The lhcb experiment is dedicated to precision measurements of cp violation and rare decays of b hadrons at the large hadron collider lhc at cern geneva. The aim of the lhcb experiment is to record the decay of particles containing b and antib quarks, collectively known as b mesons. Trigger selections writing to the turbo stream are intended for. The lhcb detector is a forward spectrometer at the large hadron collider lhc at cern. Lhcb detector combed through protonproton collision data collected in 2016 and found no evidence for an excess of muonantimuon pairs that could indicate dark photons. After about five years it will have recorded a data sample of 10 fb. The main goals of a detector safety system dss for the experiments at the lhc are to protect the experiment, with that the investment into it, and to avoid situations leading to alarmsoflevel3 in order to increase the running time of the experiment. The initial configuration and expected performance of the detector and associated systems, as established by test beam measurements and simulation studies, is described. The lhcb experiment is dedicated to precision measurements of cp violation. The charged particles are bent by a warm dipole magnet which has a. Studies of d 0 k0 hh decays at the lhcb experiment inspire hep. Characterisation and commissioning of the lhcb velo detector. The lhcb detector model designed by nathan readioff vertex locator rich1 magnet electromagnetic rich2 calorimeter muon chambers main tracker hadronic calorimeter lhcb is a particle detector at the large hadron collider lhc in cern that has been specially designed to investigate the slight differences between the properties of matter and. The decay products of b mesons are identified and measured by different detector components.
Lhcb detector is a specialized detector for the study of bquark physics. Performance of the lhcb tracking detectors mark tobin 2 1. The operation and control, software, and online monitoring of the rich system are described. Lhcb is a specialized bphysics experiment, designed primarily to measure the parameters of cp violation in the interactions of bhadrons heavy particles containing a bottom quark. Specs the serial protocol for the experiment control. Lhcb scintillating fiber detector front end electronics. The basic detector unit controlled by the dcs is an hpd column. Eddy jans nikhef on behalf of the lhcb collaboration design of subdetectors, trigger and daq performance. Pdf the large hadron collider beauty experiment lhcb, one of the four largest.
It then took almost 15 years of effort by over 730 people from many universities and institutes across 15 countries, to complete the construction of lhcb. The detector itself is a manylayered instrument designed to detect some of the tiniest yet most energetic particles ever created on earth. The lhcb detector at the large hadron collider springerlink. The trigger and realtime reconstruction at lhcb cpad. Represents many touchable detector elements differing only in their positioning g4pvdivision. Pdf the lhcb experiment is upgrading part of its detector and the entire readout system towards a full 40 mhz readout system in order to run between. It does this by searching for a particle called the beauty quark. The present paper describes the lhcb experiment, its interface to the machine, the spectrom. Cern european laboratory for particle physics, ch1211, geneva 23, switzerland. A beam loss scintillator system for background monitoring.
Geant4 cms geometry imported in root through gdml 19000 physical volumes cms. Lhcb detector and performance neville harnew at end of the 2010 lhc running period, the peak instantaneous luminosity was almost at the design value of 2. About 700 scientists from 66 different institutes and universities make up the lhcb collaboration october 20. In this paper the performance of the various lhcb sub detectors and the trigger system are described, using data taken from 2010 to 2012. Closest to the protonproton interaction region is the vertex detector, known as the velo. The lhcb detector 19, 20 is a singlearm forward spectrometer covering the pseudorapidity range 2 pdf the lhcb experiment is upgrading part of its detector and the entire readout system towards a full 40 mhz readout system in order to run between. The lhcb experiment plans a major upgrade of the detector and daq system in the lhc long shutdown ii 20182019. A beam loss scintillator system for background monitoring at.
Cern lhcb dp2012003 september 18, 20 performance of the lhcb rich detector at the lhc the lhcb rich group1 abstract the lhcb experiment has been taking data at the large hadron collider lhc at cern since the end of 2009. This means that while the detector only covers around 4% solid angle, it is able to measure around 40% of b meson production. Independent luminosity measurement the bls system is extremely sensitive to colliding beams due to its position within the lhcb detector. The lhcb experiment has been taking data at the large hadron collider lhc at cern since the end of 2009.
The lhcb detector 19, 20 is a singlearm forward spectrometer covering the pseudorapidity range 2 lhcb velo detector a high precision silicon device for vertexing, tracking and triggering in lhcb. The lhcb rich dcs the detector control system dcs for the lhcb rich has the functions to power the detectors, ensure their safe operation and collect and archive all environmental information required for the analysis of the rich data. This provides charged particle identification over a wide momentum range, from 2100 gevc. The atlas detector weighs 7,000 tonnes, similar to the weight of the eiffel tower. The large hadron collider lhc evans, the lhc machine, pos epshep2009 004, 2009 is a synchrotron particle accelerator with a circumference of 27 km located about 100 m underground at cern in the surroundings of geneva, switzerland. Pdf real time analysis with the upgraded lhcb trigger in run iii.
