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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Experimentelle Elementarteilchenphysik

Alexandre Somov (2002)

Hard proton nucleus interactions and production of heavy flavours at HERA-B

Dissertation, Humboldt Universität zu Berlin.

 A rst attempt to measure the cross section of inclusive production of 0 mesons
decaying into two photons using the HERA-B detector in the spring of '99 con g-
uration is presented. The 0 cross section is determined using data from the inner
part of the electromagnetic calorimeter for two types of target material, carbon and
titanium, in the transverse momentum range of 2:75 < pT < 5:0 GeV/c and the
center of mass rapidity range of 0:05 < yC:M: < 0:55. From the data on C and Ti
the nuclear dependence of 0 production, parameterized as A , was extracted.
    Various approaches for the luminosity determination at HERA-B are investi-
gated. The average number of interactions in the target can be determined from the
energy deposition in the electromagnetic calorimeter. This method provides a high
accuracy in the luminosity determination.
    The feasibility to study hadronic production of dileptons in the high-mass region
at HERA-B is investigated with a Monte Carlo simulation. The predicted mass
resolution will allow the clear observation of the mass peak above the background,
and to separate the (1S ) and (2S ) states.
    The possibility to perform an accurate measurement of polarization is demon-
strated. This measurement provides an excellent opportunity to test di erent mech-
anisms of heavy quarkonium production.
mpt to measure the cross section of inclusive production of 0 mesons
decaying into two photons using the HERA-B detector in the spring of '99 con g-
uration is presented. The 0 cross section is determined using data from the inner
part of the electromagnetic calorimeter for two types of target material, carbon and
titanium, in the transverse momentum range of 2:75 < pT < 5:0 GeV/c and the
center of mass rapidity range of 0:05 < yC:M: < 0:55. From the data on C and Ti
the nuclear dependence of 0 production, parameterized as A , was extracted.
    Various approaches for the luminosity determination at HERA-B are investi-
gated. The average number of interactions in the target can be determined from the
energy deposition in the electromagnetic calorimeter. This method provides a high
accuracy in the luminosity determination.
    The feasibility to study hadronic production of dileptons in the high-mass region
at HERA-B is investigated with a Monte Carlo simulation. The predicted mass
resolution will allow the clear observation of the mass peak above the background,
and to separate the (1S ) and (2S ) states.
    The possibility to perform an accurate measurement of polarization is demon-
strated. This measurement provides an excellent opportunity to test di erent mech-
anisms of heavy quarkonium production.