Beam-helicity and beam-charge asymmetries associated with deeply virtual   Compton scattering on the unpolarised proton

The HERMES Collaboration: A. Airapetian; N. Akopov; Z. Akopov; E. C.; Aschenauer; W. Augustyniak; R. Avakian; A. Avetissian; E. Avetisyan; H. P.; Blok; A. Borissov; J. Bowles; V. Bryzgalov; J. Burns; M. Capiluppi; G. P.; Capitani; E. Cisbani; G. Ciullo; M. Contalbrigo; P. F. Dalpiaz; W. Deconinck,; R. De Leo; L. De Nardo; E. De Sanctis; M. Diefenthaler; P. Di Nezza; M.; D\"uren; M. Ehrenfried; G. Elbakian; F. Ellinghaus; A. Fantoni; L. Felawka,; S. Frullani; D. Gabbert; G. Gapienko; V. Gapienko; F. Garibaldi; G. Gavrilov,; F. Giordano; S. Gliske; M. Golembiovskaya; C. Hadjidakis; M. Hartig; D.; Hasch; M. Hoek; Y. Holler; Y. Imazu; H. E. Jackson; H. S. Jo; R. Kaiser; G.; Karyan; T. Keri; E. Kinney; A. Kisselev; N. Kobayashi; V. Korotkov; V.; Kozlov; P. Kravchenko; V. G. Krivokhijine; L. Lagamba; L. Lapik\'as; I.; Lehmann; P. Lenisa; W. Lorenzon; B.-Q. Ma; D. Mahon; N. C. R. Makins; S. I.; Manaenkov; L. Manfr\'e; Y. Mao; B. Marianski; A. Martinez de la Ossa; H.; Marukyan; C. A. Miller; Y. Miyachi; A. Movsisyan; V. Muccifora; M. Murray; A.; Mussgiller; E. Nappi; Y. Naryshkin; A. Nass; W.-D. Nowak; L. L. Pappalardo,; R. Perez-Benito; A. Petrosyan; M. Raithel; P. E. Reimer; A. R. Reolon; C.; Riedl; K. Rith; G. Rosner; A. Rostomyan; J. Rubin; D. Ryckbosch; Y.; Salomatin; F. Sanftl; A. Sch\"afer; G. Schnell; K.P. Sch\"uler; B. Seitz,; T.-A. Shibata; V. Shutov; M. Stancari; M. Statera; E. Steffens; J. J. M.; Steijger; J. Stewart; S. Taroian; A. Terkulov; R. Truty; A. Trzcinski; M.; Tytgat; Y. Van Haarlem; C. Van Hulse; D. Veretennikov; V. Vikhrov; I.; Vilardi; S. Wang; S. Yaschenko; Z. Ye; S. Yen; W. Yu; V. Zagrebelnyy; D.; Zeiler; B. Zihlmann; P. Zupranski

arXiv:1203.6287·hep-ex·June 4, 2015

Beam-helicity and beam-charge asymmetries associated with deeply virtual Compton scattering on the unpolarised proton

The HERMES Collaboration: A. Airapetian, N. Akopov, Z. Akopov, E. C., Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetisyan, H. P., Blok, A. Borissov, J. Bowles, V. Bryzgalov, J. Burns, M. Capiluppi, G. P., Capitani, E. Cisbani, G. Ciullo, M. Contalbrigo

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TL;DR

This paper presents highly precise measurements of beam-helicity and beam-charge asymmetries in deeply virtual Compton scattering on unpolarised protons, using HERMES data from 2006-2007, improving upon earlier results.

Contribution

It provides the most precise asymmetry amplitude measurements in the HERMES kinematic region using a missing-mass event selection technique, combining data sets for enhanced accuracy.

Findings

01

Asymmetry amplitudes are more precise than previous measurements.

02

Results are consistent across different data sets.

03

Combined data yields the most accurate asymmetry measurements in this context.

Abstract

Beam-helicity and beam-charge asymmetries in the hard exclusive leptoproduction of real photons from an unpolarised hydrogen target by a 27.6 GeV lepton beam are extracted from the HERMES data set of 2006-2007 using a missing-mass event selection technique. The asymmetry amplitudes extracted from this data set are more precise than those extracted from the earlier data set of 1996-2005 previously analysed in the same manner by HERMES. The results from the two data sets are compatible with each other. Results from these combined data sets are extracted and constitute the most precise asymmetry amplitude measurements made in the HERMES kinematic region using a missing-mass event selection technique.

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