2,134 research outputs found
Final State Interactions in Hadronic D decays
We show that the large corrections due to final state interactions (FSI) in
the D^+\to \pi^-\pi^+\pi^+, D^+_s\to \pi^-\pi^+\pi^+, and D^+\to K^-\pi^+\pi^+
decays can be accounted for by invoking scattering amplitudes in agreement with
those derived from phase shifts studies. In this way, broad/overlapping
resonances in S-waves are properly treated and the phase motions of the
transition amplitudes are driven by the corresponding scattering matrix
elements determined in many other experiments. This is an important step
forward in resolving the puzzle of the FSI in these decays. We also discuss why
the \sigma and \kappa resonances, hardly visible in scattering experiments, are
much more prominent and clearly visible in these decays without destroying the
agreement with the experimental \pi\pi and K\pi low energy S-wave phase shifts.Comment: 22 pages, 6 figures, 5 tables. Minor changes. We extend the discusion
when quoting a reference and we include a new one. Some typos are fixe
A preliminary osteological analysis of the University of Missouri anatomy osteology collection
The University of Missouri Anatomy Osteology Collection consists of 97 human skeletons used extensively for anatomy-based education and research. Despite the size and utility of the collection, no information regarding the demographics of the collection has previously been available. Using standard osteological techniques, a preliminary investigation was initiated to ascertain the sex, age at death, and degree of preservation of each specimen in the collection
Duality Violation and the K --> pi pi Electroweak Penguin Operator Matrix Elements from Hadronic Tau Decays
We discuss a preliminary study of the impact of duality violations on
extractions from tau decay data of the D=6 VEVs which determine chiral limit
Standard Model K-->pi pi matrix elements of the electroweak penguin operators.Comment: 4 pages, 5 figures, prepared for the Proceedings of the 11th Particle
and Nuclear Intersections Conference (PANIC 2011), Boston, USA, July 24-29,
201
Upsilon Dissociation in Quark-Gluon Plasma
I consider the dissociation of the upsilon meson due to absorption of a
thermal gluon. I discuss the dissociation rate in terms of the energy density,
the number density, and the temperature of the quark-gluon plasma. I compare
this to the effect due to screening.Comment: 5 pages, added calculations on screening; added figur
QCD sum rule analysis of the field strength correlator
The gauge invariant two-point correlator for the gluon field strength tensor
is analysed by means of the QCD sum rule method. To this end, we make use of a
relation of this correlator to a two-point function for a quark-gluon hybrid in
the limit of the quark mass going to infinity. From the sum rules a relation
between the gluon correlation length and the gluon condensate is obtained. We
briefly compare our results to recent determinations of the field strength
correlator on the lattice.Comment: 16 pages, 1 figur
Supervisi Pengawas Madrasah Dalam Meningkatkan Kompetensi Profesional Guru Pada Min Meulaboh Kabupaten Aceh Barat
: Teaching supervision is one way to assist teachers in performing their duties as a professional teacher. The purpose of this research was to obtain complete data on the implementation of the teaching supervision by the supervisor in order to improve the professional competence of teachers in State Islamic Elementary School Meulaboh of Aceh Barat Regency. The approach used in this study is a qualitative approach. Data collection techniques used were observation, interview, and documentary study. Subjects of the study were school supervisor, principal and teachers. This study concludes that, teaching supervision programs compiled by the supervisor were semester program and annual program that included the coaching of teacher performance in group and individual. Teaching supervision was done through classroom observation, individual meetings, group discussions and demonstrations of teaching. Obstacles faced were the lack of supervisory personnel, lack of knowledge of the teachers about the management of teaching and learning, limited learning facilities and infrastructure, lack of ability of the teacher in preparing learning program, lack of teachers using instructional media. Supervision was conducted by using class visit, debriefing and discussion technique
Possible explanation of the discrepancy of the light-cone QCD sum rule calculation of g(D*Dpi) coupling with experiment
The introduction of an explicit negative radial excitation contribution in
the hadronic side of the light cone QCD sum rule (LCSR) of Belyaev, Braun,
Khodjamirian and Ruckl, can explain the large experimental value of g(D*Dpi),
recently measured by CLEO. At the same time, it considerably improves the
stability of the sum rule when varying the Borel parameter.Comment: 9 pages, 1 PostScript figure
Meson resonances, large N_c and chiral symmetry
We investigate the implications of large N_c and chiral symmetry for the mass
spectra of meson resonances. Unlike for most other mesons, the mass matrix of
the light scalars deviates strongly from its large-N_c limit. We discuss the
possible assignments for the lightest scalar nonet that survives in the
large-N_c limit.Comment: 14 page
NonQCD contributions to heavy quark masses and sensitivity to Higgs mass
We find that if the Higgs mass is close to its present experimental lower
limit (100 GeV),Yukawa interactions in the quark-Higgs sector can make
substantial contributions to the heavy quark MS masses.Comment: 16 pages, 1 figure. Fixed a few typos (eqs (7),(34)
The Kappa in J/Psi -> Kpplus-piminus-Kminus-piplus
BES II data for J/Psi->K*(890)Kpi reveal a strong kappa peak in the Kpi
S-wave near threshold. Both magnitude and phase are determined in slices of Kpi
mass by interferences with strong Ko(1430), K1(1270) and K1(1400) signals. The
phase variation with mass agrees within errors with LASS data for Kpi elastic
scattering. A combined fit is presented to both BES and LASS data. The fit uses
a Breit-Wigner amplitude with an s-dependent width containing an Adler zero.
The kappa pole is at 760+-20(stat)+-40(syst) - i(420+-45+-60syst) MeV. The
S-wave I=0 scattering length a_0 = 0.23+-0.04 (in units of m(pi)) is close to
the prediction 0.19+-0.02 of Chiral Perturbation Theory.Comment: 20 pages, 5 figure
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