6533b824fe1ef96bd12816e0

RESEARCH PRODUCT

Energy evolution of the moments of the hadron distribution in QCD jets including NNLL resummation and NLO running-coupling corrections

Redamy Pérez-ramosDavid D'enterria

subject

Nuclear and High Energy PhysicsParticle physicsNuclear TheoryGaussianHadronFOS: Physical sciencesHigh Energy Physics - ExperimentNuclear Theory (nucl-th)High Energy Physics - Experiment (hep-ex)symbols.namesakeHigh Energy Physics - Phenomenology (hep-ph)Nuclear Experiment (nucl-ex)Multiplicity (chemistry)ResummationNuclear ExperimentNuclear ExperimentParticle Physics - PhenomenologyQuantum chromodynamicsPhysicsCoupling constantta114High Energy Physics::PhenomenologyHigh Energy Physics - PhenomenologySkewnesssymbolsKurtosisHigh Energy Physics::Experiment

description

The moments of the single inclusive momentum distribution of hadrons in QCD jets, are studied in the next-to-modified-leading-log approximation (NMLLA) including next-to-leading-order (NLO) corrections to the alpha_s strong coupling. The evolution equations are solved using a distorted Gaussian parametrisation, which successfully reproduces the spectrum of charged hadrons of jets measured in e+e- collisions. The energy dependencies of the maximum peak, multiplicity, width, kurtosis and skewness of the jet hadron distribution are computed analytically. Comparisons of all the existing jet data measured in e+e- collisions in the range sqrt(s)~2-200 GeV to the NMLLA+NLO* predictions allow one to extract a value of the QCD parameter Lambda_QCD, and associated two-loop coupling constant at the Z resonance alpha_s(m_Z^2)= 0.1195 +/- 0.0022, in excellent numerical agreement with the current world average obtained using other methods.

yearjournalcountryeditionlanguage
2013-10-31Journal of High Energy Physics
https://doi.org/10.1007/jhep08(2014)068