Date: Fri, 28 Jan 11 01:05:55 GMT Subject: nucl-ex daily 1 new + 5 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: nucl-ex@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Wed 26 Jan 11 21:00:00 GMT to Thu 27 Jan 11 21:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1101.5223 Date: Thu, 27 Jan 2011 08:51:26 GMT (2729kb,D) Title: Measurements of di-jets in p+p and Au+Au in the STAR experiment Authors: Elena Bruna for the STAR Collaboration Categories: nucl-ex Comments: Proceedings for Hard Probes 2010 Conference \\ Jets are produced from hard scatterings in the early stages of heavy-ion collisions. It is expected that these high-p$_T$ partons travel through the hot and dense medium before fragmenting. Therefore they are expected to suffer energy loss in the QGP via gluon radiation or elastic collisions along their path. Measurements from full jet reconstruction help in the understanding of energy loss and its effect{\ss} on the jet structure and energy profile. A data-driven characterization of the background in Au+Au is needed in order to compare the results to p+p. The large coverage of the STAR detector along with an online trigger also allows for reconstructing di-jets. Suitable selection of trigger jets allows for studying a subset of jets on the recoil side which are biased towards higher energy loss because of a larger, on average, in-medium path length traversed. Trigger jets are also used to study jet-hadron correlations as an independent measurement to assess the effect of energy loss on the recoil side. We present measurements of di-jets and jet-hadron correlations in the presence of reconstructed di-jets in Au+Au and p+p at 200 GeV in the STAR experiment. \\ ( http://arxiv.org/abs/1101.5223 , 2729kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1101.5194 (*cross-listing*) Date: Thu, 27 Jan 2011 02:02:20 GMT (67kb) Title: Theory of Heavy Flavor in the Quark-Gluon Plasma Authors: Ralf Rapp Categories: nucl-th hep-ph nucl-ex Comments: 8 pages, 10 figures, proceedings of 6th Int. Conf. on Physics and Astrophysics of Quark-Gluon Plasma, Goa (India), Dec. 06-10, 2010 \\ Heavy-quark interactions in the Quark-Gluon Plasma are analyzed in terms of a selfconsistent Brueckner scheme using a thermodynamic $T$-matrix based on a potential model. The interrelations between quarkonium correlators, spectral functions and zero-modes, and open heavy-flavor transport and susceptibilities are elaborated. Independent constraints from thermal lattice QCD can be used to improve predictions for heavy-quark phenomenology in heavy-ion collisions. \\ ( http://arxiv.org/abs/1101.5194 , 67kb) ------------------------------------------------------------------------------ \\ arXiv:1101.5205 (*cross-listing*) Date: Thu, 27 Jan 2011 03:54:27 GMT (2729kb,D) Title: Introduction to dark matter experiments Authors: R. W. Schnee (Syracuse University) Categories: astro-ph.CO hep-ex nucl-ex Comments: 64 pages, 25 figures, based on lectures at 2009 Theoretical Advanced Study Institute in Elementary Particle Physics (TASI), Boulder, Colorado. This posted version benefits from some editing relative to the version in the published proceedings Journal-ref: In Physics of the Large and Small: Proceedings of the 2009 Theoretical Advanced Study Institute in Elementary Particle Physics, pp. 629-681 (World Scientific, Singapore), Ed. Csaba Csaki and Scott Dodelson (2010) \\ This is a set of four lectures presented at the Theoretical Advanced Study Institute (TASI-09) in June 2009. I provide an introduction to experiments designed to detect WIMP dark matter directly, focusing on building intuitive understanding of the characteristics of potential WIMP signals and the experimental techniques. After deriving the characteristics of potential signals in direct-detection experiments for standard WIMP models, I summarize the general experimental methods shared by most direct-detection experiments and review the advantages, challenges, and status of such searches (as of late 2009). Experiments are already probing SUSY models, with best limits on the spin-independent coupling below 10^-7 pb. \\ ( http://arxiv.org/abs/1101.5205 , 2729kb) ------------------------------------------------------------------------------ \\ arXiv:1101.5217 (*cross-listing*) Date: Thu, 27 Jan 2011 07:16:11 GMT (78kb) Title: Nuclear matter symmetry energy and symmetry energy coefficient in mass formula Authors: Lie-Wen Chen Categories: nucl-th astro-ph.SR nucl-ex Comments: 6 pages, 2 figures \\ Within the Skyrme-Hartree-Fock (SHF) approach, we show that for a fixed mass number $A$, both the symmetry energy coefficient $a_{sym}(A)$ in the semi-empirical mass formula and the nuclear matter symmetry energy $E_{sym}({\rho_{A}})$ at a subsaturation reference density $\rho_{A}$ can