Search for b → dγ decays

2005 ◽  
Vol 20 (16) ◽  
pp. 3627-3630
Author(s):  
◽  
Debabrata Mohapatra
Keyword(s):  
Confidence Level ◽  
B Meson ◽  
Branching Fraction ◽  
Neutral Current ◽  
Search Results ◽  
Current Process ◽  
Flavor Changing ◽  
Upper Limit ◽  
Flavor Changing Neutral Current

We report search results for flavor-changing neutral current process b → dγ with a data sample containing 275 million B meson pairs accumulated at ϒ(4S) resonance. We studied the exclusive decays B+ → ρ+γ, B0 → ρ0γ and B0 → ωγ, and find no significant signal. We set an upper limit for combined branching fraction [Formula: see text] at 90% confidence level.

SEARCH FOR THE DECAY Bs→μ+μ -ϕ IN $p\bar p$ COLLISIONS AT $\sqrt{s} =1.8\, {\rm TeV}$

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 461-463
Author(s):  
◽  
THOMAS SPEER
Keyword(s):  
Confidence Level ◽  
Branching Fraction ◽  
Neutral Current ◽  
Current Decay ◽  
Flavor Changing ◽  
Upper Limit ◽  
Flavor Changing Neutral Current ◽  
Neutral Current Decay

We present a search for the flavor-changing neutral current decay Bs→ μ+μ-ϕ in [Formula: see text] collisions at [Formula: see text], using 91.4 pb-1 of data collected at the Collider Detector at Fermilab (CDF). We find two candicate events for this decay, which is consistent with the background estimate, and set a preliminary upper limit on the branching fraction of ℬ(Bs → μ+ μ-ϕ)<4.2 · 10-5 at a 90% confidence level.

Improved upper limit on flavor-changing neutral-current decays of thebquark

1987 ◽  
Vol 35 (11) ◽  
pp. 3533-3536 ◽  
Author(s):  
A. Bean ◽  
G. J. Bobbink ◽  
I. C. Brock ◽  
A. Engler ◽  
T. Ferguson ◽  
...  
Keyword(s):  
Neutral Current ◽  
Flavor Changing ◽  
Upper Limit ◽  
Flavor Changing Neutral Current

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 Study of electroweak penguin B decays at Belle II experiment

2021 ◽  
Vol 2145 (1) ◽  
pp. 012018
Author(s):  
J Ineead ◽  
S Nishida ◽  
B Asavapibhop ◽  
N Suwonjandee
Keyword(s):  
Branching Fraction ◽  
Neutral Current ◽  
New Physics ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Penguin Diagram ◽  
The Status ◽  
Flavor Changing Neutral Current ◽  
Belle Ii ◽  
Exclusive Decay

Abstract The electroweak b → sll (l = e, µ) transition is a flavor-changing neutral current process that mediates through a one-loop penguin diagram. The decay is considered to be a good probe for the New Physics as particles predicted in the beyond Standard Model theories can enter into the loop. The exclusive decay B → K (*) l + l − was first observed by the Belle experiment and it provides many observables such as the branching fraction, CP asymmetry, forward-backward asymmetry, and other angular observables. Recently, the LHCb experiment has reported some clue of a lepton flavor universality violation from the branching fraction ratio of the B → Kµ + µ − and B → Ke + e − decays. In this presentation, we report the status of the B → Kl + l − decay analysis at the Belle II experiment which started the data taking in 2019. We also, present an activity at the Belle II Chulalongkorn University group where we study the B → KJ/ψ decay which has the same topology as the B → Kl + l − .

A SEARCH FOR B→τν

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 636-638 ◽  
Author(s):  
◽  
JOHN GREGG THAYER
Keyword(s):  
Confidence Level ◽  
B Meson ◽  
Branching Fraction ◽  
Slight Modification ◽  
B Meson Decays ◽  
Meson Decays ◽  
Decay Modes ◽  
Upper Limit ◽  
Charged B Meson

We report results of a search for B→τν in a sample of 9.7 million charged B meson decays. The search uses both πν and [Formula: see text] decay modes of the τ, and demands exclusive reconstruction of the companion [Formula: see text] decay to suppress background. We set an upper limit on the branching fraction ℬ(B→τν)<8.4×10-4 at 90% confidence level. With slight modification to the analysis we also establish [Formula: see text] at 90% confidence level.

