https://doi.org/10.1140/epjc/s10052-018-6379-7
Letter
Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons
1
University of Eastern Piedmont, 15100, Alessandria, Italy
2
Department of Physics, University of Aveiro, 3810-193, Aveiro, Portugal
3
Institut für Experimentalphysik, Universität Bochum, 44780, Bochum, Germany
4
Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115, Bonn, Germany
5
Physikalisches Institut, Universität Bonn, 53115, Bonn, Germany
6
Institute of Scientific Instruments, AS CR, 61264, Brno, Czech Republic
7
Matrivani Institute of Experimental Research and Education, Calcutta, 700 030, India
8
Joint Institute for Nuclear Research, 141980, Dubna, Moscow region, Russia
9
Physikalisches Institut, Universität Erlangen–Nürnberg, 91054, Erlangen, Germany
10
Physikalisches Institut, Universität Freiburg, 79104, Freiburg, Germany
11
CERN, 1211, Geneva 23, Switzerland
12
Technical University in Liberec, 46117, Liberec, Czech Republic
13
LIP, 1000-149, Lisbon, Portugal
14
Institut für Kernphysik, Universität Mainz, 55099, Mainz, Germany
15
University of Miyazaki, Miyazaki, 889-2192, Japan
16
Lebedev Physical Institute, 119991, Moscow, Russia
17
Physik Department, Technische Universität München, 85748, Garching, Germany
18
Nagoya University, 464, Nagoya, Japan
19
Faculty of Mathematics and Physics, Charles University in Prague, 18000, Prague, Czech Republic
20
Czech Technical University in Prague, 16636, Prague, Czech Republic
21
State Scientific Center Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’, 142281, Protvino, Russia
22
IRFU, CEA, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
23
Institute of Physics, Academia Sinica, Taipei, 11529, Taiwan
24
School of Physics and Astronomy, Tel Aviv University, 69978, Tel Aviv, Israel
25
Department of Physics, University of Trieste, 34127, Trieste, Italy
26
Trieste Section of INFN, 34127, Trieste, Italy
27
Abdus Salam ICTP, 34151, Trieste, Italy
28
Department of Physics, University of Turin, 10125, Turin, Italy
29
Torino Section of INFN, 10125, Turin, Italy
30
Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL, 61801-3080, USA
31
National Centre for Nuclear Research, 00-681, Warsaw, Poland
32
Faculty of Physics, University of Warsaw, 02-093, Warsaw, Poland
33
Institute of Radioelectronics, Warsaw University of Technology, 00-665, Warsaw, Poland
34
Yamagata University, Yamagata, 992-8510, Japan
* e-mail: Gerhard.Mallot@cern.ch
Received:
9
November
2016
Accepted:
29
October
2018
Published online:
19
November
2018
Single hadron azimuthal asymmetries of positive and negative hadrons produced in muon semi-inclusive deep inelastic scattering off longitudinally polarised deuterons are determined using the 2006 COMPASS data and also combined all deuteron COMPASS data. For each hadron charge, the dependence of the azimuthal asymmetry on the hadron azimuthal angle is obtained by means of a five-parameter fitting function that besides a
-independent term includes four modulations predicted by theory:
,
,
and
. The amplitudes of the five terms have been extracted, first, for the hadrons in the whole available kinematic region. In further fits, performed for hadrons from a restricted kinematic region, the
-dependence is determined as a function of one of three variables (Bjorken-x, fractional energy of virtual photon taken by the outgoing hadron and hadron transverse momentum), while disregarding the others. Except the
-independent term, all the modulation amplitudes are very small, and no clear kinematic dependence could be observed within experimental uncertainties.
© The Author(s), 2018