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Электронный каталог: Alexeev, G. D. - Measurement of the Hard Exclusive *p*0 Muoproduction Cross Section at COMPASS
Alexeev, G. D. - Measurement of the Hard Exclusive *p*0 Muoproduction Cross Section at COMPASS
Статья
Автор: Alexeev, G. D.
Physics Letters B: Measurement of the Hard Exclusive *p*0 Muoproduction Cross Section at COMPASS
б.г.
ISBN отсутствует
Автор: Alexeev, G. D.
Physics Letters B: Measurement of the Hard Exclusive *p*0 Muoproduction Cross Section at COMPASS
б.г.
ISBN отсутствует
На полку
Статья
Alexeev, G.D.
Measurement of the Hard Exclusive *p*0 Muoproduction Cross Section at COMPASS / G.D.Alexeev, V.Anosov, V.Frolov, O.P.Gavrichtchouk, A.Gridin, A.Guskov, O.M.Kouznetsov, E.Mitrofanov, A.Nagaytsev, A.G.Olshevsky, D.V.Peshekhonov, I.A.Savin, A.Selyunin, E.Zemlyanichkina, [COMPASS Collab.]. – Text : electronic // Physics Letters B. – 2025. – Vol. 870. – P. 139832. – URL: https://doi.org/10.1016/j.physletb.2025.139832. – Bibliogr.: 40.
A new and detailed measurement of the cross section for hard exclusive neutral-pion muoproduction on the proton was performed in a wide kinematic region, with the photon virtuality 𝑄&sup(2) ranging from 1 to 8 (GeV/𝑐) 2and the Bjorken variable 𝑥&sub(Bj) ranging from 0.02 to 0.45. The data were collected at COMPASS at CERN using 160 GeV/𝑐 longitudinally polarised µ+ and µ− beams scattering off a 2.5 m long liquid hydrogen target. From the average of the measured *m&sup(+) and *m&sup(−) 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)&sup(2) < |𝑡| < 0.64 (GeV/𝑐)&sup(2) . From its angular distribution, the combined contribution of transversely and longitudinally polarised 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 𝑄&sup(2) and virtual-photon energy *n. 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 polarised photons. This could provide clear experimental evidence for the chiral-odd GPD 𝐸^-&sub(𝑇) . In addition, the existence of a non-negligible contribution of longitudinally polarised photons is suggested by the |𝑡|-dependence of the cross section at 𝑥&sub(Bj) < 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.
Спец.(статьи,препринты) = С 346.4в - Взаимодействие пи-мезонов с барионами
ОИЯИ = ОИЯИ (JINR)2025
Alexeev, G.D.
Measurement of the Hard Exclusive *p*0 Muoproduction Cross Section at COMPASS / G.D.Alexeev, V.Anosov, V.Frolov, O.P.Gavrichtchouk, A.Gridin, A.Guskov, O.M.Kouznetsov, E.Mitrofanov, A.Nagaytsev, A.G.Olshevsky, D.V.Peshekhonov, I.A.Savin, A.Selyunin, E.Zemlyanichkina, [COMPASS Collab.]. – Text : electronic // Physics Letters B. – 2025. – Vol. 870. – P. 139832. – URL: https://doi.org/10.1016/j.physletb.2025.139832. – Bibliogr.: 40.
A new and detailed measurement of the cross section for hard exclusive neutral-pion muoproduction on the proton was performed in a wide kinematic region, with the photon virtuality 𝑄&sup(2) ranging from 1 to 8 (GeV/𝑐) 2and the Bjorken variable 𝑥&sub(Bj) ranging from 0.02 to 0.45. The data were collected at COMPASS at CERN using 160 GeV/𝑐 longitudinally polarised µ+ and µ− beams scattering off a 2.5 m long liquid hydrogen target. From the average of the measured *m&sup(+) and *m&sup(−) 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)&sup(2) < |𝑡| < 0.64 (GeV/𝑐)&sup(2) . From its angular distribution, the combined contribution of transversely and longitudinally polarised 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 𝑄&sup(2) and virtual-photon energy *n. 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 polarised photons. This could provide clear experimental evidence for the chiral-odd GPD 𝐸^-&sub(𝑇) . In addition, the existence of a non-negligible contribution of longitudinally polarised photons is suggested by the |𝑡|-dependence of the cross section at 𝑥&sub(Bj) < 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.
Спец.(статьи,препринты) = С 346.4в - Взаимодействие пи-мезонов с барионами
ОИЯИ = ОИЯИ (JINR)2025
