Measurement of the branching fraction of the $${{B} ^0} {\rightarrow }{{D} ^+_{s}} {{\pi } ^-} $$ B 0 → D s + π - decay
Abstract A branching fraction measurement of the $${{B} ^0} {\rightarrow }{{D} ^+_{s}} {{\pi } ^-} $$...
| Main Authors: | , , , , , , , , , , , , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2021
|
| Online Access: | https://hdl.handle.net/1721.1/136764 |
| Summary: | Abstract
A branching fraction measurement of the
$${{B} ^0} {\rightarrow }{{D} ^+_{s}} {{\pi } ^-} $$
B
0
→
D
s
+
π
-
decay is presented using proton–proton collision data collected with the LHCb experiment, corresponding to an integrated luminosity of
$$5.0\,\text {fb} ^{-1} $$
5.0
fb
-
1
. The branching fraction is found to be
$${\mathcal {B}} ({{B} ^0} {\rightarrow }{{D} ^+_{s}} {{\pi } ^-} ) =(19.4 \pm $$
B
(
B
0
→
D
s
+
π
-
)
=
(
19.4
±
$$1.8\pm 1.3 \pm 1.2)\times 10^{-6}$$
1.8
±
1.3
±
1.2
)
×
10
-
6
, where the first uncertainty is statistical, the second systematic and the third is due to the uncertainty on the
$${{B} ^0} {\rightarrow }{{D} ^-} {{\pi } ^+} $$
B
0
→
D
-
π
+
,
$${{D} ^+_{s}} {\rightarrow }{{K} ^+} {{K} ^-} {{\pi } ^+} $$
D
s
+
→
K
+
K
-
π
+
and
$${{D} ^-} {\rightarrow }{{K} ^+} {{\pi } ^-} {{\pi } ^-} $$
D
-
→
K
+
π
-
π
-
branching fractions. This is the most precise single measurement of this quantity to date. As this decay proceeds through a single amplitude involving a
$$b{\rightarrow }u$$
b
→
u
charged-current transition, the result provides information on non-factorisable strong interaction effects and the magnitude of the Cabibbo–Kobayashi–Maskawa matrix element
$$V_{ub}$$
V
ub
. Additionally, the collision energy dependence of the hadronisation-fraction ratio
$$f_s/f_d$$
f
s
/
f
d
is measured through
$${{\overline{B}} {}^0_{s}} {\rightarrow }{{D} ^+_{s}} {{\pi } ^-} $$
B
¯
s
0
→
D
s
+
π
-
and
$${{B} ^0} {\rightarrow }{{D} ^-} {{\pi } ^+} $$
B
0
→
D
-
π
+
decays. |
|---|