scholarly journals Tau polarimetry in B meson decays

2019 ◽  
Author(s):  
Rodrigo Alonso ◽  
Jorge Martin Camalich ◽  
Susanne Westhoff
Keyword(s):  
B Meson ◽  
New Physics ◽  
B Meson Decays ◽  
Meson Decays ◽  
Tau Decays ◽  
Decay Products ◽  
Recent Developments ◽  
Belle Ii ◽  
Polarization Observables ◽  
Hadronic Tau

This article summarizes recent developments in B\to D^{(\ast)}\tau\nuB→D(*)τν decays. We explain how to extract the tau lepton’s production properties from the kinematics of its decay products. The focus is on hadronic tau decays, which are most sensitive to the tau polarizations. We present new results for effects of new physics in tau polarization observables and quantify the observation prospects at BELLE II.

scholarly journals MIRROR MATTER ADMIXTURES IN KS→γγ

2006 ◽  
Vol 21 (19n20) ◽  
pp. 4197-4207 ◽  
Author(s):  
G. SÁNCHEZ-COLÓN ◽  
A. GARCÍA
Keyword(s):  
Experimental Data ◽  
Theoretical Prediction ◽  
Mirror Symmetry ◽  
B Meson ◽  
Branching Ratio ◽  
New Physics ◽  
B Meson Decays ◽  
Mixing Angles ◽  
Meson Decays ◽  
Mirror Matter

The latest measurement of the KS→γγ branching ratio clearly shows an enhancement over the current theoretical prediction. As in other K and B meson decays, this invites to consider the possibility of the contribution of new physics. We study a particular form of the latter, which may be refered to as manifest mirror symmetry. The experimental data are described using previously determined values for the mixing angles of the admixtures of mirror matter in ordinary hadrons and by assuming that for π0, η, η′ → γγ, the mirror decay amplitudes have the same magnitudes as their ordinary counterparts.

scholarly journals RADIATIVE AND ELECTROWEAK RARE B DECAYS

2004 ◽  
Vol 19 (06) ◽  
pp. 934-948 ◽  
Author(s):  
M. NAKAO
Keyword(s):  
B Meson ◽  
Dominant Role ◽  
Rare Decay ◽  
Neutral Current ◽  
New Physics ◽  
Beyond The Standard Model ◽  
B Meson Decays ◽  
Meson Decays ◽  
Flavor Changing ◽  
Flavor Changing Neutral Current

This report summarizes the latest experimental results on radiative and electroweak rare B meson decays. These rare decay processes proceed through the Flavor-Changing-Neutral-Current processes, and thus are sensitive to the postulated new particles in the theories beyond the Standard Model. Experiments at e+e- colliders, Belle, BaBar and CLEO, have been playing the dominant role, while the CDF and D0 experiments have just started to provide new results from Tevatron Run-II. The most significant achievement is the first observation of the decay B→K*ℓ+ℓ-, which opens a new window to search for new physics in B meson decays.

scholarly journals QCD AND HEAVY HADRON DECAYS

2004 ◽  
Vol 19 (07) ◽  
pp. 1017-1029 ◽  
Author(s):  
G. BUCHALLA
Keyword(s):  
B Meson ◽  
Theoretical Framework ◽  
Current Interest ◽  
B Meson Decays ◽  
Meson Decays ◽  
Weak Decays ◽  
Heavy Hadron ◽  
Recent Developments

We review recent developments in QCD pertaining to its application to weak decays of heavy hadrons. We concentrate on exclusive rare and nonleptonic B-meson decays, discussing both the theoretical framework and phenomenological issues of current interest.

scholarly journals Searching new physics in rare B-meson decays into multiple muons

2019 ◽  
Vol 79 (5) ◽  
Author(s):  
Mikael Chala ◽  
Ulrik Egede ◽  
Michael Spannowsky
Keyword(s):  
B Meson ◽  
New Physics ◽  
B Meson Decays ◽  
Meson Decays

scholarly journals Angular and polarization observables for Majorana-mediated B decays with effective interactions

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Lucía Duarte ◽  
Gabriel Zapata ◽  
Oscar A. Sampayo
Keyword(s):  
B Meson ◽  
Effective Field ◽  
B Decays ◽  
B Meson Decays ◽  
Effective Interactions ◽  
Meson Decays ◽  
Vector Interaction ◽  
Lepton Colliders ◽  
The Standard Model ◽  
Polarization Observables

AbstractWe probe the effective field theory extending the Standard Model with a sterile neutrino in B meson decays at B factories and lepton colliders, using angular and polarization observables. We put bounds on different effective operators characterized by their distinct Dirac–Lorentz structure, and probe the N-mediated B decays sensitivity to these interactions. We define a forward–backward asymmetry $$A_\mathrm{FB}^{\ell \gamma }$$ A FB ℓ γ between the muon and photon directions for the $$B \rightarrow \mu \nu \gamma $$ B → μ ν γ decay, which allows us to separate the SM contribution from the effective lepton number conserving and violating processes, mediated by a near on-shell N. Using the most stringent constraints on the effective parameter space from Belle and BaBar we find that a measurement of the final polarization $$P_{\tau }$$ P τ in the rare $$B^-\rightarrow \ell ^-_{1}\ell ^-_{2} \pi ^+$$ B - → ℓ 1 - ℓ 2 - π + decays can help us infer the scalar or vector interaction content in the N production or decay vertices. We find that the B meson decays are more sensitive to scalar operators.

scholarly journals Semileptonic B-Meson decays at Belle II

2018 ◽  
Author(s):  
Jo-Frederik Krohn ◽  
Keyword(s):  
B Meson ◽  
B Meson Decays ◽  
Meson Decays ◽  
Belle Ii

scholarly journals New physics effects from B meson decays

Pramana ◽  
2000 ◽  
Vol 55 (1-2) ◽  
pp. 265-270 ◽  
Author(s):  
Anirban Kundu
Keyword(s):  
B Meson ◽  
New Physics ◽  
B Meson Decays ◽  
Meson Decays
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