BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:QGSJET-III model: novel features DTSTART;VALUE=DATE-TIME:20210609T135000Z DTEND;VALUE=DATE-TIME:20210609T140500Z DTSTAMP;VALUE=DATE-TIME:20260614T103312Z UID:indico-contribution-21-170@indico.nevod.mephi.ru DESCRIPTION:Speakers: Sergey Ostapchenko (SINP MSU)\nI discuss the physics content of the QGSJET-III model\,paying a particular attention to the tre atment of higher twist and color fluctuation effects. The consequences for the energy dependence of both interaction cross sections and particle pro duction will be analyzed. Further\, the implementation of the pion exchang e mechanism will be described\, concentrating on its relevance to the inte rpretation of the data of the LHCf experiment.\n\nhttps://indico.nevod.mep hi.ru/event/6/contributions/170/ LOCATION:Online Zoom URL:https://indico.nevod.mephi.ru/event/6/contributions/170/ END:VEVENT BEGIN:VEVENT SUMMARY:Recent ALICE results on antinuclei inelastic cross sections and th e implications for antinuclei fluxes near Earth DTSTART;VALUE=DATE-TIME:20210609T130000Z DTEND;VALUE=DATE-TIME:20210609T132500Z DTSTAMP;VALUE=DATE-TIME:20260614T103312Z UID:indico-contribution-21-168@indico.nevod.mephi.ru DESCRIPTION:Speakers: Ivan Vorobyev ()\nThe presence of antinuclei in cosm ic rays remains one of the most intriguing questions of modern physics\, w ith several ongoing or planned experiments looking for traces of antinucle i in space near Earth. An observation of antideuteron or antihelium nuclei in cosmic rays would most probably mean a breakthrough in searches for "n ew physics"\, as the antinuclei production from ordinary collisions betwee n cosmic rays and interstellar medium is expected to be very low\, especia lly in the low kinetic energy range. However\, to correctly interpret futu re results\, one needs to know as precisely as possible both the antinucle i production mechanism and their nuclear inelastic cross sections. The lat ter defines the probability that antinuclei produced in the Galaxy can rea ch the detectors near Earth. Unfortunately\, these inelastic cross section s are known very poorly from the experiment\, which hampers precise calcul ations of expected antinuclei fluxes.\n\nThe ALICE collaboration has recen tly performed several measurements of antideuteron and antihelium-3 inelas tic cross sections\, providing the first experimental information of this kind. The antideuteron inelastic cross sections have been measured for the first time in the low momentum range 0.3 < p < 4 GeV/c using collisions a t the LHC as a source of antideuterons and the material of ALICE experimen t as a target. The method has been later extended to antihelium-3 nuclei i n the momentum range of 0.85 < p < 10 GeV/c. The results are compared to t he parameterisations used in Geant4 toolkit\, and in the case of antiheliu m-3 a much steeper rise of the inelastic cross section is observed at low momentum.\n\nWe show how the measurement of antinuclei inelastic cross sec tion with ALICE provides one of the necessary constraints for the study of antinuclei in space. To this purpose\, the impact of ALICE results on the antinuclei fluxes near Earth has been studied using a state-of-the-art pr opagation model implemented in GALPROP framework. The fluxes of antihelium -3 nuclei near Earth have been calculated for typical dark matter scenario s and for collisions of cosmic rays with the interstellar medium. We show that in the case of antihelium-3 stemming from dark matter one loses aroun d half of the antinuclei due to annihilations in collisions with interstel lar gas. As for the background antihelium-3 flux\, this loss is strongly e nergy-dependent\, ranging from 75% at low energies down to around 10% at h igh energies.\n\nhttps://indico.nevod.mephi.ru/event/6/contributions/168/ LOCATION:Online Zoom URL:https://indico.nevod.mephi.ru/event/6/contributions/168/ END:VEVENT BEGIN:VEVENT SUMMARY:Recent developments on EPOS DTSTART;VALUE=DATE-TIME:20210609T140500Z DTEND;VALUE=DATE-TIME:20210609T142000Z DTSTAMP;VALUE=DATE-TIME:20260614T103312Z UID:indico-contribution-21-172@indico.nevod.mephi.ru DESCRIPTION:Speakers: Klaus Werner ()\nCurrently\, EPOS-LHC is the public EPOS version\, heavily used by experimental groups in high energy and cosm ic ray physics. It is based on an S-matrix approach\, being the ideal fram ework for multiple scattering in small systems. However\, factorization an d binary scaling does not come for free\, it is a very complex issue\, and in the current model it is simply not properly done. Another topic concer ns flow\, which is only implemented as "parameterized" which quite limited application. There was substantial progress during the past few year\, re ferred to as "EPOS4 project"\, to develop a consistent formalism\, which a ccommodates a multiple scattering S-matrix approach\, factorization\, and saturation\, all of these topics being closely related to each other. In a ddition\, secondary interactions are considered\, most importantly a full hydrodynamic evolution. In this talk\, we will report about the status of the EPOS4 project.\n\nhttps://indico.nevod.mephi.ru/event/6/contributions/ 172/ LOCATION:Online Zoom URL:https://indico.nevod.mephi.ru/event/6/contributions/172/ END:VEVENT BEGIN:VEVENT SUMMARY:Inelastic diffraction at CMS DTSTART;VALUE=DATE-TIME:20210609T132500Z DTEND;VALUE=DATE-TIME:20210609T135000Z DTSTAMP;VALUE=DATE-TIME:20260614T103312Z UID:indico-contribution-21-169@indico.nevod.mephi.ru DESCRIPTION:Speakers: Lev Kheyn (SINP MSU)\nCMS measurements of inelastic diffraction are reviewed. Agreement of newly\nobtained results on diffract ion in pPb collisions in parallel with\npreviously obtained results on dif fraction in pp collisions with\ngenerators\, in particularly with cosmis r ay generators\, is discussed.\n\nhttps://indico.nevod.mephi.ru/event/6/con tributions/169/ LOCATION:Online Zoom URL:https://indico.nevod.mephi.ru/event/6/contributions/169/ END:VEVENT BEGIN:VEVENT SUMMARY:Comparison of models of nucleus-nucleus interactions implemented i n CORSIKA DTSTART;VALUE=DATE-TIME:20210609T142000Z DTEND;VALUE=DATE-TIME:20210609T143500Z DTSTAMP;VALUE=DATE-TIME:20260614T103312Z UID:indico-contribution-21-171@indico.nevod.mephi.ru DESCRIPTION:Speakers: Roman Nikolaenko ()\nProgram CORSIKA is the unique a nd the most common tool for Monte-Carlo simulation of the formation and de velopment of extensive air showers. CORSIKA offers the user a set of hadro nic interactions models for both high and low energies\, leaving the choic e of the model to the user. Thus the comparison of these models is of part icular interest.\n\nIn the work\, four CORSIKA models for high energy hadr onic interactions are considered: EPOS-LHC\, QGSJET-II\, SIBYLL and DPMJET . These models are used to describe the interactions of protons and nuclei of helium\, nitrogen and iron of primary cosmic rays with nuclei of atmos pheric nitrogen. Checking for laws of energy\, momentum and electric charg e conservation is of primary importance. The comparison of distributions o f the number of secondary particles and the fraction of the collision ener gy they are carrying\, as well as mean values of these quantities has been performed\n\nhttps://indico.nevod.mephi.ru/event/6/contributions/171/ LOCATION:Online Zoom URL:https://indico.nevod.mephi.ru/event/6/contributions/171/ END:VEVENT END:VCALENDAR