B Factory Constraints on Isosinglet Down Quark Mixing, and Predictions For Other CP Violating Experiments

In the main part of the paper we project forward to having $B$ factory determinations of $\sin(2\beta)$ and $\sin(2\alpha)$, for which we take several values. First, we use a joint $\chi^2$ analysis of CKM experiments to constrain CKM matrix elements in the standard model, and experiments on the angles $\alpha$, $\beta$, and $\gamma$, and on $x_s$ and null $CP$ asymmetries. Then we invoke mixing to a new isosinglet down quark (as in E$_6$) which induces FCNC that allow a $Z^0$ mediated contribution to $B-\bar B$ mixing and which brings in new phases. We then repeat the $\chi^2$ analysis, now including experimental constraints from FCNC as well, finding much larger ranges of prediction for the $B$ factory. We then add projected $B$ factory results on $\sin(2\beta)$ and $\sin(2\alpha)$ and repeat both analyses. In $(\rho,\eta)$ and $(x_s,\sin{(\gamma)})$ plots for the extra isosinglet down quark model, we find multiple regions that will require experiments on $\sin{(\gamma)}$ and/or $x_s$ to decide between and possibly to effectively bound out the extra down quark contribution.Comment: 13 pages using revtex, with 6 uuencoded postscript figure

Subunit Stoichiometry of a Heteromultimeric G protein-coupled Inward-rectifier K^+ Channel

We investigated the stoichiometry of the heteromultimeric G protein-coupled inward-recitfier K^+ channel (GIRK) formed from GIRK1 and GIRK4 subunits. Multimeric GIRK constructs with several concatenated channel subunits were expressed in Xenopus oocytes. Coexpression of various trimeric constructs with different monomers clearly showed that the functional channel has stoichiometry (GIRK1)_2(GIRK4)_2. Efforts to establish a preferred arrangement of subunits around the channel pore suggest that more than one arrangement may be viable

Effects of Anomalous Couplings of Quarks on Prompt Photon Production

Prompt photon production is sensitive to the anomalous couplings of gluons to quarks, because it is mainly produced by quark-gluon scattering. We will examine the effects of the anomalous chromoelectric and chromomagnetic dipole moment couplings of quarks on prompt photon production. Using the data collected by CDF and D0 at the Fermilab Tevatron we put a bound on these anomalous couplings. We also estimate the sensitivity of various future high energy collider experiments to these anomalous couplings.Comment: 11 pages in LaTex2e and 3 figures embedded using package{graphicx

W_R Effects on CP Asymmetries in B Meson Decays

After we have limited elements of the right-handed CKM matrix to satisfy the bounds for CP violation epsilon_K in K meson systems, the right-handed charged current gauge boson W_R is shown to substantially affect CP asymmetries in B systems. A joint chi-squared analysis is applied to B-Bbar mixing to constrain the right-handed CKM matrix elements. In (sin(2alpha), sin(2beta)), (x_s, sin(gamma)), (rho-eta), and (x_s, sin(2phi_s)) plots in the presence of the W_R boson, we find larger allowed experimental regions that can distinguish this model from the standard model.Comment: 14 pages, RevTeX, 4 postscript figures. Talks based on this and other references are at http://www.physics.uci.edu/~silverma/ Revised and updated version now includes sin(2beta) and x_s data (from summer '01), inclusion of Penguin effects, stronger arguments for the parametrizations used, and elimination of the omega variabl

Conformational effects on high-spin organic molecules

The ability of m-phenylene to ferromagnetically couple spin-containing substituents that are substantially twisted out of conjugation is investigated. The "bis(TMM)" strategy is employed, in which two triplet TMM biradicals are linked through m-phenylene to produce relatively stable, organic tetraradicals that are characterized by EPR spectroscopy. Under conditions of moderate twisting (4), ferromagnetic coupling is seen, and the tetraradical has a quintet ground state. Severely twisting both TMMs as in 13 disrupts spin communication, and two noninteracting triplets are produced. This is in contrast to other highly twisted m-phenylene derivatives, in which antiferromagnetic coupling has been observed. Surprisingly, severely twisting only one TMM (14) still produces ferromagnetic coupling and a quintet ground state through a spin polarization mechanism analogous to that proposed for 90° twisted ethylene. Several ring-constrained TMMs (17-19) are investigated as models for more nearly planar systems