Publications (18)
The ZEUS Forward Plug Calorimeter with Lead-Scintillator Plates and WLS Fiber Readout
A. Bamberger, S. Böttcher, I. Bohnet +31
A Forward Plug Calorimeter (FPC) for the ZEUS detector at HERA has been built as a shashlik lead-scintillator calorimeter with wave length shifter fiber readout. Before installatio…
Enhanced production of 60Fe in massive stars
A. Spyrou, D. Richman, A. Couture +23
Massive stars are a major source of chemical elements in the cosmos, ejecting freshly produced nuclei through winds and core-collapse supernova explosions into the interstellar med…
A resolution of the inclusive flavor-breaking sum rule puzzle
K. Maltman, R. J. Hudspith, R. Lewis +2
A combination of continuum and lattice methods is used to investigate systematic issues in the finite-energy-sum-rule determination of based on flavor-breaking combination…
A lattice investigation of exotic tetraquark channels
R. J. Hudspith, B. Colquhoun, A. Francis +2
We perform an lattice study of a number of channels where past claims exist in the literature for the existence of strong-interaction-stable light-heavy tetraquarks. We f…
Volume dependences from lattice chiral perturbation theory
B. Borasoy, R. Lewis
The physics of pions within a finite volume is explored using lattice regularized chiral perturbation theory. This regularization scheme permits a straightforward computational app…
The 21Na(p,gamma)22Mg Reaction and Oxygen-Neon Novae
S. Bishop, R. E. Azuma, L. Buchmann +25
The 21Na(p,gamma)22Mg reaction is expected to play an important role in the nucleosynthesis of 22Na in Oxygen-Neon novae. The decay of 22Na leads to the emission of a characteristi…
Lattice calculation of the leading strange quark-connected contribution to the muon
T. Blum, P. A. Boyle, L. Del Debbio +9
We present results for the leading hadronic contribution to the muon anomalous magnetic moment due to strange quark-connected vacuum polarisation effects. Simulations were performe…
Long distance regularization in chiral perturbation theory with decuplet
B. Borasoy, B. R. Holstein, R. Lewis +1
We investigate the use of long distance regularization in SU(3) baryon chiral perturbation theory with decuplet fields. The one-loop decuplet contributions to the octet baryon mass…
Particle decay branching ratios for states of astrophysical importance in 19Ne
D. W. Visser, J. A. Caggiano, R. Lewis +3
We have measured proton and alpha-particle branching ratios of excited states in 19Ne formed using the 19F(3He,t) reaction at a beam energy of 25 MeV. These ratios have a large imp…
Isospin mixing in the nucleon and 4He and the nucleon strange electric form factor
M. Viviani, R. Schiavilla, B. Kubis +5
In order to isolate the contribution of the nucleon strange electric form factor to the parity-violating asymmetry measured in 4He(\vec e,e')4He experiments, it is crucial to have…
Quark mass dependence of doubly heavy tetraquark binding
W. G. Parrott, B. Colquhoun, A. Francis +3
The existence of bound doubly heavy tetraquark states was confirmed by the recent LHCb discovery of the doubly charmed , less than 1 MeV below the meson pair threshold. Oth…
A resolution of the puzzle of low V_us values from inclusive flavor-breaking sum rule analyses of hadronic tau decay
R. J. Hudspith, R. Lewis, K. Maltman +2
Continuum and lattice methods are used to investigate systematic issues in the sum rule determination of using inclusive hadronic decay data. Results for emp…
Strange-quark Current in the Nucleon from Lattice QCD
R. Lewis, W. Wilcox, R. M. Woloshyn
The contribution of the strange-quark current to the electromagnetic form factors of the nucleon is studied using lattice QCD. The strange current matrix elements from our lattice…
Chiral corrections to the Roper mass
B. Borasoy, P. C. Bruns, U. -G. MeiÃner +1
We analyze the quark mass dependence of the Roper mass to one-loop order in relativistic baryon chiral perturbation theory. The loop integrals are evaluated using infrared regulari…
The Goldberger-Treiman Discrepancy in SU(3)
J. L. Goity, R. Lewis, M. Schvellinger +1
The Goldberger-Treiman discrepancy in SU(3) is analyzed in the framework of heavy baryon chiral perturbation theory (HBChPT). It is shown that the discrepancy at leading order is e…
-decay of V and its Role in Cooling Accreted Neutron Star Crusts
W. -J. Ong, E. F. Brown, J. Browne +20
The interpretation of observations of cooling neutron star crusts in quasi-persistent X-ray transients is affected by predictions of the strength of neutrino cooling via crust Urca…
Enhanced low-energy -decay strength of Ni and its robustness within the shell model
A. C. Larsen, J. E. Midtbø, M. Guttormsen +19
Neutron-capture reactions on very neutron-rich nuclei are essential for heavy-element nucleosynthesis through the rapid neutron-capture process, now shown to take place in neutron-…
Improved analysis of strong-interaction-stable doubly-bottom tetraquarks on the lattice
B. Colquhoun, A. Francis, R. J. Hudspith +3
We update earlier lattice results for the binding energies of the flavor antitriplet of strong-interaction-stable doubly bottom, tetraquarks, employing an extended sink c…