The ATLAS SemiConductor Tracker (SCT) is one of the largest existing semiconductor detectors. It is situated between the Pixel detector and the Transition Radiation Tracker at one of the four ...interaction points of the Large Hadron Collider (LHC). During 2006-2007 the detector was lowered into the ATLAS cavern and installed in its final position. For the assembly, integration and commissioning phase, a complete Detector Control System (DCS) was developed to ensure the safe operation of the tracker. This included control of the individual powering of the silicon modules, a bi-phase cooling system and various types of sensors monitoring the SCT environment and the surrounding test enclosure. The DCS software architecture, performance and operational experience will be presented in the view of a validation of the DCS for the final SCT installation and operation phase.
A
bstract
The production of
J/ψ
mesons is studied with the LHCb detector using data from
pp
collisions at
TeV corresponding to an integrated luminosity of 71 nb
−1
. The differential cross-section ...for inclusive
J/ψ
production is measured as a function of its transverse momentum
p
T
. The cross-section in the fiducial region 0
< p
T
<
12 GeV
/c
and rapidity 2.0
<
<
4.5 is measured to be 5.6 ± 0.1 (stat) ± 0.4 (syst)
μ
b, with the assumption of unpolarised
J/ψ
production. The fraction of
J/ψ
production from
b
-hadron decays is measured to be (7
.
1 ± 0
.
6 (stat) ± 0
.
7 (syst))%.
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A
bstract
Evidence for the hadronic annihilation decay mode
is found with greater than 3
σ
significance. The branching fraction and
CP
asymmetry are measured to be
The last uncertainty on
is from the ...branching fractions of the
normalization mode and intermediate resonance decays. Upper limits are also set for the branching fractions of the related decay modes
and
, including the result
at the 90% credibility level.
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The properties of the orbitally excited (L=1) Bs(0) states are studied by using 1.0 fb(-1) of pp collisions at sqrts=7 TeV collected with the LHCb detector. The first observation of the ...Bs2*(5840)(0) meson decaying to B*+ K- is reported, and the corresponding branching fraction measured relative to the B+ K- decay mode. The Bs1(5830)(0)→B*+ K- decay is observed as well. The width of the Bs2*(5840)(0) state is measured for the first time, and the masses of the two states are determined with the highest precision to date. The observation of the Bs2*(5840)(0)→B*+ K- decay favors the spin-parity assignment J(P)=2+ for the Bs2*(5840)(0) meson. In addition, the most precise measurement of the mass difference m(B*+)-m(B+)=45.01±0.30(stat)±0.23(syst) MeV/c(2) is obtained.
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(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) Abstract Evidence for the hadronic annihilation decay mode ... is found with greater than 3sigma significance. The ...branching fraction and CP asymmetry are measured to be... The last uncertainty on ... is from the branching fractions of the ... normalization mode and intermediate resonance decays. Upper limits are also set for the branching fractions of the related decay modes ... and ..., including the result ... at the 90% credibility level.Figure not available: see fulltext.
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A
bstract
A measurement of the inclusive
Z
→ ττ cross-section in
pp
collisions at
is presented based on a dataset of 1
.
0 fb
−1
collected by the LHCb detector. Candidates for
Z
→ τ τ decays are ...identified through reconstructed final states with two muons, a muon and an electron, a muon and a hadron, or an electron and a hadron. The production cross-section for
Z
bosons, with invariant mass between 60 and 120 GeV
/c
2
, which decay to τ leptons with transverse momenta greater than 20 GeV
/c
and pseudorapidities between 2
.
0 and 4
.
5, is measured to be σ
pp
→Z→
ττ
= 71
.
4 ± 3
.
5 ± 2
.
8 ± 2
.
5 pb; the first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty on the integrated luminosity. The ratio of the cross-sections for
Z
→ τ τ to
Z
→
μμ
is determined to be 0
.
93 ± 0
.
09, where the uncertainty is the combination of statistical, systematic, and luminosity uncertainties of the two measurements.
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Search for the rare decay Adametz, A.; Adrover, C.; Ajaltouni, Z. ...
The journal of high energy physics,
14/1, Volume:
2013, Issue:
1
Journal Article
Peer reviewed
Open access
A
bstract
A search for the decay
is performed, based on a data sample of 1.0 fb
−1
of pp collisions at
collected by the LHCb experiment at the Large Hadron Collider. The observed number of candidates ...is consistent with the background-only hypothesis, yielding an upper limit of
< 11(9)
×
10
−9
at 95 (90)% confidence level. This limit is a factor of thirty below the previous measurement.
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(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) Abstract A search for the decay ... is performed, based on a data sample of 1.0 fb^sup -1^ of pp collisions at ... ...collected by the LHCb experiment at the Large Hadron Collider. The observed number of candidates is consistent with the background-only hypothesis, yielding an upper limit of ... < 11(9) × 10^sup -9^ at 95 (90)% confidence level. This limit is a factor of thirty below the previous measurement.
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