W asymmetries at CDF and D0

We present recent W and charged lepton asymmetry measurements from the CDF and D0 experiments. Theoretical predictions agree with the CDF W asymmetry, measured using a new matrix element technique. These theoretical predictions are less consistent with the latest lepton asymmetry measurements from D0 and CDF, especially for high charged lepton transverse momentum.Comment: 6 pages, 6 figure

Going with the Flow: Identifying a Single Commonality in Written and Performed Acting Theory

This study was designed to determine whether a single performance commonality could be determined to exist across styles of performance theory, and focused on investigating the experiential moment of performance. Identifying this commonality did not intend to codify the process or purpose of performance but to demonstrate the underlying human aspect of performance, irrespective of context or action, and give performers a starting point from which to approach a tradition radically different than the ones with which they are familiar. In his work, psychologist Mihaly Csikszentimihalyi describes the idea of flow, a merging of attention, awareness, and action which creates a holistic sensation that connects the body to its environment. This form of experience, it was predicted, would appear as an underlying commonality, regardless of the performance theory identifies. Information was gathered in two forms: first, theoretically, through the study of representative performance theories of differing styles; second, practically, through information gathered from professional performers. The elements of flow were found in both the styles used to represent the categories of performance theory and in evidence gathered from performers. Despite this, however, this particular study remains essentially inconclusive. Limited participation and structural flaws in the study limit the conclusiveness if the data. From the information gathered, a definite trend towards the common presence of flow can be identified, but further research remains necessary to conclusively state that it is the overarching commonality of performance theory. The strength of the results, however, indicates that a similar study with broader scope would produce its successful identification

SUSY Contributions to RbR_b and Top Decay

I report on a systematic analysis of the MSSM parameter space to obtain the best SUSY solution to the $R_b$ anomaly within the constraint of top quark decay. Phenomenological implications for top decay and direct stop production at the Tevatron collider are discussed.Comment: Latex file (3 pages)+ 2 ps files containing figures. Invited talk at SUSY96, Maryland, May 199

Competition for hydrogen bond formation in the helix-coil transition and protein folding

The problem of the helix-coil transition of biopolymers in explicit solvents, like water, with the ability for hydrogen bonding with solvent is addressed analytically using a suitably modified version of the Generalized Model of Polypeptide Chains. Besides the regular helix-coil transition, an additional coil-helix or reentrant transition is also found at lower temperatures. The reentrant transition arises due to competition between polymer-polymer and polymer-water hydrogen bonds. The balance between the two types of hydrogen bonding can be shifted to either direction through changes not only in temperature, but also by pressure, mechanical force, osmotic stress or other external influences. Both polypeptides and polynucleotides are considered within a unified formalism. Our approach provides an explanation of the experimental difficulty of observing the reentrant transition with pressure; and underscores the advantage of pulling experiments for studies of DNA. Results are discussed and compared with those reported in a number of recent publications with which a significant level of agreement is obtained.Comment: 21 pages, 3 figures, submitted to Phys Rev

A Model for the Thermodynamics of Globular Proteins

Comments: 6 pages RevTeX, 6 Postscript figures. We review a statistical mechanics treatment of the stability of globular proteins based on a simple model Hamiltonian taking into account protein self interactions and protein-water interactions. The model contains both hot and cold folding transitions. In addition it predicts a critical point at a given temperature and chemical potential of the surrounding water. The universality class of this critical point is new

Assurance of data integrity in petabyte data samples

We present a method for clustering data from high energy physics exper- iments on physical media. Data clustering based upon physics information can lead to large gains in access speed. However such clustering also increases vulnerability to data loss as any loss of a physical data store removes a data sample which has special physics characteristics. Measurements made with samples biased by losses of clustered data must be corrected for the e#11;ects of the loss. We discuss several methods for performing such corrections

Pathways in Two-State Protein Folding

The thermodynamics of proteins indicate that folding/unfolding takes place either through stable intermediates or through a two-state process without intermediates. The rather short folding times of the two-state process indicate that folding is guided. We reconcile these two seemingly contradictory observations quantitatively in a schematic model of protein folding. We propose a new dynamical transition temperature which is lower than the thermodynamic one, in qualitative agreement with in vivo measurement of protein stability using E.coli. Finally we demonstrate that our framework is easily generalized to encompass cold unfolding, and make predictions that relate the sharpness of the cold and hot unfolding transitions.Comment: 4 pages RevTeX, 5 Postscript figur