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First observation of a Υ(1D) state

Physical Review D - Particles, Fields, Gravitation and Cosmology 70:3 (2004)

Authors:

G Bonvicini, D Cinabro, M Dubrovin, A Bornheim, E Lipeles, SP Pappas, A Shapiro, AJ Weinstein, RA Briere, GP Chen, T Ferguson, G Tatishvili, H Vogel, ME Watkins, NE Adam, JP Alexander, K Berkelman, V Boisvert, DG Cassel, JE Duboscq, KM Ecklund, R Ehrlich, RS Galik, L Gibbons, B Gittelman, SW Gray, DL Hartill, BK Heltsley, L Hsu, CD Jones, J Kandaswamy, DL Kreinick, VE Kuznetsov, A Magerkurth, H Mahlke-Krüger, TO Meyer, JR Patterson, TK Pedlar, D Peterson, J Pivarski, D Riley, JL Rosner, AJ Sadoff, H Schwarthoff, MR Shepherd, WM Sun, JG Thayer, D Urner, T Wilksen, M Weinberger, SB Athar, P Avery, L Breva-Newell, V Potlia, H Stoeck, J Yelton, BI Eisenstein, GD Gollin, I Karliner, N Lowrey, P Naik, C Sedlack, M Selen, JJ Thaler, J Williams, KW Edwards, D Besson, KY Gao, DT Gong, Y Kubota, SZ Li, R Poling, AW Scott, A Smith, CJ Stepaniak, J Urheim, Z Metreveli, KK Seth, A Tomaradze, P Zweber, J Ernst, K Arms, E Eckhart, KK Gan, C Gwon, H Severini, P Skubic, DM Asner, SA Dytman, S Mehrabyan, JA Mueller, S Nam, V Savinov, GS Huang, DH Miller, V Pavlunin, B Sanghi, EI Shibata, IPJ Shipsey, GS Adams

Abstract:

We present the first evidence for the production of Υ(1D) states in the four-photon cascade, Υ(3S) →γχb(2P), χb(2P)→γΥ(1D), Υ(1D) →γχb(1P), χb(1P)→γΥ(1S) , followed by the Υ(1S) annihilation into e+e- or μ+μ-. The signal has a significance of 10.2 standard deviations. The measured product branching ratio for these five decays, (2.5±0.5±0.5)×10-5, is consistent with the theoretical estimates. The data are dominated by the production of one Υ(1D) state consistent with the J=2 assignment. Its mass is determined to be (10161.1±0.6±1.6) MeV, which is consistent with the predictions from potential models and lattice QCD calculations. We also searched for Υ(3S)→γχb(2P), χb(2P) →γΥ(1D), followed by either Υ(1D)→ηΥ(1S) or Υ(1D)→π+π-Υ(1S). We find no evidence for such decays and set upper limits on the product branching ratios.

Measurement of the polar-angle distribution of leptons from W boson decay as a function of the W transverse momentum in pp̄ collisions at √s=1.8 TeV

Physical Review D Particles Fields Gravitation and Cosmology 70:3 (2004) 1-32004

Authors:

D Acosta, T Affolder, MG Albrow, D Ambrose, D Amidei, K Anikeev, J Antos, G Apollinari, T Arisawa, A Artikov, W Ashmanskas, F Azfar, P Azzi-Bacchetta, N Bacchetta, H Bachacou, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, S Baroiant, M Barone, G Bauer, F Bedeschi, S Behari, S Belforte, WH Bell, G Bellettini, J Bellinger, D Benjamin, A Beretvas, A Bhatti, M Binkley, D Bisello, M Bishai, RE Blair, C Blocker, K Bloom, B Blumenfeld, A Bocci, A Bodek, G Bolla, A Bolshov, D Bortoletto, J Boudreau, C Bromberg, E Brubaker, J Budagov, HS Budd, K Burkett, G Busetto, KL Byrum, S Cabrera, M Campbell, W Carithers, D Carlsmith, A Castro, D Cauz, A Cerri, L Cerrito, J Chapman, C Chen, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, ML Chu, JY Chung, WH Chung, YS Chung, CI Ciobanu, AG Clark, M Coca, A Connolly, M Convery, J Conway, M Cordelli, J Cranshaw, R Culbertson, D Dagenhart, S D'Auria, P de Barbaro, S de Cecco, S Dell'Agnello, M Dell'Orso, S Demers, L Demortier, M Deninno, D de Pedis, PF Derwent, C Dionisi, JR Dittmann, A Dominguez, S Donati, M D'Onofrio, T Dorigo, N Eddy, R Erbacher, D Errede, S Errede

Abstract:

We present a measurement of the polar-angle distribution of leptons from W boson decay, as a function of the W transverse momentum. The measurement uses an 80±4 pb-1 sample of pp̄ collisions at √s = 1.8 TeV collected by the CDF detector and includes data from both the W→e+ν and W→μ+ν decay channels. We fit the W boson transverse mass distribution to a set of templates from a Monte Carlo event generator and detector simulation in several ranges of the W transverse momentum. The measurement agrees with the standard model expectation, whereby the ratio of longitudinally to transversely polarized W bosons, in the Collins-Soper W rest frame, increases with the W transverse momentum at a rate of approximately 15% per 10 GeV/c.

