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Evidence for decays of hc to multipion final states

Physical Review D Particles Fields Gravitation and Cosmology 80:5 (2009)

Authors:

GS Adams, D Hu, B Moziak, J Napolitano, KM Ecklund, Q He, J Insler, H Muramatsu, CS Park, EH Thorndike, F Yang, M Artuso, S Blusk, S Khalil, R Mountain, K Randrianarivony, T Skwarnicki, S Stone, JC Wang, LM Zhang, G Bonvicini, D Cinabro, A Lincoln, MJ Smith, P Zhou, J Zhu, P Naik, J Rademacker, DM Asner, KW Edwards, J Reed, AN Robichaud, G Tatishvili, EJ White, RA Briere, H Vogel, PUE Onyisi, JL Rosner, JP Alexander, DG Cassel, R Ehrlich, L Fields, L Gibbons, SW Gray, DL Hartill, BK Heltsley, JM Hunt, J Kandaswamy, DL Kreinick, VE Kuznetsov, J Ledoux, H Mahlke-Krüger, JR Patterson, D Peterson, D Riley, A Ryd, AJ Sadoff, X Shi, S Stroiney, WM Sun, T Wilksen, J Yelton, P Rubin, N Lowrey, S Mehrabyan, M Selen, J Wiss, M Kornicer, RE Mitchell, MR Shepherd, CM Tarbert, D Besson, TK Pedlar, J Xavier, D Cronin-Hennessy, KY Gao, J Hietala, T Klein, R Poling, P Zweber, S Dobbs, Z Metreveli, KK Seth, BJY Tan, A Tomaradze, S Brisbane, J Libby, L Martin, A Powell, C Thomas, G Wilkinson, H Mendez, JY Ge, DH Miller, IPJ Shipsey, B Xin

Abstract:

Using a sample of 2.59×107 ψ(2S) decays collected by the CLEO-c detector, we present results of a search for the decay chain ψ(2S)→π0hc, hc→n(π+π-)π0, n=1, 2, 3. We observe no significant signals for n=1 and n=3 and set upper limits for the corresponding decay rates. First evidence for the decay hc→π+π-π+π-π0 is presented, and a product branching fraction of B(ψ(2S)→hcπ0) ×B(hc→2(π+π-)π0)=1.88-0.45-0.30+0.48+0.47×10-5 is measured. This result implies that hc→hadrons and hc→γηc have comparable rates, in agreement with expectations. © 2009 The American Physical Society.
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Galaxy Zoo: Exploring the Motivations of Citizen Science Volunteers

ArXiv 0909.2925 (2009)

Authors:

M Jordan Raddick, Georgia Bracey, Pamela L Gay, Chris J Lintott, Phil Murray, Kevin Schawinski, Alexander S Szalay, Jan Vandenberg

Abstract:

The Galaxy Zoo citizen science website invites anyone with an Internet connection to participate in research by classifying galaxies from the Sloan Digital Sky Survey. As of April 2009, more than 200,000 volunteers had made more than 100 million galaxy classifications. In this paper, we present results of a pilot study into the motivations and demographics of Galaxy Zoo volunteers, and define a technique to determine motivations from free responses that can be used in larger multiple-choice surveys with similar populations. Our categories form the basis for a future survey, with the goal of determining the prevalence of each motivation.
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Probing the behaviour of the X-ray binary Cygnus X-3 with very-long-baseline radio interferometry

(2009)

Authors:

V Tudose, JCA Miller-Jones, RP Fender, Z Paragi, C Sakari, A Szostek, MA Garrett, V Dhawan, A Rushton, RE Spencer, M van der Klis
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'Disc-jet' coupling in black hole X-ray binaries and active galactic nuclei

(2009)
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Following the 2008 outburst decay of the black hole candidate H1743-322 in X-ray and radio

(2009)

Authors:

PG Jonker, J Miller-Jones, J Homan, E Gallo, M Rupen, J Tomsick, RP Fender, P Kaaret, DTH Steeghs, MAP Torres, R Wijnands, S Markoff, WHG Lewin
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