Progress in weakly coupled string phenomenology

The weakly coupled vacuum of $E_8\otimes E_8$ heterotic string theory remains an attractive scenario for particle physics. The particle spectrum and the issue of dilaton stabilization are reviewed. A specific model for hidden sector condensation and supersymmetry breaking, that respects known constraints from string theory, is described, and its phenomenological and cosmological implications are discussed.Comment: 15 pages, full postscript also available from http://phyweb.lbl.gov/theorygroup/papers/48640.p

Full Component Lagrangian in the Linear Multiplet Formulation of String-inspired Effective Supergravity

We compute the component field 4-dimensional N=1 supergravity Lagrangian that is obtained from a superfield Lagrangian in the U(1)_K formalism with a linear dilaton multiplet. All fermionic terms are presented. In a variety of important ways, our results generalize those that have been reported previously, and are flexible enough to accomodate many situations of phenomenological interest in string-inspired effective supergravity, especially models based on orbifold compactifications of the weakly-coupled heterotic string. We provide for an effective theory of hidden gaugino and matter condensation. We include supersymmetric Green-Schwarz counterterms associated with the cancellation of U(1) and modular duality anomalies; the modular duality counterterm is of a rather general form. Our assumed form for the dilaton Kahler potential is quite general and can accomodate Kahler stabilization methods. We note possible applications of our results. We also discuss the usefulness of the linear dilaton formulation as a complement to the chiral dilaton approach.Comment: 2+34 page

Consequences of the regular distribution of sainfoin hay on gastrointestinal parasitism with nematodes and on milk production in a dairy goat flock

The objectives of the current study were to examine the potential effects of distribution of sainfoin hay on nematode parasitism in a producing herd and to measure the consequences on milk production. The survey was performed in an experimental herd of 120-dairy-goat farm during a whole 9-month grazing season. Every month, 60 goats received indoors on average 1.36 kg of sainfoin hay for 10 days whereas the 60 remaining goats were used as controls, thus receiving the same amount of lucerne hay at the same time. The nutritional values of both hays were comparable except that concentrations of condensed tannins was higher in sainfoin than in lucerne hay, i.e. 2.52% versus 0.7% of diet DM. Intakes of the two types of hay were recorded along with each period. Individual faecal and blood samples were performed monthly to compare parasitological and pathophysiological parameters in the two groups. Milk yield, fat and protein contents were measured fortnightly. A higher consumption of hay was repeatedly recorded in the sainfoin versus the control group. Irrespective to dietary treatment, nematode egg excretions were low during the whole season. Meanwhile, egg output was significantly lowest in the sainfoin group, but the composition in nematode genera was similar among the two groups. Based on a semi quantitative index for assessment of faecal consistency, a lower faecal dry matter content was also found in goats from the sainfoin group. The two animal groups exhibited similar milk yield, fat and protein contents. The differences in egg excretion between the two groups might be due to higher intake of hay in the barn thus to low consumption of grass, a source of parasite infection, or to the effect of some secondary compounds, like tannins. Whatever the mechanism involved, our results suggest that a regular distribution of sainfoin hay to dairy goats might be associated with a reduction in parasitism with gastrointestinal nematodes, without negative consequences on milk production. © 2005 Elsevier B.V. All rights reserved

Caractéristiques de la reproduction de la brebis Oudah (Niger)

L'étude des caractéristiques de la reproduction du mouton Oudah a été entreprise sur un petit troupeau à l'Université de Niamey, de janvier 1977 à juin 1979. Le comportement sexuel de la femelle est décrit, ainsi que les principaux résultats ayant trait à l'ostrus (longueur du cycle, durée de l'ostrus, répartition annuelle), à la durée de la gestation et au nombre de petits par porté

Phenomenological Aspects of Heterotic Orbifold Models at One Loop

We provide a detailed study of the phenomenology of orbifold compactifications of the heterotic string within the context of supergravity effective theories. Our investigation focuses on those models where the soft Lagrangian is dominated by loop contributions to the various soft supersymmetry breaking parameters. Such models typically predict non-universal soft masses and are thus significantly different from minimal supergravity and other universal models. We consider the pattern of masses that are governed by these soft terms and investigate the implications of certain indirect constraints on supersymmetric models, such as flavor-changing neutral currents, the anomalous magnetic moment of the muon and the density of thermal relic neutralinos. These string-motivated models show novel behavior that interpolates between the phenomenology of unified supergravity models and models dominated by the superconformal anomaly.Comment: 47 pages, 14 figure

The signal of Z±(4430)Z^\pm(4430) in nucleon-antinucleon scattering

We study the production of $Z^\pm(4430)$ at a nucleon-antinucleon scattering experiment. Considering the PANDA experiment to be an ideal platform to explore the production of the charmonium and charmonim-like states, we suggest the forthcoming PANDA experiment to pay attention to the production of $Z^\pm(4430)$.Comment: 6 pages, 15 figures. Published version in EPJ

5.5-7.5 MeV Proton generation by a moderate intensity ultra-short laser interaction with H2O nano-wire targets

We report on the first generation of 5.5-7.5 MeV protons by a moderate intensity short-pulse laser (4.5 \times 1017 W/cm^2, 50 fsec) interacting with H2O nano-wires (snow) deposited on a Sapphire substrate. In this setup, the laser intensity is locally enhanced by the tip of the snow nano-wire, leading to high spatial gradients. Accordingly, the plasma near the tip is subject to enhanced ponderomotive potential, and confined charge separation is obtained. Electrostatic fields of extremely high intensities are produced over the short scale length, and protons are accelerated to MeV-level energies.Comment: submitted to PRL, under press embargo. 6 figure

Identified particle correlation studies in central Au + Au collisions at sqrt(S)= 200 GeV

We present correlations between strange baryons and mesons with charged hadrons in AuAu and pp collisions at sqrt(s)=200 GeV for different pT ranges and centralities. We observe that for central AuAu collisions, the large width of the back side correlations indicates a collapse of the jet structure. This is consistent with previous measurement of suppression of the back side correlation for unidentified charged hadrons. However, in the medium pT range the same side correlations show large AA/pp ratios and wek centrality dependencies which indicate different medium modification of the soft jet components. For different leading particle species we have found no significant difference for both same side and back side correlations. These results are comparable to PHENIX's measurements in similar pT rangeComment: proceeding for HQ200

Comment on "Hara's theorem in the constituent quark model"

It is pointed out that current conservation alone does not suffice to prove Hara's theorem as it was claimed recently. By explicit calculation we show that the additional implicit assumption made in such "proofs" is that of a sufficiently localized current.Comment: 8 pages, Late

Weak radiative hyperon decays, Hara's theorem and the diquark

Weak radiative hyperon decays are discussed in the diquark-level approach. It is pointed out that in the general diquark formalism one may reproduce the experimentally suggested pattern of asymmetries, while maintaining Hara's theorem in the SU(3) limit. At present, however, no detailed quark-based model of parity-violating diquark-photon coupling exists that would have the necessary properties.Comment: 10 pages, LaTe