible New Physics (NP) effects which are predicted in numerous beyond Standard Model (SM) scenarios. Even with clever choice of experimental observables, a model dependence cannot be fully removed from the theoretical predictions. In this text we present the computation of the [Formula: see text] form factors within the CQM and give results for some of the most commonly used observables ([Formula: see text], [Formula: see text]).

RARE B AND τ DECAYS AND SEARCHES FOR NEW PHYSICS

2007 ◽  
Vol 22 (30) ◽  
pp. 5433-5442
Author(s):  
R. J. BARLOW
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Excellent Agreement ◽  
Rare Decays ◽  
B Mesons ◽  
New Physics ◽  
B Decays ◽  
The Standard Model ◽  
Model Predictions ◽  
Vector Particles

New results on rare decays of B mesons and τ leptons are summarised. Measurement are generally in excellent agreement with the Standard Model predictions, the only exceptions being the polarisation of vector particles in B decays and the non-appearance of CP violation in B ± → K ±π0.

scholarly journals Looking for new physics via semi-leptonic and leptonic rare decays of D and D s

2017 ◽  
Vol 41 (9) ◽  
pp. 093107 ◽  
Author(s):  
Xing-Dao Guo ◽  
Xi-Qing Hao ◽  
Hong-Wei Ke ◽  
Ming-Gang Zhao ◽  
Xue-Qian Li
Keyword(s):  
Rare Decays ◽  
New Physics

Hints of NSIs from $D_{s}^{+}\rightarrow K^{+}\upsilon\bar{\upsilon}$, $D^{0}\rightarrow\pi^{0}\upsilon\bar{\upsilon}$ and $D_{s}^{+}\rightarrow D^{+}\upsilon\bar{\upsilon}$

2015 ◽  
Vol 30 (02) ◽  
pp. 1550013 ◽  
Author(s):  
Shakeel Mahmood ◽  
Farida Tahir ◽  
Azeem Mir
Keyword(s):  
Rare Decays ◽  
Strong Dependence ◽  
Branching Ratios ◽  
New Physics ◽  
Third Generation

We study rare decays [Formula: see text], [Formula: see text] and [Formula: see text] in NSIs. We calculate the NSIs branching ratios of these decays. There is a strong dependence of these on new physics parameter. We include second and third generation of quarks in the loop for these decays. We show that these provide stringent constraints on [Formula: see text], where Q = u, c, t, and [Formula: see text], where q = d, s, b. It is also pointed out that [Formula: see text] for α, β = e, μ.

scholarly journals BRIEF REVIEW OF THE SEARCHES FOR THE RARE DECAYS $B^0_{s}\to\mu^+\mu^-$ and $B^0\to\mu^+\mu^-$

2012 ◽  
Vol 27 (27) ◽  
pp. 1230028 ◽  
Author(s):  
JOHANNES ALBRECHT
Keyword(s):  
Standard Model ◽  
Rare Decays ◽  
Branching Fractions ◽  
New Physics ◽  
Exclusion Limit ◽  
Experimental Status ◽  
Highly Sensitive ◽  
The Standard Model

The current experimental status of the searches for the very rare decays [Formula: see text] and [Formula: see text] is discussed. These channels are highly sensitive to various extensions of the Standard Model, especially in the scalar and pseudoscalar sector. The recent, most sensitive measurements from the CDF, ATLAS, CMS and LHCb collaborations are discussed and the combined upper exclusion limit on the branching fractions determined by the LHC experiments is shown to be 4.2×10-9 for [Formula: see text] and 0.8×10-9 for [Formula: see text]. The implications of these tight bounds on a selected set of New Physics models is sketched.

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