Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS

Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS

Bibliographic Details
Parent link:Nuclear Physics B
Vol. 956.— 2020.— [115039, 14 p.]
Corporate Authors: Национальный исследовательский Томский политехнический университет Школа базовой инженерной подготовки Отделение математики и информатики, Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Other Authors: Agarwala J., Alekseev M. G. Maksim, Alekseev G. D. Gennady, Andrieux V., Chumakov A. G. Aleksandr Grigorjevich, Dusaev R. R. Renat Ramilyevich, Lyubovitskiy (Lyubovitskij) V. E. Valery Efimovich
Summary:Title screen
Hadron leptoproduction in Semi-Inclusive measurements of Deep-Inelastic Scattering (SIDIS) on unpolarised nucleons allows one to get information on the intrinsic transverse momentum of quarks in a nucleon and on the Boer-Mulders function through the measurement of azimuthal modulations in the cross section. These modulations were recently measured by the HERMES experiment at DESY on proton and deuteron targets, and by the COMPASS experiment using the CERN SPS muon beam and a 6LiD target. In both cases, the amplitudes of the cos and cos⁡2 modulations show strong kinematic dependences for both positive and negative hadrons. It has been known since some time that the measured final-state hadrons in those SIDIS experiments receive a contribution from exclusive diffractive production of vector mesons, particularly important at large values of z, the fraction of the virtual photon energy carried by the hadron. In previous measurements of azimuthal asymmetries this contribution was not taken into account, because it was not known that it could distort the azimuthal modulations. Presently, a method to evaluate the contribution of the exclusive reactions to the azimuthal asymmetries measured by COMPASS has been developed. The subtraction of this contribution results in a better understanding of the kinematic effects, and the remaining non-zero cos 2 modulation gives indication for a non-zero Boer-Mulders effect.
Режим доступа: по договору с организацией-держателем ресурса
Published: 2020
Subjects:
электронный ресурс
труды учёных ТПУ
дифракционные процессы
асимметрия
протонные мишени
модуляция
мезоны
Online Access:https://doi.org/10.1016/j.nuclphysb.2020.115039
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=665752

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