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 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 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 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.Publication 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 ADDENDUM TO DELTA-S=1-CHIRAL LAGRANGIANS REVISITED(1987) Golowich, EIt is shown that the number of independent four-derivative quartic chiral Lagrangians which can contribute to the quadratic Dalitz-plot parameters of K3π is four.Publication Systematics of soft final-state interactions in B decays(1996) Donoghue, JF; Golowich, Eugene; Petrov, AA; Soares, JMBy using very general and well established features of soft strong interactions we show, contrary to conventional expectations, that (i) soft final-state interactions (FSI) do not disappear for large mB, (ii) inelastic rescattering is expected to be the main source of soft FSI phases, and (iii) FSI which interchange charge and/or flavors are suppressed by a power of mB, but are quite likely to be significant at mB≃5GeV. We briefly discuss the influence of these interactions on tests of CP violation and on theoretical calculations of weak decays.Publication Two-loop analysis of axial vector current propagators in chiral perturbation theory(1998) Golowich, E; Kambor, JWe perform a calculation of the isospin and hypercharge axial vector current propagators [ΔA3μν(q) and ΔA8μν(q)] to two loops in SU(3)×SU(3) chiral perturbation theory. A large number of O(p6) divergent counterterms are fixed, and complete two-loop renormalized expressions for the pion and eta masses and decay constants are obtained. The calculated isospin and hypercharge axial vector polarization functions are used as input in new chiral sum rules, valid to second order in the light quark masses. Some phenomenological implications of these sum rules are considered.Publication BARYON MATRIX-ELEMENTS OF THE PARITY-VIOLATING WEAK HAMILTONIAN(1982) Golowich, Eugene; Holstein, BRExpressions are derived for baryon matrix elements of the parity-violating weak Hamiltonian away from the limit of SU(3) invariance. Their magnitudes are compared with those of the parity-conserving weak Hamiltonian and the impact of these new contributions on calculations of various weak nonleptonic reactions is estimated.Publication Inverse-moment chiral sum rules(1996) Golowich, E; Kambor, JA general class of inverse-moment sum rules was previously derived by the authors in a chiral perturbation theory (ChPT) study at two-loop order of the isospin and hypercharge vector-current propagators. Here, we address the evaluation of the inverse-moment sum rules in terms of existing data and theoretical constraints. Two kinds of sum rules are seen to occur: those which contain as-yet undetermined O(q6) counterterms and those free of such quantities. We use the former to obtain phenomenological evaluations of two O(q6) counterterms. Light is shed on the important but difficult issue regarding contributions of higher orders in the ChPT expansion.Publication Chiral sum rules to second order in quark mass(1997) Golowich, E; Kambor, JA new calculation of the isospin and hypercharge axial-vector current propagators [ ΔA33μν(q2) and ΔA88μν(q2)] to two loops in SU(3)×SU(3) chiral perturbation theory is used to derive chiral spectral function sum rules valid to second order in the light quark masses. Explicit forms are given for the three-pion isospin axial-vector spectral functions at low energy, and application of the sum rules to the determination of counterterms of the chiral Lagrangian is discussed.