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A method to determine |Vcb| at the weak scale in top decays at the LHC
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Harrison, P. F. and Vladimirov, V. E. (2019) A method to determine |Vcb| at the weak scale in top decays at the LHC. Journal of High Energy Physics, 2019 (1). 191. doi:10.1007/JHEP01(2019)191 ISSN 1029-8479.
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Official URL: http://dx.doi.org/10.1007/JHEP01(2019)191
Abstract
Until now, the Cabibbo Kobayashi Maskawa matrix element, |Vcb|, has always been measured in B decays, i.e. at an energy scale qb∼mb2, far below the weak scale. We consider here the possibility of measuring it close to the weak scale, at qW ∼ mW, in top decays at the Large Hadron Collider (LHC). Our proposed method would use data from the LHC experiments in hadronic top decays t→bW+→bb¯¯c, tagged by the semileptonic decay of the associated top. We estimate the uncertainty of such a measurement, as a function of present and potential future experimental jet flavour-tagging performances, and conclude that first measurements using the data collected during 2016-2018 could yield a fractional error on |Vcb| of order 7% per experiment. We also give projected performances at higher luminosities, representative of those anticipated at LHC Run 3 and HL-LHC.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Journal or Publication Title: | Journal of High Energy Physics | ||||||||
Publisher: | Springer | ||||||||
ISSN: | 1029-8479 | ||||||||
Official Date: | January 2019 | ||||||||
Dates: |
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Volume: | 2019 | ||||||||
Number: | 1 | ||||||||
Article Number: | 191 | ||||||||
DOI: | 10.1007/JHEP01(2019)191 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 19 October 2020 | ||||||||
Date of first compliant Open Access: | 19 October 2020 |
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