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The Gemini-North multiobject spectrograph optical performance

Proceedings of SPIE the International Society for Optical Engineering 4841:3 (2002) 1440-1451

Authors:

R Murowinski, JR Allington-Smith, D Crampton, R Davies, M Fletcher, D Henry, IM Hook, I Jørgensen, S Juneau, C Morbey, J Stilburn, K Szeto

Abstract:

The Gemini Multiobject Spectrographs (GMOS) were designed to take advantage of the exquisite image quality expected of the Gemini telescopes. To achieve this, two of the many requirements placed on the optical system was that it not degrade the best image quality expected of the telescope by more than 10% while delivering a throughput of about 80% over the entire 0.4-1 μm waveband. In this paper, key components of the design and execution of this optical system are discussed and test results are presented demonstrating that it meets these requirements on Gemini today. Among other characteristics, we look at the image quality performance as a function of colour and field angle, the measured throughput, and the focalplane flatness on the detectors.
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Search for radiative b hadron decays in proton anti-proton collisions at s**(1/2) = 1.8-TeV

Physical Review D 66 (2002) 112002 19pp

Authors:

JC Tseng, M Tanaka, K Ragan, F DeJongh
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Measurement of B(D+-->K(*0)l(+)nu(l)).

Phys Rev Lett 89:22 (2002) 222001

Authors:

G Brandenburg, A Ershov, DY-J Kim, R Wilson, K Benslama, BI Eisenstein, J Ernst, GD Gollin, RM Hans, I Karliner, N Lowrey, MA Marsh, C Plager, C Sedlack, M Selen, JJ Thaler, J Williams, KW Edwards, R Ammar, D Besson, X Zhao, S Anderson, VV Frolov, Y Kubota, SJ Lee, SZ Li, R Poling, A Smith, CJ Stepaniak, J Urheim, S Ahmed, MS Alam, L Jian, M Saleem, F Wappler, E Eckhart, KK Gan, C Gwon, T Hart, K Honscheid, D Hufnagel, H Kagan, R Kass, TK Pedlar, JB Thayer, E Von Toerne, T Wilksen, MM Zoeller, SJ Richichi, H Severini, P Skubic, SA Dytman, S Nam, V Savinov, S Chen, JW Hinson, J Lee, DH Miller, V Pavlunin, EI Shibata, IPJ Shipsey, D Cronin-Hennessy, AL Lyon, CS Park, W Park, EH Thorndike, TE Coan, YS Gao, F Liu, Y Maravin, I Narsky, R Stroynowski, J Ye, M Artuso, C Boulahouache, K Bukin, E Dambasuren, R Mountain, T Skwarnicki, S Stone, JC Wang, AH Mahmood, SE Csorna, I Danko, Z Xu, G Bonvicini, D Cinabro, M Dubrovin, S McGee, A Bornheim, E Lipeles, SP Pappas, A Shapiro, WM Sun, AJ Weinstein, G Masek, HP Paar, R Mahapatra, RA Briere, GP Chen, T Ferguson, G Tatishvili, H Vogel, NE Adam, JP Alexander, C Bebek, K Berkelman, F Blanc, V Boisvert, DG Cassel, PS Drell, JE Duboscq, KM Ecklund, R Ehrlich, L Gibbons, B Gittelman, SW Gray, DL Hartill, BK Heltsley, L Hsu, CD Jones, J Kandaswamy, DL Kreinick, A Magerkurth, H Mahlke-Krüger, TO Meyer, NB Mistry, E Nordberg, M Palmer, JR Patterson, D Peterson, J Pivarski, D Riley, AJ Sadoff, H Schwarthoff, MR Shepherd, JG Thayer, D Urner, B Valant-Spaight, G Viehhauser, A Warburton, M Weinberger, SB Athar, P Avery, H Stoeck, J Yelton, CLEO

Abstract:

Using 13.53 fb(-1) of CLEO data, we have measured the ratios of the branching fractions R(+)(e),R(+)(mu) and the combined branching fraction ratio R(+)(l), defined by R(+)(l)=[B(D+-->K(*0)l(+)nu(l))]/[B(D+-->K-pi(+)pi(+))]. We find R(+)(e)=0.74+/-0.04+/-0.05, R(+)(mu)=0.72+/-0.10+/-0.05, and R(+)(l)=0.74+/-0.04+/-0.05, where the first and second errors are statistical and systematic, respectively. The known branching fraction B(D+-->K-pi(+)pi(+)) leads to B(D+-->K(*0)e(+)nu(e))=(6.7+/-0.4+/-0.5+/-0.4)%, B(D+-->K(*0)mu(+)nu(mu))=(6.5+/-0.9+/-0.5+/-0.4)%, and B(D+-->K(*0)l(+)nu(l))=(6.7+/-0.4+/-0.5+/-0.4)%, where the third error is due to the uncertainty in B(D+-->K-pi(+)pi(+)).
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Measurement of B(D+ → K̄*0l+νl)

Physical Review Letters 89:22 (2002) 2220011-2220015

Authors:

G Brandenburg, A Ershov, DYJ Kim, R Wilson, K Benslama, BI Eisenstein, J Ernst, GD Gollin, RM Hans, I Karliner, N Lowrey, MA Marsh, C Plager, C Sedlack, M Selen, JJ Thaler, J Williams, KW Edwards, R Ammar, D Besson, X Zhao, S Anderson, VV Frolov, Y Kubota, SJ Lee, SZ Li, R Poling, A Smith, CJ Stepaniak, J Urheim, S Ahmed, MS Alam, L Jian, M Saleem, F Wappler, E Eckhart, KK Gan, C Gwon, T Hart, K Honscheid, D Hufnagel, H Kagan, R Kass, TK Pedlar, JB Thayer, E von Toerne, T Wilksen, MM Zoeller, SJ Richichi, H Severini, P Skubic, SA Dytman, S Nam, V Savinov, S Chen, JW Hinson, J Lee, DH Miller, V Pavlunin, EI Shibata, IPJ Shipsey, D Cronin-Hennessy, AL Lyon, CS Park, W Park, EH Thorndike, TE Coan, YS Gao, F Liu, Y Maravin, I Narsky, R Stroynowski, J Ye, M Artuso, C Boulahouache, K Bukin, E Dambasuren, R Mountain, T Skwarnicki, S Stone, JC Wang, AH Mahmood, SE Csorna, I Danko, Z Xu, G Bonvicini, D Cinabro, M Dubrovin, S McGee, A Bornheim, E Lipeles, SP Pappas, A Shapiro, WM Sun, AJ Weinstein, G Masek, HP Paar, R Mahapatra, RA Briere, GP Chen

Abstract:

The ratios of the branching fractions and the combined branching fraction ratio was measured. The decay rate measured in this work consisted with the lattice gauge calculations and ISGW2 model prediction. The ratio of the vector and pseudoscalar decay widths was consistent with the predictions of quark models.

Space Telescope Imaging Spectrograph Ultraviolet Spectroscopy of Early B Supergiants in M31**Based on observations with the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.

The Astrophysical Journal American Astronomical Society 580:1 (2002) 213-224

Authors:

Fabio Bresolin, Rolf-Peter Kudritzki, Daniel J Lennon, Stephen J Smartt, Artemio Herrero, Miguel A Urbaneja, Joachim Puls
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