Optimized evaporative cooling using a dimple potential: An efficient route to Bose-Einstein condensation

Journal of Physics B: Atomic, Molecular and Optical Physics 37:15 (2004) 3187-3195

Authors:

ZY Ma, CJ Foot, SL Cornish

Abstract:

The realization of Bose-Einstein condensation of 133Cs relies on an innovative evaporative cooling technique using a dimple potential. Correctly loading an atomic gas into such a potential produces a dense sample with a high phase space density, ideal for evaporative cooling. We have numerically simulated both the loading process and the subsequent evaporative cooling from a dimple potential in order to elucidate the optimization of this technique. Furthermore, we demonstrate that this technique would be effective in cooling 85Rb to quantum degeneracy and describe a simple scheme for its implementation.

Observation of the narrow state X(3872) → J/ψπ+π- in p̄p collisions at √s = 1.96 TeV

Physical Review Letters 93:7 (2004)

Authors:

D Acosta, T Affolder, MH Ahn, T Akimoto, MG Albrow, D Ambrose, S Amerio, D Amidei, A Anastassov, K Anikeev, A Annovi, J Antos, M Aoki, G Apollinari, JF Arguin, T Arisawa, A Artikov, T Asakawa, W Ashmanskas, A Attal, F Azfar, P Azzi-Bacchetta, N Bacchetta, H Bachacou, W Badgett, S Bailey, A Barbaro-Galtieri, G Barker, VE Barnes, BA Barnett, S Baroiant, M Barone, G Bauer, F Bedeschi, S Behari, S Belforte, WH Bell, G Bellettini, J Bellinger, D Benjamin, A Beretvas, A Bhatti, M Binkley, D Bisello, M Bishai, RE Blair, C Blocker, K Bloom, B Blumenfeld, A Bocci, A Bodek, G Bolla, A Bolshov, PSL Booth, D Bortoletto, J Boudreau, S Bourov, C Bromberg, E Brubaker, J Budagov, HS Budd, K Burkett, G Busetto, P Bussey, KL Byrum, S Cabrera, P Calafiura, M Campanelli, M Campbell, A Canepa, D Carlsmith, S Carron, R Carosi, M Casarsa, A Castro, P Catastini, D Cauz, A Cerri, C Cerri, L Cerrito, J Chapman, C Chen, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, K Cho, D Chokheli, ML Chu, JY Chung, WH Chung, YS Chung, CI Ciobanu, MA Ciocci, AG Clark, D Clark, MN Coca, A Connolly, ME Convery

Abstract:

The observation of a state consistent with X(3872) decaying into J/ψπ+π- was reported. The X(3872) mass was measured to be 3871.3±0.7(stat)±0.4(syst)MeV/c2 from a sample of 730±90 candidates. The observed width was consistent with the detector resolution. The results were found to be converging well with the measurements by the Belle Collaboration using b± decays.

Sensors for the CDF Run2b Silicon Detector

IEEE Transactions on Nuclear Science Institute of Electrical and Electronics Engineers (IEEE) 51:4 (2004) 1546-1554

Authors:

T Akimoto, M Aoki, P Azzi, N Bacchetta, S Behari, D Benjamin, D Bisello, G Bolla, P Booth, D Bortoletto, A Burghard, G Busetto, S Cabrera, A Canepa, G Cardoso, M Chertok, CI Ciobanu, P Cooke, G Derylo, I Fang, EJ Feng, JP Fernandez, B Flaugher, J Freeman, L Galtieri, J Galyardt, Garcia-Sciveres M., G Giurgiu, I Gorelov, C Haber, D Hale, K Hara, R Harr, C Hill, M Hoeferkamp, J Hoff, B Holbrook, SC Hong, M Hrycyk, TH Hsiung, J Incandela, EJ Jeon, KK Joo, T Junk, H Kahkola, S Karjalainen, S Kim, K Kobayashi, DJ Kong, B Krieger, M Kruse, S Kyre, R Lander, T Landry, R Lauhakangas, J Lee, Lu R.-S., PJ Lujan, P Lukens, E Mandelli, C Manea, P Maksimovic, P Merkel, SN Min, S Moccia, Y Nakamura, I Nakano, D Naoumov, T Nelson, B Nord, J Novak, T Okusawa, R Orava, Y Orlov, K Osterberg, D Pantano, V Pavlicek, D Pellett, J Pursley, P Riipinen, B Schuyler, S Seidel, A Shenai, A Soha, D Stuart, R Tanaka, M Tavi, H Von der Lippe, Walder J.-P., Z Wang, P Watje, M Weber, W Wester, K Yamamoto, YC Yang, W Yao, W Yao, R Yarema, H Yoshitama, JC Yun, F Zetti, T Zimmerman, S Zimmermann, S Zucchelli