Measurement of the cross section for hard exclusive π0 muoproduction on the proton

M.G. Alexeev , K Kurek , Robert Kurjata , Janusz Marzec , W.-D. Nowak , F Pereira , Andrzej Rychter , J. Smolik , M. Stolarski , Krzysztof Zaremba , Marcin Ziembicki


We report on a measurement of hard exclusive π0 muoproduction on the proton by COMPASS using 160 GeV/c polarised μ+ and μ beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured μ+ and μ cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range 0.08(GeV/c)2<|t|<0.64(GeV/c)2. The average kinematics of the measurement are 〈Q2〉=2.0(GeV/c)2, 〈ν〉=12.8GeV, 〈xBj〉=0.093 and 〈−t〉=0.256(GeV/c)2. Fitting the azimuthal dependence reveals a combined contribution by transversely and longitudinally polarised photons of (8.2±0.9stat−1.2+1.2|sys)nb/(GeV/c)2, as well as transverse-transverse and longitudinal-transverse interference contributions of (−6.1±1.3stat−0.7+0.7|sys)nb/(GeV/c)2 and (1.5±0.5stat−0.2+0.3|sys)nb/(GeV/c)2, respectively. Our results provide important input for modelling Generalised Parton Distributions. In the context of the phenomenological Goloskokov-Kroll model, the statistically significant transverse-transverse interference contribution constitutes clear experimental evidence for the chiral-odd GPD E‾T.

Collective authorG.D Alexeev, A Amoroso, V Andrieux, N Anfimov, V Anosov, A. Antoshkin, K. Augsten, W. Augu.....
Author M.G. Alexeev
M.G. Alexeev,,
, K Kurek
K Kurek,,
, Robert Kurjata (FEIT / IRMT)
Robert Kurjata,,
- The Institute of Radioelectronics and Multimedia Technology
, Janusz Marzec (FEIT / IRMT)
Janusz Marzec,,
- The Institute of Radioelectronics and Multimedia Technology
, W.-D. Nowak - [Johannes Gutenberg Universitat Mainz]
W.-D. Nowak,,
, F Pereira
F Pereira,,
, Andrzej Rychter (FEIT / IRMT)
Andrzej Rychter,,
- The Institute of Radioelectronics and Multimedia Technology
, J. Smolik
J. Smolik,,
, M. Stolarski - [LIP - Lisboa]
M. Stolarski,,
, Krzysztof Zaremba (FEIT / IRMT)
Krzysztof Zaremba,,
- The Institute of Radioelectronics and Multimedia Technology
et al.`
Total number of authors187
Journal seriesPhysics Letters B, [Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics], ISSN 0370-2693, e-ISSN 1873-2445
Issue year2020
Publication size in sheets0.5
Article number135454
ASJC Classification3106 Nuclear and High Energy Physics
Languageen angielski
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 09-07-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.548; WoS Impact Factor: 2018 = 4.162 (2) - 2018=3.627 (5)
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