Antiproton over proton and K− over K+ multiplicity ratios at high z in DIS
Authors:
- G.D Alexeev,
- K Kurek,
- Robert Kurjata,
- Janusz Marzec,
- W.-D. Nowak,
- Marcin Stolarski,
- Krzysztof Zaremba,
- Marcin Ziembicki
Abstract
The antiparticle-over-particle multiplicity ratio is measured in deep-inelastic scattering for negatively and positively charged kaons and, for the first time, for antiprotons and protons. The data were obtained by the COMPASS Collaboration using a 160 GeV muon beam impinging on an isoscalar 6LiD target. The regime of deep-inelastic scattering is ensured by requiring Q2 > 1 (GeV/c)2 for the photon virtuality and W>5 GeV/c2 for the invariant mass of the produced hadronic system. Bjorken-x is restricted to the range 0.01 to 0.40. Protons and antiprotons are identified in the momentum range from 20 GeV/c to 60 GeV/c and required to carry a large fraction of the virtual-photon energy, z>0.5. In the whole studied z-region, the p¯ over p multiplicity ratio is found to be below the lower limit expected from calculations based on leading-order perturbative Quantum Chromodynamics (pQCD). Kaons were previously analysed in the momentum range 12 GeV/c to 40 GeV/c. In the present analysis this range is extended up to 55 GeV/c, whereby events with larger virtual-photon energies are included in the analysis and the observed K− over K+ ratio becomes closer to the expectation of next-to-leading order pQCD. The results of both analyses strengthen our earlier conclusion that at COMPASS energies the phase space available for single-hadron production in deep-inelastic scattering should be taken into account in the standard pQCD formalism.
- Record ID
- WUT9e734a211b614329ab0446e74479a166
- Author
- Total number of authors
- 198
- Collective author
- M.G. Alexeev, A Amoroso, V Andrieux, V Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, C.....
- Journal series
- Physics Letters B, ISSN 0370-2693, e-ISSN 1873-2445
- Issue year
- 2020
- Vol
- 807
- Pages
- 1-10
- Publication size in sheets
- 6780.00
- Article number
- 135600
- ASJC Classification
- DOI
- DOI:10.1016/j.physletb.2020.135600 Opening in a new tab
- Language
- (en) English
- License
- File
-
- File: 1
- Antiproton over proton and K− over K+ multiplicity ratios at high z in DIS, File WUT9e734a211b614329ab0446e74479a166.pdf / 542 KB
- WUT9e734a211b614329ab0446e74479a166.pdf
- publication date: 10-11-2020
- Antiproton over proton and K− over K+ multiplicity ratios at high z in DIS, File WUT9e734a211b614329ab0446e74479a166.pdf / 542 KB
-
- Score (nominal)
- 140
- Score source
- journalList
- Score
- = 140.0, 13-05-2022, ArticleFromJournal
- Publication indicators
- = 1; = 1; = 3; : 2017 = 1.548; : 2020 (2 years) = 4.771 - 2020 (5 years) =3.779
- Citation count
- 4
- Uniform Resource Identifier
- https://repo.pw.edu.pl/info/article/WUT9e734a211b614329ab0446e74479a166/
- URN
urn:pw-repo:WUT9e734a211b614329ab0446e74479a166
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or PerishOpening in a new tab system.