Abstract
The cross section for ep -> e b\bar{b} X in photoproduction is measured with the H1 detector at the ep-collider HERA. The decay channel b\bar{b} -> ee X' is selected by identifying the semi-electronic decays of the b-quarks. The total production cross section is measured in the kinematic range given by the photon virtuality Q^2 <= 1 GeV^2, the inelasticity 0.05 <= y <= 0.65 and the pseudorapidity of the b-quarks |eta(b)|,|eta(\bar{b})| <= 2. The differential production cross section is measured as a function of the average transverse momentum of the beauty quarks <P_T(b)> down to the threshold. The results are compared to next-to-leading-order QCD predictions.
Highlights
Of special importance is the third trigger level integrated in the Fast Track Trigger (FTT) [60], which identifies low energy electrons (E > 1 GeV) [61, 62] by combining FTT tracks with energy depositions reconstructed in the liquid argon (LAr) calorimeter by the Jet Trigger (JT) [63]
The prediction has a tendency to be below the data, a trend observed in previous beauty cross section measurements at large transverse beauty momenta
The inclusive and differential cross section of beauty photoproduction was measured in the di-electron final state, using the H1 detector at the HERA collider
Summary
This process is referred to as direct or pointlike and can be calculated using perturbative mSupported by the UK Science and Technology Facilities Council, and formerly by the UK Particle Physics and Astronomy Research Council. Lower values of the transverse momentum of the b-quarks become accessible by the use of lepton tags without requiring jets, where the minimum PT (b) value is determined by the minimum transverse momentum cut on the lepton For muons this cut is typically at PT (μ) ≈ 2 GeV, and too high to measure efficiently the production cross sections of b-quarks near threshold. This low cut on the transverse electron momentum, PT (e), improves the total acceptance and makes the low PT (b) phase space experimentally accessible
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