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Observation of η′c production in γγ fusion at CLEO

Physical Review Letters 92:14 (2004)

Authors:

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, M Chasse, JP Cummings, I Danko, J Napolitano, D Cronin-Hennessy, CS Park, W Park, JB Thayer, EH Thorndike, TE Coan, YS Gao, F Liu, R Stroynowski, M Artuso, C Boulahouache, S Blusk, J Butt, E Dambasuren, O Dorjkhaidav, J Haynes, N Menaa, R Mountain, H Muramatsu, R Nandakumar, R Redjimi, R Sia, T Skwarnicki, S Stone, JC Wang, K Zhang, AH Mahmood, SE Csorna, G Bonvicini, D Cinabro, M Dubrovin, A Bornheim, E Lipeles, SP Pappas, A Shapiro, AJ Weinstein, R Mahapatra, HN Nelson, 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, 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

Abstract:

The production of η′c in two-photon γγ fusion reaction at CLEO was investigated. The spin dependence of Cornell potential along with spin-orbit, spin-spin and tensor components was assumed to occur from the vector Coulombic part. The confinement potential was assumed to be scalar with minimal spin-orbit contribution which was observed due to Thomas precession. The production via two-photon fusion and four-charged particles was ensured by total transverse momentum.

Cabibbo-suppressed decays of D+→π+π0,K+K0,K+π0

Physical Review D American Physical Society (APS) 69:7 (2004) 071102

Authors:

K Arms, E Eckhart, KK Gan, C Gwon, K Honscheid, R Kass, H Severini, P Skubic, SA Dytman, JA Mueller, S Nam, V Savinov, GS Huang, J Lee, DH Miller, V Pavlunin, B Sanghi, EI Shibata, IPJ Shipsey, D Cronin-Hennessy, CS Park, W Park, JB Thayer, EH Thorndike, TE Coan, YS Gao, F Liu, R Stroynowski, M Artuso, C Boulahouache, S Blusk, E Dambasuren, O Dorjkhaidav, R Mountain, H Muramatsu, R Nandakumar, T Skwarnicki, S Stone, JC Wang, AH Mahmood, SE Csorna, I Danko, G Bonvicini, D Cinabro, M Dubrovin, A Bornheim, E Lipeles, SP Pappas, A Shapiro, WM Sun, 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, A Magerkurth, H Mahlke-Krüger, TO Meyer, NB Mistry, JR Patterson, TK Pedlar, D Peterson, J Pivarski, SJ Richichi, D Riley, AJ Sadoff, H Schwarthoff, MR Shepherd, JG Thayer, D Urner, T Wilksen, A Warburton, M Weinberger, SB Athar, P Avery, L Breva-Newell, V Potlia, H Stoeck, J Yelton, BI Eisenstein, GD Gollin, I Karliner, N Lowrey, C Plager, C Sedlack, M Selen, JJ Thaler, J Williams, KW Edwards, D Besson, VV Frolov, 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

The environments of hyperluminous infrared galaxies at 0.44 < z < 1.55

Monthly Notices of the Royal Astronomical Society 349:2 (2004) 518-526

Authors:

D Farrah, J Geach, M Fox, S Serjeant, S Oliver, A Verma, A Kaviani, M Rowan-Robinson

Abstract:

We present deep wide-field Ks-band observations of six Hyperluminous Infrared Galaxies (HLIRGs) spanning a redshift range 0.44 < z < 1.55. The sample resides in a wide variety of environments, from the field to Abell 2 clusters, with a mean galaxy-HLIRG clustering amplitude of 〈Bgh〉 = 190 ± 45 Mpc1.77. The range in environments, and the mean clustering level, are both greater than those seen in local IR-luminous galaxies, from which we infer that the range of galaxy evolution processes driving IR-luminous galaxy evolution at z > 0.5 is greater than locally, and includes mergers between gas-rich spiral galaxies in the field, but also includes encounters in clusters and hierarchical build-up. The similarity in the range of environments and mean clustering amplitude between our sample and QSOs over a similar redshift range is consistent with the interpretation where evolutionary connections between IR-luminous galaxies and QSOs are stronger at z > 0.5 than locally, and that, at these redshifts, the processes that drive QSO evolution are similar to those that drive IR-luminous galaxy evolution. From comparison of the HLIRG and QSO host galaxies we further postulate that a larger fraction of IR-luminous galaxies pass through an optical QSO stage at z > 0.5 than locally.

Simultaneous radio and X-ray observations of the low-mass X-ray binary GX 13+1

Astronomy & Astrophysics EDP Sciences 418:1 (2004) 255-263

Authors:

J Homan, R Wijnands, MP Rupen, R Fender, RM Hjellming, T di Salvo, M van der Klis

Search for Kaluza-Klein graviton emission in pp̄ collisions at √s = 1.8 TeV using the missing energy signature

Physical Review Letters 92:12 (2004) 1-121802

Authors:

D Acosta, T Affolder, H Akimoto, MG Albrow, D Ambrose, D Amidei, K Anikeev, J Antos, G Apollinari, T Arisawa, A Artikov, T Asakawa, W Ashmanskas, F Azfar, P Azzi-Bacchetta, N Bacchetta, H Bachacou, W Badgett, S Bailey, P de Barbaro, 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, J Bensinger, A Beretvas, J Berryhill, A Bhatti, M Binkley, D Bisello, M Bishai, RE Blair, C Blocker, K Bloom, B Blumenfeld, SR Blusk, A Bocci, A Bodek, G Bolla, A Bolshov, Y Bonushkin, D Bortoletto, J Boudreau, A Brandl, C Bromberg, M Brozovic, E Brubaker, N Bruner, J Budagov, HS Budd, K Burkett, G Busetto, KL Byrum, S Cabrera, P Calafiura, M Campbell, W Carithers, J Carlson, D Carlsmith, W Caskey, A Castro, D Cauz, A Cerri, L Cerrito, 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, 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

Abstract:

The results of a search for the direct production of Kaluza-Klein (KK) graviton modes using the rate of events with one or two energetic jets and large ET at the Collider Detector at Fermilab (CFD) were reported. The search was based on 84±4 pb-1 of integrated luminosity recorded with the CDF detector. The final state of large missing transverse energy and one or two high energy jets was also investigated. The calculation of graviton emission was based on the effective low-energy theory that was valid below the scale MD.