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 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→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

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

scholarly journals Measurement of the branching ratio and an upper limit on

1995 ◽  
Vol 343 (1-4) ◽  
pp. 444-452 ◽  
Author(s):  
D. Buskulic ◽  
D. Casper ◽  
I. De Bonis ◽  
D. Decamp ◽  
P. Ghez ◽  
...  
Keyword(s):  
Branching Ratio ◽  
Upper Limit

Search for an exotic three-body decay of orthopositronium o-Ps   γ + X1 + X2

2002 ◽  
Vol 80 (11) ◽  
pp. 1281-1285 ◽  
Author(s):  
P Crivelli
Keyword(s):  
Decay Rate ◽  
Decay Mode ◽  
Confidence Level ◽  
Branching Ratio ◽  
Mass Range ◽  
Interacting Particles ◽  
Upper Limit ◽  
Model Independent ◽  
Predicted Values ◽  
Three Body

We carried out a model independent search for an exotic three-body decay of orthopositronium o-Ps [Formula: see text] γ + X1 + X2 into a photon and two weak interacting particles X1 and X2. The existence of this decay could explain the discrepancy between the measured and the predicted values of the orthopositronium-decay rate in vacuum. Our result excludes this decay mode as the origin of the discrepancy and an upper limit on the branching ratio has been set B(o-Ps [Formula: see text] γ + X1 + X2) < 4.4 x 10–5 (at the 90% confidence level), for the photon energy in the range from 40 < Eγ < 400 keV and for the weak interacting particles X mass range 0 [Formula: see text] mX1 + mX2 [Formula: see text] 900 keV. PACS No.: 36.10Dr

E865 RESULT: AN IMPROVED UPPER LIMIT ON THE DECAY K+ → π+μ+e-

2005 ◽  
Vol 20 (15) ◽  
pp. 3349-3351 ◽  
Author(s):  
◽  
ALEKSEY SHER
Keyword(s):  
Previous Experiment ◽  
National Laboratory ◽  
Branching Ratio ◽  
Brookhaven National Laboratory ◽  
Upper Limit ◽  
Lepton Family

Based on results of a search for the lepton-family-number-violating decay K+ → π+μ+e- with data collected by experiment E865 in 1998 at the Alternating Gradient Synchrotron of Brookhaven National Laboratory we report an upper limit on the branching ratio at 2.2 × 10-11 (90% C.L.). In combination with results based on the data collected in 1995, 1996, and a previous experiment, E777, an upper limit on the branching ratio of 1.2 × 10-11 (90% C.L.) is obtained.

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