Measurement of the cross section for hard exclusive pi0 muoproduction on the proton; Physics Letters B; Vol. 805
| Parent link: | Physics Letters B Vol. 805.— 2020.— [135454, 8 p.] |
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| Corporate Authors: | , |
| Other Authors: | , , , , , , |
| Summary: | Title screen 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. |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://doi.org/10.1016/j.physletb.2020.135454 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=665751 |