35,847 research outputs found

### Direct test of time reversal invariance violation in B mesons

In this letter we reinterpret and reanalyze the available data of the B meson
factories showing the existence of direct experimental evidence of time
reversal invariance violation in B mesons. This reinterpretation consists of
using the available observables to define a new observable which, in a model
independent way and without assuming CPT invariance, compares a transition
between a $B^0$ and a here-defined $B_\alpha$-state, with its time reversed
transition. The observable then offers a direct way to probe time reversal
invariance and it is therefore independent of any conclusion obtained from
current experimental information on CP violation and CPT invariance. As far as
the authors are concerned, this is the first direct evidence of time reversal
invariance violation in B mesons and also the first one obtained from decaying
particles whose mean life time difference is negligible.Comment: 9 pages, no figures. Refined version matching published article in
Modern Physics Letters

### Standard Model Higgs and Top Mass Measurements at the Tevatron

A summary of the present Standard Model Higgs search and measurement of top
quark mass at the Tevatron are presented. The sensitivity of the present Higgs
search at the Tevatron is limited by statistics to a cross section
approximately two orders of magnitude higher than the predicted cross section
for Standard Model Higgs production. With 30/fb of integrated luminosity, the
Tevatron offers an unique potential discovery window for the Standard Model
Higgs mass up to 130 GeV before LHC era. The study of top at the Tevatron has
moved from discovery phase to one of characterizing its properties. The
combined result of top quark mass is 174.3+- 5.1 GeV.Comment: 7 pages, latex source-file, 5 figures as ps-file. Talk given at The
Division of Particles and Fields Conference 1999, January 5-9, 1999, UCLA,
US

### Quark and lepton mass matrices with $A_4$ family symmetry

Realistic quark masses and mixing angles are obtained applying the successful
$A_4$ family symmetry for leptons, motivated by the quark-lepton assignments of
SU(5). The $A_4$ symmetry is suitable to give tri-bimaximal neutrino mixing
matrix which is consistent with current experimental data. We study new
scenario for the quark sector with the $A_4$ symmetry.Comment: 16 pages, 2 figures, Talk given at International Workshop on Neutrino
Masses and Mixings, Shizuoka, Japan, 17-19 December 200

### Search for Rare b-hadron Decays at CDF

We report on searches for B^0_s to \mu^+ \mu^-, B^0_d to \mu^+ \mu^- decays
and b to s \mu^+\mu^- transitions in exclusive decays of B mesons.
Using 2 fb^{-1} of data collected by the CDF II detector we find upper limits
on the branching fractions B(B^0_s to \mu^+ \mu^-) < 5.8 x 10^{-8} and B(B^0_d
to \mu^+ \mu^-) < 1.8 x 10^{-8} at 95% confidence level.
Using 924 pb^{-1} of data we measure the branching fractions B(B^+ to \mu^+
\mu^- K^+) = (0.60 \pm 0.15 \pm 0.04) x 10^{-6}, B(B^0_d to \mu^+ \mu^- K^{*0})
= (0.82 \pm 0.31 \pm 0.10) x 10^{-6} and the limit B(B^0_s to \mu^+ \mu^-
phi)/B(B^0_s to J/\psi\phi) < 2.61(2.30) x 10^{-3} at 95(90)% confidence level.Comment: 3 pages, 5 figures, conference proceedings to the 2007 Europhysics
Conference on High Energy Physics (Manchester, July 2007

### Charm mixing in the Standard Model and beyond

The motivation most often cited in searches for D0-anti-D0 mixing and
CP-violation in charm system lies with the possibility of observing a signal
from New Physics which dominates that from the Standard Model. We review recent
theoretical predictions and experimental constraints on D0-anti-D0 mixing
parameters, concentrating on possible effects of New Physics.Comment: 8 pages, 2 figures, Invited talk at International Workshop on
Tau-Charm Physics (Charm 2006), Beijing, China, 5-7 Jun 200

