Abstract
The K− over K+ multiplicity ratio is measured in deep-inelastic scattering, for the first time for kaons carrying a large fraction z of the virtual-photon energy. The data were obtained by the COMPASS collaboration using a 160 GeV muon beam and 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>5GeV/c2 for the invariant mass of the produced hadronic system. Kaons are identified in the momentum range from 12 GeV/c to 40 GeV/c, thereby restricting the range in Bjorken-x to 0.01<x<0.40. The z-dependence of the multiplicity ratio is studied for z>0.75. For very large values of z, i.e. z>0.8, we observe the kaon multiplicity ratio to fall below the lower limits expected from calculations based on leading and next-to-leading order perturbative quantum chromodynamics. Also, the kaon multiplicity ratio shows a strong dependence on the missing mass of the single-kaon production process. This suggests that within the perturbative quantum chromodynamics formalism an additional correction may be required, which takes into account the phase space available for hadronisation.
| Original language | English |
|---|---|
| Pages (from-to) | 390-398 |
| Number of pages | 9 |
| Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
| Volume | 786 |
| DOIs | |
| Publication status | Published - 10 Nov 2018 |
Fingerprint
ASJC Scopus subject areas
- Nuclear and High Energy Physics
Cite this
K− over K+ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy. / The COMPASS Collaboration ; Mamon, Sergey Alexandrovich.
In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 786, 10.11.2018, p. 390-398.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - K− over K+ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy
AU - The COMPASS Collaboration
AU - Akhunzyanov, R.
AU - Alexeev, M. G.
AU - Alexeev, G. D.
AU - Amoroso, A.
AU - Andrieux, V.
AU - Anfimov, N. V.
AU - Anosov, V.
AU - Antoshkin, A.
AU - Augsten, K.
AU - Augustyniak, W.
AU - Austregesilo, A.
AU - Azevedo, C. D.R.
AU - Badełek, B.
AU - Balestra, F.
AU - Ball, M.
AU - Barth, J.
AU - Beck, R.
AU - Bedfer, Y.
AU - Bernhard, J.
AU - Bicker, K.
AU - Bielert, E. R.
AU - Birsa, R.
AU - Bodlak, M.
AU - Bordalo, P.
AU - Bradamante, F.
AU - Bressan, A.
AU - Büchele, M.
AU - Burtsev, V. E.
AU - Capozza, L.
AU - Chang, W. C.
AU - Chatterjee, C.
AU - Chiosso, M.
AU - Chumakov, A. G.
AU - Chung, S. U.
AU - Cicuttin, A.
AU - Crespo, M. L.
AU - Curiel, Q.
AU - Dalla Torre, S.
AU - Dasgupta, S. S.
AU - Dasgupta, S.
AU - Denisov, O. Yu
AU - Dhara, L.
AU - Donskov, S. V.
AU - Doshita, N.
AU - Dreisbach, Ch
AU - Dünnweber, W.
AU - Dusaev, R. R.
AU - Levchenko, E. A.
AU - Lyubovitskij, V. E.
AU - Vasilishin, B. I.
AU - Mamon, Sergey Alexandrovich
PY - 2018/11/10
Y1 - 2018/11/10
N2 - The K− over K+ multiplicity ratio is measured in deep-inelastic scattering, for the first time for kaons carrying a large fraction z of the virtual-photon energy. The data were obtained by the COMPASS collaboration using a 160 GeV muon beam and 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>5GeV/c2 for the invariant mass of the produced hadronic system. Kaons are identified in the momentum range from 12 GeV/c to 40 GeV/c, thereby restricting the range in Bjorken-x to 0.010.75. For very large values of z, i.e. z>0.8, we observe the kaon multiplicity ratio to fall below the lower limits expected from calculations based on leading and next-to-leading order perturbative quantum chromodynamics. Also, the kaon multiplicity ratio shows a strong dependence on the missing mass of the single-kaon production process. This suggests that within the perturbative quantum chromodynamics formalism an additional correction may be required, which takes into account the phase space available for hadronisation.
AB - The K− over K+ multiplicity ratio is measured in deep-inelastic scattering, for the first time for kaons carrying a large fraction z of the virtual-photon energy. The data were obtained by the COMPASS collaboration using a 160 GeV muon beam and 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>5GeV/c2 for the invariant mass of the produced hadronic system. Kaons are identified in the momentum range from 12 GeV/c to 40 GeV/c, thereby restricting the range in Bjorken-x to 0.010.75. For very large values of z, i.e. z>0.8, we observe the kaon multiplicity ratio to fall below the lower limits expected from calculations based on leading and next-to-leading order perturbative quantum chromodynamics. Also, the kaon multiplicity ratio shows a strong dependence on the missing mass of the single-kaon production process. This suggests that within the perturbative quantum chromodynamics formalism an additional correction may be required, which takes into account the phase space available for hadronisation.
UR - http://www.scopus.com/inward/record.url?scp=85055660110&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85055660110&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2018.09.052
DO - 10.1016/j.physletb.2018.09.052
M3 - Article
AN - SCOPUS:85055660110
VL - 786
SP - 390
EP - 398
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
ER -