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Showing 1 to 13 of 13 for “"bottom quark"”.
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Simulation of measuring bottom quark flow in heavy ion collisions using the CMS detector
… study to characterize the measurement of bottom quark flow in relativistic Pb+Pb collisions using the Compact Muon Solenoid experiment. The Hydjet event generator is used to produce sample collision events at four centrality values between 0 and 12 fm. These events are processed using the …
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Collinear divergences and factorization in perturbative QCD
… scheme is implemented on Higgs production by bottom quark fusion, and then extended to Higgs production by gluon fusion. After this the issue of gauge invariance in this collinear scheme is addressed and it is realized that the collinear scheme fails to be gauge invariant. A more general …
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Measurement of the single top quark cross section in the lepton plus jets final state in proton-antiproton collisions at a center of mass energy of 1.96 TeV using the CDF II detector.
We present a measurement of the single top quark cross section in the lepton plus jets final state using an integrated luminosity corresponding to 7.5/fb of collision data collected by the Collider Detector at Fermilab. The single top candidate events are identified by the signature of a charged …
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Collinear singularities and the factorization scale in perturbative QCD
… First, we argue in favor of the use of a bottom-quark distribution function, which sums collinear logarithms, in the calculation of the cross section for Higgs-boson production in association with bottom quarks. As a testing ground for Higgs searches, we propose a measurement of Z-boson …
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Electron reconstruction in simulated Pb+Pb events in CMS
… LHC ring. The LHCb detector is aimed to study bottom quark physics, which will allow a measurement of the parameters of CP violation in bottom quark productions. The ALICE experiment is specialized in Pb+Pb heavy ion collisions. The ATLAS [3] detector is a general purpose detector, and it will …
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Third-order QCD corrections to heavy quark pair production near threshold
The measurement of the top quark mass is an important task at the future International Linear Collider. The most promising process is the top quark pair production in the threshold region. In this region the top quarks behave non-relativistically and a perturbative treatment using effective field …
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Weak decays of beautiful pseudoscalar mesons with Lattice Quantum Chromodynamics
… associated with the large mass of valence $b$ quarks to study a selection of decays of $B$ mesons with Lattice Quantum Chromodynamics. After introducing these modern methods, I report on my progress on calculating the vector current form factors for $B_c \to D_s$. This decay is allowed at the …
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Theoretical and experimental approaches to the dark energy and the cosmological constant problem.
… regions defined with jet multiplicity, tagged bottom quark jet multiplicity, missing transverse momentum, and the scalar sum of jet transverse momenta. The observed numbers of events in all search regions are found to be consistent with the expectations from standard model processes. Exclusion …
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Thomas Fermi model for mesons and new noise subtraction techniques in lattice QCD.
Lattice QCD calculations of quark loop operators are extremely time-consuming to evaluate. To calculate these diagrams we use stochastic noise methods, which employ a randomly generated set of noise vectors to project out physical signals. This is done with linear equation solvers like GMRES-DR …
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Precision Measurements of the Vector Boson Scattering Production and Searches for Charged Higgs Bosons at the Large Hadron Collider
… (H superscript ±) decaying into a top and a bottom quark. The data samples used for the measurements are LHC proton-proton collisions recorded with the CMS detector during 2016–2018 at √𝑠 = 13TeV, corresponding to an integrated luminosity of 137 fb⁻¹. The measurements are performed in the …
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Bottomonium Spectroscopy at Belle: Studies of Radiative and Hadronic Transitions
The large constituent quark mass of bottomonium, the bottom quark/anti-quark bound state $(bbbar)$, affords a rich spectroscopy in which the perturbative (non-relativistic) limit of Quantum Chromodynamics may be theoretically described and experimentally investigated. The radial excitations of …
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Heavy quark interaction in Hot QCD matter: open charm and bottom production in relativistic Heavy-Ion Collisions
… Model. The basic constituents of QCD are quarks and gluons that are confined in hadronic matter: at high temperatures and/or densities quark deconfinement occurs and hadronic matter undergoes a phase transition into a new state of matter, the Quark-Gluon Plasma (QGP). Numerical solutions …
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SHEDDING LIGHT ON HIGGS BOSON SELF-INTERACTIONS IN THE BBƔƔ CHANNEL. PHOTON AND B-JET CALIBRATIONS, AND SEARCHES FOR HIGGS BOSON PAIRS WITH THE ATLAS EXPERIMENT.
… in the final state with two photons and two bottom quarks (bbγγ). The first analysis is a search for SM Higgs boson pairs (HH) in the bbγγ final state. No excess of events with respect to the SM background is observed. An observed upper limit of μHH < 4.0 is set at 95% confidence level (CL) …