@article{717f159c9fc1495ab15c88776d843ee5,
title = "Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS",
abstract = "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 cosϕh and cos2ϕh 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 cos2ϕh modulation gives indication for a non-zero Boer-Mulders effect.",
author = "{The COMPASS Collaboration} and J. Agarwala and Alexeev, {M. G.} and Alexeev, {G. D.} and A. Amoroso and V. Andrieux and Anfimov, {N. V.} and V. Anosov and A. Antoshkin and K. Augsten and W. Augustyniak and Azevedo, {C. D.R.} and B. Bade{\l}ek and F. Balestra and M. Ball and J. Barth and R. Beck and Y. Bedfer and {Berenguer Antequera}, J. and J. Bernhard and M. Bodlak and P. Bordalo and F. Bradamante and A. Bressan and M. B{\"u}chele and Burtsev, {V. E.} and Chang, {W. C.} and C. Chatterjee and M. Chiosso and Chumakov, {A. G.} and Chung, {S. U.} and A. Cicuttin and Correia, {P. M.M.} and Crespo, {M. L.} and D. D'Ago and {Dalla Torre}, S. and Dasgupta, {S. S.} and S. Dasgupta and I. Denisenko and Denisov, {O. Yu} and L. Dhara and Donskov, {S. V.} and N. Doshita and Ch Dreisbach and W. D{\"u}nnweber and Dusaev, {R. R.} and A. Efremov and {Grosse Perdekamp}, M. and N. Makins and Peng, {J. C.} and C. Riedl",
note = "Supported by BMBF - Bundesministerium f\u00FCr Bildung und Forschung (Germany).Supported by FP7, HadronPhysics3, Grant 283286 (European Union).Supported by MEYS, Grant LM20150581 (Czech Republic).Supported by B. Sen fund (India).Supported by CERN-RFBR Grant 12-02-91500.Supported by FCT, Grants CERN/FIS-PAR/0007/2017 and CERN/FIS-PAR/0022/2019 (Portugal).Supported by MEXT and JSPS, Grants 18002006, 20540299, 18540281 and 26247032, the Daiko and Yamada Foundations (Japan).Supported by the DFG cluster of excellence \u2018Origin and Structure of the Universe\u2019 (www.universe-cluster.de) (Germany).Supported by the Ministry of Science and Technology (Taiwan).Supported by the Israel Academy of Sciences and Humanities (Israel).Supported by the Russian Federation program \u201CNauka\u201D (Contract No. 0.1764.GZB.2017) (Russia).Supported by the National Science Foundation, Grant no. PHY-1506416 (USA).Supported by NCN, Grant 2017/26/M/ST2/00498 (Poland).Supported by the DFG Research Training Group Programmes 1102 and 2044 (Germany).Supported by ANR, France with P2IO LabEx (ANR-10-LABX-0038) in the framework \u201CInvestissements d'Avenir\u201D (ANR-11-IDEX-0003-01).",
year = "2020",
month = jul,
doi = "10.1016/j.nuclphysb.2020.115039",
language = "English (US)",
volume = "956",
journal = "Nuclear Physics B",
issn = "0550-3213",
publisher = "Elsevier B.V.",
}