BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//ЛАБОРАТОРИЯ ФИЗИКИ ВЫСОКИХ ЭНЕРГИЙ - ECPv5.8.1//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:ЛАБОРАТОРИЯ ФИЗИКИ ВЫСОКИХ ЭНЕРГИЙ
X-ORIGINAL-URL:https://lhep.jinr.ru
X-WR-CALDESC:События для ЛАБОРАТОРИЯ ФИЗИКИ ВЫСОКИХ ЭНЕРГИЙ
BEGIN:VTIMEZONE
TZID:Europe/Moscow
BEGIN:STANDARD
TZOFFSETFROM:+0300
TZOFFSETTO:+0300
TZNAME:MSK
DTSTART:20250101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20250606T113000
DTEND;TZID=Europe/Moscow:20250606T113000
DTSTAMP:20260517T005637
CREATED:20250530T130044Z
LAST-MODIFIED:20250530T130044Z
UID:3563-1749209400-1749209400@lhep.jinr.ru
SUMMARY:Общелабораторный семинар ЛФВЭ
DESCRIPTION:«Cross section measurements of hard exclusive π0 muoproduction at COMPASS» \nДокладчик: O.Kouznetsov (LHEP JINR) \nАннотация\nA new and detailed measurement of the cross section for hard exclusive neutral-pion muopro-duction on the proton was performed in a wide kinematic region\, with the photon virtuality Q2 ranging from 1 to 8 (GeV/c)2 and the Bjorken variable xBj ranging from 0.02 to 0.45. The data were collected at COMPASS at CERN using 160 GeV/c longitudinally polarized μ± beams scattering off a 2.5~m long liquid hydrogen target. From the average of the measured μ+ and μ− cross sections\, the virtual photon-proton cross section is determined as a function of the squared four-momentum transfer between the initial and final state proton in the range 0.08 (GeV/c)2 < |t| < 0.64 (GeV/c)2. From its angular distribution\, the combined contribution of transversely and longitudinally polarized photons are determined\, as well as transverse-transverse and longitudinal-transverse interference contributions. They are studied as functions of four-momentum transfer |t|\, photon virtuality Q2 and virtual-photon energy ν. The longitudinal-transverse interference contribution is found to be compatible with zero. The significant transverse-transverse interference contribution reveals the existence of a dominant contribution by transversely polarized photons. This provides clear experimental evidence for the chiral-odd GPD ET. In addition\, the existence of a non-negligible contribution of longitudinally polarized photons is suggested by the |t|-dependence of the cross section at xBj < 0.1. Altogether\, these results provide valuable input for future modelling of GPDs and thus of cross sections for exclusive pseudo-scalar meson production. Furthermore\, they can be expected to facilitate the study of next-to-leading order corrections and higher-twist contributions. \nСсылка для подключения:\nhttps://us06web.zoom.us/j/84800006730?pwd=cSsvQXNiK2J6OWM1UDAzY3ZXZ0FPUT09
URL:https://lhep.jinr.ru/event/obshhelaboratornyj-seminar-lfve-35/
LOCATION:конференц-зал корпуса №3 ЛФВЭ
CATEGORIES:Семинар
END:VEVENT
END:VCALENDAR