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Two methods for the determination of beam energy spread near Λc+ Λ̄c− production threshold

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Published 11 December 2018 • © 2018 The Author(s)
, , Citation D. Liu et al 2018 JINST 13 P12017 DOI 10.1088/1748-0221/13/12/P12017

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1 State Key Laboratory of Particle Detection and Electronics, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

2 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China

3 INFN—National Laboratory of Frascati, Frascati, Italy

Dates

  1. Received 3 October 2018
  2. Accepted 27 November 2018
  3. Published

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1748-0221/13/12/P12017

Abstract

Two techniques are introduced to measure the beam energy spread in collision experiments of high energy physics, based on the threshold truncation effect and the beam-constrained mass spectra resolution, respectively. Both techniques are verified by Monte Carlo simulation, and take advantage of the BESIII collected data near the Λc+ Λ̄c− production threshold. The measured results are consistent with each other, and also accord with the extrapolation from the value measured at the J/ψ resonance.

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© 2018 The Author(s). Published by IOP Publishing Ltd on behalf of Sissa Medialab. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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10.1088/1748-0221/13/12/P12017