Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userA new limit of T-violating transverse muon polarization in the $K^{+}topi^{0}mu^{+} u$ decay
341
0
0.0
(
0
)
Ask ChatGPT about the research
No Arabic abstract
A search for T-violating transverse muon polarization ($P_T$) in the $K^{+}to pi^{0}mu^{+} u$ decay was performed using kaon decays at rest. A new improved value, $P_T= -0.0017pm 0.0023 (stat)pm 0.0011 (syst)$, was obtained giving an upper limit, $| P_T | < 0.0050$. The T-violation parameter was determined to be Im$xi = -0.0053 pm 0.0071(stat)pm 0.0036(syst)$ giving an upper limit, $|$Im$xi| <0.016$.
rate research
Read More
A search for T-violating muon polarization in the $K^+ to pi^0 mu^+ u$ decay has been performed at KEK using stopped kaons. A new improved limit was obtained, $P_T= -0.0017 pm 0.0023 (stat) pm 0.0011 (syst)$, corresponding to a 90 % confidence limit of $| P_T| < 0.0050$. The T-violating parameter was also determined to be Im$xi = -0.0053 pm 0.0071 (stat) pm 0.0036 (syst)$, and $|{rm Im}xi| < 0.016$ (90 % CL).
We present a new result based on an analysis of the data collected by the MEG detector at the Paul Scherrer Institut in 2009 and 2010, in search of the lepton flavour violating decay mu->e gamma. The likelihood analysis of the combined data sample, which corresponds to a total of 1.8 x 10**14 muon decays, gives a 90% C.L. upper limit of 2.4 x 10**-12 on the branching ratio of the mu->e gamma decay, constituting the most stringent limit on the existence of this decay to date.
Using data collected by the fixed target Fermilab experiment FOCUS, we present several first measurements for the semileptonic decay $D^0 to bar{K}^0pi^-mu^+ u$. Using a model that includes a $bar{K}^0 pi^-$ S-wave component, we measure the form factor ratios to be r_v= 1.706+-0.677+-0.342 and r_2= 0.912+-0.370+-0.104 and the S-wave amplitude to be A=0.347+-0.222+-0.053 GeV^-1. Finally, we measure the vector semileptonic branching ratio $frac{Gamma(D^0 to K^{*}(892){-}mu^+ u)}{Gamma(D^0 to bar{K}^0pi^-pi^+)}= 0.337+-0.034+-0.013.
We have searched for the lepton-flavor-violating decay $B^{0}to K^{ast 0} mu^{pm} e^{mp}$ using a data sample of 711 $fb^{-1}$ that contains $772 times 10^{6}$ $Bbar{B}$ pairs. The data were collected near the $Upsilon (4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. No signals were observed, and we set 90% confidence level upper limits on the branching fractions of ${cal B}(B^{0}to K^{ast 0} mu^{+} e^{-})< 1.2times 10^{-7}$, ${cal B}(B^{0}to K^{ast 0} mu^{-} e^{+})< 1.6times 10^{-7}$, and, for both decays combined, ${cal B}(B^{0}to K^{ast 0} mu^{pm} e^{mp}) < 1.8times 10^{-7}$. These are the most stringent limits on these decays to date.
The K^+ to pi^0 mu^+ u gamma ($K_{mu 3 gamma}$) decay has been measured with stopped positive kaons at the KEK 12 GeV proton synchrotron. A $K_{mu 3 gamma}$ sample containing 125 events was obtained. The partial branching ratio $Br(K_{mu 3 gamma}, E_{gamma}>30 {rm MeV}, theta_{mu^+ gamma}>20^{circ})$ was found to be $[2.4 pm 0.5(stat) pm 0.6(syst)]times 10^{-5}$, which is in good agreement with theoretical predictions.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
