Measurement of the production of a W boson in association with a charmed hadron in pp collisions at ffiffi s p =13 TeV with the ATLAS detector
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American Physical Society
Date
2023-08-14Referencia bibliográfica
Aad, G., Abajyan, T., Abbott, B., Abdallah, J., Abdel Khalek, S., Aben, R., ... & Baranov, S. P. (2014). Measurement of the production of a W boson in association with a charm quark in pp collisions at $\sqrt {s} $= 7 TeV with the ATLAS detector. Journal of High Energy Physics, 2014(5), 1-67.[https://doi.org/10.1103/PhysRevD.108.032012]
Abstract
The production of a
W
boson in association with a single charm quark is studied using
140
fb
−
1
of
√
s
=
13
TeV
proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The charm quark is tagged by the presence of a charmed hadron reconstructed with a secondary-vertex fit. The
W
boson is reconstructed from the decay to either an electron or a muon and the missing transverse momentum present in the event. The charmed mesons reconstructed are
D
+
→
K
−
π
+
π
+
and
D
*
+
→
D
0
π
+
→
(
K
−
π
+
)
π
+
and the charge conjugate decays in the fiducial regions where
p
T
(
e
,
μ
)
>
30
GeV
,
|
η
(
e
,
μ
)
|
<
2.5
,
p
T
(
D
(
*
)
)
>
8
GeV
, and
|
η
(
D
(
*
)
)
|
<
2.2
. The integrated and normalized differential cross sections as a function of the pseudorapidity of the lepton from the
W
boson decay, and of the transverse momentum of the charmed hadron, are extracted from the data using a profile likelihood fit. The measured total fiducial cross sections are
σ
OS
–
SS
fid
(
W
−
+
D
+
)
=
50.2
±
0.2
(
stat
)
+
2.4
−
2.3
(
syst
)
pb
,
σ
OS
–
SS
fid
(
W
+
+
D
−
)
=
48.5
±
0.2
(
stat
)
+
2.3
−
2.2
(
syst
)
pb
,
σ
OS
–
SS
fid
(
W
−
+
D
*
+
)
=
51.1
±
0.4
(
stat
)
+
1.9
−
1.8
(
syst
)
pb
, and
σ
OS
–
SS
fid
(
W
+
+
D
*
−
)
=
50.0
±
0.4
(
stat
)
+
1.9
−
1.8
(
syst
)
pb
. Results are compared with the predictions of next-to-leading-order quantum chromodynamics calculations performed using state-of-the-art parton distribution functions. Additionally, the ratio of charm to anticharm production cross sections is studied to probe the
s
−
¯
s
quark asymmetry. The ratio is found to be
R
±
c
=
0.971
±
0.006
(
stat
)
±
0.011
(
syst
)
. The ratio and cross-section measurements are consistent with the predictions obtained with parton distribution function sets that have a symmetric
s
−
¯
s
sea, indicating that any
s
−
¯
s
asymmetry in the Bjorken-
x
region relevant for this measurement is small.
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