### Dynamics of strong and radiative decays of Ds-mesons in the hadrogenesis conjecture

The positive parity scalar D$_{s0}^*$(2317) and axial-vector D$_{s1}^*$(2460)
charmed strange mesons are generated by coupled-channel dynamics through the
s-wave scattering of Goldstone bosons off the pseudoscalar and vector
D(D$_s$)-meson ground states. The specific masses of these states are obtained
as a consequence of the attraction arising from the Weinberg-Tomozawa
interaction in the chiral Lagrangian. Chiral corrections to order Q$_\chi^2$
are calculated and found to be small. The D$_{s0}^*$(2317) and D$_{s1}^*$(2460)
mesons decay either strongly into the isospin-violating $\pi^0$D$_s$ and
$\pi^0$D$_s^*$ channels or electromagnetically. We show that the $\pi^0$-$\eta$
and (K$^0$D$^+$-K$^+$D$^0$) mixings act constructively to generate strong
widths of the order of 140 keV and emphasize the sensitivity of this value to
the $KD$ component of the states. The one-loop contribution to the radiative
decay amplitudes of scalar and axial-vector states is calculated using the
electromagnetic Lagrangian to chiral order Q$_\chi^2$. We show the importance
of taking into account processes involving light vector mesons explicitly in
the dynamics of electromagnetic decays. The radiative width are sensitive to
both $\eta D_s$ and $KD$ components, hence providing information complementary
to the strong widths on the positive parity $D_s$-meson structure.Comment: 4 pages, Invited Contribution to QNP09, Beijing, September 21-26,
200

### Lepton flavor violating $l_i\to l_j \gamma\gamma$ decays induced by scalar unparticle

We study the radiative lepton flavor violating l_i -> l_j \gamma\gamma decays
in the case that the lepton flavor violation is induced by the scalar
unparticle mediation. We restrict the scaling dimension d_u and the scalar
unparticle-photon-photon coupling by using the experimental upper limit of the
branching ratio of the decay \mu -> e \gamma\gamma. Furthermore, we predict the
BRs of the other radiative decays by using the restrictions we get. We observe
that the measurements of upper limits of BRs of these decays ensure
considerable information for testing the possible signals coming from
unparticle physicsComment: 10 pages, 5 figures, 1 tabl

### Dynamics of strong and radiative decays of Ds mesons

The positive parity scalar D$_{s0}^*$(2317) and axial-vector D$_{s1}^*$(2460)
charmed strange mesons are generated by coupled-channel dynamics through the
s-wave scattering of Goldstone bosons off the pseudoscalar and vector
D(D$_s$)-meson ground states. The attraction leading to the specific masses of
these states reflects the chiral symmetry breaking scale which characterizes
the Weinberg-Tomozawa interaction in the chiral Lagrangian. Chiral corrections
to order Q$_\chi^2$ are calculated and found to be small. The D$_{s0}^*$(2317)
and D$_{s1}^*$(2460) mesons decay either strongly into the isospin-violating
$\pi^0$D$_s$ and $\pi^0$D$_s^*$ channels or electromagnetically. We show that
the $\pi^0$-$\eta$ and (K$^0$D$^+$-K$^+$D$^0$) mixings act constructively to
generate strong widths of the order of 140 keV. The one-loop contribution to
the radiative decay amplitudes of scalar and axial-vector states is calculated
using the electromagnetic Lagrangian to chiral order Q$_\chi^2$. We show the
importance of taking into account processes involving light vector mesons
explicitly in the dynamics of electromagnetic decays to obtain a satisfactory
description of the available data.Comment: Contribution to the Meson 2008 Conference, June 6-10, Cracow, Polan

### Cross-Correlation-Function-Based Multipath Mitigation Method for Sine-BOC Signals

Global Navigation Satellite Systems (GNSS) positioning accuracy indoor and urban canyons environments are greatly affected by multipath due to distortions in its autocorrelation function. In this paper, a cross-correlation function between the received sine phased Binary Offset Carrier (sine-BOC) modulation signal and the local signal is studied firstly, and a new multipath mitigation method based on cross-correlation function for sine-BOC signal is proposed. This method is implemented to create a cross-correlation function by designing the modulated symbols of the local signal. The theoretical analysis and simulation results indicate that the proposed method exhibits better multipath mitigation performance compared with the traditional Double Delta Correlator (DDC) techniques, especially the medium/long delay multipath signals, and it is also convenient and flexible to implement by using only one correlator, which is the case of low-cost mass-market receivers

### The XYZs of Charmonium at BES

This contribution reviews some recent developments in charmonium
spectroscopy, and discusses related theoretical predictions. The spectrum of
states, strong decays of states above open charm threshold, electromagnetic
transitions, and issues related to the recent discoveries of the "XYZ" states
are discussed. Contributions that BES can make to our understanding of
charmonium and related states are stressed in particular.Comment: 5 pages, 1 eps figure. Invited contribution to the International
Workshop on Tau-Charm Physics Charm2006 (5-7 June 2006, Beijing, China

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