The effort at the UB and CNM to study the feasibility of using standard CMOS technology Geiger avalanche photo-diodes (GAPDs) for pixel tracking detectors is reported. Generally APDs are used as ...photon detector devices. The possibility of using APDs in Geiger mode (that is reverse-biased above breakdown) for direct particle detection is the purpose of the ongoing R&D program, which tries to exploit GAPDs’ features suitable for particle detection.
Pulseshape simulations for the SPD subdetector of LHCb Aguiló, E.; Calvo, M.; Deschamps, O. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
2006, 2006-1-00, Volume:
556, Issue:
1
Journal Article
Peer reviewed
A Monte Carlo simulation to study the signal temporal shape of the LHCb Scintillator Pad Detector (SPD) and the Preshower (PRS) subdetectors is presented. Being a full simulation too slow to tune the ...free parameters related to some unknown properties of the detector, a fast Monte Carlo simulation is introduced. The pulseshape information is needed for the LHCb experiment general Monte Carlo simulation (Gauss) and it is extracted from this fast simulation. The approach presented here can be easily extended and used over similar geometrical configurations.
We study the processes (ProQuest: Formulae and/or non-USASCII text omitted) using a data sample of 519fb super(-1) recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e ...super(+)e super(-) collider at center-of-mass energies at and near the Upsilon(nS) (n=2, 3, 4) resonances. We observe eta super(c) decays to both final states and perform Dalitz plot analyses using a model-independent partial wave analysis technique. This allows a model-independent measurement of the mass-dependence of the I=1/2 KpiS-wave amplitude and phase. A comparison between the present measurement and those from previous experiments indicates similar behavior for the phase up to a mass of 1.5GeV/c super(2). In contrast, the amplitudes show very marked differences. The data require the presence of a new a0(1950) resonance with parameters m=1931+ or -14+ or -22MeV/c super(2) and Gamma=271+ or -22+ or -29MeV.
Using the eight time dependences e? super(Gammat)(1+C sub()icosDeltamt+S sub() isinDeltamt) for the decays Upsilon(4S)arrowrightB super(0)B super(0)arrowrightf sub(@)jfdk with the decay into a ...flavor-specific state f sub()jscriptl super(+ or -)X before or after the decay into a CP eigenstate f sub()kccK sub()S,Las measured by the BABAR experiment, we determine the three CPT-sensitive parameters Re(z) and Im(z) in B super(0)?B super(0) mixing and A/A in B super(0)arrowrightc cK super(0) decays. We find Im(z)=0.010+ or -0.030+ or -0.013, Re(z)=?0.065+ or -0.028+ or -0.014, and A/A=0.999+ or -0.023+ or -0.017, in agreement with CPT symmetry.
We perform the first measurement on the D super(0)- super( D) super(0) mixing parameters using a time-dependent amplitude analysis of the decay D super(0)arrowrightpi super(+)pi super(-)pi super(0). ...The data were recorded with the BABAR detector at center-of-mass energies at and near the Upsilon(4S) resonance, and correspond to an integrated luminosity of approximately 468.1fb super(-1). The neutral D meson candidates are selected from D*(2010) super(+)arrowrightD super(0)pi super(+) sdecays where the flavor at the production is identified by the charge of the low-momentum pion, pi sub()s super(+) The measured mixing parameters are x=(1.5+ or -1.2+ or -0.6)% and y=(0.2+ or -0.9+ or -0.5)%, where the quoted uncertainties are statistical and systematic, respectively.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted)We measure the time-dependent CP asymmetry in the radiative-penguin decay B super(0) arrowright ..., using a sample of 471x10 ...super(6)Upsilon(4S) arrowright BB events recorded with the BABAR detector at the PEP-II e super(+)e super(-) storage ring at SLAC. Using events with m sub()Kpipi1.8GeV/c super(2), we measure the branching fractions of B super(+) arrowright K super(+)pi super(-)pi super(+)gamma and B super(0) arrowright K super(0)pi super(-)pi super(+)gamma, the branching fractions of the kaonic resonances decaying to K super(+)pi super(-)pi super(+), as well as the overall branching fractions of the B super(+) arrowright rho super(0)K super(+)gamma, B super(+) arrowright K* super(0)pi super(+)gamma and S-wave B super(+) arrowright ... components. For events from the rho mass band, we measure the CP-violating parameters ... and ..., where the first uncertainties are statistical and the second are systematic. We extract from this measurement the time-dependent CP asymmetry related to the CP eigenstate ... and obtain ..., which provides information on the photon polarization in the underlying bsgamma transition.
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