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Precise measurement of the K+- --> pi+-e+e- decay

A sample of 7253 $K^\pm\to\pi^\pm e^+e^-(\gamma)$ decay candidates with 1.0% background contamination has been collected by the NA48/2 experiment at the CERN SPS, allowing a precise measurement of the decay properties. The branching ratio…

High Energy Physics - Experiment · Physics 2014-11-18 2 collaboration

The supersymmetric prediction for the muon transverse polarization in the $K^+ \leftarrow \pi^0 \mu^+ \nu_\mu$ decay

The muon transverse polarization in the $K^+ \leftarrow \pi^0 \mu^+ \nu_\mu$ decay will be measured at the $10^{-4}$ level in forthcoming experiments. We compare the phenomenological perspectives with the theoretical predictions in…

High Energy Physics - Phenomenology · Physics 2014-11-17 Marco Fabbrichesi , Francesco Vissani

A Search for $B\to \tau\nu$

We report results of a search for $B\to\tau\nu$ in a sample of 9.7 million charged $B$ meson decays. The search uses both $\pi\nu$ and $\ell\nu\bar\nu$ decay modes of the $\tau$, and demands exclusive reconstruction of the companion $\bar…

High Energy Physics - Experiment · Physics 2010-04-08 T. E. Browder , CLEO Collaboration

K->pipie+e- decays and chiral low-energy constants

The branching ratios of the measured decay $K_L\to\pi^+\pi^-e^+e^-$ and of the still unmeasured decay $K^+\to\pi^+\pi^0e^+e^-$ are calculated to next-to-leading order in Chiral Perturbation Theory (CHPT). Recent experimental results are…

High Energy Physics - Phenomenology · Physics 2009-01-07 Hannes Pichl

Measurement of Ds+ to mu+ nu and the Decay constant f_Ds

We examine e+e- to Ds- Ds*+ or Ds-* Ds+ collisions at 4170 MeV using the CLEO-c detector in order to measure the decay constant f_Ds+. We use the Ds+ to ell+ nu channel, where the ell+ designates either a mu+ or a tau+. Analyzing both modes…

High Energy Physics - Experiment · Physics 2007-05-23 M. Artuso , CLEO Collaboration

Observation of the rare decay K_S -> pi^0mu^+mu^-

A search for the decay K_S -> pi^0mu^+mu^- has been made by the NA48/1 Collaboration at the CERN SPS accelerator. The data were collected during 2002 with a high-intensity K_S beam. Six events were found with a background expectation of…

High Energy Physics - Experiment · Physics 2008-11-26 J. R. Batley

On the short-distance constraints from K_{L,S} -> mu^+ mu^-

Motivated by new precise results on several $K_L$ decays, sensitive to the ${K_L \to \gamma \gamma}$ form factor, we present a new analysis of the $K_L\to \mu^+\mu^-$ long-distance amplitude based on a semi-phenomenological approach.…

High Energy Physics - Phenomenology · Physics 2009-11-10 Gino Isidori , Rene Unterdorfer

Measurement of Structure Dependent K^+ -> mu^+ nu gamma

We report the first measurement of a structure dependent component in the decay K^+ -> mu^+ nu gamma. Using the kinematic region where the muon kinetic energy is greater than 137 MeV and the photon energy is greater than 90 MeV, we find…

High Energy Physics - Experiment · Physics 2012-08-27 E787 Collaboration

Search for B0 Decays to Invisible Final States and to nu nubar gamma

We establish upper limits on branching fractions for B0 decays to final states where the decay products are purely invisible (i.e., no observable final state particles) and for B0 decays to nu nubar gamma. Within the Standard Model, these…

High Energy Physics - Experiment · Physics 2008-11-26 B. Aubert , BABAR Collaboration

Constraints on the new particle in $\Sigma^+\to p\mu^+\mu^-$

The HyperCP collaboration has presented the branching ratio of $\Sigma^+\to p\mu^+\mu^-$ to be $(8.6^{+6.6}_{-5.4}\pm 5.5)\times 10^{-8}$ and suggested a new boson $P^0$ with a mass of $214.3\pm 0.5$ MeV to induce the flavor changing…

High Energy Physics - Phenomenology · Physics 2009-11-11 C. Q. Geng , Y. K. Hsiao

Observation of B+ --> K1(1270)+ gamma

We report the observation of the radiative decay B+ --> K1(1270)+ gamma using a data sample of 140 fb-1 taken at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- collider. We find the branching fraction to be Br(B+ -->…

High Energy Physics - Experiment · Physics 2019-08-14 Heyoung Yang

Measurement of the Forward-Backward Asymmetry in the B -> K(*) mu+ mu- Decay and First Observation of the Bs -> phi mu+ mu- Decay

We reconstruct the rare decays $B^+ \to K^+\mu^+\mu^-$, $B^0 \to K^{*}(892)^0\mu^+\mu^-$, and $B^0_s \to \phi(1020)\mu^+\mu^-$ in a data sample corresponding to $4.4 {\rm fb^{-1}}$ collected in $p\bar{p}$ collisions at $\sqrt{s}=1.96 {\rm…

High Energy Physics - Experiment · Physics 2015-03-17 CDF Collaboration , T. Aaltonen

Angular analysis and branching fraction measurement of the decay B0 to K*0 mu+ mu-

The angular distributions and the differential branching fraction of the decay B0 to K*(892)0 mu+ mu- are studied using a data sample corresponding to an integrated luminosity of 5.2 inverse femtobarns collected with the CMS detector at the…

High Energy Physics - Experiment · Physics 2013-11-11 CMS Collaboration

Rare Radiative B -> tau^+ tau^- gamma Decay

The radiative B -> tau^+ tau^- gamma decay is investigated in the framework of the Standard Model. When only short (short and long together) distance contributions are taken into account, the Branching Ratio is found as 9.54x10^(-9)…

High Energy Physics - Phenomenology · Physics 2009-10-30 T. M. Aliev , N. K. Pak , M. Savci

On the branching ratio of the "second class" tau --> eta' pi nu_tau decay

We present an assessment of the standard model expectations for the branching ratio of the isotopic spin and G-parity violating decay tau --> eta' pi nu_tau. The estimate is based on a vector and scalar meson dominance parametrization of…

High Energy Physics - Phenomenology · Physics 2011-08-09 N. Paver , Riazuddin