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

show 126 more authors

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

Authors on Pith no claims yet

classification ✦ hep-ex

keywords asymmetrydatafunctionmeasurementpolarizedprotonspin-structurevirtual-photon

0 comments

read the original abstract

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.

This paper has not been read by Pith yet.

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

discussion (0)