Fitting the strong coupling constant with soft-drop thrust

Marzani, Simone; Reichelt, Daniel; Schumann, Steffen; Soyez, Gregory; Theeuwes, Vincent

doi:10.1007/JHEP11(2019)179

Title: Fitting the strong coupling constant with soft-drop thrust

Journal Article · Fri Nov 29 00:00:00 EST 2019 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP11(2019)179· OSTI ID:1546010

Marzani, Simone ^[1]; Reichelt, Daniel ^[2]; Schumann, Steffen ^[3]; Soyez, Gregory ^[4]; Theeuwes, Vincent ^[5]

Univ. di Genova (Italy). Dept. di Fisica
Georg-August-Univ. at Göttingen (Germany). Inst. für Theoretische Physik; Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Georg-August-Univ. at Göttingen (Germany). Inst. für Theoretische Physik
Paris Saclay Univ., Gif-sur-Yvette (France). Inst. de Physique Théorique
Georg-August-Univ. at Göttingen (Germany). Inst. für Theoretische Physik; Paris Saclay Univ., Gif-sur-Yvette (France). Inst. de Physique Théorique

Soft drop has been shown to reduce hadronisation effects at $e^+e^-$ colliders for the thrust event shape. In this context, we perform fits of the strong coupling constant for the soft-drop thrust distribution at NLO+NLL accuracy to pseudo data generated by the Sherpa event generator. In particular, we focus on the impact of hadronisation corrections, which we estimate both with an analytical model and a Monte-Carlo based one, on the fitted value of $$\alpha_s(m_Z)$$. We find that grooming can reduce the size of the shift in the fitted value of $$\alpha_s$$ due to hadronisation. In addition, we also explore the possibility of extending the fitting range down to significantly lower values of (one minus) thrust. Here, soft drop is shown to play a crucial role, allowing us to maintain good fit qualities and stable values of the fitted strong coupling. The results of these studies show that soft-drop thrust is a promising candidate for fitting $$\alpha_s$$ at $e^+ e^-$ colliders with reduced impact of hadronisation effects.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1546010

Report Number(s):: arXiv:1906.10504; FERMILAB-PUB-19-266-T; MCNET-19-14; oai:inspirehep.net:1741249

Journal Information:: Journal of High Energy Physics (Online), Vol. 2019, Issue 11; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 24 works

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