arXiv subjects

Jim Napolitano

Publications and source records attributed to Jim Napolitano.

4 recordsLinked to original sources

arXiv2015

Waterproofed Photomultiplier Tube Assemblies for the Daya Bay Reactor Neutrino Experiment

In the Daya Bay Reactor Neutrino Experiment 960 20-cm-diameter waterproof photomultiplier tubes are used to instrument three water pools as Cherenkov detectors for detecting cosmic-ray muons. Of these 960 photomultiplier tubes, 341 are recycled from the MACRO experiment. A systematic program was undertaken to refurbish them as waterproof assemblies. In the context of passing the water leakage check, a success rate better than 97% was achieved. Details of the design, fabrication, testing, operation, and performance of these waterproofed photomultiplier-tube assemblies are presented.

physics.ins-det↗

arXiv2006

The Physics of Charm: Recent Experimental Results

We review the most recent results from experiments studying systems containing charmed quarks. The selection reflects the presenter's bias, and there is an emphasis on decays of open charm. We discuss precision measurements of various sorts, various new states in the charmonium system, measurements aimed at testing Lattice QCD, and the latest searches for charm mixing. We conclude with a discussion of upcoming experiments at existing and future facilities.

hep-ex↗

arXiv2004

Charm and QCD at Cleo-III and Cleo-c

We present recent results on charm physics from CLEO-III, emphasizing QCD and hadronic structure. These include the decay $Ξ_c^0\to pK^-K^-π^+$ and the form factor for $D^0\toπ^-e^+ν_e$. We also discuss upcoming measurements with CLEO-c, including dramatic improvements in the $D^0\toπ^-e^+ν_e$ form factor, and glueball spectroscopy in $J/ψ\toγX$.

hep-ex↗

arXiv1998

Light Meson Spectroscopy

We survey the current status of light meson spectroscopy. We begin with a general introduction to meson spectroscopy and and its importance in understanding the physical states of Quantum Chromo Dynamics (QCD). Phemenological models of hadron spectroscopy are described with particular emphasis on the constituent quark model and the qualitative features it predicts for the meson spectrum. We next discuss expectations for hadrons lying outside the quark model, such as hadron states with excited gluonic degrees of freedom. These states include so-called hybrids glueballs}, as well as multiquark states. The established meson states are compared to the quark model predictions and we find that most meson states are well described by the quark model. However, a number of states in the light-quark sector do not fit in well, suggesting the existence of hadronic states with additional degrees of freedom. We end with a brief description of future directions in meson spectroscopy.

hep-ph↗