Published September 2017 | Version v1
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Determination of the strong coupling constant αs(mZ) in next-to-next-to-leading order QCD using H1 jet cross section measurements

Creators

  • 1. Lebedev Physical Institute, Moscow (Russian Federation)
  • 2. Yerevan Physics Institute (Argentina)
  • 3. Mongolian Academy of Sciences, Ulaanbaatar (Mongolia). Inst. of Physics and Technology

Description

The strong coupling constant αs is determined from inclusive jet and dijet cross sections in neutral-current deep-inelastic ep scattering (DIS) measured at HERA by the H1 collaboration using next-to-next-to-leading order (NNLO) QCD predictions. The dependence of the NNLO predictions and of the resulting value of αs(mZ) at the Z-boson mass mZ are studied as a function of the choice of the renormalisation and factorisation scales. Using inclusive jet and dijet data together, the strong coupling constant is determined to be αs(mZ)=0.1157(20)exp(29)th. Complementary, αs(mZ) is determined together with parton distribution functions of the proton (PDFs) from jet and inclusive DIS data measured by the H1 experiment. The value αs(mZ)=0.1142(28)tot obtained is consistent with the determination from jet data alone. The impact of the jet data on the PDFs is studied. The running of the strong coupling is tested at different values of the renormalisation scale and the results are found to be in agreement with expectations.

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Additional details

Publishing Information

Imprint Pagination
46 p.
ISSN
0418-9833
Report number
DESY--17-137

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
49046887
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
COUPLING CONSTANTS; DEEP INELASTIC SCATTERING; DISTRIBUTION FUNCTIONS; FACTORIZATION; GEV RANGE 100-1000; INCLUSIVE INTERACTIONS; INTEGRAL CROSS SECTIONS; JET MODEL; LEAST SQUARE FIT; LEPTON-PROTON INTERACTIONS; MULTIPLE PRODUCTION; NEUTRAL-CURRENT INTERACTIONS; PARTICLE STRUCTURE; PERTURBATION THEORY; PROTONS; QUANTUM CHROMODYNAMICS; RENORMALIZATION; SCALING LAWS; STRONG INTERACTIONS; THEORETICAL DATA
Descriptors DEC
BARYONS; CROSS SECTIONS; DATA; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; FIELD THEORIES; FUNCTIONS; FUNDAMENTAL INTERACTIONS; GEV RANGE; HADRONS; INELASTIC SCATTERING; INFORMATION; INTERACTIONS; LEPTON-BARYON INTERACTIONS; LEPTON-HADRON INTERACTIONS; LEPTON-NUCLEON INTERACTIONS; MATHEMATICAL MODELS; MATHEMATICAL SOLUTIONS; MAXIMUM-LIKELIHOOD FIT; NUCLEONS; NUMERICAL DATA; NUMERICAL SOLUTION; PARTICLE INTERACTIONS; PARTICLE MODELS; PARTICLE PRODUCTION; QUANTUM FIELD THEORY; SCATTERING

Optional Information

Collaborations
H1 Collaboration