Fri·Sep 16, 2011Friday·September 16, 2011

1. 01*

   Meson photoproduction from a transversely polarised target at MAMI

   P. Hall Barrientos🇬🇧

   A new transversely polarised frozen spin target has been developed at MAMI which will be used in conjunction with the photon tagger and the Crystal Ball detector. The new target permits a major new programme of accurate measurement of polarisation observables in meson photoproduction. This contribution presents some of the preliminary analysis from experimental data taken near the threshold and in the region of the $\Delta (1232)$ resonance. Observables will be obtained for the $p{\pi }^0$ and $n{\pi }^{+}$ final states.

   nucl-exAIP Conf.Proc.(2012)·0 citations
2. 02*

   Dark Matter Accumulation near the Earth for the Long Range Forces case

   M. S. Onegin🇷🇺 · A. P. Serebrov🇷🇺 · O. M. Zherebtsov🇷🇺

   The accumulation of dark matter near the Earth is considered. We analyze the case of long range interaction forces. Additional density of the dark matter at the Earth's surface is calculated. We show that this density exceeds the mean density of the dark matter in our galaxy by more then $10^5$ times for some values of dark matter particle mass. Accumulation of WIMP's near the Earth by the same mechanism is also analyzed.

   nucl-exastro-ph.CO0 citations
3. 03*

   Quarkonia Measurements with ALICE at the LHC

   Frederick Kramer (for the ALICE Collaboration)

   ALICE is the dedicated heavy-ion experiment at the Large Hadron Collider (LHC). It is designed to provide excellent capabilities to study the quark-gluon plasma (QGP) in the highest energy density regime opened up by the LHC. Quarkonia are crucial probes of the QGP. High-precision data from pp collisions are an essential baseline, and serve as a crucial test for competing models of quarkonium hadroproduction. ALICE measures quarkonia down to pt=0 via their decay channels into e+e- at central (|y|<0.9) and into mu+mu- at forward rapidity (-4.0<y<-2.5). We present first results on the transverse momentum and rapidity distributions of the inclusive J/psi production cross section in sqrt(s)=7 and 2.76 TeV pp collisions. The dependence of the J/psi yield on the charged particle multiplicity in sqrt(s)=7 TeV pp collisions is discussed. Finally, results on the inclusive J/psi production in sqrt(s_NN)=2.76 TeV Pb-Pb collisions, the nuclear modification factor R_AA and the central-to-peripheral modification factor R_CP are shown.

   ↳ hep-exnucl-ex1 citation
4. 04*

   K*Lambda(1116) photoproduction and nucleon resonances

   Sang-Ho Kim🇰🇷 · Seung-il Nam🇰🇷 · Yongseok Oh🇰🇷 · Hyun-Chul Kim🇰🇷

   We study the reaction mechanism of K*Lambda(1116) photoproduction off the proton target near threshold considering the contributions from nucleon-resonances. Employing the effective Lagrangian method at the tree-level Born approximation, we investigate the role of the D13(2080) and the D15(2200). We found that the D13 plays a crucial role to reproduce the experimental data well in the forward scattering region at low energy. We also present theoretical predictions on the single photon-beam asymmetry as well as the energy and angular dependence for the cross sections of this reaction.

   ↳ hep-phhep-exnucl-exnucl-thFew Body Syst.(2013)·0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.