The LHCb calorimeter detectors Dzhelyadin, R.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2007, Letnik:
581, Številka:
1
Journal Article
Recenzirano
The calorimeter detectors constructed for the LHCb experiment are being described. An emphasis is made on the performance study both using cosmic particles and with a test beam. Detectors are ...installed and presently undergo commissioning with embedded calibration and monitoring features.
The Hadron Calorimeter of LHCb (HCAL) is one of the four sub-detectors of the experiment calorimetric system, which also includes: Scintillator Pad Detector (SPD), Pre-Shower Detector (PS), and ...electromagnetic (ECAL) calorimeter. The main purpose of HCAL is to provide data for Level-0 trigger for selection events with high transverse energy hadrons. It is important to have a precise and reliable calibration system which produces result immediately after the calibration run. LHCb HCAL is equipped with a calibration system based on 137Cs radioactive source embedded into the calorimeter structure. It allows to obtain absolute calibration with good precision and monitor technical condition of the detector.
The LHCb hadron calorimeter Dzhelyadin, R.I
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2002, Letnik:
494, Številka:
1
Journal Article
Recenzirano
The Hadron Calorimeter (HCAL) is designed for the LHCb experiment. The main purpose of the detector is to provide data for the L0 hadron trigger. The HCAL is designed as consisting of two symmetric ...movable parts of about 500 ton in total getting in touch in operation position without non-instrumented zones. The lateral dimensions of an active area are
X=8.4
m
width,
Y=6.8
m
height, and is distanced from the interaction point at
Z=13.33
m
. Both halves are assembled from stacked up modules.
An internal structure consisting of thin iron plates interspaced with scintillating tiles has been chosen. Attention is paid to optimize the detector according to the requirements of the experiment, reducing the spending needed for its construction. Different construction technologies are being discussed.
The calorimeter properties have been extensively studied with a variety of prototype on the accelerator beam. The calibration with a radioactive source and module-0 construction experience is discussed.
Analysis of milk micrbiomes from healthy cows and cows with different (clinical and subclinical) forms of mastitis was performed at two farms of the Central Russia. An increase in the operational ...taxonomic units (OTUs) of bacteria of the phylum
Proteоbacteria
belonging primarily to Pseudomonadales, Burkholderiales, as well as Streptococcaceae, Staphylococcaceae, and Bacillaceae in the animals with mastitis was detected. The Planococcaceae OTU percentage decreased. The ratio of rarely presented OTUs also changed in the milk of animals with mastitis.
The entire T7 bacteriophage genome contains 39937 base pairs (Database NCBI RefSeq N1001604). Here, electrostatic potential distribution around double helical T7 DNA was calculated by Coulomb method ...using the computer program of Sorokin A.A. (lptolik@gmail.com). Electrostatic profiles of 17 promoters recognized by T7 phage-specific RNA polymerase were analyzed. It was shown that electrostatic profiles of all T7 RNA polymerase-specific promoters can be characterized by distinctive motifs which are specific for each promoter class. Comparative analysis of electrostatic profiles of native T7 promoters of different classes demonstrates that T7 RNA polymerase can differentiate them due to their electrostatic features.
Experimental investigations of candidates for hybrid mesons in the VES experiment at the Institute for High Energy Physics (Protvino) are surveyed. The data in question concern {pi}{sub 1}(1400) ...characterized by the exotic quantum numbers of J{sup PC} = 1{sup -+} and observed in the {eta}{pi}{sup -} final state; J{sup PC} 1{sup -+} {pi}{sub 1}(1600) in the {eta}{sup '}{pi}{sup -}, b{sub 1}(1235){pi}, and f{sub 1}(1285){pi}{sup -} final states; and J{sup PC} = 0{sup -+} {pi}(1800) in the f{sub 0}(980){pi}{sup -}, f{sub 0}(1300){pi}{sup -}, f{sub 0}(1500){pi}{sup -}, and a{sub 0}{sup -}(980){eta} final states. New results are given along with data published previously.
The results of a partial wave analysis of 3π system produced in the reaction
π
−
A →
π
+
π
−
π
−
A at the momentum of 36.6 GeV/c on beryllium target are presented. Resonant signals from
a′
1(1750),
a
...3(1860),
a
4(2050) are observed in different channels. Small bump at
M ≈ 1.6GeV in the exotic wave
J
PC
M
η
= 1
−+1
+ is seen. The combined analysis of VES data on this wave in η′π,
b
1(1235)
π and ϱπ channels points to the existence of a hybrid meson with
M ≈ 1.6 GeV.
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