Measurement of the cross section for hard exclusive pi0 muoproduction on the proton / M. Alekseev, G. Alekseev, A. Amoroso [et al.]
Уровень набора: Physics Letters BЯзык: английский.Резюме или реферат: We report on a measurement of hard exclusive π0 muoproduction on the proton by COMPASS using 160 GeV/c polarised [mu]+ and [mu]- beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured [mu]+ and [mu]- cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range 0.08(GeV/c)2<t<0.64(GeV/c)2.; Fitting the azimuthal dependence reveals a combined contribution by transversely and longitudinally polarised photons of (8.2±0.9stat-1.2+1.2 sys)nb/(GeV/c)2, as well as transverse-transverse and longitudinal-transverse interference contributions of (-6.1±1.3stat-0.7+0.7 sys)nb/(GeV/c)2 and (1.5±0.5stat-0.2+0.3 sys)nb/(GeV/c)2, respectively. Our results provide important input for modelling Generalised Parton Distributions. In the context of the phenomenological Goloskokov-Kroll model, the statistically significant transverse-transverse interference contribution constitutes clear experimental evidence for the chiral-odd GPD E T..Примечания о наличии в документе библиографии/указателя: [References.: 31 tit.].Тематика: электронный ресурс | труды учёных ТПУ | quantum chromodynamics | muoproduction | hard exclusive meson production | generalised parton distributions | COMPASS | квантовая хромодинамика | мезоны | протоны Ресурсы он-лайн:Щелкните здесь для доступа в онлайнTitle screen
[References.: 31 tit.]
We report on a measurement of hard exclusive π0 muoproduction on the proton by COMPASS using 160 GeV/c polarised [mu]+ and [mu]- beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured [mu]+ and [mu]- cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range 0.08(GeV/c)2<t<0.64(GeV/c)2.
Fitting the azimuthal dependence reveals a combined contribution by transversely and longitudinally polarised photons of (8.2±0.9stat-1.2+1.2 sys)nb/(GeV/c)2, as well as transverse-transverse and longitudinal-transverse interference contributions of (-6.1±1.3stat-0.7+0.7 sys)nb/(GeV/c)2 and (1.5±0.5stat-0.2+0.3 sys)nb/(GeV/c)2, respectively. Our results provide important input for modelling Generalised Parton Distributions. In the context of the phenomenological Goloskokov-Kroll model, the statistically significant transverse-transverse interference contribution constitutes clear experimental evidence for the chiral-odd GPD E T.
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