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arXiv · 1401.6284

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

C. Adolph·R. Akhunzyanov·M. G. Alekseev·Yu. Alexandrov·G. D. Alexeev·A. Amoroso·V. Andrieux·V. Anosov·A. Austregesilo·B. Badelek·F. Balestra·J. Barth·G. Baum·R. Beck·Y. Bedfer·A. Berlin·J. Bernhard·R. Bertini·K. Bicker·J. Bieling·R. Birsa·J. Bisplinghoff·M. Bodlak·M. Boer·P. Bordalo·F. Bradamante·C. Braun·A. Bravar·A. Bressan·M. Buechele·E. Burtin·L. Capozza·M. Chiosso·S. U. Chung·A. Cicuttin·M. L. Crespo·Q. Curiel·S. Dalla Torre·S. S. Dasgupta·S. Dasgupta·O. Yu. Denisov·S. V. Donskov·N. Doshita·V. Duic·W. Duennweber·M. Dziewiecki·A. Efremov·C. Elia·P. D. Eversheim·W. Eyrich·M. Faessler·A. Ferrero·A. Filin·M. Finger·M. Finger jr.·H. Fischer·C. Franco·N. du Fresne von Hohenesche·J. M. Friedrich·V. Frolov·R. Garfagnini·F. Gautheron·O. P. Gavrichtchouk·S. Gerassimov·R. Geyer·M. Giorgi·I. Gnesi·B. Gobbo·S. Goertz·M. Gorzellik·S. Grabmueller·A. Grasso·B. Grube·A. Guskov·T. Guthoerl·F. Haas·D. von Harrach·D. Hahne·R. Hashimoto·F. H. Heinsius·F. Herrmann·F. Hinterberger·Ch. Hoeppner·N. Horikawa·N. d'Hose·S. Huber·S. Ishimoto·A. Ivanov·Yu. Ivanshin·T. Iwata·R. Jahn·V. Jary·P. Jasinski·P. Joerg·R. Joosten·E. Kabuss·D. Kang·B. Ketzer·G. V. Khaustov·Yu. A. Khokhlov
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Abstract

Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced in deep inelastic scattering were measured using the CERN SPS muon beam at $160$ GeV/c and a $^6$LiD target. The amplitudes of the three azimuthal modulations $\cos\phi_h$, $\cos2\phi_h$ and $\sin\phi_h$ were obtained binning the data separately in each of the relevant kinematic variables $x$, $z$ or $p_T^{\,h}$ and binning in a three-dimensional grid of these three variables. The amplitudes of the $\cos \phi_h$ and $\cos 2\phi_h$ modulations show strong kinematic dependencies both for positive and negative hadrons.

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C. Adolph, R. Akhunzyanov, M. G. Alekseev, Yu. Alexandrov, G. D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badelek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, R. Bertini, K. Bicker, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bravar, A. Bressan, M. Buechele, E. Burtin, L. Capozza, M. Chiosso, S. U. Chung, A. Cicuttin, M. L. Crespo, Q. Curiel, S. Dalla Torre, S. S. Dasgupta, S. Dasgupta, O. Yu. Denisov, S. V. Donskov, N. Doshita, V. Duic, W. Duennweber, M. Dziewiecki, A. Efremov, C. Elia, P. D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J. M. Friedrich, V. Frolov, R. Garfagnini, F. Gautheron, O. P. Gavrichtchouk, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmueller, A. Grasso, B. Grube, A. Guskov, T. Guthoerl, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F. H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Hoeppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Joerg, R. Joosten, E. Kabuss, D. Kang, B. Ketzer, G. V. Khaustov, Yu. A. Khokhlov. 2014-01-24. Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons. https://doi.org/10.1016/j.nuclphysb.2014.07.019

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