Fri·Sep 19, 2014Friday·September 19, 2014

1. 01*

   Blast-wave model description of the Hanbury-Brown--Twiss radii in pp collisions at LHC energies

   Andrzej Bialas🇵🇱 · Wojciech Florkowski🇵🇱 · Kacper Zalewski🇵🇱

   The blast wave model is applied to the recent data on HBT radii in pp collisions, measured by the ALICE collaboration. A reasonable description of data is obtained for a rather low temperature of the kinetic freeze-out, T ~ 100 MeV, and the transverse profile corresponding to the emission from a shell of a fairly small width 2 d ~ 1.5 fm. The size and the life-time of the produced system are determined for various multiplicities of the produced particles.

   ↳ hep-phnucl-exnucl-thJ.Phys.G(2015)·10 citations
2. 02*

   Applications of Neural Networks in Hadron Physics

   Krzysztof M. Graczyk🇵🇱 · Cezary Juszczak🇵🇱

   The Bayesian approach for the feed-forward neural networks is reviewed. Its potential for usage in hadron physics is discussed. As an example of the application the study of the the two-photon exchange effect is presented. We focus on the model comparison, the estimation of the systematic uncertainties due to the choice of the model, and the over-fitting. As an illustration the predictions of the cross sections ratio $d\sigma (e^{+}p\to e^{+}p)/d\sigma (e^{-}p\to e^{-}p)$ are given together with the estimate of the uncertainty due to the parametrization choice.

   ↳ hep-phnucl-exnucl-thJ.Phys.G(2015)·21 citations
3. 03*

   Heavy ion beam loss mechanisms at an electron-ion collider

   Spencer R. Klein🇺🇸

   There are currently several proposals to build a high-luminosity electron-ion collider, to study the spin structure of matter and measure parton densities in heavy nuclei, and to search for gluon saturation and new phenomena like the colored glass condensate. These measurements require operation with heavy-nuclei. We calculate the cross-sections for two important processes that will affect accelerator and detector operations: bound-free pair production, and Coulomb excitation of the nuclei. Both of these reactions have large cross-sections, 28-56 mb, which can lead to beam ion losses, produce beams of particles with altered charge:mass ratio, and produce a large flux of neutrons in zero degree calorimeters. The loss of beam particles limits the sustainable electron-ion luminosity to levels of several times $10^{32}/$cm${}^2$/s.

   ↳ physics.acc-phnucl-exPhys.Rev.ST Accel.Beams(2014)·9 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.