126415460
Study of B+ ---> p anti-Lambda gamma, p anti-Lambda pi0 and B0 ---> p anti-Lambda pi-
118501601
First observation of CP violation and improved measurement of the branching fraction and polarization of B0→D*+D*− decays
We report the measurement of the branching fraction, the polarization, and the parameters of the time-dependent CP violation in B-0 -> D*(+) D*(-) decays using a data sample of 772 x 10(6)B (B) over bar pairs, collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We obtain a branching fraction of B = (7.82 +/- 0.38 +/- 0.63) x 10(-4), a CP-odd fraction of R-perpendicular to = 0.138 +/- 0.024 +/- 0.006 and, additionally, a fraction of the longitudinal component in the transversity base of R-0 = 0.624 +/- 0.029 +/- 0.011. The measured values of the parameters of the CP violation are SD*+ D*- = 0.79 +/- 0.13 +/- 0.03 and A(D*+ D*-) 0.15 +/- 0.08 +/- 0.04.
124556172
Searches for charmless decays $B^0 \to \eta \omega$, $B^0 \to \eta K^0$, $B^{+} \to \eta \rho^{+}$, and $B^{+} \to \eta^\prime \pi^{+}$
120186826
Physics at BES-III
This physics book provides detailed discussions on important topics in $\tau$-charm physics that will be explored during the next few years at \bes3 . Both theoretical and experimental issues are covered, including extensive reviews of recent theoretical developments and experimental techniques. Among the subjects covered are: innovations in Partial Wave Analysis (PWA), theoretical and experimental techniques for Dalitz-plot analyses, analysis tools to extract absolute branching fractions and measurements of decay constants, form factors, and CP-violation and \DzDzb-oscillation parameters. Programs of QCD studies and near-threshold tau-lepton physics measurements are also discussed.
21907946
Search for T, CP, and CPT violation in B0-B0 mixing with inclusive dilepton events.
We report the results of a search for T, CP, CPT, and violation in B0-B0 mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II factory. Using a sample of 232 x 10(6) BB pairs, we measure the T and CP violation parameter |q/p| - 1 = (-0.8 +/- 2.7(stat) +/- 1.9(syst) x 10(-3), and the CPT and CP parameters Imz = (13.9 +/- 7.3(stat) +/- 3.2(syst)) x 10(-3) and Delta Gamma x Rez = (7.1 +/- 3.9(stat) +/- 2.0(stat)) x 10(-3) ps(-1). The statistical correlation between the measurements of Imz and Delta Gamma x Rez is 76%.
120311240
Observation of $J/\psi \rightarrow p\bar{p}a_{0}(980)$ at BESIII
Using $2.25\times10^{8}$ $J/\psi$ events collected with the BESIII detector at the BEPCII storage rings, we observe for the first time the process $J/\psi\rightarrow p\bar{p}a_{0}(980)$, $a_{0}(980)\rightarrow \pi^{0}\eta$ with a significance of $6.5\sigma$ ($3.2\sigma$ including systematic uncertainties). The product branching fraction of $J/\psi\rightarrow p\bar{p}a_{0}(980)\rightarrow p\bar{p}\pi^{0}\eta$ is measured to be $(6.8\pm1.2\pm1.3)\times 10^{-5}$, where the first error is statistical and the second is systematic. This measurement provides information on the $a_{0}$ production near threshold coupling to $p\bar{p}$ and improves the understanding of the dynamics of $J/\psi$ decays to four body processes.
17647646
Strange quark matter in a chiral SU(3) quark mean field model
We apply the chiral SU(3) quark mean field model to investigate strange quark matter. The stability of strange quark matter with different strangeness fraction is studied. The interaction between quarks and vector mesons destabilizes the strange quark matter. If the strength of the vector coupling is the same as in hadronic matter, strangelets can not be formed. For the case of beta equilibrium, there is no strange quark matter which can be stable against hadron emission even without vector meson interactions.
120021514
Chiral SU(3) quark mean-field model for hadronic systems
We perform a study of infinite hadronic matter and finite nuclei at finite temperature and density with an improved method of calculating the effective baryon mass. A detailed study of the predictions of the model is made in comparison with the available data and the level of agreement is generally very good.
119728121
Coulomb instability of hot nuclei in a chiral symmetry model
A chiral symmetry model for nuclear matter is extended to finite temperature and then used to study the Coulomb instability of hot nuclei. The role of the rho meson degree of freedom is discussed. The calculated limiting temperature is compared with the results obtained from other theories and experiments. [S0556-2813(99)05006-2].
