2 research outputs found
Charge collection properties of prototype sensors for the LHCb VELO upgrade
No full textAn extensive sensor testing campaign is presented, dedicated to measuring the charge collection properties of prototype candidates for the Vertex Locator (VELO) detector for the upgraded LHCb experiment. The charge collection is measured with sensors exposed to fluences of up to 8×1015 1 MeV neq cm-2, as well as with nonirradiated prototypes. The results are discussed, including the influence of different levels of irradiation and bias voltage on the charge collection properties. Charge multiplication is observed on some sensors that were nonuniformly irradiated with 24 GeV protons, to the highest fluence levels. An analysis of the charge collection near the guard ring region is also presented, revealing significant differences between the sensor prototypes. All tested sensor variants succeed in collecting the minimum required charge of 6000 electrons after the exposure to the maximum fluence.An extensive sensor testing campaign is presented, dedicated to measuring the charge collection properties of prototype candidates for the Vertex Locator (VELO) detector for the upgraded LHCb experiment. The charge collection is measured with sensors exposed to fluences of up to , as well as with nonirradiated prototypes. The results are discussed, including the influence of different levels of irradiation and bias voltage on the charge collection properties. Charge multiplication is observed on some sensors that were nonuniformly irradiated with 24 GeV protons, to the highest fluence levels. An analysis of the charge collection near the guard ring region is also presented, revealing significant differences between the sensor prototypes. All tested sensor variants succeed in collecting the minimum required charge of 6000 electrons after the exposure to the maximum fluence
Measurement of using the decay mode
No full textUsing a proton–proton collision data sample collected by the LHCb detector and corresponding to an integrated luminosity of , the lifetime of the light mass eigenstate, , is measured using the decay mode to be A combination of this result with a previous LHCb analysis using an independent dataset corresponding to 3 fb of integrated luminosity gives where the first uncertainty is statistical, the second due to the uncorrelated part of the systematic uncertainty and the third due to the correlated part of the systematic uncertainty.Using a proton-proton collision data sample collected by the LHCb detector and corresponding to an integrated luminosity of 5.7 , the lifetime of the mass eigenstate, , is measured using decay mode to be = 1.445 0.016(stat) 0.008(syst) ps. A combination of this result with a previous LHCb analysis using an independent dataset corresponding to 3 of integrated luminosity gives = 1.452 0.014 0.007 0.002 ps, where the first uncertainty is statistical, the second due to the uncorrelated part of the systematic uncertainty and the third due to the correlated part of the systematic uncertainty
