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Measurement of subjet multiplicities in neutral current deep inelastic scattering at HERA and determination of alpha(s)
- Source :
- Physics Letters B, 558 (1-2), Physics Letters B, 558, 41-58. Elsevier
- Publication Year :
- 2003
- Publisher :
- Elsevier Science Bv, 2003.
-
Abstract
- The subjet multiplicity has been measured in neutral current e+p interactions at Q**2 > 125 GeV**2 with the ZEUS detector at HERA using an integrated luminosity of 38.6 pb-1. Jets were identified in the laboratory frame using the longitudinally invariant K_T cluster algorithm. The number of jet-like substructures within jets, known as the subjet multiplicity, is defined as the number of clusters resolved in a jet by reapplying the jet algorithm at a smaller resolution scale y_cut. Measurements of the mean subjet multiplicity, < n_sbj >, for jets with transverse energies E_T,jet >15 GeV are presented. Next-to-leading-order perturbative QCD calculations describe the measurements well. The value of alpha_s(M_Z), determined from < n_sbj > at y_cut=10**-2 for jets with 25 < E_T,jet < 71 GeV, is alpha_s (M_Z) = 0.1187 +/- 0.0017 (stat.) +0.0024 / -0.0009 (syst.) +0.0093 / -0.0076 (th.).<br />Comment: 27 pages, 4 figures, 3 tables; submitted to Phys. Lett
- Subjects :
- Nuclear and High Energy Physics
Particle physics
MONTE-CARLO GENERATOR
Astrophysics::High Energy Astrophysical Phenomena
Elementary particle
Inelastic scattering
COLOR DIPOLE MODEL
01 natural sciences
Particle identification
High Energy Physics - Experiment
Nuclear physics
LEPTON-NUCLEON SCATTERING
0103 physical sciences
JET CROSS-SECTIONS
CENTRAL TRACKING DETECTOR
STRONG-COUPLING CONSTANT
ZEUS BARREL CALORIMETER
GLUON JETS
PARTON DISTRIBUTIONS
BREIT FRAME
Nuclear Experiment
010306 general physics
QC
Physics
Quantum chromodynamics
Research Groups and Centres\Physics\Low Temperature Physics
010308 nuclear & particles physics
Faculty of Science\Physics
Perturbative QCD
Multiplicity (mathematics)
ZEUS
HERA
Deep inelastic scattering
High Energy Physics::Experiment
Subjects
Details
- Language :
- English
- ISSN :
- 03702693
- Database :
- OpenAIRE
- Journal :
- Physics Letters B, 558 (1-2), Physics Letters B, 558, 41-58. Elsevier
- Accession number :
- edsair.doi.dedup.....296c7cf0076c8a2d1efdecec9c3dab8f