First observation of the Charmless Decay B to K pi0pi0 and Study of its Dalitz Plot Structure Page: 60 of 201
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2.5. The Detector of Internally Reflected Cerenkov Light (DIRC)
I -
1 04 --
K-
1@--j 1 10
Momentum (GeV/c)
Figure 2.7: Measurement of the average dE/dx as a function of track
momenta from the DCH. The curves superimposed to the data show the
Bethe-Bloch predictions for energy loss of a sample of particles of different
masses /48.
2.5 The Detector of Internally Reflected Cerenkov
Light (DIRC)
Kaon and pion separation is essential for reconstructing B decays, like B+ - K+ rr
and for tagging particle flavour. The lab frame momenta can range between 1.7 GeV/c
and 4.2 GeV/c with strong momentum-polar angle correlations, hence the DIRC is
designed to provide particle identification (PID) and ir/K separation of at least 4-
for all tracks from the pion Cherenkov threshold up to 4.2 GeV/c. Its principle
is based on the magnitudes of angles being preserved after reflection upon a flat
surface. The variable Qc represents the Cherenkov angle and is calculated from the
following relation:
c
cos c =- (2.1)
nv
where v is the velocity of the particle, c the speed of light and n the refractive index
of fused silica.31
31
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Puccio, Eugenia Maria Teresa Irene & /SLAC, /Warwick U. First observation of the Charmless Decay B to K pi0pi0 and Study of its Dalitz Plot Structure, thesis or dissertation, March 21, 2012; United States. (https://digital.library.unt.edu/ark:/67531/metadc830373/m1/60/?q=%22Irene%22: accessed June 1, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.