Tue·Jul 11, 2017Tuesday·July 11, 2017

1. 01*

   The meaning behind observed $p_T$ regions at the LHC energies

   M.K. Suleymanov (COMSATS Institute of Information Technology, Islamabad Pakistan)🇵🇰

   We argue that $p_T$ distribution data from the LHC on the invariant differential yield of the charged primary particles in $pp$ collisions at $\sqrt{s}=0.9TeV,2.76TeV,7TeV$ and in $Pb-Pb$ collisions at $\sqrt{s_{NN}}=2.76TeV$ with 6 centrality bins contains several $p_T$ regions with special properties. These distributions were analysed by fitting the data with exponential functions. We conclude that the regions reflect features of fragmentation and hadronization of partons through the string dynamics. The nuclear transparency results in negligible influence of the medium in the III region ($p_T>17-20GeV/c$), which has highest $p_T$ values. The effects and changes by the medium start to appear weakly in the II region ($4-6GeV/c<p_T<17-20GeV/c$) and become stronger in the I region ($p_T<4-6GeV/c$) . It seems that the II region has highest number of strings. The increase in string density in this region could lead to fusion of strings, appearance of a new string and collective behaviour of the partons in the most central collisions. These phenomena can explain anomalous behaviour of the Nuclear Modification Factor in the II region. We propose the II region as a possible area of Quark Gluon Plasma formation through string fusion. The first $p_T$ regions are the ones with the maximum number of hadrons and minimum number of strings due to direct hadronization of the low energy strings into two quark systems - mesons.

   nucl-exIJMPE(2018)·28 citations
2. 02*

   Rapidity dependence of proton cumulants and correlation functions

   Adam Bzdak🇵🇱 · Volker Koch🇺🇸

   The dependence of multi-proton correlation functions and cumulants on the acceptance in rapidity and transverse momentum is studied. We find that the preliminary data of various cumulant ratios are consistent, within errors, with rapidity and transverse momentum independent correlation functions. However, rapidity correlations which moderately increase with rapidity separation between protons are slightly favored. We propose to further explore the rapidity dependence of multi-particle correlation functions by measuring the dependence of the integrated reduced correlation functions as a function of the size of the rapidity window.

   ↳ nucl-thhep-exhep-phnucl-exPRC(2017)·37 citations
3. 03*

   Study of prompt D${}^0$ meson production in pPb collisions at $\sqrt{s}$=5 TeV

   LHCb collaboration: R. Aaij🇨🇭 · B. Adeva🇪🇸 · M. Adinolfi🇬🇧 · Z. Ajaltouni🇫🇷 · S. Akar🇺🇸 · J. Albrecht🇩🇪 · F. Alessio🇨🇭 · M. Alexander🇬🇧 · A. Alfonso Albero🇪🇸 · S. Ali🇳🇱 · G. Alkhazov🇷🇺 · P. Alvarez Cartelle🇬🇧 and 799 other authors

   Production of prompt D${}^0$ mesons is studied in proton-lead and lead-proton collisions recorded at the LHCb detector at the LHC. The data sample corresponds to an integrated luminosity of $1.58\pm 0.02$ nb${}^{-1}$ recorded at a nucleon-nucleon centre-of-mass energy of $\sqrt{s}=5$ TeV. Measurements of the differential cross-section, the forward-backward production ratio and the nuclear modification factor are reported using D${}^0$ candidates with transverse momenta less than 10 GeV/c and rapidities in the ranges $1.5<y^{\ast }<4.0$ and $-5.0<y^{\ast }<-2.5$ in the nucleon-nucleon centre-of-mass system.

