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Measurement of Υ production in pp collisions at $$ \sqrt{s} $$ = 5 TeV
The production cross-sections of Υ mesons, namely Υ(1 S ), Υ(2 S ) and Υ(3 S ), in pp collisions at $$ \sqrt{s} $$ s = 5 TeV are measured with a data sample corresponding to an integrated luminosity of 9 . 13 ± 0 . 18 pb − 1 collected by the LHCb detector. The Υ mesons are reconstructed in the decay...
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Published in: | The journal of high energy physics 2023-07, Vol.2023 (7), Article 69 |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
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Summary: | The production cross-sections of Υ mesons, namely Υ(1
S
), Υ(2
S
) and Υ(3
S
), in
pp
collisions at
$$ \sqrt{s} $$
s
= 5 TeV are measured with a data sample corresponding to an integrated luminosity of 9
.
13
±
0
.
18 pb
−
1
collected by the LHCb detector. The Υ mesons are reconstructed in the decay mode Υ →
μ
+
μ
−
. Double differential cross-sections times branching fractions, as functions of the transverse momentum
p
T
and the rapidity
y
of the Υ mesons, are measured in the range
p
T
<
20 GeV/
c
and 2
.
0
< y <
4
.
5. The results integrated over these
p
T
and
y
ranges are
$$ \sigma \left(\textrm{Y}(1S)\right)\times \mathcal{B}\left(\textrm{Y}(1S)\to {\mu}^{+}{\mu}^{-}\right)=2101\pm 33\pm 83\ \textrm{pb}, $$$ \sigma \left(\textrm{Y}(2S)\right)\times \mathcal{B}\left(\textrm{Y}(2S)\to {\mu}^{+}{\mu}^{-}\right)=526\pm 20\pm 21\ \textrm{pb}, $$$ \sigma \left(\textrm{Y}(3S)\right)\times \mathcal{B}\left(\textrm{Y}(3S)\to {\mu}^{+}{\mu}^{-}\right)=242\pm 16\pm 10\ \textrm{pb}, $$
σ
Υ
1
S
×
B
Υ
1
S
→
μ
+
μ
−
=
2101
±
33
±
83
pb
,
σ
Υ
2
S
×
B
Υ
2
S
→
μ
+
μ
−
=
526
±
20
±
21
pb
,
σ
Υ
3
S
×
B
Υ
3
S
→
μ
+
μ
−
=
242
±
16
±
10
pb
,
where the first uncertainties are statistical and the second are systematic. The ratios of cross-sections between measurements of two different Υ states and between measurements at different centre-of-mass energies are determined. The nuclear modification factor of Υ(1
S
) at
$$ \sqrt{s} $$
s
= 5 TeV is updated as well using the directly measured cross-section results from this analysis. |
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ISSN: | 1029-8479 1029-8479 |
DOI: | 10.1007/JHEP07(2023)069 |