scholarly journals Rare decay π0 → e + e − as a test of standard model

2010 ◽  
Vol 7 (4) ◽  
pp. 229-234 ◽  
Author(s):  
A. E. Dorokhov
Keyword(s):  
Standard Model ◽  
Rare Decay ◽  
Test Of Standard Model

scholarly journals SPECTATOR EFFECTS IN THE DECAY B→Kγγ

2005 ◽  
Vol 20 (17) ◽  
pp. 4079-4084 ◽  
Author(s):  
A. YU. IGNATIEV ◽  
G. C. JOSHI ◽  
B. H. J. MCKELLAR
Keyword(s):  
Standard Model ◽  
Decay Mode ◽  
Short Distance ◽  
Enhancement Factor ◽  
Rare Decay ◽  
Branching Ratio ◽  
The Spectator

We report the results of the first computation related to the study of the spectator effects in the rare decay mode B→Kγγ within the framework of Standard Model. It is found that the account of these effects results in the enhancement factor for the short-distance reducible contribution to the branching ratio.

scholarly journals Probing new physics with $B^0_s\to\mu^+\mu^-$: Status and perspectives

2014 ◽  
Vol 29 (21) ◽  
pp. 1444004 ◽  
Author(s):  
Robert Fleischer
Keyword(s):  
Standard Model ◽  
Decay Width ◽  
Rare Decay ◽  
Branching Ratio ◽  
New Physics ◽  
High Luminosity ◽  
Width Difference ◽  
Rate Asymmetry ◽  
The Standard Model ◽  
Meson System

The rare decay [Formula: see text] plays a key role for the testing of the Standard Model. It is pointed out that the sizable decay width difference ΔΓsof the Bs-meson system affects this channel in a subtle way. As a consequence, its calculated Standard Model branching ratio has to be upscaled by about 10%. Moreover, the sizable ΔΓsmakes a new observable through the effective [Formula: see text] lifetime accessible, which probes New Physics in a way complementary to the branching ratio and adds an exciting new topic to the agenda for the high-luminosity upgrade of the LHC. Further probes of New Physics are offered by a CP-violating rate asymmetry. Correlations between these observables and the [Formula: see text] branching ratio are illustrated for specific models of New Physics.

scholarly journals EFFECT OF BOTH Z AND Z′-MEDIATED FLAVOR-CHANGING NEUTRAL CURRENTS ON Bs →τ+τ- DECAY

2012 ◽  
Vol 27 (31) ◽  
pp. 1250184 ◽  
Author(s):  
S. SAHOO ◽  
D. BANERJEE ◽  
M. KUMAR ◽  
S. MOHANTY
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Rare Decay ◽  
Charge Asymmetry ◽  
Branching Ratio ◽  
New Physics ◽  
Neutral Currents ◽  
Flavor Changing ◽  
Potential Source ◽  
Flavor Changing Neutral Currents

In recent years, Bs →τ+τ- rare decay has attracted a lot of attention since it is very sensitive to the structure of standard model (SM) and potential source of new physics beyond SM. In this paper, we study the effect of both Z and Z′-mediated flavor-changing neutral currents on the Bs →τ+τ- decay. We find the branching ratio B(Bs→τ+τ-) is enhanced relative to SM prediction, which would help to explain the recently observed CP-violation from like-sign dimuon charge asymmetry in the B system.

scholarly journals Rare decay beyond standard model

2001 ◽  
Vol 506 (1-2) ◽  
pp. 77-84 ◽  
Author(s):  
T.M. Aliev ◽  
A. Özpineci ◽  
M. Savcı
Keyword(s):  
Beyond Standard Model ◽  
Standard Model ◽  
Rare Decay

Rare decay in the standard model

1988 ◽  
Vol 214 (3) ◽  
pp. 459-462 ◽  
Author(s):  
C.A. Dominguez ◽  
N. Paver ◽  
Riazuddin
Keyword(s):  
Standard Model ◽  
Rare Decay ◽  
The Standard Model

scholarly journals EXTENDING THE STANDARD MODEL: AN UPPER BOUND FOR A NEUTRINO MASS FROM THE RARE DECAY $K^+\rightarrow\pi^+\nu\bar\nu$

2000 ◽  
Vol 15 (08) ◽  
pp. 579-586 ◽  
Author(s):  
B. MACHET
Keyword(s):  
Standard Model ◽  
Neutrino Mass ◽  
Upper Bound ◽  
Average Rate ◽  
Rare Decay ◽  
Yukawa Couplings ◽  
Flavor Changing ◽  
Upper Limit ◽  
Quartic Term ◽  
The Standard Model

The standard model seeming at a loss to account for the present experimental average rate for the rare decay [Formula: see text], we tackle the question with the extension of the Glashow–Salam–Weinberg model to an SU (2)L× U (1) gauge theory of J = 0 mesons proposed in Ref. 7, in which, in addition, the neutrinos are given Dirac masses from Yukawa couplings to the Higgs boson. The latter triggers a new contribution to this decay through flavor changing neutral currents that arise in the quartic term of the symmetry breaking potential; it becomes sizable for a neutrino mass in the MeV range; the experimental upper limit for the decay rate translates into an upper bound of 5.5 MeV for the mass of the neutrino, three times lower than the present direct bounds.

scholarly journals τ mass andR-value measurements at BES

2017 ◽  
Vol 32 (10) ◽  
pp. 1730004 ◽  
Author(s):  
Zhipeng Zheng ◽  
Shuangshi Fang ◽  
Guangshun Huang
Keyword(s):  
Standard Model ◽  
Present Status ◽  
Energy Region ◽  
Extensive Discussion ◽  
Comprehensive Review ◽  
Recent Developments ◽  
Test Of Standard Model

A comprehensive review of the measurements of [Formula: see text] lepton mass and R-values in the energy region between 2–5 GeV, achieved at the BES experiment, is presented. In addition to the evaluation of their impact on the test of Standard Model, we also highlighted the present status and the most recent developments. In particular, we made an extensive discussion on the prospects for future improvements at the BESIII experiment.

scholarly journals Angular analysis of the rare decay $$ {B}_s^0 $$ → ϕμ+μ−

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
◽  
R. Aaij ◽  
A. S. W. Abdelmotteleb ◽  
C. Abellán Beteta ◽  
T. Ackernley ◽  
...  
Keyword(s):  
Standard Model ◽  
Invariant Mass ◽  
Rare Decay ◽  
Angular Distributions ◽  
Proton Collision ◽  
Centre Of Mass ◽  
Proton Proton ◽  
Angular Analysis ◽  
Model Predictions ◽  
Proton Proton Collision

Abstract An angular analysis of the rare decay $$ {B}_s^0 $$ B s 0 → ϕμ+μ− is presented, using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 8.4 fb−1. The observables describing the angular distributions of the decay $$ {B}_s^0 $$ B s 0 → ϕμ+μ− are determined in regions of q2, the square of the dimuon invariant mass. The results are consistent with Standard Model predictions.

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