Angular Correlations in Beauty Production at the Tevatron at √s PDF Download
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Author: Daniel Abraham Wijngaarden
Publisher:
ISBN: 9789090195032
Category :
Languages : en
Pages : 178
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Author: Daniel Abraham Wijngaarden
Publisher:
ISBN: 9789090195032
Category :
Languages : en
Pages : 178
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 413
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 187
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Measurements of the b quark production cross section at the Tevatron and at Hera in the final decades of the 20th century have consistently yielded higher values than predicted by Next-to-Leading Order (NLO) QCD. This discrepancy has led to a large efforts by theorists to improve theoretical calculations of the cross sections and simulations of b quark production. As a result, the difference between theory and experiment has been much reduced. New measurements are needed to test the developments in the calculations and in event simulation. In this thesis, a measurement of angular correlations between b jets produced in the same event is presented. The angular separation between two b jets is directly sensitive to higher order contributions. In addition, the measurement does not depend strongly on fragmentation models or on the experimental luminosity and efficiency, which lead to a large uncertainty in measurements of the inclusive cross section. At the Tevatron, b$\bar{b}$ quark pairs are predominantly produced through the strong interaction. In leading order QCD, the b quarks are produced back to back in phase space. Next-to-leading order contributions involving a third particle in the final state allow production of b pairs that are very close together in phase space. The Leading Order and NLO contributions can be separated into three different processes: flavour creation, gluon splitting and flavour excitation. While the separation based on Feynman diagrams is ambiguous and the three processes are not each separately gauge invariant in NLO QCD, the distinction can be made explicitly in terms of event generators using LO matrix elements. Direct production of a b{bar b} quark pair in the hard scatter interaction is known as flavour creation. The quarks emerge nearly back to back in azimuth. In gluon splitting processes, a gluon is produced in the hard scatter interaction. The gluon subsequently splits into a b$\bar{b}$ quark pair. The quarks are very close in phase space. The flavour excitation process can be interpreted as production of a b{bar b} quark pair before the hard scatter interaction. One of the b quarks interacts with a particle from the other beam hadron and emerges with high pT. The other quark stays close to the beam axis but may still be recorded by the detector. The azimuthal correlation between the b quarks is weak. In leading order event generators, the gluon splitting and flavour excitation processes are simulated by final- and initial state showering. The b quarks produced in the proton-antiproton collisions at the Tevatron are detected through the signature of their decay products in the D0 detector. The particles associated with the production and decay of a b hadron are reconstructed as a jet in the calorimeter. These b jets are distinguished from light flavour background using two methods. The first method is based on the association of a muon with the jet. In about 20% of b hadron decays, a muon is created. Due to the large mass of the b hadron, this muon will have large transverse momentum with respect to the flight axis of the b hadron. This relative transverse momentum or P$Rel\atop{T}$ is approximated by the P$Rel\atop{T}$ of the muon with respect to the jet axis. The fraction of b jets in a muon plus jet sample can be determined by fitting the P$Rel\atop{T}$ distributions for b jets and background jets determined from Monte Carlo to the data distribution. The second method uses the relatively long lifetime of b hadrons. The tracks of the decay products of the b hadron do not point back to the production point but to the decay point of the hadron, which is displaced from the primary vertex by an average of c?? ̃0.5? mm. Combined with the large mass of the hadron, this means the tracks are also displaced from the production point. By comparing the distance of shortest approach of each track to the distribution for background tracks, the probability that each track comes from a back...
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Author:
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ISBN:
Category :
Languages : en
Pages :
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We report a number of results on beauty production from the D[null] experiment at the Fermilab Tevatron Collider operating at[radical]s= 1.8 TeV. Measurements of the[ital b][ital[anti b]] production cross section using single muon, muon plus jet and dimuon plus jet triggers, in the data collected in 1992-93, are presented. A preliminary measurement of the[ital b][ital[anti b]] angular correlations using the dimuon data sample is also presented. We find that the[ital b]-quark production cross section for[vert-bar][ital Y][sup b][vert-bar][lt] 1.0 and[ital p][sub T][sup b][gt] 8 GeV/c is systematically higher than, although consistent within errors with, the next-to-leading order (NLO) QCD predictions. A similar comparison with QCD is observed in the[ital b][ital[anti b]] ([mu][mu]) angular correlations, where the shape of the distribution indicates a sizable contribution fro the NLO process.
Author: D Bisello
Publisher: World Scientific
ISBN: 9814547026
Category :
Languages : en
Pages : 814
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Book Description
The proceedings of this series of annual symposia represent an extensive summary of the experimental and theoretical status of high energy physics at hadron colliders. This volume discusses the latest results on top and beauty physics, QCD, electroweak physics and searches for new particles. The prospects of this field for LHC, Tevatron and Hera machines are also reported.
Author: Brian Moser
Publisher: Springer Nature
ISBN: 3031394429
Category : Science
Languages : en
Pages : 250
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Precision measurements of the Higgs boson’s properties are a powerful tool to look for deviations from the predictions of the Standard Model (SM) of particle physics. The 139/fb of proton-proton collision data which have been collected by the ATLAS experiment during Run 2 of the LHC, offer an opportunity to investigate rare Higgs-boson topologies, which are particularly sensitive to new physics scenarios but experimentally difficult to access. Several such measurements, which target Higgs-boson decays to heavy-flavour quarks, as well as their combinations are presented in this thesis. A novel analysis that measures Higgs-boson production in association with a heavy vector boson V (VH, with V=W,Z) at high energies is presented. Dedicated Higgs-boson reconstruction techniques are applied to reconstruct the highly Lorentz-boosted Higgs-boson decays into pairs of bottom quarks. The measurement is subsequently combined with a VH cross-section measurement at low and intermediate pT(V) to provide a differential cross-section measurement in kinematic fiducial volumes over the largest possible pT(V) range. All cross-section measurements agree with the SM predictions within relative uncertainties that range from 30% to 300%. The results are furthermore interpreted as limits on the parameters of a SM effective field theory. Finally, a combination of measurements of Higgs decays to heavy-flavour quarks is used to experimentally determine that the Higgs-boson coupling to charm quarks is weaker than to bottom quarks, as predicted by the SM. The target audience for the thesis are physicists and physics students, in particular those with a background in high energy physics.
Author:
Publisher:
ISBN:
Category : Nuclear physics
Languages : en
Pages : 1642
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Author: Calvin S. Kalman
Publisher:
ISBN:
Category : Baryons
Languages : en
Pages : 424
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Author:
Publisher: World Scientific
ISBN: 981447651X
Category :
Languages : en
Pages : 81
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 426
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