Measurement of b hadron lifetimes in pp collisions at root s=8TeV
Measurements are presented of the lifetimes of the B0, B0 s, 0 b, and B+ c hadrons using the decay channels B0 → J/ψK∗(892)0, B0 → J/ψK0 S, B0 s → J/ψπ+π−, B0 s → J/ψφ(1020), Λ0 b → J/ψ0, and B+ c → J/ψπ+. The data sample, corresponding to an integrated luminosity of 19.7 fb−1, was colle...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Springer Nature
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/70307/1/70307_Measurement%20of%20b%20hadron%20lifetimes%20in%20pp%20_article.pdf http://irep.iium.edu.my/70307/2/70307_Measurement%20of%20b%20hadron%20lifetimes%20in%20pp%20_scopus.pdf http://irep.iium.edu.my/70307/ https://link.springer.com/content/pdf/10.1140%2Fepjc%2Fs10052-018-5929-3.pdf |
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| Summary: | Measurements are presented of the lifetimes of
the B0, B0
s, 0
b, and B+
c hadrons using the decay channels B0 → J/ψK∗(892)0, B0 → J/ψK0
S, B0
s → J/ψπ+π−,
B0
s → J/ψφ(1020), Λ0
b → J/ψ0, and B+
c → J/ψπ+. The
data sample, corresponding to an integrated luminosity of
19.7 fb−1, was collected by the CMS detector at the LHC
in proton–proton collisions at √s = 8 TeV. The B0 lifetime is measured to be 453.0 ± 1.6 (stat) ± 1.8 (syst)µm
in J/ψK∗(892)0and 457.8 ± 2.7 (stat) ± 2.8 (syst)µm in
J/ψK0
S, which results in a combined measurement of cτB0 =
454.1 ± 1.4 (stat) ± 1.7 (syst)µm. The effective lifetime of
the B0
s meson is measured in two decay modes, with contributions from different amounts of the heavy and light
eigenstates. This results in two different measured lifetimes:
cτB0
s→J/ψπ+π− = 502.7 ± 10.2 (stat) ± 3.4 (syst)µm and
cτB0
s→J/ψφ(1020) = 443.9 ± 2.0 (stat) ± 1.5 (syst)µm. The
0
b lifetime is found to be 442.9 ± 8.2 (stat) ± 2.8 (syst)µm.
The precision from each of these channels is as good as or better than previous measurements. The B+
c lifetime, measured
with respect to the B+ to reduce the systematic uncertainty,
is 162.3 ± 7.8 (stat) ± 4.2 (syst) ± 0.1 (τB+ )µm. All results
are in agreement with current world-average values. |
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