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Showing 1 to 15 of 15 for “"Quarkonium"”.
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Exotic States in Quarkonium Physics: Effective Theories of Heavy Mesonic Molecules and an AdS/QCD Model of Hybrid Quarkonium
… dualities to study the physics of ex-</p><p>otic quarkonium states, that is bound states containing a heavy quark-antiquark pair</p><p>which nevertheless cannot be be understood working only with the standard quark</p><p>model of hadrons. Candidates for such states, long speculated to exist, have …
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Supersymmetric jets from Z boson decay and radiative decays of heavy quarkonium
… thesis, we examine two-body radiative decays of quarkonium states [equation] in order to study the effects of the spin of the ~ on decay widths; stands for any elementary particle or resonance. Using effective couplings in a calculation which goes beyond the Wilczek aproximation, we find that in …
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Quarkonium Suppression in pPb Collisions at CMS and Timing Detectors for Future Collider Experiment
… smaller systems such as pp and pPb collisions. Quarkonium, bound states of heavy quark–antiquark pairs, provide sensitive probes in this context because their survival strongly depends on binding energy and the surrounding medium. The excited-to-ground state charmonium cross-section ratio, …
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Measurement of the Upsilon(nS) cross section at CDF
… trying to explain the production mechanism for quarkonium to learn more about this system. Several different theories try to describe quarkonium production, and while these theories agree with experimental measurements of production rates, theoretical predictions for quarkonium polarization …
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Development of the Readout Chamber of the ALICE Transition Radiation Detector and Evaluation of its Physics Performance in the Quarkonium Sector
… detector physics performance was studied in the Quarkonium sector. The pion rejection was considered with and without a TRD contribution. It was found that only with the TRD it will be possible to detect the Quarkonium resonances significantly. The significance of the recorded signal is at the …
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Emergence, Formation and Dynamics of Hot QCD Matter
… landscape of hot QCD physics. The first one is quarkonium transport inside quark-gluon plasma (QGP), the high temperature phase of QCD. Over the past two decades it has been realized that a significant fraction of quarkonium suppression in high energy heavy ion collisions comes from dynamic …
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Measurement Of Branching Fractions Of Rare Semi-Leptonic Ds Decays Ds → π0 L ν, Ds →ρ L ν, Ds →ks L ν (near ϒ (4s), ϒ (5s)) At Belle
… are a quark and an anti-quark is known as quarkonium. Mesons which are formed by a bound state of charm quark and anti-charm quark are known as charmonium states. Different inspections of exotic charmonium states have been understood as 4-quark states. Charmonium states are produced via …
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UNRAVELING THE NUCLEON 3D STRUCTURE FROM EXPERIMENT, LATTICE, AND GLOBAL ANALYSIS
… near threshold photoproduction of heavy vector quarkonium off the proton. We show that the production amplitude can be factorized in terms of gluonic GPDs and the quarkonium distribution amplitude, similar to the high-energy limit. At the threshold, the threshold kinematics has a large skewness …
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Exclusive Production of Quarkonia and Generalized Parton Distributions
… ρ0 production to test our variants for Eg. For quarkonium production, the analytic calculation of the Leading Order production amplitudes was performed, verifying results published previously, in particular confirming that in the non-relativistic collinear approximation there is no access to the …
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Performance of a photon conversion trigger in proton-proton collisions using the ALICE Transition Radiation Detector
… find a corresponding TRD track in MC; iii) HQU (Quarkonium) trigger cuts had varying relative efficiency for conversion photons between data sets; iv) the deflections of TRD tracklets differed by about 0.176 mm. Discrepancy ii) can be halved by limiting pile-up photons. Charged particles with pT …
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Higgs Effects in Neutrino Physics and Heavy Quark Systems
… Therefore, we study the decay channel of the quarkonium η b → τ+ τ– to search for the existance of an additional Higgs field or a new gauge boson. We estimate the standard model branching ratio for this decay to be ∼ 4 × 10 –9. We show that considerably larger branching ratios, up to the …
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Probes of strongly interacting plasma
… correction to the screening length of the heavy quarkonium color potential. Finally, we discuss the strong magnetic field limit to the leading order in the weak medium/probe coupling. It is shown that the drag force is suppressed along the magnetic field and in the exact chiral limit tends to …
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Observation of upsilon suppression, search for long-lived particles, and observation of B0s → micro + micro-- at the LHC with the CMS experiment
… heavy-ion collisions. The full spectroscopy of quarkonium states has been proposed as a possible thermometer for the QGP. The measurement reported in Chapter 3 is performed with data recorded by CMS during the first PbPb run at 2010 and the proton-proton <em>(pp)</em> run at 2011, both at sqrt …
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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 …