estimation of the barrel tof response a.galoyan, j. ritman, v. uzhinsky

Estimation of the Barrel TOF ResponseA.Galoyan, J. Ritman, V. Uzhinsky

Used modelUsed modelrrdd=48 cm=48 cm

2222oo< < θ <140θ <140oo B=2 TB=2 T

L.D.Landau, E.M.Lifshitz, “Field theory”, 1962L.D.Landau, E.M.Lifshitz, “Field theory”, 1962

SeparationSeparation (standard deviations) (standard deviations)

Separation power at various angles

Fast simulation of Tof response

Knowing time-of-flight, momentum and emission angle, we calculate the particle energy and squared mass.

This algorithm is included inThis algorithm is included in FastSimApp of Babar-Panda FastSimApp of Babar-Panda framework. framework.

3 %

Squared mass resolution of Squared mass resolution of ππ, , KK, P, P

SingleSingle generatorgenerator

Single generatorSingle generator

Single generatorSingle generator

Charged particle distributions on Charged particle distributions on M2M2 from Tof and from Tof and dE/dxdE/dx from tracking detectors from tracking detectors

Characteristics of charged particles generated by Characteristics of charged particles generated by DPM at Plab=1.5 GeV/c at dE/dx (MVD) > 4.5 (a.u.) DPM at Plab=1.5 GeV/c at dE/dx (MVD) > 4.5 (a.u.)

Possibility ofPossibility of selection of K-mesons at various selection of K-mesons at various restrictions restrictions on dE/dX and 0.1<Mon dE/dX and 0.1<M22(Tof)<0.4(Tof)<0.4

ConclusionConclusion

1.1. The formulas for time of light calculations have been obtainedThe formulas for time of light calculations have been obtainedassuming barrel assuming barrel ToFToF geometry and constant magnetic field. geometry and constant magnetic field.

2.2. Separation power (Separation power (s.ps.p.) of barrel .) of barrel ToFToF in dependence on momentum in dependence on momentumis calculated at various emission angles of particles. It is shown, is calculated at various emission angles of particles. It is shown, maximal momentum maximal momentum for particle identification for particle identification corresponding tocorresponding to s.p. >= 3 s.p. >= 3 depends on emission angles.depends on emission angles.

3. Algorithm of simulation of 3. Algorithm of simulation of ToFToF response is implemented in FastSim response is implemented in FastSimpackage of Panda-Babar. Corresponding simulations using package of Panda-Babar. Corresponding simulations using DPM model event generator showed that combined informationDPM model event generator showed that combined informationofof M M22 from barrel from barrel ToFToF and and dE/dxdE/dx from tracking detector (TPC or STT) allow from tracking detector (TPC or STT) allow to reach good separation of slow protons, Π-, K- mesons. to reach good separation of slow protons, Π-, K- mesons.