scholarly journals New upper limit for the branching ratio of theΩ−→Ξ−γ radiative decay

1994 ◽  
Vol 50 (1) ◽  
pp. R18-R20 ◽  
Author(s):  
I. F. Albuquerque@f ◽  
N. F. Bondar@f ◽  
R. Carrigan ◽  
D. Chen ◽  
P. S. Cooper@f ◽  
...  
Keyword(s):  
Radiative Decay ◽  
Branching Ratio ◽  
Upper Limit

scholarly journals Search for π0 decays to invisible particles

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
E. Cortina Gil ◽  
◽  
A. Kleimenova ◽  
E. Minucci ◽  
S. Padolski ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Confidence Level ◽  
Branching Ratio ◽  
Standard Model Higgs Boson ◽  
Scalar Mixing ◽  
Upper Limit ◽  
Upper Limits ◽  
The Standard Model ◽  
Model Independent

Abstract The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ → π+π0(γ), searching for the decay of the π0 to invisible particles. No signal is observed in excess of the expected background fluctuations. An upper limit of 4.4 × 10−9 is set on the branching ratio at 90% confidence level, improving on previous results by a factor of 60. This result can also be interpreted as a model- independent upper limit on the branching ratio for the decay K+ → π+X, where X is a particle escaping detection with mass in the range 0.110–0.155 GeV/c2 and rest lifetime greater than 100 ps. Model-dependent upper limits are obtained assuming X to be an axion-like particle with dominant fermion couplings or a dark scalar mixing with the Standard Model Higgs boson.

scholarly journals Upper limit on the branching ratio for the decay τ-→Π-ηvτ

1987 ◽  
Vol 197 (4) ◽  
pp. 561-564 ◽  
Author(s):  
K.K. Gan ◽  
G.S. Abrams ◽  
D. Amidei ◽  
A.R. Baden ◽  
T. Barklow ◽  
...  
Keyword(s):  
Branching Ratio ◽  
Upper Limit

scholarly journals An upper limit on the branching ratio for τ decays into seven charged particles

1997 ◽  
Vol 404 (1-2) ◽  
pp. 213-222 ◽  
Author(s):  
K. Ackerstaff ◽  
G. Alexander ◽  
J. Allison ◽  
N. Altekamp ◽  
K.J. Anderson ◽  
...  
Keyword(s):  
Charged Particles ◽  
Branching Ratio ◽  
Upper Limit

A GLANCE BEYOND THE STANDARD MODEL: LATEST RESULTS FROM THE MEG EXPERIMENT

2014 ◽  
Vol 35 ◽  
pp. 1460390
Author(s):  
SIMEONE DUSSONI
Keyword(s):  
Beyond Standard Model ◽  
Standard Model ◽  
High Intensity ◽  
State Of The Art ◽  
Branching Ratio ◽  
Beyond The Standard Model ◽  
Upper Limit ◽  
The Standard Model ◽  
Key Features ◽  
Very High

The MEG experiment started taking data in 2009 looking for the Standard Model suppressed decay μ → e + γ, which, if observed, can reveal Beyond Standard Model physics. It makes use of state-of-the art detectors optimized for operating in conditions of very high intensity, rejecting as much background as possible. The data taking ended August 2013 and an upgrade R&D is started to push the experimental sensitivity. The present upper limit on the decay Branching Ratio (BR) is presented, obtained with the subset of data from 2009 to 2011 run, together with a description of the key features of the upgraded detector.

scholarly journals Upper limit on the η→γγγ branching ratio with the KLOE detector

2004 ◽  
Vol 591 (1-2) ◽  
pp. 49-54 ◽  
Author(s):  
A Aloisio ◽  
F Ambrosino ◽  
A Antonelli ◽  
M Antonelli ◽  
C Bacci ◽  
...  
Keyword(s):  
Branching Ratio ◽  
Upper Limit

scholarly journals Upper limit on the η→π+π− branching ratio with the KLOE detector

2005 ◽  
Vol 606 (3-4) ◽  
pp. 276-280 ◽  
Author(s):  
F. Ambrosino ◽  
A. Antonelli ◽  
M. Antonelli ◽  
C. Bacci ◽  
M. Barva ◽  
...  
Keyword(s):  
Branching Ratio ◽  
Upper Limit

scholarly journals RADIATIVE DECAY ZH→γAH IN THE LITTLE HIGGS MODEL WITH T-PARITY

2011 ◽  
Vol 26 (32) ◽  
pp. 5349-5368 ◽  
Author(s):  
I. CORTÉS-MALDONADO ◽  
G. TAVARES-VELASCO
Keyword(s):  
Radiative Decay ◽  
Branching Ratio ◽  
Small Region ◽  
Higgs Model ◽  
Tree Level ◽  
Little Higgs ◽  
Precision Data ◽  
The One ◽  
Three Body ◽  
Electroweak Precision

In the little Higgs model with T-parity (LHTM), the only tree-level kinematically allowed two-body decay of the ZH boson can be the ZH→AHH decay and thus one-loop induced two-body decays may have a significant rate. We study the ZH→γAH decay, which is induced at the one-loop level by a fermion triangle and is interesting as it depends on the mechanism of anomaly cancelation of the model. All the relevant two- and three-body decays of the ZH gauge boson arising at the tree-level are also calculated. We considered a small region of the parameter space where f is still allowed to be as low as 500 GeV by electroweak precision data. We analyzed the scenario of a Higgs with a mass of 120 GeV. We found that the ZH→γAH branching ratio can be of the order of a tree-level three-body decay and may be at the reach of detection at the LHC for f close to 500 GeV, but it may be difficult to detect for f = 1 TeV . There is also an scenario where the Higgs boson has an intermediate mass such that the ZH→AHH decay is closed, the ZH→γAH gets considerably enhanced and the chances of detection get a large boost.

A new upper limit for the branching ratio of the decay K0S → e+e−

1986 ◽  
Vol 167 (1) ◽  
pp. 138-140 ◽  
Author(s):  
G.S. Bitsadze ◽  
Yu.A. Budagov ◽  
I.E. Chirikov-Zorin ◽  
V.P. Dzhelepov ◽  
A.A. Feshchenko ◽  
...  
Keyword(s):  
Branching Ratio ◽  
Upper Limit

RADIATIVE TRANSITION $\Lambda _c^ + \to \sum ^ + _\gamma $

1993 ◽  
Vol 08 (05) ◽  
pp. 399-408 ◽  
Author(s):  
L. MAHARANA ◽  
A. NATH
Keyword(s):  
Quark Model ◽  
Significant Role ◽  
Radiative Decay ◽  
Branching Ratio ◽  
Radiative Transition

The radiative decay of [Formula: see text] is considered in a field theoretic quark model. It is found that the size of the baryon plays significant role and the branching ratio of the decay is highly suppressed by the order of factor 10−8.

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