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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F20%3A00532580" target="_blank" >RIV/68081731:_____/20:00532580 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21340/20:00344586 RIV/46747885:24510/20:00008685 RIV/00216208:11320/20:10414864

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0550321320301255" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0550321320301255</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.nuclphysa.2020.115039" target="_blank" >10.1016/j.nuclphysa.2020.115039</a>

Result language

angličtina

Original language name

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

Original language description

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 (LiD)-Li-6 target. In both cases, the amplitudes of the cos phi(h) and cos 2 phi(h) 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 phi(h) modulation gives indication for a non-zero Boer-Mulders effect.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10303 - Particles and field physics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Nuclear Physics. B

ISSN

0550-3213

e-ISSN

—

Volume of the periodical

956

Issue of the periodical within the volume

JUL

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

14

Pages from-to

115039

UT code for WoS article

000540262200008

EID of the result in the Scopus database

2-s2.0-85084360936