Date: Mon, 24 Dec 12 01:05:45 GMT Subject: nucl-ex daily 2 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 Thu 20 Dec 12 21:00:00 GMT to Fri 21 Dec 12 21:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1212.5343 Date: Fri, 21 Dec 2012 06:15:55 GMT (93kb) Title: Measurement of transparency ratios for protons from short-range correlated pairs Authors: O. Hen, H. Hakobyan, R. Shneor, E. Piasetzky, L. B. Weinstein, W. K. Brooks, S. May-Tal Beck, S. Gilad, for the CLAS Collaboration Categories: nucl-ex nucl-th Comments: 6 pages, 4 figures \\ Nuclear transparency, Tp(A), is a measure of the average probability for a struck proton to escape the nucleus without significant re-interaction. Previously, nuclear transparencies were extructed for quasi-elastic A(e,e'p) knockout of protons with momentum below the Fermi momentum, where the spectral functions are well known. In this paper we extract a novel observable, the transparency ratio, Tp(A)/T_p(12C), for knockout of high-missing-momentum protons from the breakup of short range correlated pairs (2N-SRC) in Al, Fe and Pb nuclei relative to C. The ratios were measured at momentum transfer Q^2 > 1.5 (GeV/c)^2 and x_B > 1.2 where the reaction is expected to be dominated by electron scattering from 2N-SRC. The transparency ratios of the knocked-out protons coming from 2N-SRC breakup are 20 - 30% lower than those of previous results for low missing momentum. They agree with Glauber calculations and agree with renormalization of the previously published transparencies as proposed by recent theoretical investigations. The new transparencies scale as A^-1/3, which is consistent with dominance of scattering from nucleons at the nuclear surface. \\ ( http://arxiv.org/abs/1212.5343 , 93kb) ------------------------------------------------------------------------------ \\ arXiv:1212.5489 Date: Fri, 21 Dec 2012 15:32:38 GMT (4490kb,D) Title: Azimuthal correlations and collective effects in a heavy-ion collisions at the LHC energies Authors: Ilya Selyuzhenkov Categories: nucl-ex Comments: Talk given at the FAIRNESS 2012 workshop, 3-8 September 2012, Hersonissos, Greece; 5 pages, 5 figures \\ Recent highlights from the anisotropic flow and the azimuthal correlation measurements in a heavy-ion collisions at the LHC are presented. Various flow harmonics measured for the charged and identified particles versus transverse momentum, pseudo-rapidity, and the collision centrality are reported. New experimental probes of the local parity violation at the LHC energies using the charge dependent azimuthal correlations are also discussed. \\ ( http://arxiv.org/abs/1212.5489 , 4490kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1212.5388 (*cross-listing*) Date: Fri, 21 Dec 2012 10:37:56 GMT (26kb) Title: Initial state fluctuations and final state correlations: Status and open questions Authors: Andrew Adare, Matthew Luzum and Hannah Petersen Categories: nucl-th hep-ph nucl-ex Comments: 10 pages, summary of the major findings and discussions of the workshop "Initial State Fluctuations and Final State Correlations", held at ECT* in Trento in July, 2012 \\ The recent appreciation of the importance of event-by-event fluctuations in relativistic heavy-ion collisions has lead to a large amount of diverse theoretical and experimental activity. In particular, there is significant interest in understanding the fluctuations in the initial stage of a collision, how exactly these fluctuations are propagated through the system evolution, and how they are manifested in correlations between measured particles. In order to address these questions a workshop was organized on "Initial State Fluctuations and Final State Correlations", held at ECT* in Trento, Italy during the week of 2--6 July, 2012. The goal was to collect recent work in order to provide a coherent picture of the current status of our