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Title: Fitting the Strong Coupling Constant with Soft-Drop Thrust

Abstract

Soft drop has been shown to reduce hadronisation effects at $e^+e^-$$ colliders for the thrust event shape. In this context, we perform fits of the strong coupling constant for the soft-drop thrust distribution at NLO+NLL accuracy to pseudo data generated by the \textsf{Sherpa}~event generator. In particular, we focus on the impact of hadronisation corrections, which we estimate both with an analytical model and a Monte-Carlo based one, on the fitted value of $$\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.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [4]
  1. INFN, Genoa
  2. Fermilab
  3. Gottingen U.
  4. IPhT, Saclay
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1546010
Report Number(s):
arXiv:1906.10504; FERMILAB-PUB-19-266-T; MCNET-19-14
1741249
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Marzani, Simone, Reichelt, Daniel, Schumann, Steffen, Soyez, Gregory, and Theeuwes, Vincent. Fitting the Strong Coupling Constant with Soft-Drop Thrust. United States: N. p., 2019. Web.
Marzani, Simone, Reichelt, Daniel, Schumann, Steffen, Soyez, Gregory, & Theeuwes, Vincent. Fitting the Strong Coupling Constant with Soft-Drop Thrust. United States.
Marzani, Simone, Reichelt, Daniel, Schumann, Steffen, Soyez, Gregory, and Theeuwes, Vincent. Tue . "Fitting the Strong Coupling Constant with Soft-Drop Thrust". United States. https://www.osti.gov/servlets/purl/1546010.
@article{osti_1546010,
title = {Fitting the Strong Coupling Constant with Soft-Drop Thrust},
author = {Marzani, Simone and Reichelt, Daniel and Schumann, Steffen and Soyez, Gregory and Theeuwes, Vincent},
abstractNote = {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 \textsf{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.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {6}
}