By Paolo Gandini

CP violation is a well-established phenomenon in particle physics, yet until eventually 2001 it used to be basically saw in kaons. within the final decade, numerous matter-antimatter asymmetries were saw in impartial B mesons in accordance with the expectancies of the traditional version of the susceptible interplay. Direct CP violation can be anticipated within the decay premiums of charged B+ mesons as opposed to that of B- mesons, notwithstanding the best results are found in a decay that happens simply two times in 10 million decays. Such rarity calls for large samples to check and this is often precisely what the LHC, and its devoted B-physics scan LHCb supply. This thesis offers an research of the 1st years of LHCb facts. the writer describes the 1st statement of the infrequent decay, B- → DK-, D → π-K+ and the 1st statement of direct CP violation during this B decay. The paintings constitutes crucial info at the experiment’s size of a basic parameter of the idea and stands as a benchmark opposed to which next analyses of this sort should be compared.

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Each drift-tube is filled with a mixture of Argon (70 %) and CO2 (30 %), with drift times below 50 ns. The layout of the Outer Tracker is shown in Fig. 14. 5 RICH Discrimination between charged hadrons is provided in the LHCb detector by two Ring Imaging CHerenkov detectors (RICH1 and RICH2) [12, 13]. Particle identification is particularly challenging at LHCb since mass discrimination is required over the broad momentum spectrum of the particle produced. RICH detectors use the light emitted by a charged track passing through a dielectric with a velocity v greater than the speed of light in that medium, the so-called Cherenkov effect [14].

1007/978-3-319-01029-8_2, © Springer International Publishing Switzerland 2014 25 26 2 The LHCb Experiment at the LHC Fig. 1 A schematic layout of the LHC. 3 T, depending on the energy of the beams. 5 TeV, providing collision at the total energy s = 7 TeV. This corresponds to half of the design energy, which will be reached after upgrading the machine in 2013. Beams are kept separate in the machine and they only cross in four interaction points (IP), where the main experimental detectors are situated: ATLAS [2] and CMS [3] are hosted in IP1 and IP5 respectively, LHCb [4] in IP8 and ALICE [5] in IP2.

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