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Measurement of the virtual-photon asymmetry A2 and the spin-structure function g2 of the proton

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arxiv 1112.5584 v3 pith:NO6UKNAZ submitted 2011-12-23 hep-ex

Measurement of the virtual-photon asymmetry A2 and the spin-structure function g2 of the proton

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 N. Bianchi 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 V. Gharibyan F. Giordano S. Gliske M. Golembiovskaya C. Hadjidakis M. Hartig D. Hasch A. Hillenbrand M. Hoek Y. Holler I. Hristova Y. Imazu A. Ivanilov H. E. Jackson H. S. Jo S. Joosten R. Kaiser G. Karyan T. Keri E. Kinney A. Kisselev V. Korotkov V. Kozlov P. Kravchenko V. G. Krivokhijine L. Lagamba L. Lapik\'as I. Lehmann P. Lenisa A. L\'opez Ruiz 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 M. Negodaev W.-D. Nowak L. L. Pappalardo R. Perez-Benito A. Petrosyan 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 F. Stinzing S. Taroian A. Terkulov R. Truty A. Trzcinski M. Tytgat A. Vandenbroucke 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 asymmetrydatafunctionmeasurementpolarizedprotonspin-structurevirtual-photon
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A measurement of the virtual-photon asymmetry A_2(x,Q^2) and of the spin-structure function g_2(x,Q^2) of the proton are presented for the kinematic range 0.004 < x < 0.9 and 0.18 GeV^2 < Q^2 < 20 GeV^2. The data were collected by the HERMES experiment at the HERA storage ring at DESY while studying inclusive deep-inelastic scattering of 27.6 GeV longitudinally polarized leptons off a transversely polarized hydrogen gas target. The results are consistent with previous experimental data from CERN and SLAC. For the x-range covered, the measured integral of g_2(x) converges to the null result of the Burkhardt-Cottingham sum rule. The x^2 moment of the twist-3 contribution to g_2(x) is found to be compatible with zero.

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