208781283
Observations of Milky Way Dwarf Spheroidal galaxies with the Fermi-LAT detector and constraints on Dark Matter models
We report on the observations of 14 dwarf spheroidal galaxie s with theFermi Gamma-Ray Space Telescope taken during the first 11 months of survey mod e operations. TheFermi telescope, which is conducting an all-sky γ-ray survey in the 20 MeV to>300 GeV energy range, provides a new opportunity to test particle dark matter mode ls through the expected γ-ray emission produced by pair annihilation of weakly interacting ma ssive particles (WIMPs). Local Group dwarf spheroidal galaxies, the largest galactic subs tr ctures predicted by the cold dark 31University of Alabama in Huntsville, Huntsville, AL 35899, USA 32Department of Physics, Center for Cosmology and Astro-Part icle Physics, The Ohio State University, Columbus, OH 43210 , USA 33Department of Physics, Royal Institute of Technology (KTH) , AlbaNova, SE-106 91 Stockholm, Sweden 34UCO/Lick Observatories, Santa Cruz, CA 95064, USA 35Department of Physics, Tokyo Institute of Technology, Megu ro City, Tokyo 152-8551, Japan 36Waseda University, 1-104 Totsukamachi, Shinjuku-ku, Toky o, 169-8050, Japan 37Centre d’́ Etude Spatiale des Rayonnements, CNRS /UPS, BP 44346, F-30128 Toulouse Cedex 4, France Center for Research and Exploration in Space Science and Tec hnology (CRESST), NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, and Università di Trieste, I-34127 Trieste, Italy 40Istituto Nazionale di Fisica Nucleare, Sezione di Roma “Tor Vergata”, I-00133 Roma, Italy 41Department of Physics and Astronomy, University of Denver, Denver, CO 80208, USA 42Max-Planck Institut für extraterrestrische Physik, 8574 8 Garching, Germany 43Institut für Astround Teilchenphysik and Institut für T heoretische Physik, Leopold-Franzens-Universität Inns bruck, A-6020 Innsbruck, Austria 44Institut de Ciencies de l’Espai (IEEC-CSIC), Campus UAB, 08 193 Barcelona, Spain 45Space Sciences Division, NASA Ames Research Center, Mo ffett Field, CA 94035-1000, USA 46NYCB Real-Time Computing Inc., Lattingtown, NY 11560-1025 , USA Department of Chemistry and Physics, Purdue University Cal umet, Hammond, IN 46323-2094, USA 48Institute of Space and Astronautical Science, JAXA, 3-1-1 Y oshinodai, Sagamihara, Kanagawa 229-8510, Japan 49Institució Catalana de Recerca i Estudis Avançats (ICREA ), Barcelona, Spain 50Consorzio Interuniversitario per la Fisica Spaziale (CIFS ), I-10133 Torino, Italy 51University of Maryland, Baltimore County, Baltimore, MD 21 50, USA 52Dipartimento di Fisica, Università di Roma “Tor Vergata”, I-00133 Roma, Italy 53School of Pure and Applied Natural Sciences, University of K almar, SE-391 82 Kalmar, Sweden 54Center for Cosmology, Physics and Astronomy Department, Un iversity of California, Irvine, CA 92697-2575, USA
205218977
A limit on the variation of the speed of light arising from quantum gravity effects
A cornerstone of Einstein’s special relativity is Lorentz invariance—the postulate that all observers measure exactly the same speed of light in vacuum, independent of photon-energy. While special relativity assumes that there is no fundamental length-scale associated with such invariance, there is a fundamental scale (the Planck scale, lPlanck ≈ 1.62 × 10-33 cm or EPlanck = MPlanckc2 ≈ 1.22 × 1019 GeV), at which quantum effects are expected to strongly affect the nature of space–time. There is great interest in the (not yet validated) idea that Lorentz invariance might break near the Planck scale. A key test of such violation of Lorentz invariance is a possible variation of photon speed with energy. Even a tiny variation in photon speed, when accumulated over cosmological light-travel times, may be revealed by observing sharp features in γ-ray burst (GRB) light-curves. Here we report the detection of emission up to ∼31 GeV from the distant and short GRB 090510. We find no evidence for the violation of Lorentz invariance, and place a lower limit of 1.2EPlanck on the scale of a linear energy dependence (or an inverse wavelength dependence), subject to reasonable assumptions about the emission (equivalently we have an upper limit of lPlanck/1.2 on the length scale of the effect). Our results disfavour quantum-gravity theories in which the quantum nature of space–time on a very small scale linearly alters the speed of light.