TY - JOUR
T1 - Measurement of Subjet Multiplicities in Neutral Current Deep Inelastic Scattering at HERA and Determination of αs
AU - Chekanov, S.
AU - Krakauer, D.
AU - Loizides, J. H.
AU - Magill, S.
AU - Musgrave, B.
AU - Repond, J.
AU - Yoshida, R.
AU - Mattingly, Margarita C. K.
AU - Antonioli, P.
AU - Bari, G.
AU - Basile, M.
AU - Bellagamba, L.
AU - Boscherini, D.
AU - Bruni, A.
AU - Bruni, G.
AU - Cara Romeo, G.
AU - Cifarelli, L.
AU - Cindolo, F.
AU - Contin, A.
AU - Corradi, M.
AU - de Pasquale, S.
AU - Giusti, P.
AU - Iacobucci, G.
AU - Margotti, A.
AU - Nania, R.
AU - Palmonari, F.
AU - Pesci, A.
AU - Sartorelli, G.
AU - Zichichi, A.
AU - Aghuzumtsyan, G.
AU - Bartsch, D.
PY - 2003/4/10
Y1 - 2003/4/10
N2 - The subjet multiplicity has been measured in neutral current e+p interactions at Q2 > 125 GeV2 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 kT 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 ycut. Measurements of the mean subjet multiplicity, (nsbj), for jets with transverse energies ET,jet > 15 GeV are presented. Next-to-leading-order perturbative QCD calculations describe the measurements well. The value of αs(MZ), determined from (nsbj) at ycut = 10-2 for jets with 25 < ET,jet < 71 GeV, is αs(MZ) = 0.1187 ± 0.0017(stat.)-0.0009+0.0024(syst.) -0.0076+0.0093(th.).
AB - The subjet multiplicity has been measured in neutral current e+p interactions at Q2 > 125 GeV2 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 kT 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 ycut. Measurements of the mean subjet multiplicity, (nsbj), for jets with transverse energies ET,jet > 15 GeV are presented. Next-to-leading-order perturbative QCD calculations describe the measurements well. The value of αs(MZ), determined from (nsbj) at ycut = 10-2 for jets with 25 < ET,jet < 71 GeV, is αs(MZ) = 0.1187 ± 0.0017(stat.)-0.0009+0.0024(syst.) -0.0076+0.0093(th.).
UR - https://digitalcommons.andrews.edu/pubs/2209
U2 - 10.1016/S0370-2693(03)00216-8
DO - 10.1016/S0370-2693(03)00216-8
M3 - Article
VL - 558
SP - 41
EP - 58
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-2
ER -