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in publisher: "SLAC National Accelerator Laboratory"  
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Study of B to X \gamma Decays and Determination of |V_{td}/V_{ts}|

Description: Using a sample of 471 million B{bar B} events collected with the BABAR detector, we study the sum of seven exclusive final states B {yields} X{sub s(d){gamma}}, where X{sub s(d)} is a strange (non-strange) hadronic system with a mass of up to 2.0 GeV/c{sup 2}. After correcting for unobserved decay modes, we obtain a branching fraction for b {yields} d{gamma} of (9.2 {+-} 2.0(stat.) {+-} 2.3(syst.)) x 10{sup -6} in this mass range, and a branching fraction for b {yields} s{gamma} of (23.0 {+-} 0… more
Date: August 22, 2011
Creator: del Amo Sanchez, P.; Lees, J. P.; Poireau, V.; Prencipe, E.; Tisserand, V.; Garra Tico, J. et al.
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Partner: UNT Libraries Government Documents Department
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Search for fj(2220) in radiative J/psi decays

Description: We present a search for f{sub J}(2220) production in radiative J/{psi} {yields} {gamma}f{sub J}(2220) decays using 460 fb{sup -1} of data collected with the BABAR detector at the SLAC PEP-II e{sup +}e{sup -} collider. The f{sub J}(2220) is searched for in the decays to K{sup +}K{sup -} and K{sub S}{sup 0}K{sub S}{sup 0}. No evidence of this resonance is observed, and 90% confidence level upper limits on the product of the branching fractions for J/{psi} {yields} {gamma}f{sub J}(2220) and f{sub … more
Date: July 30, 2010
Creator: del Amo Sanchez, P.; Lees, J. P.; Poireau, V.; Prencipe, E.; Tisserand, V.; Garra Tico, J. et al.
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Partner: UNT Libraries Government Documents Department
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Search for B+ meson decay to a1+ K*0

Description: We present a search for the decay B{sup +} --> {alpha}{sup +}{sub 1}(1260)K*{sup 0}(892). The data, collected with the BABAR detector at the SLAC National Accelerator Laboratory, represent 465 million B{anti B} pairs produced in e{sup +}e{sup -} annihilation at the energy of the {Upsilon}(4S). We find no significant signal and set an upper limit at 90% confidence level on the product of branching fractions B(B{sup +} --> {alpha}{sup +}{sub 1}(1260)K*{sup 0}(892)) x B({alpha}{sup +}{sub 1}… more
Date: August 11, 2011
Creator: del Amo Sanchez, P.; Lees, J. P.; Poireau, V.; Prencipe, E.; Tisserand, V.; Garra Tico, J. et al.
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Partner: UNT Libraries Government Documents Department
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Multiphysics Applications of ACE3P

Description: The TEM3P module of ACE3P, a parallel finite-element electromagnetic code suite from SLAC, focuses on the multiphysics simulation capabilities, including thermal and mechanical analysis for accelerator applications. In this pa- per, thermal analysis of coupler feedthroughs to supercon- ducting rf (SRF) cavities will be presented. For the realistic simulation, internal boundary condition is implemented to capture RF heating effects on the surface shared by a di- electric and a conductor. The mul… more
Date: July 1, 2012
Creator: Lee, Ki H.; Ko, Kwok; Li, Zenghai; Ng, Cho-Kuen; Xiao, Liling; Cheng, G. et al.
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Partner: UNT Libraries Government Documents Department
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Higher Order Modes Damping Analysis for the SPX Deflecting Cavity Cryomodule

Description: A single-cell superconducting deflecting cavity operating at 2.812 GHz has been proposed and designed for the Short Pulse X-ray (SPX) project for the Advanced Photon Source upgrade. A cryomodule of 4 such cavities will be needed to produce the required 2-MV deflecting voltage. Each deflecting cavity is equipped with one fundamental power coupler (FPC), one lower order mode (LOM) coupler, and two higher order mode (HOM) couplers to achieve the stringent damping requirements for the unwanted mode… more
Date: July 1, 2012
Creator: Xiao, L.; Li, Z.; Ng, C. K.; Nassiri, A.; Waldschmidt, G.; Wu, G. et al.
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Partner: UNT Libraries Government Documents Department
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Status of the Short-Pulse X-ray Project at the Advanced Photon Source

Description: The Advanced Photon Source Upgrade (APS-U) Project at Argonne will include generation of short-pulse x-rays based on Zholents deflecting cavity scheme. We have chosen superconducting (SC) cavities in order to have a continuous train of crabbed bunches and flexibility of operating modes. In collaboration with Jefferson Laboratory, we are prototyping and testing a number of single-cell deflecting cavities and associated auxiliary systems with promising initial results. In collaboration with Lawre… more
Date: July 2012
Creator: Nassiri, A.; Berenc, T. G.; Borland, M.; Brajuskovic, B.; Bromberek, D. J.; Carwardine, J. et al.
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Partner: UNT Libraries Government Documents Department
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Accelerator R&D: Research for Science - Science for Society

Description: In September 2011 the US Senate Appropriations Committee requested a ten-year strategic plan from the Department of Energy (DOE) that would describe how accelerator R&D today could advance applications directly relevant to society. Based on the 2009 workshop 'Accelerators for America's Future' an assessment was made on how accelerator technology developed by the nation's laboratories and universities could directly translate into a competitive strength for industrial partners and a variety … more
Date: July 2012
Creator: Holtkamp, N.; Biedron, S.; Boeh, L.; Clayton, J.; Gourlay, S.; Hamm, R. et al.
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Partner: UNT Libraries Government Documents Department
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