Results 1 - 10 of 10967
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[en] We report a new measurement of Rc using data obtained with the SLD detector in 1993-1996. This measurement uses a double tag technique, where the selection of a c hemisphere is based on the reconstructed mass of the charm hadron decay vertex. The method utilizes the 3D vertexing capabilities of SLD's CCD vertex detectors and the small and stable SLC beams to obtain a high c-tagging efficiency and purity of 14% and 68%, respectively. We obtain a preliminary combined 93-96 result of Rc = 0.181 ± 0.012stat. ± 0.008syst.
[en] We give an overview of the possible phase structure of dense hadronic matter with T < Tc and μQ ≥ ΛQCD, arguing for the possibility of a percolating transition in the T, μQ, Nc space. We show that matter after this phase transition has many properties associated with ''quarkyonic'' matter. Finally, we show how the existence of this phase can be experimentally investigated using electromagnetic signatures. The details of these calculations are in [1, 2, 3, 4]
[en] We present a mini-review on charm spectroscopy at the BABAR experiment. We first report on the c(bar s) meson spectrum, and present precise measurements of the Ds1(2536) meson as well as the properties of the many new states discovered since 2003 (D*s0(2317), Ds1(2460), D*sJ(2860), and DsJ(2700) mesons). We then discuss about charmed baryons observed recently in the BABAR experiment: (Omega)c0 and (Omega)*c0 css baryons, Λc(2940)+ udc baryon and the Ξc usc/dsc baryons
[en] The B factories, KEKB and PEPII, provide enormous samples of charmed mesons and baryons as well as B(bar B) events. The BELLE and BaBar collaborations have discovered many new particles containing charm quarks in the last few years and have measured their properties with increasing precision. The current status and most recent studies of these charm particle properties is briefly reviewed
[en] Charm quarks are mostly produced in the pre-equilibrium phase of relativistic heavy ion collisions and primarily due to prompt gluon fusion and interactions among high energy partons. The produced charm quarks undergo modification while moving through quark gluon plasma. Consequently studies of charm spectra via its mesonic channels and their decay product give information on the medium properties. We present results on the modification of heavy quark energy and momentum spectra due to hot and dense medium (QGP) at LHC collider energies. (author)
[en] The in-medium properties of the heavy spin-3/2 , and baryons with Q being b or c quark are investigated. The shifts in some spectroscopic parameters of these particles due to the saturated cold nuclear matter are calculated. The variations of those parameters with respect to the changes in the density of the cold nuclear medium are studied, as well. It is observed that the parameters of baryons are considerably affected by the nuclear matter compared to the and particles that roughly do not see the medium. The results obtained may be used in analyses of the data to be provided by the in-medium experiments like PANDA.
[en] This paper describes the measurement of J/ψ inclusive, prompt and non-prompt cross section using the dimuon channel in the CMS experiment with the first 314 nb-1 of LHC data. An important contribution to the systematic uncertainty is given by the unknown polarization of the prompt J/ψ, in particular for what concerns the measurement of the detector acceptance. A complex framework for a measure of the prompt J/ψ polarization has been developed by the CMS collaboration and a measure of the angular parameters is foreseen in the close future. A brief description of the main issues of the polarization measurement is also given.