Lhcb is a bphysics experiment that is designed to perform highprecision measurements of cpviolation parameters and to measure rare b decays. The lhc is designed to produce 600 million collisions per second. One of its key detector components is the ringimaging cherenkov rich system. Hep detector description supporting the full experiment. Lhcb detector is a specialized detector for the study of bquark physics atlas. The frontend architecture chosen for lhcb 4, 5 has to a very large extent been determined by the requirement of making a hardwarebased short latency trigger, with an efficient event selection, for complicated b events. 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. Measurement of the forward z boson production cross. Protonproton collisions in each collision many many particles are produced. Lhcb, gaudi, framework, geometry, xml 1 introduction one category of data objects identi. Lhcb upgrade phase 1 upgrade all frontend detector electronics to 40 mhz readout by 2014, do not run in 20 nov 2012 mar 2014 with 12 months access run at 1x1033 until phase 2 shutdown increase hadron data sample by factor 10 reach detector design lumi of 20 fb1 except velo lhcb upgrade phase 2. 15300 250 mrad l lhcb 2x1032 cm2s1 maximal probability for a single ppinteractionbx 15 khz of bdecays in the acceptance search for new physics in cpviolation and rare decays.
A fast, lowpower, 6bit sar adc for readout of strip. To find them, the velos 42 silicon detector elements must be positioned perilously close to the point where protons collide, at a distance of just five millimetres. The detector itself is a manylayered instrument designed to detect some of the tiniest yet most energetic particles. The experiment is designed for precision measurements of cp violation and rare decays of beauty and charm hadrons. Welcome to the public pages of the lhcb velo project. In this paper the performance of the various lhcb subdetectors and the trigger system are described, using data taken from 2010 to 2012. The purpose of the lhcb is to search for evidence of antimatter. Lhcb is one of four large experiments at cerns large hadron collider. The lhcb experiment has been taking data at the large hadron collider lhc at cern since the end of 2009. A project of an asic for the readout of all silicon strip sensors in the lhcb upgrade tracker system, called salt. Di erent schemes are used to match and merge these samples. The track reconstruction uses hits in the velo, the tracker turicensis tt, which is located upstream of the.
The command git lbuse project sets the kerberos method, so anyone with access to their cern afs area should be. The mlm 28 sample has leadingorder accuracy for the emission of zero, one. To prevent damage from the lhc proton beams, which both possess the energy of a high speed train, the velo employs a novel design feature. Lhcb detector performance the universe,3 newsourcesofcp violationbeyondthesmareneeded. The application of silicon detectors close to the beam implies the isolation of the materials with. The experiment is designed for precision measurements of cpviolation and rare decays of beauty and charm hadrons. The lhcb large hadron collider beauty experiment is one of eight particle physics detector experiments collecting data at the large hadron collider at cern. Introduction 3 the lhcb experiment 1 is a single arm spectrometer designed to study heavy. Cern document server access articles, reports and multimedia content in hep.
This provides charged particle identification over a wide momentum range, from 2100 gevc. The vacuum system of the lhcb vertex detector sciencedirect. 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. The lhcb detector at the large hadron collider springerlink. It does this by searching for a particle called the beauty quark.
It is robust, protects against operator mistakes and can take automatic actions. Validation inspection of code naturally done in git on merge requests. Sissa medialab srl via bonomea, 265 346 trieste italy t. Performance of the lhcb tracking detectors mark tobin 2 1. The lhcb detector measures particle production in the. The charged particles are bent by a warm dipole magnet which has a. Unique coverage for n pdf atlarge x exploiting lhcb speci. Dirk wiedner early physics with the lhcb detector the k separation is achieved by two ring imaging cherenkov detectors. Detectorspecific monitoring lhcb software stack validation a whole suite of nightly tests for all software projects test of builds obviously. 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. A series of subdetectors surrounding the collision point stretch 20 meters 65.
The lhcb detector is a forward spectrometer at the large hadron collider lhc at cern. The operation and control, software, and online monitoring of the rich system. It is fully integrated in the lhcb experiment control system ecs and it is being used routinely for the operation of the rich detectors. Pdf lhcb reoptimized detector design and performance. Also include changes to use latest database tags in example options see merge request.
Timing and fast controls, data acquisition and experiment control system. Next is the large hadron collider beauty lhcb detector site. The lhcb detector is a singlearm spectrometer with good tracking and particle identification. An overview of the design of the vertex detector of the lhcb experiment in the future large hadron collider at cern will be given. The detector control system for the lhcb rich is an essential part that ensures the safe operation of the detectors. Neufeld, cern, geneva, switzerland abstract the aim of the lhcb con. The aim of the lhcb experiment is to record the decay of particles containing b and antib quarks, collectively known as b mesons. Detector safety system 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. Lhcb is a dedicated setup for bphysics studies at lhc ppcollisions at e cm14 tev inel. 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. However this luminosity was delivered in only 344 colliding bunches i. Muon detector frontend architecture lhcb muon group.
Abadie, cern, geneva, switzerland and samovargetint c. The lhcb detector 5 is a singlearm forward spectrometer covering the pseudorapidity range 2 detector includes a high. Use of commercial offtheshelf cots products and, wherever possible, commodity components and protocols. In this paper the performance of the various lhcb sub detectors and the trigger system are described, using data taken from 2010 to 2012.
The lhcb detector 39, 40 is a singlearm forward spectrometer covering the pseudorapidity range 2 maximal probability for a single ppinteractionbx 15 khz of bdecays in the acceptance search for new physics in cpviolation and rare decays. An emphasis is made on the performance study both using cosmic particles and with a test. Both the cp parameters and the branching ratios of the rare b decays are sensitive to physics beyond the standard model. 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.
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. 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. Precise measurements of b decays, close to the interaction point, requires the use of a special vertex detector, located in a secondary lhc. Matterantimatter asymmetry may interfere with the detection of neutrinos 25 may 2018 comparison of mechanisms of favored and unfavored fragmentation of quarks. The lhcb experiment is situated at one of the four points around cerns large hadron collider where beams of protons are smashed together, producing an array of different particles how does it work. B u 40%, b d40%, b s10%, b c and bbaryons 10% omany tracks available for primary vertex many particles not associated to b hadrons b hadrons are not coherent. Introduction the main task of the lhcb muon detector is to provide the whole information for the l0p. Lhcb velo detector people want to see detector elements fully functional description of parts of the detector long term valid stuff structure short lived quantities temperature, alignment, a natural aggregation would be similar to. General architecture of the lhcb online system with its three major components. The atlas detector weighs 7,000 tonnes, similar to the weight of the eiffel tower. Dzhelyadin, on behalf of the lhcb collaboration cern, geneva, switzerland and ihep, protvino, russia available online 6 august 2007 abstract the calorimeter detectors constructed for the lhcb experiment are being described.