Golowich, Eugene
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Professor Emeritus, Department of Physics
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Golowich
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Eugene
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Physics
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Publication Open Access Unbinding the Deuteron(2008-01) Golowich, EugeneWe consider a description of the deuteron based on meson exchange potentials. A key feature is the inclusion of the I=S=0 two-pion intermediate state ('sigma(600)') as a significant component of the inter-nucleon potential energy. In this approach, deuteron binding is seen to be predominantly a consequence of sigma(600) and omega(783) exchange, with a secondary tole played by rho(770). We explore sensitivity of two-nucleon binding to changes in the potential and thereby obtain an anthropic constraint -- that the deuteron unbinds for a modest decrease (about 6%) in the attractive sigma(600) potential.Publication Open Access Relating D-0-D-0 mixing and D-0 -> l(+)l(-) with new physics(2009-01) Golowich, E; Hewett, J; Pakvasa, S; Petrov, AAWe point out how, in certain models of new physics, the same combination of couplings occurs in the amplitudes for both D0-D̅ 0 mixing and the rare decays D0→ℓ+ℓ-. If the new physics dominates and is responsible for the observed mixing, then a very simple correlation exists between the magnitudes of each; in fact the rates for the decay D0→ℓ+ℓ- are completely fixed by the mixing. Observation of D0→ℓ+ℓ- in excess of the standard model prediction could identify new physics contributions to D0-D̅ 0 mixing.Publication Metadata only KAON DECAYS AND A DETERMINATION OF THE SCALE OF CHIRAL SYMMETRY(1984) Donoghue, JF; Golowich, Eugene; Holstein, BRUsing effective chiral Lagrangians, we consider the occurrence of quadratic terms in the ΔI=1/2 K→3π matrix element. The inclusion of higher-derivative Lagrangians leads to a significant improvement over the usual current-algebra analysis. This allows an extraction directly from experimental data of Λχ, a measure of the scale of chiral symmetry. We give an operational definition of the chiral scale, and find Λχ≈1 GeV. The issue of uncertainty in the phenomenological determination of the B parameter is clarified.Publication Open Access The weak ope and dimension-eight operators(2001-01) Golowich, EPublication Metadata only TRIPLE-PRODUCT CORRELATIONS IN SEMILEPTONIC DECAYS(1989) Golowich, E; VALENCIA, GThe use of triple-product correlations to signal the presence of CP violations in decays of charged pseudoscalar mesons is studied. It is pointed out that observation of such correlations in the semileptonic modes is likely to be evidence for new physics. The effect of unitarity phases is discussed and a detailed analysis of the Weinberg Higgs-boson model of CP violation is carried out for charged B mesons and kaons.Publication Metadata only ARE THERE BARYONS WHICH CONTAIN CONSTITUENT GLUONS(1983) Golowich, E; HAQQ, E; KARL, GA study of three-quark—one-gluon configurations in the zero-strangeness, positive-parity sector is carried out. The quantum numbers of the ground-state levels in this system are identified. The mass spectrum is analyzed in both the bag-model and harmonic-oscillator dynamical frameworks. Mixing between the Q3 and Q3G sectors is determined, and implications of Q3-Q3G mixing are explored.Publication Open Access Comment on ‘Analysis of O(p2) Corrections to hðð|Q7,8|Ki’(2002-01) Cirigliano, Vincenzo; Golowich, EugeneWe extend in several respects our earlier work on O(p2) corrections to the matrix elements of the electroweak penguin operator Oewp. First, to facilitate comparison with certain lattice studies we calculate O(p2) corrections to 〈π|Oewp|K〉 in the SU(3) limit of equal light quark masses. Next, we demonstrate how an apparent disagreement in the literature regarding whether higher order chiral contributions increase or decrease 〈(ππ)I=2|Oewp|K〉 is simply a consequence of how the leading order chiral amplitude is defined. Finally, we address an aspect of the ε′/ε problem by estimating O(p2) corrections to recent determinations of 〈(ππ)I=2|Q7,8|K〉 which were carried out in the chiral limit.Publication Metadata only 2-BODY DECAYS OF THE NUCLEON(1980) Golowich, EWe compute branching ratios for proton and neutron decay for SU(5), SO(10), and SU(2)L×SU(2)R×U(1) unification schemes. Quark wave functions from the MIT bag model are used to describe hadron structure. The results differ from those of nonrelativistic SU(6). The proton and neutron total lifetimes are also estimated.Publication Open Access Dimension-eight operators in the weak OPE(2000-01) Cirigliano, V; Donoghue, JF; Golowich, EugeneWe argue that there is a potential flaw in the standard treatment of weak decay amplitudes, including that of ǫ′/ǫ. We show that (contrary to conventional wisdom) dimension-eight operators do contribute to weak amplitudes, at order GFαs and without 1/M2W suppression. We demonstrate the existence of these operators through the use of a simple weak hamiltonian. Their contribution appears in different places depending on which scheme is adopted in performing the OPE. If one performs a complete separation of short and long distance physics within a cutoff scheme, dimension-eight operators occur in the weak hamiltonian at order GFαs/μ2, μ being the separating scale. However, in an MS renormalization scheme for the OPE the dimension-eight operators do not appear explicitly in the hamiltonian at order GFαs. In this case, matrix elements must include physics above the scale μ, and it is here that dimension eight effects enter. The use of a cutoff scheme (especially quark model methods) for the calculation of the matrix elements of dimension-six operators is inconsistent with MS unless there is careful matching including dimension-eight operators. The contribution of dimension-eight operators can be minimized by working at large enough values of the scale μ. We find from sum rule methods that the contribution of dimension-eight operators to the dimension-six operator Q(6) 7 is at the 100% level for μ = 1.5 GeV. This suggests that presently available values of μ are too low to justify the neglect of these effects. Finally, we display the dimension-eight operators which appear within the Standard Model at one loop.Publication Metadata only WEAK DECAY CONSTANTS OF HEAVY MESONS(1980) Golowich, EThe weak decay constant for a hadron of arbitrary mass is computed. The leptonic decays of the charmed D±, F± mesons are then discussed.