Welcome to the public pages of the lhcb velo project. Its a 10mbits serial bus, designed to be simple, cheap and reliable. The 5600tonne lhcb detector is made up of a forward spectrometer and planar detectors. Introduction 3 the lhcb experiment 1 is a single arm spectrometer designed to study heavy. The lhcb detector at the lhc iopscience institute of physics. The track reconstruction uses hits in the velo, the tracker turicensis tt, which is located upstream of the. Lhcbsoftwaretutorials lhcb new framework tutorial by sebastien ponce, initially at the 5th lhcb software hackathon, january 2017 how to structure efficient algorithms by christopher jones at the 6th lhcb software hackathon, march 2017 the git tool and best practices by sebastien ponce at the 7th lhcb software hackathon, june 2017. Lhcb detector causes trouble for supersymmetry theory the lhcb detector has failed to turn up any significant deviations from the john timmer aug 29, 2011 8. Eddy jans nikhef on behalf of the lhcb collaboration design of sub detectors, trigger and daq performance. Its construction and installation is progressing on. Lhcb experiment was designed to studying cpviolation and search for new physics.
The lhcb detector 19, 20 is a singlearm forward spectrometer covering the pseudorapidity range 2 detector includes a. By using a time to digital converter tdc, the particle arrival. Detector lhcb large hadron collider beauty experiment. The lhcb experiment is dedicated to precision measurements of cp violation and. It is shown that the design criteria of the experiment. Pdf the large hadron collider beauty experiment calorimeters. The lhcb experiment is designed to operate at an lhc luminosity of 2. The ability to reconstruct the b production and decay vertices is vital to our physics program. The crosssection of the bls system, expressed in b, is calibrated with the lhcb l0calo trigger rate, whose. Lhcbsimulation lhcb simulation software, built on the gaudi framework. The lhcb detector at the lhc article pdf available in journal of instrumentation 308. Detector components were built all over the world under the responsibility of the collaborating institutes and with participation of privatesector companies in the member nations, and then delivered to cern as contributions to the lhcb experiment. Dec 21, 20 lhcb is an experiment at the cern lhc dedicated to beauty and charm hadron physics.
Lhcb scintillating fiber detector front end electronics design and quality assurance view the table of contents for this issue, or go to the journal homepage for more home search collections journals about contact us my iopscience you may also be interested in. Write out more complicated variables such isolation, jets, etc. One of its key detector components is the ringimaging cherenkov rich system. Lhcb detector causes trouble for supersymmetry theory ars. The experiment is designed for precision measurements of cp violation and rare decays of beauty and charm hadrons. Home cern experiments lhc experiments lhcb lhcb detector performance papers the lhcb detector at the lhc. Lhcb is a dedicated second generation b physics precision experiment at the lhc with the aim of studying cp violation and rare b decays.
Template for writing lhcb papers pdf file, gitlab repository. Selection and processing of calibration samples to measure the. Two of the four conductive layers of the flex circuit are used for digital. Performance of lhcb silicon tracker detector in the lhc. It consist of a first phase where the events are generated e. Posvertex 2012047 performance of the lhcb tracking detectors mark tobin 41 of the lhcb magnet. This is a particular challenge for the lhcb experiment, where many important signals. Gerhard raven nikhef and vu, amsterdam representing the lhcb collaboration beauty 2003, carnegie mellon university. Today, lhcb has successfully started to take data and we are very excited by. The lhcb large hadron collider beauty experiment is one of eight particle physics detector experiments collecting data at the large hadron collider at cern.
The experiment is dedicated to the study of subtle differences between matter and antimatter and to the searches for new physics through the ultrafast decays of particles produced in high energy protonproton collisions. For the lhcb purposes, the bls provides a continuousmonitoringofthisgap,lookingforpossibledistribution which could arise duringperiods of beam. Lhcb detector causes trouble for supersymmetry theory. The team running the large hadron collider beauty lhcb detector combed through protonproton collision data collected in 2016 and found no evidence for an excess of muonantimuon pairs that could indicate dark photons. The primary goal of lhcb is to search for indirect evidence of new 5 physics in cp violation and rare decays of b and c hadrons. Next is the large hadron collider beauty lhcb detector site.
Flowchart for publication of detector performance papers. The rich detectors for the upgraded lhcb experiment. Such studies can help to explain the matterantimatter. The purpose of the lhcb is to search for evidence of antimatter. May 15, 20 the lhcb experiment has been taking data at the large hadron collider lhc at cern since the end of 2009. It is 21 metres long, 10 metres high and metres wide, and sits 100 metres below ground near the village of ferneyvoltaire, france. The lhcb detector is a forward spectrometer at the large hadron. S08005 august 2008 with 195 reads how we measure reads.
A measurement of z using the lhcb detector at cern. However this luminosity was delivered in only 344 colliding bunches i. Christopher crockett is a freelance writer based in montgomery, alabama. The largest volume detector ever constructed for a particle collider, atlas has the dimensions of a cylinder, 46m long, 25m in diameter, and sits in a cavern 100m below ground. A series of subdetectors surrounding the collision point stretch 20 meters 65. In detector section, an overview of the lhcb detector is given, together with a. Specs the serial protocol for the experiment control system. The lhcb detector university of oxford department of physics.
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