Mon·Sep 26, 2016Monday·September 26, 2016

1. 01*

   Measurement of the production of high-$p_{\mathrm{T}}$ electrons from heavy-flavour hadron decays in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV

   ALICE Collaboration

   Electrons from heavy-flavour hadron decays (charm and beauty) were measured with the ALICE detector in Pb-Pb collisions at a centre-of-mass of energy $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV. The transverse momentum ($p_{\mathrm{T}}$) differential production yields at mid-rapidity were used to calculate the nuclear modification factor $R_{\mathrm{AA}}$ in the interval $3<p_{\mathrm{T}}<18$ GeV/$c$. The $R_{\mathrm{AA}}$ shows a strong suppression compared to binary scaling of pp collisions at the same energy (up to a factor of 4) in the 10% most central Pb-Pb collisions. There is a centrality trend of suppression, and a weaker suppression (down to a factor of 2) in semi-peripheral (50-80%) collisions is observed. The suppression of electrons in this broad $p_{\mathrm{T}}$ interval indicates that both charm and beauty quarks lose energy when they traverse the hot medium formed in Pb-Pb collisions at LHC.

   nucl-exhep-exPLB(2017)·55 citations
2. 02*

   Charmonium production in pp collisions with ALICE at the LHC

   Pereira Da Costa Hugo (for the ALICE Collaboration)🇫🇷

   We report on forward-rapidity charmonium production in pp collisions at a center of mass energy $\sqrt{s}=13$ TeV, as measured by ALICE at the LHC. Differential cross sections for both J/{\psi} and {\psi}(2S) are presented as a function of the charmonium transverse momentum and rapidity. Results are compared to similar measurements performed by LHCb, to lower energy measurements and to state of the art model calculations.

   nucl-exJ.Phys.Conf.Ser.(2017)·1 citation
3. 03*

   The nuclear modification of charged particles in Pb-Pb at $\sqrt{{\text{s}}_{\text{NN}}}=\text{5.02}\text{TeV}$ measured with ALICE

   Julius Gronefeld (for the ALICE Collaboration)🇩🇪

   The study of inclusive charged-particle production in heavy-ion collisions provides insights into the density of the medium and the energy-loss mechanisms. The observed suppression of high-${\text{p}}_{\text{T}}$ yield is generally attributed to energy loss of partons as they propagate through a deconfined state of quarks and gluons - Quark-Gluon Plasma (QGP) - predicted by QCD. Such measurements allow the characterization of the QGP by comparison with models. In these proceedings, results on high-${\text{p}}_{\text{T}}$ particle production measured by ALICE in Pb-Pb collisions at $\sqrt{{\text{s}}_{\text{NN}}}=5.02\mathrm{TeV}$ as well as well in pp at $\sqrt{\text{s}}=5.02\mathrm{TeV}$ are presented for the first time. The nuclear modification factors (${\text{R}}_{\text{AA}}$) in Pb-Pb collisions are presented and compared with model calculations.

   nucl-exPoS(2016)·6 citations
4. 04*

   Applicability of pion-nucleus Drell-Yan data in global analysis of nuclear parton distribution functions

   Petja Paakkinen🇫🇮 · Kari J. Eskola🇫🇮 · Hannu Paukkunen🇫🇮

   Despite the success of modern nuclear parton distribution functions (nPDFs) in describing nuclear hard-process data, they still suffer from large uncertainties. One of the poorly constrained features is the possible asymmetry in nuclear modifications of valence $u$ and $d$ quarks. We study the possibility of using pion-nucleus Drell-Yan dilepton data as a new constraint in the global analysis of nPDFs. We find that the nuclear cross-section ratios from the NA3, NA10 and E615 experiments can be used without imposing significant new theoretical uncertainties and, in particular, that these datasets may have some constraining power on the $u$/$d$ -asymmetry in nuclei.

   ↳ nucl-thhep-exhep-phnucl-exPLB(2017)·13 citations
5. 05*

   Sensitivity of (d,p) reactions to high n-p momenta and the consequences for nuclear spectroscopy studies

   G.W. Bailey · N.K. Timofeyuk🇬🇧 · J.A. Tostevin🇬🇧

   Theoretical models of low-energy (d,p) single-neutron transfer reactions are a crucial link between experimentation, nuclear structure and nuclear astrophysical studies. Whereas reaction models that use local optical potentials are insensitive to short-range physics in the deuteron, we show that including the inherent nonlocality of the nucleon-target interactions and realistic deuteron wave functions generates significant sensitivity to high n-p relative momenta and to the underlying nucleon-nucleon interaction. We quantify this effect upon the deuteron channel distorting potentials within the framework of the adiabatic deuteron breakup model. The implications for calculated (d,p) cross sections and spectroscopic information deduced from experiments are discussed.

   ↳ nucl-thnucl-exPRL(2016)·26 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.