Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons

C Adolph,R Akhunzyanov, M Alexeev,Yu A Alexandrov,G D Alexeev,A Amoroso,V Andrieux,V Anosov,A Austregesilo,B Badelek,F Balestra,J Barth,G Baum, R Beck,Y Bedfer,Andrew A Berlin,J C Bernhard,R Bertini, K Bicker, J Bieling,R Birsa,J Bisplinghoff, Martin Bodlak,Matthias M Boer,P Bordalo,F Bradamante,Claude M J Braun,A Bravar,A Bressan, M Buchele,E Burtin,L Capozza,M Chiosso,S U Chung,A Cicuttin,M L Crespo, Q Curiel,S Dalla Torre,S S Dasgupta,O Yu Denisov,S V Donskov,N Doshita,V Duic,W Dunnweber,M Dziewiecki,Anatoli Vasilievich Efremov,C Elia,P D Eversheim,W Eyrich, M A Faessler,A Ferrero, A P Filin,M Finger,H M Fischer,Carlo D Franco,N Du Fresne Von Hohenesche,J M Friedrich,V V Frolov,R Garfagnini,F Gautheron,O P Gavrichtchouk,S G Gerassimov,R Geyer,M A Giorgi,I Gnesi,B Gobbo,S Goertz, M Gorzellik,S Grabmuller,A Grasso,B Grube,A Guskov, T Guthorl,F Haas,D Von Harrach, D Hahne,R Hashimoto,F H Heinsius,Florian Herrmann,F Hinterberger, Ch Hoppner,N Horikawa,N Dhose,Sebastian D Huber,S Ishimoto,Andrew Ivanov,Yu I Ivanshin,T Iwata,R Jahn,V Jary,P Jasinski,P Joerg,R Joosten, E Kabus,Daehyun Kang,B Ketzer,G V Khaustov,Yu A Khokhlov,Yu Kisselev, F J Klein,K Klimaszewski,J H Koivuniemi,V N Kolosov,K Kondo, K Konigsmann,I Konorov,V F Konstantinov,A M Kotzinian,O Kouznetsov,Z Kral,M G Kramer,Z V Kroumchtein,N Kuchinski,F Kunne,K Kurek,R Kurjata,A A Lednev,A Lehmann,S Levorato,J Lichtenstadt,A Maggiora,A Magnon,N Makke,G K Mallot,C Marchand,A Martin,J Marzec,J Matousek,Hideo Matsuda,T Matsuda,G Meshcheryakov, W T Meyer,T Michigami,Yu V Mikhailov,Y Miyachi,A Nagaytsev,T Nagel,F Nerling,S Neubert,D Neyret, V Nikolaenko,J Novy,W D Nowak,A S Nunes,I Orlov,A G Olshevsky,M Ostrick,R Panknin,D Panzieri,B Parsamyan,S K Paul,M Pesek,D V Peshekhonov,G Piragino,S Platchkov, J Pochodzalla,Julia M Polak,V A Polyakov,J Pretz,M Quaresma,C Quintans,S Ramos,G Reicherz,E Rocco, V K Rodionov,E Rondio,Anna M Rychter,N S Rossiyskaya,D I Ryabchikov,V D Samoylenko,A Sandacz,S Sarkar,I Savin,G Sbrizzai,P Schiavon,C Schill,T Schluter,A Schmidt,K H Schmidt,H Schmieden,Karin Schonning,S Schopferer,M Schott,O Yu Shevchenko,Laura Gonzalez Silva,L Sinha, S Sirtl,M Slunecka,S Sosio,F Sozzi,A Srnka,L Steiger,M Stolarski,M Sulc,R Sulej,Hitoshi Suzuki, A Szableski,T Szameitat,P Sznajder,S Takekawa,J Ter Wolbeek,S Tessaro,F Tessarotto, F Thibaud,S Uhl,I Uman,M Vandenbroucke,M Virius, J Vondra, Lisheng Wang, T Weisrock, M Wilfert,R Windmolders,W Wiślicki,H Wollny,K Zaremba,M Zavertyaev,E Zemlyanichkina,M Ziembicki

Nuclear Physics B（2014）

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摘要

Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced in deep inelastic scattering were measured using the CERN SPS longitudinally polarised muon beam at 160GeV/c and a 6LiD target. The amplitudes of the three azimuthal modulations cos⁡ϕh, cos⁡2ϕh and sin⁡ϕh were obtained binning the data separately in each of the relevant kinematic variables x, z or pTh and binning in a three-dimensional grid of these three variables. The amplitudes of the cos⁡ϕh and cos⁡2ϕh modulations show strong kinematic dependencies both for positive and negative hadrons.

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nucleon,kinematics,modulation

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