understanding, to identify important questions that remain open, and to set a course for future research. Here we report the outcome of the presentations and discussions, focusing on the most important conclusions. \\ ( http://arxiv.org/abs/1212.5388 , 26kb) ------------------------------------------------------------------------------ \\ arXiv:1212.5407 (*cross-listing*) Date: Fri, 21 Dec 2012 11:54:55 GMT (260kb,D) Title: Multiplicities of charged pions and kaons from semi-inclusive deep-inelastic scattering by the proton and the deuteron Authors: HERMES Collaboration: A. Airapetian, N. Akopov, Z. Akopov, E. C. Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetisyan, S. Belostotski, H. P. Blok, A. Borissov, J. Bowles, I. Brodski, V. Bryzgalov, J. Burns, M. Capiluppi, G. P. Capitani, E. Cisbani, G. Ciullo, M. Contalbrigo, P. F. Dalpiaz, W. Deconinck, R. De Leo, L. De Nardo, E. De Sanctis, M. Diefenthaler, P. Di Nezza, M. D\"uren, M. Ehrenfried, G. Elbakian, F. Ellinghaus, R. Fabbri, A. Fantoni, L. Felawka, S. Frullani, D. Gabbert, G. Gapienko, V. Gapienko, F. Garibaldi, G. Gavrilov, V. Gharibyan, F. Giordano, S. Gliske, M. Golembiovskaya, C. Hadjidakis, M. Hartig, D. Hasch, A. Hillenbrand, M. Hoek, Y. Holler, I. Hristova, Y. Imazu, A. Ivanilov, A. Izotov, H. E. Jackson, H. S. Jo, S. Joosten, R. Kaiser, G. Karyan, T. Keri, E. Kinney, A. Kisselev, N. Kobayashi, V. Korotkov, V. Kozlov, P. Kravchenko, V. G. Krivokhijine, L. Lagamba, L. Lapik\'as, I. Lehmann, P. Lenisa, A. L\'opez Ruiz, W. Lorenzon, B.-Q. Ma, D. Mahon, B. Maiheu, N. C. R. Makins, S. I. Manaenkov, L. Manfr\'e, Y. Mao, B. Marianski, A. Martinez de la Ossa, H. Marukyan, C. A. Miller, Y. Miyachi, A. Movsisyan, M. Murray, A. Mussgiller, E. Nappi, Y. Naryshkin, A. Nass, M. Negodaev, W.-D. Nowak, L. L. Pappalardo, R. Perez-Benito, A. Petrosyan, M. Raithel, P. E. Reimer, A. R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, J. Rubin, D. Ryckbosch, Y. Salomatin, F. Sanftl, A. Sch\"afer, G. Schnell, B. Seitz, T.-A. Shibata, V. Shutov, M. Stancari, M. Statera, E. Steffens, J. J. M. Steijger, J. Stewart, F. Stinzing, S. Taroian, A. Terkulov, R. Truty, A. Trzcinski, M. Tytgat, Y. Van Haarlem, C. Van Hulse, D. Veretennikov, I. Vilardi, C. Vogel, S. Wang, S. Yaschenko, Z. Ye, S. Yen, W. Yu, V. Zagrebelnyy, D. Zeiler, B. Zihlmann, P. Zupranski Categories: hep-ex nucl-ex Report-no: DESY 12-157 \\ Multiplicities in semi-inclusive deep-inelastic scattering are presented for each charge state of \pi^\pm and K^\pm mesons. The data were collected by the HERMES experiment at the HERA storage ring using 27.6 GeV electron and positron beams incident on a hydrogen or deuterium gas target. The results are presented as a function of the kinematic quantities x_B, Q^2, z, and P_h\perp. They represent a unique data set for identified hadrons that will significantly enhance our understanding of the fragmentation of quarks into final-state hadrons in deep-inelastic scattering. \\ ( http://arxiv.org/abs/1212.5407 , 260kb) ------------------------------------------------------------------------------ \\ arXiv:1212.5419 (*cross-listing*) Date: Fri, 21 Dec 2012 13:00:30 GMT (1261kb) Title: Two-particle photodisintegration of He-4: He-4(gamma,d)d, He-4(gamma,p)T, He-4(gamma,n)He-3 Authors: O. E. Koshchii, P. E. Kuznietsov, Yu. A. Kasatkin Categories: nucl-th nucl-ex Comments: 13 pages, 8 figures, To be published in NPA \\ Using a covariant diagram technique and the concept of a nucleus as an elementary particle we calculated differential cross-sections for two-particle photodisintegration reactions of the He-4. The only functional parameter was the vertex structure function, which described the "collapse" of a He-4 nucleus and the nucleon remnants. The interaction of a real photon was determined by the value of particles charge, since the electromagnetic form factors were calculated