Measurement of $$\tau _\text {L}$$ τ L using the $${B} _s^0 \rightarrow J/\psi \eta $$ B s 0 → J / ψ η decay mode
Abstract Using a proton–proton collision data sample collected by the LHCb detector and corresponding to an integrated luminosity of $$5.7~\text {fb}^{-1}$$...
| Main Authors: | , , , , , , , , , , , , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2023
|
| Online Access: | https://hdl.handle.net/1721.1/151165 |
| Summary: | Abstract
Using a proton–proton collision data sample collected by the LHCb detector and corresponding to an integrated luminosity of
$$5.7~\text {fb}^{-1}$$
5.7
fb
-
1
, the lifetime of the light
$${{B} ^0_{s}} $$
B
s
0
mass eigenstate,
$$\tau _{L}$$
τ
L
, is measured using the
$$B^0_s \rightarrow J/\psi \eta $$
B
s
0
→
J
/
ψ
η
decay mode to be
$$\begin{aligned} \tau _{\text {L}} = 1.445 \pm 0.016 \text {(stat)} \pm 0.008 \text {(syst)} \,\text {ps}. \end{aligned}$$
τ
L
=
1.445
±
0.016
(stat)
±
0.008
(syst)
ps
.
A combination of this result with a previous LHCb analysis using an independent dataset corresponding to 3 fb
$$^{-1}$$
-
1
of integrated luminosity gives
$$\begin{aligned} \tau _{\text {L}} = 1.452 \pm 0.014 \pm 0.007 \pm 0.002 \,\text {ps}, \end{aligned}$$
τ
L
=
1.452
±
0.014
±
0.007
±
0.002
ps
,
where the first uncertainty is statistical, the second due to the uncorrelated part of the systematic uncertainty and the third due to the correlated part of the systematic uncertainty. |
|---|