Measuring |Vts| directly using strange-quark tagging at the LHC

• Published in: Journal of the Korean Physical Society Vol. 81; no. 5; pp. 377 - 385
• Main Authors: Jang, Woojin, Lee, Jason Sang Hun, Park, Inkyu, Watson, Ian James
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01-09-2022; Springer Nature B.V; 한국물리학회
• Subjects: Decay; Kaons; Large Hadron Collider; Luminosity; Marking; Mathematical and Computational Physics; Original Paper - Particles and Nuclei; Particle and Nuclear Physics; Physics; Physics and Astronomy; Quarks; Theoretical; Uncertainty; 물리학; CKM matrix; Top quark; jet tagging
• ISSN: 0374-4884; 1976-8524
• DOI: 10.1007/s40042-022-00542-7

The Cabibbo–Kobayashi–Maskawa (CKM) element
V
ts
, representing the coupling between the top and strange quarks, is currently best determined through fits based on the unitarity of the CKM matrix, and measured indirectly through box-diagram oscillations, and loop-mediated rare decays of the
B
or
K
mesons. It has been previously proposed to use the tree level decay of the
t
quark to the
s
quark to determine
|
V
ts
|
at the LHC, which has become a top factory. In this paper, we extend the proposal by performing a detailed analysis of measuring
t
→
s
W
in dileptonic
t
t
¯
events. In particular, we perform detector response simulation, including the reconstruction of
K
S
0
, which are used for tagging jets produced by
s
quarks against the dominant
t
→
b
W
decay. We show that it should be possible to exclude
|
V
ts
|
=
0
at 5.5
σ
with the expected High Luminosity LHC luminosity of 3000 fb
-
1
, considering only the statistical uncertainties, and not the systematic uncertainties which will play a role in setting the final analysis limits.