in the photon point. The inseparability property of the electric charge from the particle mass allowed us to match the energy-momentum and charge conservation laws in the interaction. Therefore, the requirement of gauge symmetry was immediately satisfied. The covariant amplitude of the process equaled to the sum of pole diagrams and regular part. \\ ( http://arxiv.org/abs/1212.5419 , 1261kb) ------------------------------------------------------------------------------ \\ arXiv:1212.5475 (*cross-listing*) Date: Fri, 21 Dec 2012 15:08:28 GMT (128kb) Title: Diffractive production of charm quark/antiquark pairs at RHIC and LHC Authors: Marta Luszczak and Antoni Szczurek Categories: hep-ph hep-ex nucl-ex Comments: 4 pages, 5 figures, talk given by M. Luszczak at International Workshop on Diffraction in High-Energy Physics, DIFFRACTION 2012, Puerto del Carmen, Lanzarote. (Canary Islands), Spain. September 10 - 15, 2012 \\ We have discussed single and central diffractive production of $c \bar c$ pairs in the Ingelman-Schlein model. In these calculations we have included diffractive parton distributions obtained by the H1 collaboration at HERA and absorption effects neglected in some early calculations in the literature. The absorption effects which are responsible for the naive Regge factorization breaking cause that the cross section for diffractive processes is much smaller than that for the fully inclusive case, but could be measured at RHIC and LHC by imposing special condition on rapidity gaps. We discuss also different approaches to diffractive production of heavy quark/antiquark. The particular mechanism is similar to the diffractive dissociation of virtual photons into quarks, which drives diffractive deep inelastic production of charm in the low-mass diffraction, or large $\beta$-region. \\ ( http://arxiv.org/abs/1212.5475 , 128kb) ------------------------------------------------------------------------------ \\ arXiv:1212.5544 (*cross-listing*) Date: Fri, 21 Dec 2012 18:28:34 GMT (1120kb,D) Title: Revisiting f_B and m_b(m_b) from HQET spectral sum rules Authors: Stephan Narison (LUPM-CNRS Montpellier-FR) Categories: hep-ph hep-ex hep-lat nucl-ex Comments: 8pages, 9 figures, 5 tables \\ Using recent values of the QCD (non-) perturbative parameters given in Table 1, we reconsider the extraction of f_B and the on-shell mass M_b from HQET Laplace spectral sum rules known to N2LO PT series and including dimension 7 condensates in the OPE. We especially study the convergence of the PT series, the effects on "different spectral sum rules data" of the continuum threshold and subtraction point varied in a larger range than in the existing literature and include in the error an estimate of the N3LO PT series based on a geometric growth of the PT series. We obtain the Renormalization Group Invariant (RGI) universal coupling : f_B^infinity=0.407(28) GeV^3/2 in the static limit M_b to infinity and the physical decay constant including 1/M_b corrections: f_B^hqet=197(13) MeV. Using the ratio of sum rules, we obtain the on-shell b quark mass M_b=4871(30) MeV to order alpha_s^2 from which we deduce the running mass m_b(m_b)=4234(56) MeV. The previous results are in good agreement with the ones from QCD spectral sum rules (QSSR) in full QCD to the same order [1]: f_B^qcd=206(7) MeV and m_b(m_b)^qcd=4236(69) MeV from the same channel. Using in addition the value m_b(m_b)=4177(11) MeV from the \Upsilon sum rules to order alpha_s^3 [2], we deduce the final averaged estimate from QSSR: f_B^qssr=204(6) MeV and m_b(m_b)^qssr=4181(11) MeV. \\ ( http://arxiv.org/abs/1212.5544 , 1120kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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. E-mail submissions have been discontinued in favor of better support for Web submissions. 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