9965823
Chiral symmetry breaking in brane models
We discuss the chiral symmetry breaking in general intersecting Dq/Dp brane models consisting of Nc Dq-branes and a single Dp-brane with an s-dimensional intersection. There exists a QCD-like theory localized at the intersection and the Dq/Dp model gives a holographic description of it. The rotational symmetry of directions transverse to both of the Dq and Dp-branes can be identified with a chiral symmetry, which is non-Abelian for certain cases. The asymptotic distance between the Dq-branes and the Dp-brane corresponds to a quark mass. By studying the probe Dp-brane dynamics in a Dq-brane background in the near horizon and large Nc limit we find that the chiral symmetry is spontaneously broken and there appear (pseudo-)Nambu-Goldstone bosons. We also discuss the models at finite temperature.
210000411
Three form flux with N=2 supersymmetry on AdS(5) x S**5
14288400
SUPER WEYL ANOMALIES IN THE AdS/CFT CORRESPONDENCE
Anomalies of N=(4,4) superconformal field theories coupled to a conformal supergravity background in two dimensions are computed by using the AdS/CFT correspondence. We find that Weyl, axial gauge and super Weyl transformations are anomalous, while general coordinate, local Lorentz, vector gauge and local supertransformations are not. The coefficients of the anomalies show that the superconformal field theories have the central charge expected in the AdS/CFT correspondence.
18305180
A note on supersymmetry in noncommutative field theories
Abstract We show that a solution of the type IIB supergravity representing D3-branes in the presence of a 2-form background has 16 supersymmetries by explicitly constructing the transformation parameter of unbroken supersymmetry. This solution is dual to a noncommutative Yang–Mills theory in a certain limit.
118417442
Coupling of the BLG theory to a conformal supergravity background
A bstractThe Bagger-Lambert-Gustavsson theory is coupled to an off-shell D = 3, $ \mathcal{N}=8 $ conformal supergravity background. Local transformation laws of the conformal supergravity multiplet are obtained from those of the D = 4, $ \mathcal{N}=8 $ SO(8) gauged super-gravity. The complete Lagrangian and local transformation laws of the coupled theory are obtained. As an application the supercurrent multiplet in a flat background is obtained.
14520037
Comments on higher derivative terms for the tachyon action
We consider the open string tachyon action in a world-sheet sigma model approach. We present explicit calculations up to order 8 in derivatives for the bosonic string, and mimic these to order 6 for the superstring, including terms with multiple derivatives acting on the tachyon field. We reproduce lower derivative terms obtained elsewhere, and speculate on the role of the world-sheet contact terms regularizing the action for the superstring tachyon.
122637395
Quasielastic scattering of He6 from C12 at 82.3 MeV/nucleon
Quasielastic scattering of {sup 6}He on a {sup 12}C target was measured at 82.3 MeV/nucleon. Special care was taken to treat the background subtraction at very small angles. The measured differential cross-sections show a large enhancement at small angles relative to the Rutherford cross-section, similar to those observed at lower energies for the scattering of halo nuclei. The overall structure of the cross-section is reasonably reproduced by the optical model calculations. The inelastic channels which populate two low-lying excited states of {sup 12}C target nucleus were included in the framework of the coupled channel analysis. Further systematic theoretical analysis is encouraged.
120592706
Recoil proton tagged knockout reaction for 8He
Abstract We report for the first time the discrimination of the core fragment knockout and valence nucleon knockout reaction mechanisms at medium energy range, by the use of the recoil proton tagging technique. Intense 8 He beams at 82.3 MeV/u were supplied by the RIPS beam line at RIKEN, and impinged on both hydrogen and carbon targets. Recoil protons were detected in coincidence with the forward moving core fragments and neutrons. The core fragment knockout mechanism is identified through the polar angle correlation and checked by various kinematics relations. This mechanism may be used to extract the cluster structure information of unstable nuclei. On the other hand, with the selection of the tagged valence nucleon knockout mechanism, a narrower peak of 7 He ground state is obtained. The extracted neutron spectroscopic factor S n = 0.512 ( 18 ) is relatively smaller than the no-tagged one, and is in good agreement with the prediction of ab initio Greenʼs function Monte Carlo calculations.
120974809
Investigation of excited states in Mg-22 via resonant elastic scattering of Na-21+p and its astrophysical implications
The excited states in {sup 22}Mg have been investigated by the resonant elastic scattering of {sup 21}Na+p. A 4.0 MeV/nucleon {sup 21}Na beam was separated by the Center for Nuclear Study (CNS) radioactive ion beam separator (CRIB) and then used to bombard a thick (CH{sub 2}){sub n} target. The energy spectra of recoiled protons were measured at scattering angles of {theta}{sub c.m.}{approx_equal}172 deg.,146 deg., and 134 deg., respectively. A wide energy-range of excitation function in {sup 22}Mg (up to E{sub x}{approx}8.9 MeV) was obtained simultaneously with a thick-target method, and a state at 7.06 MeV was newly observed. The resonant parameters were deduced from an R-matrix analysis of the center-of-mass (c.m.) differential cross-section data with a SAMMY-M6-BETA code. The astrophysical resonant reaction rate for the {sup 18}Ne({alpha},p){sup 21}Na reaction was recalculated based on the present parameters. Generally speaking, the present rates are much smaller than the previous ones.
120812796
A Thick and Large Active Area Si(Li) Detector
A 5 inch diameter, 3mm thick silicon detector has been fabricated using a nondetector grade crystal. The detector characteristics of the silicon detector were examined with infrared light as well as a hadron beam.