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Search for color singlet technicolor particles in pp¯ Collisions at √s = 1.8TeV

Physical Review Letters 84:6 (2000) 1110-1115

Authors:

T Affolder, H Akimoto, A Akopian, MGG Albrow, P Amaral, SR Amendolia, D Amidei, K Anikeev, J Antos, G Apollinari, T Arisawa, T Asakawa, W Ashmanskas, M Atac, F Azfar, P Azzi-Bacchetta, N Bacchetta, MW Bailey, S Bailey, P De Barbaro, A Barbaro-Galtieri, VE Barnes, BA Barnett, M Barone, G Bauer, F Bedeschi, S Belforte, G Bellettini, J Bellinger, D Benjamin, J Bensinger, A Beretvas, JP Berge, J Berryhill, S Bertolucci, B Bevensee, A Bhatti, C Bigongiari, M Binkley, D Bisello, RE Blair, C Blocker, K Bloom, B Blumenfeld, BS Blusk, A Bocci, A Bodek, W Bokhari, G Bolla, Y Bonushkin, D Bortoletto, J Boudreau, A Brandl, S van den Brink, C Bromberg, M Brozovic, N Bruner, E Buckley-Geer, J Budagov, HS Budd, K Burkett, G Busetto, A Byon-Wagner, KL Byrum, M Campbell, A Caner, W Carithers, J Carlson, D Carlsmith, J Cassada, A Castro, D Cauz, A Cerri, AW Chan, PS Chang, PT Chang, J Chapman, C Chen, YC Chen, MT Cheng, M Chertok, G Chiarelli, I Chirikov-Zorin, G Chlachidze, F Chlebana, L Christofek, ML Chu, S Cihangir, CI Ciobanu, AG Clark, M Cobal, E Cocca, A Connolly, J Conway, J Cooper, M Cordelli, D Costanzo, J Cranshaw, D Cronin-Hennessy, R Cropp

Abstract:

We search for color singlet technirho and technipion production in pp¯ Collisions at √s = 1.8TeVrecorded with the Collider Detector at Fermilab. These exotic technimesons are present in a model of walking technicolor. The signatures studied are lepton plus two jets plus ET and multijet final states. No excess of events is seen in either final state. We set an upper limit on the technirho production cross section and exclude a region in the technipion mass versus technirho mass plane. © 2000 American Physical Society.

Two-Body B Meson Decays to η and η′:Observation of B → ηK*

Physical Review Letters 85:3 (2000) 520-524

Authors:

SJ Richichi, H Severini, P Skubic, A Undrus, S Chen, J Fast, JW Hinson, J Lee, N Menon, DH Miller, EI Shibata, IPJ Shipsey, V Pavlunin, D Cronin-Hennessy, Y Kwon, AL Lyon, EH Thorndike, CP Jessop, H Marsiske, ML Perl, V Savinov, D Ugolini, X Zhou, TE Coan, V Fadeyev, Y Maravin, I Narsky, R Stroynowski, J Ye, T Wlodek, M Artuso, R Ayad, C Boulahouache, K Bukin, E Dambasuren, S Karamnov, S Kopp, G Majumder, GC Moneti, R Mountain, S Schuh, T Skwarnicki, S Stone, G Viehhauser, JC Wang, A Wolf, J Wu, SE Csorna, I Danko, KW McLean, SZ Márka, Z Xu, R Godang, K Kinoshita, IC Lai, S Schrenk, G Bonvicini, D Cinabro, LP Perera, GJ Zhou, G Eigen, E Lipeles, M Schmidtler, A Shapiro, WM Sun, AJ Weinstein, F Würthwein, DE Jaffe, G Masek, HP Paar, EM Potter, S Prell, V Sharma, DM Asner, A Eppich, J Gronberg, TS Hill, DJ Lange, RJ Morrison, HN Nelson, RA Briere, BH Behrens, WT Ford, A Gritsan, H Krieg, J Roy, JG Smith, JP Alexander, R Baker, C Bebek, BE Berger, K Berkelman, F Blanc, V Boisvert, DG Cassel, M Dickson, PS Drell, KM Ecklund, R Ehrlich, AD Foland

Abstract:

In a sample of 19 × 106 produced B mesons, we have observed the decays B → ηK∗ and improved our previous measurements of B → η′K. The branching fractions we measure for these decay modes are B(B+ → ηK*+) = (26.4+9.6−8.2 ± 3.3) × 10−6, B(B0 → η K*0) = (13.8+5.5−4.6 ± 1.6) × 10−6, B (B+ → η′ K+) = (80+10−9 ± 7) × 10−6, and B (B0 → η′ K0) = (89+18−16 ± 9) × 10−6. We have searched with comparable sensitivity for related decays and report upper limits for these branching fractions. © 2000 American Physical Society.

Infrared spectrum of an extremely cool white-dwarf star

Nature Springer Nature 403:6765 (2000) 57-59

Authors:

ST Hodgkin, BR Oppenheimer, NC Hambly, RF Jameson, SJ Smartt, IA Steele

Abundance Determinations in Massive Blue Stars Within the Local Group

Chapter in From Extrasolar Planets to Cosmology: The VLT Opening Symposium, Springer Nature (2000) 331-337

Authors:

Artemio Herrero, Rolf-Peter Kudritzki, Stephen J Smartt, Kim Venn, Norbert Przybilla, Daniel J Lennon, James K McCarthy, M Ilusión Monteverde

Abundance Gradients Along the Galactic Disk

Chapter in The Evolution of The Milky Way, Springer Nature 255 (2000) 323-334