20.500.12556/RUL-178833
Search for $B^0 \to K^{*0}\tau^+\tau^-$ decays at the Belle II experiment
We present a search for the rare flavor-changing neutral-current decay $B^0 \to K^{\ast 0}\tau^+\tau^-$ with data collected by the Belle II experiment at the SuperKEKB electron-positron collider. The analysis uses a 365 fb$^{−1}$ data sample recorded at the center-of-mass energy of the $\Upsilon(4S)$ resonance. One of the $B$ mesons produced in the $\Upsilon(4S)\to B^0 \bar{B}^0$ process is fully reconstructed in a hadronic decay mode, while its companion $B$ meson is required to decay into a $K^{\ast 0}$ and two $\tau$ leptons of opposite charge. The $\tau$ leptons are reconstructed in final states with a single electron, muon, charged pion or charged $\rho$ meson, and additional neutrinos. We set an upper limit on the branching fraction of $\mathcal{B}(B^0 \to K^{\ast 0} \tau^+ \tau^-) < 1.8 \times 10^{-3}$ at the 90% confidence level, which is the most stringent constraint reported to date.
experimental physics
physics of elementary particles
particle decays
eksperimentalna fizika
fizika osnovnih delcev
razpadi delcev
true
false
true
Angleški jezik
Slovenski jezik
Članek v reviji
2026-01-30 10:33:03
2026-01-30 10:33:03
2026-02-01 04:37:57
0000-00-00 00:00:00
2025
0
0
Str. 151801-1-151801-8
iss. 15
Vol. 135
Oct. 2025
0000-00-00
Zaloznikova
Objavljeno
NiDoloceno
0000-00-00
0000-00-00
0000-00-00
539.1
0031-9007
10.1103/v1q3-9dy8
266682627
v1q3-9dy8_(1).pdf
v1q3-9dy8_(1).pdf
1
D5D94CB15BE6BBE8188BDA2CFB2AABC5
03c3d07e2c8f2c7af630da11fe2c12721640e850e14a5a12c04f7032f2eb844e
de86d385-fdc2-11f0-a1ba-0050569b8976
https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=226841
https://journals.aps.org/prl/abstract/10.1103/v1q3-9dy8
0
e3756a4a-fdc2-11f0-a1ba-0050569b8976
https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=226842
Fakulteta za matematiko in fiziko
0
0
0