Exclusive ω meson muoproduction on transversely polarised protons

The COMPASS Collaboration

doi:10.1016/j.nuclphysb.2016.12.015

Exclusive ω meson muoproduction on transversely polarised protons

The COMPASS Collaboration

Research output: Contribution to journal › Article › peer-review

Abstract

Exclusive production of ω mesons was studied at the COMPASS experiment by scattering 160 GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality 1 (GeV/c)²<Q²<10 (GeV/c)², Bjorken scaling variable 0.003<x_Bj<0.3 and transverse momentum squared of the ω meson 0.05 (GeV/c)²<p_T ²<0.5 (GeV/c)². The measured asymmetries are sensitive to the nucleon helicity-flip Generalised Parton Distributions (GPD) E that are related to the orbital angular momentum of quarks, the chiral-odd GPDs H_T that are related to the transversity Parton Distribution Functions, and the sign of the πω transition form factor. The results are compared to recent calculations of a GPD-based model.

Original language	English
Pages (from-to)	454-475
Number of pages	22
Journal	Nuclear Physics B
Volume	915
DOIs	https://doi.org/10.1016/j.nuclphysb.2016.12.015
Publication status	Published - 1 Feb 2017
Externally published	Yes

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@article{1d03fb01adc649d19e016649f8770689,

title = "Exclusive ω meson muoproduction on transversely polarised protons",

abstract = "Exclusive production of ω mesons was studied at the COMPASS experiment by scattering 160 GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality 1 (GeV/c)22<10 (GeV/c)2, Bjorken scaling variable 0.003Bj<0.3 and transverse momentum squared of the ω meson 0.05 (GeV/c)2T 2<0.5 (GeV/c)2. The measured asymmetries are sensitive to the nucleon helicity-flip Generalised Parton Distributions (GPD) E that are related to the orbital angular momentum of quarks, the chiral-odd GPDs HT that are related to the transversity Parton Distribution Functions, and the sign of the πω transition form factor. The results are compared to recent calculations of a GPD-based model.",

author = "\{The COMPASS Collaboration\} and C. Adolph and M. Aghasyan and R. Akhunzyanov and Alexeev, \{M. G.\} and Alexeev, \{G. D.\} and A. Amoroso and V. Andrieux and Anfimov, \{N. V.\} and V. Anosov and W. Augustyniak and A. Austregesilo and Azevedo, \{C. D.R.\} and B. Bade{\l}ek and F. Balestra and J. Barth and R. Beck and Y. Bedfer and J. Bernhard and K. Bicker and Bielert, \{E. R.\} and R. Birsa and J. Bisplinghoff and M. Bodlak and M. Boer and P. Bordalo and F. Bradamante and C. Braun and A. Bressan and M. B{\"u}chele and Chang, \{W. C.\} and C. Chatterjee and M. Chiosso and I. Choi and Chung, \{S. U.\} and A. Cicuttin and Crespo, \{M. L.\} and Q. Curiel and \{Dalla Torre\}, S. and Dasgupta, \{S. S.\} and S. Dasgupta and Denisov, \{O. Yu\} and L. Dhara and Donskov, \{S. V.\} and N. Doshita and V. Duic and W. D{\"u}nnweber and M. Dziewiecki and A. Efremov and Eversheim, \{P. D.\} and W. Eyrich",

note = "Publisher Copyright: {\textcopyright} 2016",

year = "2017",

month = feb,

day = "1",

doi = "10.1016/j.nuclphysb.2016.12.015",

language = "English",

volume = "915",

pages = "454--475",

journal = "Nuclear Physics B",

issn = "0550-3213",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - Exclusive ω meson muoproduction on transversely polarised protons

AU - The COMPASS Collaboration

AU - Adolph, C.

AU - Aghasyan, M.

AU - Akhunzyanov, R.

AU - Alexeev, M. G.

AU - Alexeev, G. D.

AU - Amoroso, A.

AU - Andrieux, V.

AU - Anfimov, N. V.

AU - Anosov, V.

AU - Augustyniak, W.

AU - Austregesilo, A.

AU - Azevedo, C. D.R.

AU - Badełek, B.

AU - Balestra, F.

AU - Barth, J.

AU - Beck, R.

AU - Bedfer, Y.

AU - Bernhard, J.

AU - Bicker, K.

AU - Bielert, E. R.

AU - Birsa, R.

AU - Bisplinghoff, J.

AU - Bodlak, M.

AU - Boer, M.

AU - Bordalo, P.

AU - Bradamante, F.

AU - Braun, C.

AU - Bressan, A.

AU - Büchele, M.

AU - Chang, W. C.

AU - Chatterjee, C.

AU - Chiosso, M.

AU - Choi, I.

AU - Chung, S. U.

AU - Cicuttin, A.

AU - Crespo, M. L.

AU - Curiel, Q.

AU - Dalla Torre, S.

AU - Dasgupta, S. S.

AU - Dasgupta, S.

AU - Denisov, O. Yu

AU - Dhara, L.

AU - Donskov, S. V.

AU - Doshita, N.

AU - Duic, V.

AU - Dünnweber, W.

AU - Dziewiecki, M.

AU - Efremov, A.

AU - Eversheim, P. D.

AU - Eyrich, W.

PY - 2017/2/1

Y1 - 2017/2/1

N2 - Exclusive production of ω mesons was studied at the COMPASS experiment by scattering 160 GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality 1 (GeV/c)22<10 (GeV/c)2, Bjorken scaling variable 0.003Bj<0.3 and transverse momentum squared of the ω meson 0.05 (GeV/c)2T 2<0.5 (GeV/c)2. The measured asymmetries are sensitive to the nucleon helicity-flip Generalised Parton Distributions (GPD) E that are related to the orbital angular momentum of quarks, the chiral-odd GPDs HT that are related to the transversity Parton Distribution Functions, and the sign of the πω transition form factor. The results are compared to recent calculations of a GPD-based model.

AB - Exclusive production of ω mesons was studied at the COMPASS experiment by scattering 160 GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality 1 (GeV/c)22<10 (GeV/c)2, Bjorken scaling variable 0.003Bj<0.3 and transverse momentum squared of the ω meson 0.05 (GeV/c)2T 2<0.5 (GeV/c)2. The measured asymmetries are sensitive to the nucleon helicity-flip Generalised Parton Distributions (GPD) E that are related to the orbital angular momentum of quarks, the chiral-odd GPDs HT that are related to the transversity Parton Distribution Functions, and the sign of the πω transition form factor. The results are compared to recent calculations of a GPD-based model.

UR - https://www.scopus.com/pages/publications/85008472944

U2 - 10.1016/j.nuclphysb.2016.12.015

DO - 10.1016/j.nuclphysb.2016.12.015

M3 - Article

SN - 0550-3213

VL - 915

SP - 454

EP - 475

JO - Nuclear Physics B

JF - Nuclear Physics B

ER -

Exclusive ω meson muoproduction on transversely polarised protons

Abstract

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