30,654 research outputs found
Associated Charmonium Production in p-pbar Annihilation
In this paper we summarize our recent results for low energy associated
charmonium production cross sections, using 1) crossing symmetry, and 2) an
explicit hadronic model. These predictions are of relevance to the planned
charmonium and charmonium hybrid production experiment PANDA at GSI.Comment: 5 pages, 5 figures. Contribution to the Second Meeting of the APS
Topical Group on Hadron Physics GHP2006. (Nashville, TN, 22-24 Oct. 2006
Heavy Quarkonium Dissociation Cross Sections in Relativistic Heavy-Ion Collisions
Many of the hadron-hadron cross sections required for the study of the
dynamics of matter produced in relativistic heavy-ion collisions can be
calculated using the quark-interchange model. Here we evaluate the low-energy
dissociation cross sections of , , , , and
in collision with , , and , which are important for
the interpretation of heavy-quarkonium suppression as a signature for the quark
gluon plasma. These comover dissociation processes also contribute to
heavy-quarkonium suppression, and must be understood and incorporated in
simulations of heavy-ion collisions before QGP formation can be established
through this signature.Comment: 38 pages, in LaTe
Screening of charged impurities with multi-electron singlet-triplet spin qubits in quantum dots
Charged impurities in semiconductor quantum dots comprise one of the main
obstacles to achieving scalable fabrication and manipulation of singlet-triplet
spin qubits. We theoretically show that using dots that contain several
electrons each can help to overcome this problem through the screening of the
rough and noisy impurity potential by the excess electrons. We demonstrate how
the desired screening properties turn on as the number of electrons is
increased, and we characterize the properties of a double quantum dot
singlet-triplet qubit for small odd numbers of electrons per dot. We show that
the sensitivity of the multi-electron qubit to charge noise may be an order of
magnitude smaller than that of the two-electron qubit.Comment: 17 pages, 11 figures; typos corrected, minor revision
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