be determined essentially by the symmetry energy $E_{sym}({\rho_{0}})$ and its density slope $L$ at saturation density ${\rho_{0}}$. Meanwhile, we find the dependence of $a_{sym}(A)$ on $E_{sym}({\rho_{0}})$ or $L$ is approximately linear and is very similar to the corresponding linear dependence displayed by $E_{sym}({\rho_{A}})$, providing an explanation for the relation $E_{sym}({\rho_{A}})\approx a_{sym}(A)$. Our results indicate that a value of $E_{sym}({\rho_{A}})$ can put important constraints on $E_{sym}({\rho_{0}})$ and $L$. Particularly, the values of $E_{sym}({\rho_{0}})=$ $30.5\pm 3$ MeV and $L=$ $52.5\pm 20$ MeV are simultaneously obtained by combining the constraints from recently extracted $E_{sym}({\rho_{A}=0.1}$ {fm}$^{{-3}})$ with those from recent analyses of neutron skin thickness of Sn isotopes in the same SHF approach. \\ ( http://arxiv.org/abs/1101.5217 , 78kb) ------------------------------------------------------------------------------ \\ arXiv:1101.5241 (*cross-listing*) Date: Thu, 27 Jan 2011 10:00:52 GMT (92kb,D) Title: Energy momentum conservation effects on two-particle correlation functions Authors: Nicolas Bock Categories: hep-ex nucl-ex Comments: Proceedings for the VI Workshop on Particle Correlations and Femtoscopy 2010. Kiev, Ukraine September 14-18, 2010 \\ Two particle correlations are used to extract information about the characteristic size of the system in proton-proton and heavy ion collisions. The size of the system can be extracted from the Bose-Einstein quantum mechanical effect for identical particles. However there are also long range correlations that shift the baseline of the correlation function from the expected flat behavior. A possible source of these correlations is the conservation of energy and momentum, especially for small systems, where the energy available for particle production is limited. A new technique, first used by the STAR collaboration, of quantifying these long range correlations using energy-momentum conservation considerations is presented in this talk. Using Monte Carlo simulations of proton-proton collisions at 900 GeV, it is shown that the baseline of the two particle correlation function can be described using this technique. \\ ( http://arxiv.org/abs/1101.5241 , 92kb) ------------------------------------------------------------------------------ \\ arXiv:1101.5350 (*cross-listing*) Date: Thu, 27 Jan 2011 17:56:41 GMT (1344kb) Title: New solution to the puzzle of the long lifetime of 14C Authors: D. Robson Categories: nucl-th nucl-ex Comments: 5 figures \\ A new cluster model solution to the long standing nuclear structure problem of describing the anomalously long lifetime of 14C is presented. Related beta-decay data for 14O to states in 14N, gamma decay data between low lying positive parity states in 14N and the elastic and inelastic magnetic dipole electron scattering from 14N data are all shown to be very accurately described by the model. The shapes of the beta spectra for the A=14 system are also well reproduced by the model. The model invokes four-nucleon tetrahedral symmetric spatial correlations arising from three- and four-nucleon interactions which yields a high degree of SU(4) singlet structure for the clusters and a tetrahedral intrinsic shape for the doubly magic 16O ground state. The large quadrupole moment of the 14N ground state is obtained here for the first time and arises because of the almost 100% d-wave deuteron-like-hole cluster structure inherent in the model. \\ ( http://arxiv.org/abs/1101.5350 , 1344kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1010.5439 (*cross-listing*) replaced with revised version Wed, 26 Jan 2011 21:34:53 GMT (213kb) Title: Strong longitudinal color field effects in pp collisions at energies available at the Large Hadron Collider Authors: V. Topor Pop (1), M. Gyulassy (2), J. Barrette (1), C. Gale (1), A. Warburton ((1) (1) McGill Univ., Canada, (2) Columbia Univ. NY, USA) Categories: hep-ph hep-ex nucl-ex nucl-th Comments: revtex4.1, 11 pages, 11 figures, updated references, slightly text modifications, accepted for publication in Phys. ReV. C (2011) \\ ( http://arxiv.org/abs/1010.5439 , 213kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- For subscribe options to combined physics archives, e-mail To: physics@arXiv.org, Subject: subscribe ----------------------------------------------------------------------------- For help on viewing and making submissions, see http://arXiv.org/help/ For a list of archive mirror sites, see http://arXiv.org/servers.html ----------------------------------------------------------------------------- Third-party submissions cause excessive problems. Author self-submissions are exceedingly preferred. 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