32 research outputs found
D0D0bar Quantum Correlations, Mixing, and Strong Phases
Due to the presence of the quantum correlation between the pair-produced D0
and D0bar from the decay of the psi(3770), the time-integrated single and
double tag decay rates depend on charm mixing amplitudes,
doubly-Cabibbo-suppressed amplitudes, and the relative strong phase, delta,
between D0 and D0bar decays to identical final states. Using 281 pb^-1 of
integrated luminosity collected with the CLEO-c detector on the psi(3770)
resonance, we measure the absolute branching fractions of D0 decays to K-pi+,
CP eigenstates, and semileptonic final states to determine cos(delta) for K-pi+
and to limit the mixing amplitude y.Comment: 3 pages, to appear in the Proceedings of PANIC'05 (Particles and
Nuclei International Conference), Santa Fe, NM, October 24-28 200
Measurement of Orbitally Excited D-Mesons at CDF II
Measurement of Orbitally Excited D-Mesons at CDF II Igor V. Gorelov (For the
CDF Collaboration)
Talk given on behalf of the CDF Collaboration at the First Meeting of the APS
Topical Group on Hadronic Physics, GHP 2004, 24-26 October 2004, FERMILAB.
Results on the first measurement of orbitally excited neutral D-meson states,
D*_2 and D_1, produced in hadron collisions at Tevatron are presented. Using
data from the displaced track trigger, CDF II collects the largest world sample
of these states in decay modes D*+ pi-, D+ pi-. Masses and widths of both
states have been measured with precision better than or comparable to the world
average.Comment: 6 pages, 5 figures, talk given on behalf of the CDF Collaboration at
the First Meeting of the APS Topical Group on Hadronic Physics, GHP 2004, Oct
24-26,2004, Fermilab, Batavia, Illinoi
Flavor SU(3) analysis of charmless B meson decays to two pseudoscalar mesons
Global fits to charmless B --> PP decays in the framework of flavor SU(3)
symmetry are updated and improved without reference to the \sin2\beta measured
from the charmonium decay modes. Fit results directly constrain the
(\bar\rho,\bar\eta) vertex of the unitarity triangle, and are used to predict
the branching ratios and CP asymmetries of all decay modes, including those of
the B_s system. Different schemes of SU(3) breaking in decay amplitude sizes
are analyzed. The major breaking effect between strangeness-conserving and
strangeness-changing decays can be accounted for by including a ratio of decay
constants in tree and color-suppressed amplitudes. The possibility of having a
new physics contribution to K \pi decays is also examined from the data fitting
point of view.Comment: 22 pages and 2 figures; some comments and references added; more
references added, version to appear in journa
Measurement of B(D+ -> mu+ nu) and the pseudoscalar decay constant f_D at CLEO
The analysis of 60 1/pb data collected on the psi(3770) resonance with the
CLEO-c detector has produced the first statistically significant signal for D+
-> mu+ nu decay and led to the measurement of the decay branching fraction B(D+
-> mu+ nu) = (3.5 +- 1.4 +- 0.6) x 10-4 and the pseudoscalar decay constant f_D
= (202 +- 41 +- 17) MeV.Comment: Talk presented at the 1st Meeting of the APS Topical Group on
Hadronic Physics (Fermilab, Oct. 24-26, 2004). LaTeX 4 pages, 2 figure
Experimental momentum spectra of identified hadrons at colliders compared to QCD calculations
Experimental data on the shape of hadronic momentum spectra are compared to
theoretical predictions in the context of calculations in the Modified Leading
Log Approximation (MLLA), under the assumption of Local Parton Hadron Duality
(LPHD).
Considered are experimental measurements at -colliders of ,
the position of the maximum in the distribution of , where
. The parameter is determined for various hadrons at
various centre of mass energies. The dependence on the hadron type poses some
interesting questions about the process of hadron-formation. The dependence of
on the centre of mass energy is seen to be described adequately by
perturbation theory. A quantitative check of LPHD + MLLA is possible by
extracting a value of from an overall fit to the scaling behaviour
of .Comment: 9 pages latex, 7 eps figures and total ps fil
Prospects for Pentaquark Searches in Annihilations and Collisions
Recent strong experimental evidence of a narrow exotic S = +1 baryon
resonance, , suggests the existence of other exotic baryons. We
discuss the prospects of confirming earlier experimental evidence of
and the observation of additional hypothetical exotic baryons in
annihilations and collisions at LEP and B Factories
Ward Identities, B-> \rho Form Factors and |V_ub|
The exclusive FCNC beauty semileptonic decay B-> \rho is studied using Ward
identities in a general vector meson dominance framework, predicting vector
meson couplings involved. The long distance contributions are discussed which
results to obtain form factors and |V_ub|. A detailed comparison is given with
other approaches.Comment: 30 pages+four postscript figures, an Appendix adde
Heavy Quark Spectroscopy -- Theory Overview
Some recent discoveries in the spectroscopy of hadrons containing heavy
quarks, and some of their theoretical interpretations, are reviewed.Comment: 13 pages, 6 figures. Presented at Second Meeting of APS Topical Group
on Hadron Physics, Nashville, TN, 22-24. Proceedings to be published by
Journal of Physics (UK), Conference Series. Uses jpconf.cls, jpconf11.clo.
Some corrections; references update
Hadron Spectroscopy: Theory and Experiment
Many new results on hadron spectra have been appearing in the past few years
thanks to improved experimental techniques and searches in new channels. New
theoretical techniques including refined methods of lattice QCD have kept pace
with these developments. Much has been learned about states made of both light
(u, d, and s) and heavy (c, b) quarks. The present review treats light-quark
mesons, glueballs, hybrids, particles with a single c or b quark, charmonium,
and bottomonium states. Some prospects for further study are noted.Comment: 29 pages, 9 figures, to be published in Journal of Physics G. Further
updating of reference
Present and Future CP Measurements
We review theoretical and experimental results on CP violation summarizing
the discussions in the working group on CP violation at the UK phenomenology
workshop 2000 in Durham.Comment: 104 pages, Latex, to appear in Journal of Physics