Determination of the strong coupling constant α<sub>s</sub> (<i>m</i><sub>Z</sub>) in next-to-next-to-leading order QCD using H1 jet cross section measurements (vol 77, 791, 2017)



Andreev, V, Baghdasaryan, A, Begzsuren, K, Belousov, A, Bertone, V, Bolz, A, Boudry, V, Brandt, G, Brisson, V, Britzger, D
et al (show 137 more authors) (2021) Determination of the strong coupling constant α<sub>s</sub> (<i>m</i><sub>Z</sub>) in next-to-next-to-leading order QCD using H1 jet cross section measurements (vol 77, 791, 2017). EUROPEAN PHYSICAL JOURNAL C, 81 (8). 738-.

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Abstract

<jats:title>Abstract</jats:title><jats:p>The determination of the strong coupling constant <jats:inline-formula><jats:alternatives><jats:tex-math>$$\alpha _{\mathrm{s}} (m_{\mathrm{Z}})$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>α</mml:mi> <mml:mi>s</mml:mi> </mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:msub> <mml:mi>m</mml:mi> <mml:mi>Z</mml:mi> </mml:msub> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> from H1 inclusive and dijet cross section data [1] exploits perturbative QCD predictions in next-to-next-to-leading order (NNLO) [2–4]. An implementation error in the NNLO predictions was found [4] which changes the numerical values of the predictions and the resulting values of the fits. Using the corrected NNLO predictions together with inclusive jet and dijet data, the strong coupling constant is determined to be <jats:inline-formula><jats:alternatives><jats:tex-math>$$\alpha _{\mathrm{s}} (m_{\mathrm{Z}}) =0.1166\,(19)_{\mathrm{exp}}\,(24)_{\mathrm{th}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>α</mml:mi> <mml:mi>s</mml:mi> </mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:msub> <mml:mi>m</mml:mi> <mml:mi>Z</mml:mi> </mml:msub> <mml:mo>)</mml:mo> </mml:mrow> <mml:mo>=</mml:mo> <mml:mn>0.1166</mml:mn> <mml:mspace /> <mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:mn>19</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> <mml:mi>exp</mml:mi> </mml:msub> <mml:mspace /> <mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:mn>24</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> <mml:mi>th</mml:mi> </mml:msub> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>. Complementarily, <jats:inline-formula><jats:alternatives><jats:tex-math>$$\alpha _{\mathrm{s}} (m_{\mathrm{Z}})$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>α</mml:mi> <mml:mi>s</mml:mi> </mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:msub> <mml:mi>m</mml:mi> <mml:mi>Z</mml:mi> </mml:msub> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> is determined together with parton distribution functions of the proton (PDFs) from jet and inclusive DIS data measured by the H1 experiment. The value <jats:inline-formula><jats:alternatives><jats:tex-math>$$\alpha _{\mathrm{s}} (m_{\mathrm{Z}}) =0.1147\,(25)_{\mathrm{tot}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>α</mml:mi> <mml:mi>s</mml:mi> </mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:msub> <mml:mi>m</mml:mi> <mml:mi>Z</mml:mi> </mml:msub> <mml:mo>)</mml:mo> </mml:mrow> <mml:mo>=</mml:mo> <mml:mn>0.1147</mml:mn> <mml:mspace /> <mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:mn>25</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> <mml:mi>tot</mml:mi> </mml:msub> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> obtained is consistent with the determination from jet data alone. Corrected figures and numerical results are provided and the discussion is adapted accordingly.</jats:p>

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 13 Dec 2021 16:19
Last Modified: 15 Mar 2024 06:53
DOI: 10.1140/epjc/s10052-021-09394-0
Open Access URL: https://link.springer.com/article/10.1140%2Fepjc%2...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3145306