Impact of Z′ boson on lepton flavor violating decays

2019 ◽  
Vol 34 (12) ◽  
pp. 1950068
Author(s):  
P. Maji ◽  
P. Nayek ◽  
S. Sahoo
Keyword(s):  
B Meson ◽  
Neutral Current ◽  
Branching Ratio ◽  
Test Theory ◽  
Decay Channels ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Flavor Changing Neutral Current ◽  
Text Model ◽  
Three Body

Recently, some small hints of lepton flavor violating (LFV) decays have been probed in different colliders and accelerators. Although these processes are forbidden in the Standard Model (SM), observation of LFV decays are considered as good probes to test theory beyond the SM. In this paper, we study some LFV decays, e.g. three-body decay channels of [Formula: see text] lepton like [Formula: see text], [Formula: see text] and two-body decays of B meson and [Formula: see text] lepton like [Formula: see text] and [Formula: see text] in [Formula: see text] model. We calculate the branching ratio of the above decays considering the effect of both [Formula: see text] and [Formula: see text]-mediated flavor-changing neutral-current (FCNC).

Upper Limit on Flavor-Changing Neutral-Current Decays of thebQuark

1984 ◽  
Vol 53 (14) ◽  
pp. 1309-1313 ◽  
Author(s):  
P. Avery ◽  
C. Bebek ◽  
K. Berkelman ◽  
D. G. Cassel ◽  
J. W. DeWire ◽  
...  
Keyword(s):  
Neutral Current ◽  
Flavor Changing ◽  
Upper Limit ◽  
Flavor Changing Neutral Current

scholarly journals Status of rare exclusive B meson decays in 2018

2018 ◽  
Vol 33 (18n19) ◽  
pp. 1830016 ◽  
Author(s):  
Johannes Albrecht ◽  
Stefanie Reichert ◽  
Danny van Dyk
Keyword(s):  
B Meson ◽  
Experimental Situation ◽  
Neutral Current ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Theoretical Status ◽  
Flavor Changing Neutral Current ◽  
B Quark

This review discusses the present experimental and theoretical status of rare flavor-changing neutral current b-quark decays at the beginning of 2018. It includes a discussion of the experimental situation and details of the currently observed anomalies in measurements of flavor observables, including lepton flavor universality. Progress on the theory side within and beyond the Standard Model theory is also discussed, together with potential New Physics interpretations of the present measurements.

scholarly journals Search for rare and forbidden decays of D0 → ℓ+ℓ-

2005 ◽  
Vol 20 (16) ◽  
pp. 3677-3679
Author(s):  
◽  
Chunhui Chen
Keyword(s):  
Confidence Level ◽  
Neutral Current ◽  
Branching Fractions ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Upper Limits ◽  
Flavor Changing Neutral Current ◽  
Babar Detector

We report on a search for the flavor-changing neutral current decays D0 → e+e- and D0 → μ+μ-, and the lepton-flavor violating decay D0 → e±μ∓. The measurement is based on 122 fb-1 of data collected by the BABAR detector at the PEP-II asymmetric e+e- collider. No evidence is found for any of the decays. The upper limits on the branching fractions, at the 90% confidence level, are 1.2 × 10-6 for D0 → e+e-, 1.3 × 10-6 for D0 → μ+μ-, and 8.1 × 10-7 for D0 → e±μ∓.

scholarly journals Search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c.

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
◽  
M. Ablikim ◽  
M. N. Achasov ◽  
P. Adlarson ◽  
S. Ahmed ◽  
...  
Keyword(s):  
Confidence Level ◽  
Branching Fraction ◽  
Center Of Mass ◽  
Leptonic Decay ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Upper Limit ◽  
Electron Positron

Abstract Using 10.1 × 109J/ψ events produced by the Beijing Electron Positron Collider (BEPCII) at a center-of-mass energy $$ \sqrt{s} $$ s = 3.097 GeV and collected with the BESIII detector, we present a search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c. No excess of signal above background is observed, and an upper limit on the branching fraction ℬ(J/ψ → D−e+νe + c. c.) < 7.1 × 10−8 is obtained at 90% confidence level. This is an improvement of more than two orders of magnitude over the previous best limit.

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