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Articles 61 - 83 of 83
Full-Text Articles in Physical Sciences and Mathematics
Radiation From A Suddenly Moving Sheet Of Charge, Br Holstein
Radiation From A Suddenly Moving Sheet Of Charge, Br Holstein
Barry R Holstein
Apparent paradoxes associated with Feynman’s picture of plane wave radiation arising from a uniform sheet of surface charge which is suddenly placed into motion are pointed out and resolved.
The Aharonov-Bohm Effect And Variations, Br Holstein
The Aharonov-Bohm Effect And Variations, Br Holstein
Barry R Holstein
The subject of anholonomy in physics has recently been emphasized via discussions of the Berry phase. A particular example of this phenomenon, which does not require the adiabatic condition is the familiar Aharonov-Bohm (AB) effect. We herein review the AB effect and show that two additional phenomena, namely the Aharonov-Casher effect and rotating superconducting quantum interference device systems, can be analysed using identical mathematical frameworks.
Chiral Anomaly And Gamma 3 Pi, Br Holstein
Chiral Anomaly And Gamma 3 Pi, Br Holstein
Barry R Holstein
Measurement of the γ3π process has revealed a possible conflict with what should be a solid prediction generated by the chiral anomaly. We show that inclusion of appropriate energy-momentum dependence in the matrix element reduces the discrepancy.
Kl-]Pi-0e+E- As A Probe Of Cp Violation, Jf Donoghue, Br Holstein, G Valencia
Kl-]Pi-0e+E- As A Probe Of Cp Violation, Jf Donoghue, Br Holstein, G Valencia
Barry R Holstein
We point out that the decay mode KL→π0e+e- is predominantly CP violating in the standard model and is expected to occur with a branching ratio of several parts in 1012. The decay should be sensitive to direct ΔS=1 CP violation. Analysis of the Dalitz plot may enable the CP-violating nature of the process to be confirmed.
Virtual Compton Scattering And Generalized Polarizabilities Of The Nucleon In Heavy Baryon Chiral Perturbation Theory, Thomas Hemmert, Br Holstein, Et. Al
Virtual Compton Scattering And Generalized Polarizabilities Of The Nucleon In Heavy Baryon Chiral Perturbation Theory, Thomas Hemmert, Br Holstein, Et. Al
Barry R Holstein
The spin-independent part of the virtual Compton scattering (VCS) amplitude from the nucleon is calculated within the framework of heavy baryon chiral perturbation theory (HBChPT). The calculation is performed to third order in external momenta according to chiral power counting. The relation of the tree-level amplitudes to what is expected from the low-energy theorem is discussed. We relate the one-loop results to the structure coefficients of a low-energy expansion for the model-dependent part of the VCS amplitude recently defined by Fearing and Scherer. Finally we discuss the connection of our results with the generalized polarizabilities of the nucleon defined by …
Cp Violation 1984 - The Km Model Confronts Experiment, Br Holstein
Cp Violation 1984 - The Km Model Confronts Experiment, Br Holstein
Barry R Holstein
Using recent experimental data involving the b, t quarks and the new measurement of η+−/ηoo we show that the KM picture of CP violation is barely compatible with these results. Slight improvements in any of these limits could require abandonement of the KM picture as the sole source of CP nonconservation, and some of the resultant required “new physics” is discussed.
Flexible String In Special Relativity, Br Holstein, Ar Swift
Flexible String In Special Relativity, Br Holstein, Ar Swift
Barry R Holstein
The relativistic transformation laws for force imply that a moving string, no matter how flexible, may exert a force perpendicular to its length.
Quantum Gravitational Corrections To The Nonrelativistic Scattering Potential Of Two Masses, Nej Bjerrum-Bohr, Jf Donoghue, Br Holstein
Quantum Gravitational Corrections To The Nonrelativistic Scattering Potential Of Two Masses, Nej Bjerrum-Bohr, Jf Donoghue, Br Holstein
Barry R Holstein
We treat general relativity as an effective field theory, obtaining the full nonanalytic component of the scattering matrix potential to one-loop order. The lowest order vertex rules for the resulting effective field theory are presented and the one-loop diagrams which yield the leading nonrelativistic post-Newtonian and quantum corrections to the gravitational scattering amplitude to second order in G are calculated in detail. The Fourier transformed amplitudes yield a nonrelativistic potential and our result is discussed in relation to previous calculations. The definition of a potential is discussed as well, and we show that the ambiguity of the potential under coordinate …
Bounds On Right-Handed Currents From A Relative Beta-Polarization Measurement With Polarized In-107, N Severijns, M Allet, J Camps, P Demoor, J Deutsch, F Gimenonogues, Br Holstein, Bh King, O Naviliatcuncic, I Pepe, R Prieels, Pa Quin, P Schuurmans, R Siebelink, W Vanderpoorten, J Vanhaverbeke, L Vanneste, J Wouters
Bounds On Right-Handed Currents From A Relative Beta-Polarization Measurement With Polarized In-107, N Severijns, M Allet, J Camps, P Demoor, J Deutsch, F Gimenonogues, Br Holstein, Bh King, O Naviliatcuncic, I Pepe, R Prieels, Pa Quin, P Schuurmans, R Siebelink, W Vanderpoorten, J Vanhaverbeke, L Vanneste, J Wouters
Barry R Holstein
The first measurements of the longitudinal polarization of positrons emitted by polarized 107In are reported. The positron polarization is deduced from the time-resolved decay spectrum of positronium hyperfine states. Our result is in agreement with the standard electro-weak model and provides a new lower limit for the mass of an eventual, predominantly right-handed charged W-gauge boson of 220 GeV/c2.
