Conference Presentation

PUBDB-2018-03509

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Determination of the strong coupling constant $\alpha_s(m_z)$ n NNLO using H1 jet cross section measurements

Britzger, D. (Corresponding author)Extern* ; H1 Collaboration (Collaboration author)DESY*

2018

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Please use a persistent id in citations: doi:10.3204/PUBDB-2018-03509

Abstract: 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.

Note: Talk given on August 28, 2018 for the H1 Collaboration and NNLOJET; Primary authors: Stefan Schmitt (DESY), Daniel Britzger (Ruprecht Karls University)

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Contributing Institute(s):

1. H1 / Uni Hamburg (H1/HAM2)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)

Experiment(s):

1. HERA: H1

Appears in the scientific report 2018

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