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Radio flares and plasmon size in Cygnus X-3

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 326:1 (2001) 349-357

Authors:

RN Ogley, SJ Bell Burnell, RE Spencer, SJ Newell, AM Stirling, RP Fender
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VLT optical observations of V821 Ara(=GX339-4) in an extended "off" state*

Astronomy & Astrophysics EDP Sciences 376:2 (2001) l17-l21

Authors:

T Shahbaz, R Fender, PA Charles
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Measurement of the decay asymmetry parameters in Ξ c0 → Ξ - π +

Physical Review D - Particles, Fields, Gravitation and Cosmology 63:11 (2001) 1111021-1111026

Authors:

M Bishai, J Fast, E Gerndt, JW Hinson, RL McIlwain, T Miao, DH Miller, M Modesitt, D Payne, EI Shibata, IPJ Shipsey, PN Wang, M Battle, J Ernst, L Gibbons, Y Kwon, S Roberts, EH Thorndike, CH Wang, J Dominick, M Lambrecht, S Sanghera, V Shelkov, T Skwarnicki, R Stroynowski, I Volobouev, G Wei, M Artuso, M Gao, M Goldberg, D He, N Horwitz, GC Moneti, R Mountain, F Muheim, Y Mukhin, S Playfer, Y Rozen, S Stone, X Xing, G Zhu, J Bartelt, SE Csorna, Z Egyed, V Jain, D Gibaut, K Kinoshita, P Pomianowski, B Barish, M Chadha, S Chan, DF Cowen, G Eigen, JS Miller, C O'Grady, J Urheim, AJ Weinstein, M Athanas, W Brower, G Masek, HP Paar, J Gronberg, CM Korte, R Kutschke, S Menary, RJ Morrison, S Nakanishi, HN Nelson, TK Nelson, C Qiao, JD Richman, A Ryd, D Sperka, H Tajima, MS Witherell, M Procario, R Balest, K Cho, WT Ford, DR Johnson, K Lingel, M Lohner, P Rankin, JG Smith, JP Alexander, C Bebek, K Berkelman, K Bloom, TE Browder, DG Cassel, HA Cho, DM Coffman, DS Crowcroft, PS Drell, DJ Dumas, R Ehrlich, P Gaidarev, M Garcia-Sciveres, B Geiser, B Gittelman

Abstract:

Using the CLEO II detector at the Cornell Electron Storage Ring we have measured the Ξ c0 decay asymmetry parameter in the decay Ξ 0c→ Ξ - π +. We find α Ξc0 = 0.26±0.18(stat) -0.04+0.05(syst); using the world average value of α Ξ = -0.456±0.014 we obtain α Ξc0 = -0.56±0.39(stat) -0.09+0.10(syst). The physically allowed range of a decay asymmetry parameter is -1 < α < + 1. Our result prefers a negative value: α Ξc0 is <0.1 at the 90% C.L. The central value occupies the middle of the theoretically expected range but is not yet precise enough to choose between models.

Optical and infrared spectroscopy of the type IIn SN 1998S: days 3–127

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 325:3 (2001) 907-930

Authors:

A Fassia, WPS Meikle, N Chugai, TR Geballe, P Lundqvist, NA Walton, D Pollacco, S Veilleux, GS Wright, M Pettini, T Kerr, E Puchnarewicz, P Puxley, M Irwin, C Packham, SJ Smartt, D Harmer
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Experimental investigation of the two-photon widths of the chi(c0) and the chi(c2) mesons.

Physical review letters 87:6 (2001) 061801

Authors:

BI Eisenstein, J Ernst, GE Gladding, GD Gollin, RM Hans, E Johnson, I Karliner, MA Marsh, C Plager, C Sedlack, M Selen, JJ Thaler, J Williams, KW Edwards, AJ Sadoff, R Ammar, A Bean, D Besson, X Zhao, S Anderson, VV Frolov, Y Kubota, SJ Lee, R Poling, A Smith, CJ Stepaniak, J Urheim, S Ahmed, MS Alam, SB Athar, L Jian, L Ling, M Saleem, S Timm, F Wappler, A Anastassov, E Eckhart, KK Gan, C Gwon, T Hart, K Honscheid, D Hufnagel, H Kagan, R Kass, TK Pedlar, JB Thayer, E von Toerne, MM Zoeller, SJ Richichi, H Severini, P Skubic, A Undrus, V Savinov, S Chen, JW Hinson, J Lee, DH Miller, EI Shibata, IP Shipsey, V Pavlunin, D Cronin-Hennessy, AL Lyon, EH Thorndike, TE Coan, V Fadeyev, YS Gao, Y Maravin, I Narsky, R Stroynowski, J Ye, T Wlodek, M Artuso, K Benslama, C Boulahouache, K Bukin, E Dambasuren, G Majumder, R Mountain, T Skwarnicki, S Stone, JC Wang, A Wolf, S Kopp, M Kostin, AH Mahmood, SE Csorna, I Danko, KW McLean, Z Xu, R Godang, G Bonvicini, D Cinabro, M Dubrovin, S McGee, A Bornheim, E Lipeles, SP Pappas, A Shapiro, WM Sun, AJ Weinstein, DE Jaffe, R Mahapatra, G Masek, HP Paar, DM Asner, A Eppich, TS Hill, RJ Morrison, RA Briere, GP Chen, T Ferguson, H Vogel, JP Alexander, C Bebek, BE Berger, K Berkelman, F Blanc, V Boisvert, DG Cassel, PS Drell, JE Duboscq, KM Ecklund, R Ehrlich, P Gaidarev, RS Galik, L Gibbons, B Gittelman, SW Gray, DL Hartill, BK Heltsley, L Hsu, CD Jones, J Kandaswamy, DL Kreinick, M Lohner, A Magerkurth, H Mahlke-Krüger, TO Meyer, NB Mistry, E Nordberg, M Palmer, JR Patterson, D Peterson, D Riley, A Romano, H Schwarthoff, JG Thayer, D Urner, B Valant-Spaight, G Viehhauser, A Warburton, P Avery, C Prescott, AI Rubiera, H Stoeck, J Yelton, G Brandenburg, A Ershov, DY Kim, R Wilson

Abstract:

Using 12.7 fb(-1) of data collected with the CLEO detector at CESR, we observed two-photon production of the cc states chi(c0) and chi(c2) in their decay to pi(+)pi(-)pi(+)pi(-). We measured gamma(gammagamma)(chi(c))xB(chi(c)-->pi(+)pi(-)pi(+)pi(-)) to be 75+/-13(stat)+/-8(syst) eV for the chi(c0) and 6.4+/-1.8(stat)+/-0.8(syst) eV for the chi(c2), implying gamma(gammagamma)(chi(c0)) = 3.76+/-0.65(stat)+/-0.41(syst)+/-1.69(br) keV and gamma(gammagamma)(chi(c2)) = 0.53+/-0.15(stat)+/-0.06(syst)+/-0.22(br) keV. Also, cancellation of dominant experimental and theoretical uncertainties permits a precise comparison of gamma(gammagamma)(chi(c0))/gamma(gammagamma)(chi(c2)), evaluated to be 7.4+/-2.4(stat)+/-0.5(syst)+/-0.9(br), with QCD-based predictions.
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