Accessing CKM suppressed top decays at the LHC

Journal Article · 24 May 2024 · SciPost Physics

DOI: https://doi.org/10.21468/SciPostPhys.16.5.131 · OSTI ID:2367240

Faroughy, Darius A. ; F. Kamenik, Jernej; Szewc, Manuel; Zupan, Jure

We propose an extension of the existing experimental strategy for measuring branching fractions of top quark decays, targeting specifically t\to j_q W $t\to j_{q}W$ , where j_q $j_q$ is a light quark jet. The improved strategy uses orthogonal b $b$ - and q $q$ -taggers, and adds a new observable, the number of light-quark-tagged jets, to the already commonly used observable, the fraction of b $b$ -tagged jets in an event. Careful inclusion of the additional complementary observable significantly increases the expected statistical power of the analysis, with the possibility of excluding |V_{tb}|=1 $\left|V_{tb}\right|=1$ at 95\% $95\%$ C.L. at the HL-LHC, and accessing directly the standard model value of |V_{td}|^2+|V_{ts}|^2 ${\left|V_{td}\right|}^2+{\left|V_{ts}\right|}^2$ .

• Sponsoring Organization: USDOE
• Grant/Contract Number: SC0011784
• OSTI ID: 2367240
• Journal Information: SciPost Physics, Journal Name: SciPost Physics Vol. 16 Journal Issue: 5; ISSN 2542-4653
• Publisher: Stichting SciPostCopyright Statement
• Country of Publication: Netherlands
• Language: English