Long Distance Regularization In Chiral Perturbation Theory With Decuplet Fields, B Borasoy, Br Holstein, R Lewis, Ppa Ouimet
Long Distance Regularization In Chiral Perturbation Theory With Decuplet Fields, B Borasoy, Br Holstein, R Lewis, Ppa Ouimet
Barry R Holstein
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 masses, axial-vector couplings, S-wave nonleptonic hyperon decays and magnetic moments are evaluated in a chirally consistent fashion by employing a cutoff to implement long distance regularization. The convergence of the chiral expansions of these quantities is improved compared to the dimensionally regularized version which indicates that the propagation of Goldstone bosons over distances smaller than a typical hadronic size, which is beyond the regime of chiral perturbation theory but included by dimensional regularization, is removed …
Fundamental Symmetries And The Standard Model, Br Holstein
Fundamental Symmetries And The Standard Model, Br Holstein
Barry R Holstein
No abstract provided.
Overview Of Hadronic Parity Violation, Br Holstein
Overview Of Hadronic Parity Violation, Br Holstein
Barry R Holstein
The subject of hadronic parity violation is nearly fifty years old, but a good deal of uncertainty remains, despite many efforts both theoretical and experimental. A brief summary of the field is presented and a plan is proposed for new experimental work which, when combined with a new theoretical tack based on effective field theory, should lead to resolution of the present difficulties.
Nn, N-Delta Couplings And The Quark-Model, Tr Hemmert, Br Holstein, Nc Mukhopadhyay
Nn, N-Delta Couplings And The Quark-Model, Tr Hemmert, Br Holstein, Nc Mukhopadhyay
Barry R Holstein
We examine mass-corrected SU(6) symmetry predictions in the quark model relating vector, axial-vector, and strong NN and NΔ couplings, and demonstrate that the experimental NΔ value is significantly higher than predicted in each case. Nevertheless the Goldberger-Treiman relation is satisfied in both sectors. Possible origins of the discrepancy of the quark model predictions with experiments are discussed.
Helicity Structure In Low- And Intermediate-Energy Weak Interaction, N Severijns, M Allet, K Bodek, Ba Brown, J Camps, P De Moor, J Deutsch, M Ferro-Luzzi, F Gimeno-Nogues, J Govaerts, Br Holstein, R Kirchner, J Lang, R Muller, S Navert, O Naviliat-Cuncic, T Otto, L Pepe, R Prieels, Pa Quin, P Schuurmans, J Sromicki, E Stephan, E Thomas, A Van Geert, L Vanneste, B Vereecke, J Zejma
Helicity Structure In Low- And Intermediate-Energy Weak Interaction, N Severijns, M Allet, K Bodek, Ba Brown, J Camps, P De Moor, J Deutsch, M Ferro-Luzzi, F Gimeno-Nogues, J Govaerts, Br Holstein, R Kirchner, J Lang, R Muller, S Navert, O Naviliat-Cuncic, T Otto, L Pepe, R Prieels, Pa Quin, P Schuurmans, J Sromicki, E Stephan, E Thomas, A Van Geert, L Vanneste, B Vereecke, J Zejma
Barry R Holstein
We report on the status of the measurements of the longitudinal polarization of positrons emitted by polarized 107In and 12N nuclei. Present results yield a lower limit of 306 GeV/c2 (90 % CL) for the mass of a possible W gauge boson with predominantly right-handed couplings, if interpreted in the framework of the manifest left-right symmetric model. In addition, the helicity structure of the weak interaction is discussed on the basis of experimental results at low and intermediate energies in the leptonic, semileptonic and hadronic sectors. Whereas in the minimal manifest left-right symmetric extension of the Standard Model the results …
The Delta-S=2 Matrix Element For K0-Kbar0 Mixing, Jf Donoghue, Eugene Golowich, Br Holstein
The Delta-S=2 Matrix Element For K0-Kbar0 Mixing, Jf Donoghue, Eugene Golowich, Br Holstein
Barry R Holstein
We use SU(3) and PACAC to relate the ΔS = 2 matrix element Image Full-size image (1K) to experimental information on the Image contribution to K → 2π. Our results is Image which is about 33% of the vacuum insertion value.
