Double proton tagging at the LHC as a means to discover new physics

We review the theoretical and experimental motivations behind recent proposals to add forward proton tagging detectors to the LHC experiments as a means to search for new physics.Comment: Talk given at the 5th Rencontres du Vietnam, 'New Views in Particle Physics' conference, Hanoi, August 200

Central Exclusive Di-jet Production at the Tevatron

We perform a phenomenological analysis of dijet production in double pomeron exchange at the Tevatron. We find that the CDF Run I results do not rule out the presence of an exclusive dijet component, as predicted by Khoze, Martin and Ryskin (KMR). With the high statistics CDF Run II data, we predict that an exclusive component at the level predicted by KMR may be visible, although the observation will depend on accurate modelling of the inclusive double pomeron exchange process. We also compare to the predictions of the DPEMC Monte Carlo, which contains a non-perturbative model for the central exclusive process. We show that the perturbative model of KMR gives different predictions for the di-jet ET dependence in the high di-jet mass fraction region than non-perturbative models.Comment: 17 pages, 15 figure

Diffractive production of high pt photons at HERA

We study the diffractive production of high pt photons at HERA. We have implemented the process as a new hard sub-process in the HERWIG event generator in order to prepare the ground for a future measurement.Comment: 4 pages, 4 figures. Contribution to the 1999 UK Phenomenology Workshop on Collider Physics, Durham, U

Low-temperature phases in Pb(Zr0.52Ti0.48)O3: A neutron powder diffraction study

A neutron powder diffraction study has been carried out on Pb(Zr0.52Ti0.48)O3 in order to resolve an ongoing controversy about the nature of the low-temperature structure of this strongly-piezoelectric and technologically-important material. The results of a detailed and systematic Rietveld analysis at 20 K are consistent with the coexistence of two monoclinic phases having space groups Cm and Ic respectively, in the approximate ratio 4:1, and thus support the findings of a recent electron diffraction study by Noheda et al. [Phys. Rev. B 66, 060103 (2002)]. The results are compared to those of two recent conflicting neutron powder diffraction studies of materials of the same nominal composition by Hatch et al. [Phys. Rev. B 65, 212101 (2002)] and Frantti et al. [Phys. Rev. B 66, 064108 (2002)].Comment: RevTex4, 16 pages, 6 color figure

Integral Agriculture: Taking seriously the mindset of the farmer, the interiority of the beings on the farm, and a metaphysics that connects them

With the steady increase in the market share of organic food over the last 30 years, some farmers have switched from conventional to sustainable agricultural practices in order to capitalize on those new markets. Are the practices the only things that need to change? Building off of Warwick Fox\u27s conception of transpersonal ecology, transpersonal agroecology (TPAE) is the name given to a proposed alternative mindset of the farmer derived from various alternative agricultural theorists of the last 100 years. These writers oppose the scientism and economism that typify industrial agriculture, subscribe to the notion that experiences of identification between the farmer and the beings on the farm are an important component of a truly sustainable agriculture, and suggest that a truly sustainable agriculture requires a radical critique of the metaphysical assumptions that underlie modern agricultural practices. A case is made that a process metaphysics (based on the philosophy of A.N. Whitehead) can productively support a transpersonal agroecological way of being on the farm with its requisite sustainable agricultural practices. Finally, though many theorists have analyzed both industrial and sustainable agriculture from an ideological perspective, most of them partake of a subtle form of materialism, recapitulating the belief that relationships among beings are exclusively external. This subtle materialism precludes the farmer from ascribing interiority to the majority of the beings she is in relationship with. Revisiting transpersonal agroecology, with an understanding of interiority, yields a truly holistic, integral agriculture that takes seriously the mindset of the farmer and the interiority of the beings on the farm

The Spaceborne Global Climate Observing Center (SGCOC): Executive summary

Conceptual planning of the Spaceborne portion of the Global Climate Observing Systems (SGCOS) is reviewed. Fundamentals of the SGCOS are summarized

The monoclinic phase in PZT: new light on morphotropic phase boundaries

A summary of the work recently carried out on the morphotropic phase boundary (MPB) of PZT is presented. By means of x-ray powder diffraction on ceramic samples of excellent quality, the MPB has been successfully characterized by changing temperature in a series of closely spaced compositions. As a result, an unexpected monoclinic phase has been found to exist in between the well-known tetragonal and rhombohedral PZT phases. A detailed structural analysis, together with the investigation of the field effect in this region of compositions, have led to an important advance in understanding the mechanisms responsible for the physical properties of PZT as well as other piezoelectric materials with similar morphotropic phase boundaries.Comment: 5 pages REVTeX file, 6 figures embedded. Presented at the Workshop on "Fundamental Physics of Ferroelectrics" held in Aspen, February 00. To appear in the proceeding