21 research outputs found
Search for Lepton-Flavor-Violating tau Decays into a Lepton and an f0(980) Meson
We search for lepton-flavor-violating tau decays into a lepton (electron or
muon) and an f0(980) meson using 671 fb-1 of data collected with the Belle
detector at the KEKB asymmetric-energy e+e- collider. No events are observed
and we set the following 90% C.L. upper limits on the branching fraction
products: B(tau- -> e-f0(980))*B(f0(980)->pi+pi-)
mu-f0(980))*B(f0(980) -> pi+pi-)<3.4x10^-8. This is the first search performed
for these modes.Comment: 10 pages, 4 figures, submitted to Phys. Lett.
Search for Lepton-Flavor-Violating and Lepton-Number-Violating tau to lhh' Decay Modes
We search for lepton-flavor-violating and lepton-number-violating tau decays
into a lepton (l = electron or muon) and two charged mesons (h, h' = pion or
Kaon) using 854 fb^{-1} of data collected with the Belle detector at the KEKB
asymmetric-energy e^+e^- collider. We obtain 90% confidence level upper limits
on the tau to lhh' branching fractions in the range (2.0-8.4)*10^{-8}. These
results improve upon our previously published upper limits by factors of about
1.8 on average.Comment: 14 pages, 5 figures, submitted to Phys. Lett.
Search for Lepton Flavor Violating tau- Decays Including with a K0s Meson
We have searched for the lepton flavor violating decays \tau^-\to \ell^-\ks
(), using a data sample of 281 fb collected with the
Belle detector at the KEKB asymmetric-energy collider. No evidence for
a signal was found in either of the decay modes, and we set the following upper
limits for the branching fractions: {\cal{B}}(\tau^-\to e^-\ks) < 5.6\times
10^{-8} and {\cal{B}}(\tau^-\to \mu^-\ks) < 4.9\times 10^{-8} at the 90%
confidence level. These results improve the previously published limits set by
the CLEO collaboration by factors of 16 and 19, respectively.Comment: 9 pages, 3figures, submitted to Phys.Lett.
Search for Lepton Flavor Violating tau Decays into Three Leptons
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.Comment: 11 pages, 4 figures, submitted to Phys. Lett.
Search for Lepton-Flavor-Violating tau Decays into a Lepton and a Vector Meson
We search for lepton-flavor-violating tau-> ell V^0 decays, where ell is an
electron or muon and V^0 is one of the vector mesons rho^0, phi, omega, K*0 and
K*0-bar. We use 854 fb^{-1} of data collected with the Belle detector at the
KEKB asymmetric-energy e^+e^- collider. No evidence for a signal is found in
any decay mode, and we obtain 90% confidence level upper limits on the
individual branching fractions in the range (1.2-8.4)*10^{-8}.Comment: 13 pages, 5 figures, submitted to Phys. Lett.
Hypoxic Pulmonary Vasoconstriction in Humans:Tale or Myth
Hypoxic Pulmonary vasoconstriction (HPV) describes the physiological adaptive process of lungs to preserves systemic oxygenation. It has clinical implications in the development of pulmonary hypertension which impacts on outcomes of patients undergoing cardiothoracic surgery. This review examines both acute and chronic hypoxic vasoconstriction focusing on the distinct clinical implications and highlights the role of calcium and mitochondria in acute versus the role of reactive oxygen species and Rho GTPases in chronic HPV. Furthermore it identifies gaps of knowledge and need for further research in humans to clearly define this phenomenon and the underlying mechanism