Mon·Feb 29, 2016Monday·February 29, 2016

1. 01*

   An event mixing technique for Bose-Einstein correlations of two pions in photoproduction around 1 GeV

   Qing-Hua He🇯🇵 · H. Fujimura🇯🇵 · H. Fukasawa🇯🇵 · R. Hashimoto🇯🇵 · Y. Honda🇯🇵 · T. Ishikawa🇯🇵 · T. Iwata🇯🇵 · S. Kaida🇯🇵 · J. Kasagi🇯🇵 · A. Kawano🇯🇵 · S. Kuwasaki🇯🇵 · K. Maeda🇯🇵 and 23 other authors

   We have developed an event mixing technique to observe Bose-Einstein correlations (BEC) between two identical neutral pions produced in photo-induced reactions in the non-perturbative QCD energy region. It is found that the missing-mass consistency cut and the pion-energy cut are essential for the event mixing method to effectively extract BEC observables. A Monte Carlo (MC) simulation is used to validate these constraints and confirms the efficiency of this method. Our work paves the way for similar BEC studies at lower energies where the multiplicity of emitted bosons is limited.

   nucl-exCPC(2016)·7 citations
2. 02*

   Measuring light-by-light scattering at the LHC and FCC

   David d'Enterria🇨🇭 · Gustavo G. da Silveira🇧🇷

   Elastic light-by-light scattering, $\gamma \gamma \to \gamma \gamma$, can be measured in electromagnetic interactions of lead (Pb) ions at the Large Hadron Collider (LHC) and Future Circular Collider (FCC), using the large (quasi)real photon fluxes available in ultraperipheral collisions. The $\gamma \gamma \to \gamma \gamma$ cross sections for diphoton masses m${}_{\gamma \gamma }>$ 5 GeV in pp, pPb, and PbPb collisions at LHC ($\sqrt{{\mathrm{s}}_{{}_{\mathrm{NN}}}}$ = 5.5, 8.8, 14 TeV) and FCC ($\sqrt{{\mathrm{s}}_{{}_{\mathrm{NN}}}}$ = 39, 63, 100 TeV) center-of-mass energies are presented. The measurement has controllable backgrounds in PbPb collisions, and one expects about 70 and 2500 signal events per year at the LHC and FCC respectively, after typical detector acceptance and reconstruction efficiency selections.

   ↳ hep-phhep-exnucl-exnucl-th6 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.