Components Of A Chiral Coefficient, Jf Donoghue, Br Holstein
Components Of A Chiral Coefficient, Jf Donoghue, Br Holstein
Barry R Holstein
One of the coefficients that parametrizes the chiral Lagrangian of QCD is expressible in terms of a sum rule for which the integrand is known from experiment. We confront two model calculations of this coefficient with the behavior of the data. The model related to vector dominance reproduces the sumrule behavior very well, whereas a one-loop chiral quark model calculation fails badly. The sum rule allows one to identify those ingredients which are needed to make the quark method more realistic.
Chiral Symmetry And The Large-Nc Limit In Kl4 Decays, C Riggenbach, J Gasser, Jf Donoghue, Br Holstein
Chiral Symmetry And The Large-Nc Limit In Kl4 Decays, C Riggenbach, J Gasser, Jf Donoghue, Br Holstein
Barry R Holstein
The treatment of kaon decays using chiral symmetry yields predictions for thè form factors in K→ππeν. In addition, the large-Nc limit of QCD implies that a particular combination of low-energy constants should be suppressed. We present the chiral predictions for Kl4 decays at next-to-leading order in the energy expansion. By combining the phenomenologies of Kl4 and ππ scattering, we test these predictions and provide a determination of the parameters in the chiral Lagrangian of QCD.
Baryon Matrix-Elements Of The Parity-Violating Weak Hamiltonian, Eugene Golowich, Br Holstein
Baryon Matrix-Elements Of The Parity-Violating Weak Hamiltonian, Eugene Golowich, Br Holstein
Barry R Holstein
Expressions 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.
Elementary Derivation Of The Radiation-Field From An Accelerated Charge, Br Holstein, Ar Swift
Elementary Derivation Of The Radiation-Field From An Accelerated Charge, Br Holstein, Ar Swift
Barry R Holstein
Using only the equivalence principle and elementary electrodynamics we calculate the radiation from an accelerating charge in a direction perpendicular to its motion.
Induced Scalar Effects In Semi-Leptonic Weak-Interactions, Br Holstein
Induced Scalar Effects In Semi-Leptonic Weak-Interactions, Br Holstein
Barry R Holstein
The size of an induced scalar coupling in semileptonic weak processes arising from quark mass differences, impulse-approximation results, and charged-Higgs-boson exchange is estimated. Although the predicted size of the effect is non-negligible it is apparently below present experimental capability to detect.
Decay Pi(0)->Gamma Gamma To Next To Leading Order In Chiral Perturbation Theory, Jl Goity, Am Bernstein, Br Holstein
Decay Pi(0)->Gamma Gamma To Next To Leading Order In Chiral Perturbation Theory, Jl Goity, Am Bernstein, Br Holstein
Barry R Holstein
The π0→γγ decay width is analyzed within the combined framework of chiral perturbation theory and the 1/Nc expansion up to O(p6) and O(p4×1/Nc) in the decay amplitude. The η′ is explicitly included in the analysis. It is found that the decay width is enhanced by about 4.5% due to the isospin-breaking induced mixing of the pure U(3) states. This effect, which is of leading order in low energy expansion, is shown to persist nearly unchanged at next to leading order. The chief prediction with its estimated uncertainty is Γπ0→γγ=8.10±0.08eV. This prediction at the 1% level makes the upcoming precision measurement …
Long-Distance Chiral Contributions To The Kl-Ks Mass Difference, Jf Donoghue, Eugene Golowich, Br Holstein
Long-Distance Chiral Contributions To The Kl-Ks Mass Difference, Jf Donoghue, Eugene Golowich, Br Holstein
Barry R Holstein
We use chiral symmetry to calculate the very long distance contributions to the KL–KS mass difference. We determine that the dominant effect arises from the two-pion dispersive contribution, which by itself produces a large result comparable to or greater than the experimental mass difference (with the correct sign). Some contributions from intermediate distance are also estimated and could be significant. These conclusions reinforce the need, first pointed out by Wolfenstein, to include an additive parameter to account for the long distance contributions in phenomenological studies of the KL–KS mass difference. This parameter may be determined from the data if the …
Bound States Of A Uniform Spherical Charge Distribution - Revisited!, Bc Tiburzi, Br Holstein
Bound States Of A Uniform Spherical Charge Distribution - Revisited!, Bc Tiburzi, Br Holstein
Barry R Holstein
In this note, we revisit modeling the nucleus as a uniformly charged sphere in order to examine finite nuclear size effects on atomic binding energies. We use nonrelativistic quantum mechanics to extract binding energies of a negatively charged lepton bound by a uniform-sphere potential. Energies are determined by using MATHEMATICA to match interior and exterior solutions at the nuclear radius. Muonic lead and tin binding energies are found, as are their fine-structure transition energies, and compared with experimental data. In the course of our reinvestigation of this problem, we came upon several subtle features of using infinite (especially asymptotic) series …