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Observation of B Meson Decays to omegaK* and Improved Measurements for omegarho and omegaf0

Description: We present measurements of B meson decays to the final states {omega}K*, {omega}{rho}, and {omega}f{sub 0}, where K* indicates a spin 0, 1, or 2 strange meson. The data sample corresponds to 465 x 10{sup 6} B{bar B} pairs collected with the BABAR detector at the PEP-II e{sup +}e{sup -} collider at SLAC. B meson decays involving vector-scalar, vector-vector, and vector-tensor final states are analyzed; the latter two shed new light on the polarization of these final states. We measure the branch… more
Date: January 29, 2009
Creator: Aubert, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A P-Carbon CNI Polarimeter for RHIC.

Description: The RHIC spin program requires excellent polarimetry so that the knowledge of the beam polarization does not limit the errors on the experimental measurements. However, polarimetry of proton beams with energies higher than about 30GeV poses a difficult challenge. For polarization monitoring during operation, a fast and reliable polarimeter is required that produces a polarization measurement with a 10% relative error within a few minutes. The p-Carbon elastic scattering in the Coulomb-Nuclear-S… more
Date: March 29, 1999
Creator: Huang, H.; Bai, M.; Bunce, G.; Makdisi, Y.; Roser, T.; Imai, K. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Measurement of the B+- --> rho+- pi0 Branching Fraction and Direct CP Asymmetry

Description: An improved measurement of the process B{sup {+-}} {yields} {rho}{sup {+-}}{pi}{sup 0} is presented. The data sample of 211 fb{sup -1} comprises 232 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. The yield and CP asymmetry are calculated using an extended maximum likelihood fitting method. The branching fraction and asymmetry are found to be {Beta}(B{sup {+-}} {yields} {rho}{sup {+-}}{pi}{sup 0}) = [10.0 {+-} 1.4 (Sta… more
Date: June 29, 2005
Creator: Aubert, B.; Barate, R.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J. P. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Twist-three Fragmentation Function Contribution to the Single Spin Asymmetry in pp Collisions

Description: We study the twist-three fragmentation function contribution to the single transverse spin asymmetries in inclusive hadron production in pp collisions, pp->h+X. In particular, we evaluate the so-called derivative contribution which dominates the spin asymmetry in the forward direction of the polarized proton. With certain parametrizations for the twist-three fragmentation function, we estimate its contribution to the asymmetry of pi0 production at RHIC energy. We find that the contribution i… more
Date: January 29, 2010
Creator: Kang, Zhong-Bo; Yuan, Feng & Zhou, Jian
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Two recent results on B physics from CDF

Description: Preliminary results from two recent CDF b physics analyses are presented. The first obtains sin(2{beta})=0.79<sup>+0.41</sup><sub>-0.44</sub> from a measurement of the asymmetry in B<sup>0</sup>, {anti B<sup>0</sup>} {yields} J/{psi}K<sup>0</sup><sub>s</sub> decays, providing the best direct indication so far that CP invariance is violated in the b sector. The second obtains new results on the parity even (A<sub>0</sub> and A<sub>{parallel}</sub>) and odd (A<sub>{perpendicular}</sub>) polarizat… more
Date: June 29, 1999
Creator: Schmidt, M. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Flow Tones in a Pipeline-Cavity System: Effect of Pipe Asymmetry

Description: Flow tones in a pipeline-cavity system are characterized in terms of unsteady pressure within the cavity and along the pipe. The reference case corresponds to equal lengths of pipe connected to the inlet and outlet ends of the cavity. Varying degrees of asymmetry of this pipe arrangement are investigated. The asymmetry is achieved by an extension of variable length, which is added to the pipe at the cavity outlet. An extension length as small as a few percent of the acoustic wavelength of the r… more
Date: May 29, 2002
Creator: Erdem, D.; rockwell, D.; Oshkai, P. & Pollack, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Potential-well distortion in barrier Rf

Description: Head-tail asymmetry has been observed in the longitudinal beam profiles in the Fermilab Recycler Ring where protons or antiprotons are stored in rf barrier buckets. The asymmetry is caused by the distortion of the rf potential well in the presence of resistive impedance. Gaussian energy distribution can fit the observed asymmetric beam profile but not without discrepancy. It can also fit the measured energy distribution. On the other hand, generalized elliptic distribution gives a better fit to… more
Date: April 29, 2004
Creator: Ng, King
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A Molecular-Thermodynamic Lattice Model for Binary Mixtures

Description: Using a method originally proposed for describing a continuum-space polymer fluid, a new expression for the Helmholtz energy of mixing is proposed for a binary lattice mixture. Molecular size asymmetry and nonrandomness due to segment-segment interactions are taken into account. An expression proposed by Yan, Liu and Hu for a binary lattice mixture of monomers, based on the Ising model, is used as a reference system. Calculated critical constants and liquid-liquid coexistence curves are in good… more
Date: April 29, 2005
Creator: Qin, Yuan & Prausnitz, John M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Direct Measurement of A{sub b} using Charged Kaons at the SLD Detector

Description: We report a new measurement of A{sub b} using data obtained by SLD in 1997-98. This measurement uses a vertex tag technique, where the selection of a b hemisphere is based on the reconstructed mass of the bottom hadron decay vertex. The method uses the 3D vertexing capabilities of SLD's CCD vertex detector and the small and stable SLC beams to obtain a high b-event tagging efficiency and purity of 78% and 97%, respectively. Charged kaons identified by the CRID detector provide an efficient quar… more
Date: July 29, 1999
Creator: Wright, Thomas R
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Precise Sum Rule among Four B -> K pi CP Asymmetries

Description: A sum rule relation is proposed for direct CP asymmetries in B {yields} K{pi} decays. Leading terms are identical in the isospin symmetry limit, while subleading terms are equal in the flavor SU(3) and heavy quark limits. The sum rule predicts A{sub CP}(B{sup 0} {yields} K{sup 0}{pi}{sup 0}) = -0.17 {+-} 0.06 using current asymmetry measurements for the other three B {yields} K{pi} decays. A violation of the sum rule would be evidence for New Physics in b {yields} s{bar q}q transitions.
Date: August 29, 2005
Creator: Gronau, Michael & /Technion, /SLAC
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Gravitational Lens Time Delays: A Statistical Assessmentof Lens Model Dependences and Implications for the Global Hubble Constant

Description: Time delays between lensed multiple images have been known to provide an interesting probe of the Hubble constant, but such application is often limited by degeneracies with the shape of lens potentials. We propose a new statistical approach to examine the dependence of time delays on the complexity of lens potentials, such as higher-order perturbations, non-isothermality, and substructures. Specifically, we introduce a reduced time delay of the dimensionless form, and explore its behavior anal… more
Date: September 29, 2006
Creator: Oguri, Masamune
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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