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Beam-helicity asymmetry arising from deeply virtual Compton scattering measured with kinematically complete event reconstruction

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arxiv 1206.5683 v2 pith:S4HJA34S submitted 2012-06-25 hep-ex

Beam-helicity asymmetry arising from deeply virtual Compton scattering measured with kinematically complete event reconstruction

The HERMES Collaboration: A. Airapetian , N. Akopov , Z. Akopov , E. C. Aschenauer , W. Augustyniak , R. Avakian , A. Avetissian , E. Avetisyan
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S. Belostotski H. P. Blok A. Borissov J. Bowles I. Brodski 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 E. Etzelm\"uller R. Fabbri A. Fantoni L. Felawka S. Frullani G. Gapienko V. Gapienko F. Garibaldi G. Gavrilov V. Gharibyan F. Giordano S. Gliske M. Golembiovskaya I. M. Gregor H. Guler M. Hartig D. Hasch A. Hillenbrand M. Hoek Y. Holler I. Hristova A. Ivanilov H. E. Jackson H. S. Jo S. Joosten R. Kaiser G. Karyan T. Keri E. Kinney A. Kisselev V. Korotkov V. Kozlov B. Krauss P. Kravchenko V. G. Krivokhijine L. Lagamba L. Lapik\'as I. Lehmann P. Lenisa A. L\'opez Ruiz W. Lorenzon S. Lu X. Lu 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 M. Murray A. Mussgiller E. Nappi Y. Naryshkin A. Nass M. Negodaev W.-D. Nowak A. Osborne L. L. Pappalardo R. Perez-Benito A. Petrosyan P. E. Reimer A. R. Reolon C. Riedl K. Rith G. Rosner A. Rostomyan L. Rubacek J. Rubin D. Ryckbosch A. Sch\"afer G. Schnell K. P. Sch\"uler B. Seitz C. Shearer T.-A. Shibata V. Shutov M. Stancari M. Statera 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 V. Zagrebelnyy D. Zeiler B. Zihlmann P. Zupranski
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classification hep-ex
keywords asymmetrybeam-helicityscatteringbackgroundcomptondatadeeplyevents
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The beam-helicity asymmetry in exclusive electroproduction of real photons by the longitudinally polarized HERA positron beam scattering off an unpolarized hydrogen target is measured at HERMES. The asymmetry arises from deeply virtual Compton scattering and its interference with the Bethe--Heitler process. Azimuthal amplitudes of the beam-helicity asymmetry are extracted from a data sample consisting of $ep\rightarrow ep\gamma$ events with detection of all particles in the final state including the recoiling proton. The installation of a recoil detector, while reducing the acceptance of the experiment, allows the elimination of background from $ep\rightarrow eN\pi\gamma$ events, which was estimated to contribute an average of about 12% to the signal in previous HERMES publications. The removal of this background from the present data sample is shown to increase the magnitude of the leading asymmetry amplitude by 0.054 +/- 0.016 to -0.328 +/- 0.027 (stat.) +/- 0.045 (syst.).

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