Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userSearch for neutrinoless decays tau -> 3l
135
0
0.0
(
0
)
Ask ChatGPT about the research
No Arabic abstract
We have searched for neutrinoless tau lepton decays into three charged leptons using an 87.1 fb^{-1} data sample collected with the Belle detector at the KEKB e^+e^- collider. Since the number of signal candidate events is compatible with that expected from the background, we set 90% confidence level upper limits on the branching fractions in the range (1.9-3.5) x 10^{-7} for various decay modes tau -> l l l where l represents e or mu.
rate research
Read More
Neutrinoless tau-lepton decays into either three leptons (tau- -> l1- l2 l3) or one lepton and one K0S meson(tau- -> l- K0S) where lepton l means either an electron or muon, have been searched for using 48.6 fb^{-1} of data collected with the Belle detector at the KEKB e+e- collider. No evidence for candidate decays are found in any channel. Therefore we set 90% confidence level upper limits on the branching fraction for 8 different decay modes. These limits are more stringent than those set previously and reach to the 10^{-7} level.
We have searched for neutrinoless tau lepton decays into l h h or l V0, where l stands for an electron or muon, h for a charged light hadron, pi or K, and V0 for a neutral vector meson, rho, K*(892) and phi, using a 158 /fb data sample collected with the Belle detector at the KEKB e+e- collider. Since the number of events observed are consistent with the expected background, we set upper limits on the branching fractions in the range of 1.6-8.0 x 10-7 for various decay modes at the 90% confidence level.
A search for the rare decays $B_s^0totau^+tau^-$ and $B^0totau^+tau^-$ is performed using proton--proton collision data collected with the LHCb detector. The data sample corresponds to an integrated luminosity of 3fb$^{-1}$ collected in 2011 and 2012. The $tau$ leptons are reconstructed through the decay $tau^-topi^-pi^+pi^- u_{tau}$. Assuming no contribution from $B^0totau^+tau^-$ decays, an upper limit is set on the branching fraction $mathcal{B}(B_s^0totau^+tau^-) < 6.8times 10^{-3}$ at 95% confidence level. If instead no contribution from $B_s^0totau^+tau^-$ decays is assumed, the limit is $mathcal{B}(B^0totau^+tau^-)< 2.1 times 10^{-3}$ at 95% confidence level. These results correspond to the first direct limit on $mathcal{B}(B_s^0totau^+tau^-)$ and the worlds best limit on $mathcal{B}(B^0totau^+tau^-)$.
We report on a search for the lepton flavor violating tau- -> mu- gamma and tau- -> e- gamma decays based on 535/fb of data accumulated at the Belle experiment. No signal is found and we set 90% confidence level upper limits on the branching ratios Br(tau- -> mu- gamma) < 4.5x10^-8 and Br(tau- -> e- gamma) < 1.2x10^-7.
We search for lepton-flavor-violating tau decays into three leptons (electron or muon) using 535 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. No evidence for these decays is observed, and we set 90% confidence level upper limits on the branching fractions of (2.0-4.1)x10^-8. These results improve upon our previously published upper limits by factors of 4.9 to 10.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