   ↳ hep-exnucl-exJHEP(2017)·189 citations
4. 04*

   Magnetic moments of the doubly charmed and bottomed baryons

   Hao-Song Li🇨🇳 · Lu Meng🇨🇳 · Zhan-Wei Liu🇨🇳 · Shi-Lin Zhu🇨🇳

   The chiral corrections to the magnetic moments of the spin-$\frac{1}{2}$ doubly charmed baryons are systematically investigated up to next-to-next-to-leading order with heavy baryon chiral perturbation theory (HBChPT). The numerical results are calculated up to next-to-leading order: ${\mu }_{{\Xi }_{cc}^{++}}=-0.25{\mu }_N$, ${\mu }_{{\Xi }_{cc}^{+}}=0.85{\mu }_N$, ${\mu }_{{\Omega }_{cc}^{+}}=0.78{\mu }_N$. We also calculate the magnetic moments of the other doubly heavy baryons, including the doubly bottomed baryons (bbq) and the doubly heavy baryons containing a light quark, a charm quark and a bottom quark ($\{bc\}q$ and $[bc]q$): ${\mu }_{{\Xi }_{bb}^0}=-0.84{\mu }_N$, ${\mu }_{{\Xi }_{bb}^{-}}=0.26{\mu }_N$, ${\mu }_{{\Omega }_{bb}^{-}}=0.19{\mu }_N$, ${\mu }_{{\Xi }_{\{bc\}q}^{+}}=-0.54{\mu }_N$, ${\mu }_{{\Xi }_{\{bc\}q}^0}=0.56{\mu }_N$, ${\mu }_{{\Omega }_{\{bc\}q}^0}=0.49{\mu }_N$, ${\mu }_{{\Xi }_{[bc]q}^{+}}=0.69{\mu }_N$, ${\mu }_{{\Xi }_{[bc]q}^0}=-0.59{\mu }_N$, ${\mu }_{{\Omega }_{[bc]q}^0}=0.24{\mu }_N$.

   ↳ hep-phhep-exhep-latnucl-ex+1PRD(2017)·66 citations
5. 05*

   Probing Saturation Physics in the Real Compton Scattering at Ultraperipheral $pPb$ Collisions

   V. P. Goncalves🇧🇷 · F. S. Navarra🇧🇷 · D. Spiering🇧🇷

   The Real Compton Scattering in ultraperipheral $pPb$ collisions at RHIC and LHC energies is investigated and predictions for the squared transverse momentum ($t$) and rapidity ($Y$) distributions are presented. The scattering amplitude is assumed to be given by the sum of the Reggeon and Pomeron contributions and the Pomeron one is described by the Color Dipole formalism taking into account the non - linear (saturation) effects in the QCD dynamics. We demonstrate that the behaviour of the cross sections at large -- $t$ and/or $Y$ is dominated by the Pomeron contribution and is strongly affected by the non -- linear effects present in the QCD dynamics. These results indicate that a future experimental analysis of this process can be useful to probe the QCD dynamics at high energies.

   ↳ hep-phhep-exnucl-exnucl-thPLB(2017)·2 citations
6. 06*

   Light-nuclei spectra from chiral dynamics

   M. Piarulli🇺🇸 · A. Baroni🇺🇸 · L. Girlanda🇮🇹 · A. Kievsky🇮🇹 · A. Lovato🇺🇸 · Ewing Lusk🇺🇸 · L.E. Marcucci🇮🇹 · Steven C. Pieper🇺🇸 · R. Schiavilla🇺🇸 · M. Viviani🇮🇹 · R.B. Wiringa🇺🇸

   A major goal of nuclear theory is to explain the spectra and stability of nuclei in terms of effective many-body interactions amongst the nucleus' constituents-the nucleons, i.e., protons and neutrons. Such an approach, referred to below as the basic model of nuclear theory, is formulated in terms of point-like nucleons, which emerge as effective degrees of freedom, at sufficiently low energy, as a result of a decimation process, starting from the fundamental quarks and gluons, described by Quantum Chromodynamics (QCD). A systematic way to account for the constraints imposed by the symmetries of QCD, in particular chiral symmetry, is provided by chiral effective field theory, in the framework of a low-energy expansion. Here we show, in quantum Monte Carlo calculations accurate to $\le 2\%$ of the binding energy, that two- and three-body chiral interactions fitted {\sl only} to bound- and scattering-state observables in, respectively, the two- and three-nucleon sectors, lead to predictions for the energy levels and level ordering of nuclei in the mass range $A$=4-12 in very satisfactory agreement with experimental data. Our findings provide strong support for the fundamental assumptions of the basic model, and pave the way to its systematic application to the electroweak structure and response of these systems as well as to more complex nuclei.

   ↳ nucl-thnucl-exPRL(2018)·176 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.