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Search for the flavor-changing neutral current decay Bs 0 → μ+ μ- pp̄ Collisions at √s = 1.96 TeV with the DO Detector

Physical Review Letters 94:7 (2005)

Authors:

VM Abazov, B Abbott, M Abolins, BS Acharya, M Adams, T Adams, M Agelou, JL Agram, SH Ahn, M Ahsan, GD Alexeev, G Alkhazov, A Alton, G Alverson, GA Alves, M Anastasoaie, S Anderson, B Andrieu, Y Arnoud, A Askew, B Åsman, O Atramentov, C Autermann, C Avila, F Badaud, A Baden, B Baldin, PW Balm, S Banerjee, E Barberis, P Bargassa, P Baringer, C Barnes, J Barreto, JF Bartlett, U Bassler, D Bauer, A Bean, S Beauceron, M Begel, A Bellavance, SB Beri, G Bernardi, R Bernhard, I Bertram, M Besançon, R Beuselinck, VA Bezzubov, PC Bhat, V Bhatnagar, M Binder, KM Black, I Blackler, G Blazey, F Blekman, S Blessing, D Bloch, U Blumenschein, A Boehnlein, O Boeriu, TA Bolton, F Borcherding, G Borissov, K Bos, T Bose, A Brandt, R Brock, G Brooijmans, A Bross, NJ Buchanan, D Buchholz, M Buehler, V Buescher, S Burdin, TH Burnett, E Busato, JM Butler, J Bystricky, W Carvalho, BCK Casey, NM Cason, H Castilla-Valdez, S Chakrabarti, D Chakraborty, KM Chan, A Chandra, D Chapin, F Charles, E Cheu, L Chevalier, DK Cho, S Choi, T Christiansen, L Christofek, D Claes, B Clément, C Clément, Y Coadou, M Cooke, WE Cooper

Abstract:

We present the results of a search for the flavor-changing neutral current decay Bs0 → μ+ μ-. using a data set with integrated luminosity of 240 pb-1 of pp̄ collisions at √s = 1.96 TeV collected with the D0 detector in run II of the Fermilab Tevatron collider. We find the upper limit on the branching fraction to be B(Bs0 → μ+ π-) ≤ 5.0 × 10-7 at the 95% C.L. assuming no contributions from the decay Bd0 → μ+ μ- in the signal region. This limit is the most stringent upper bound on the branching fraction Bs0 → μ+ μ- to date. © 2005 The American Physical Society.
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Measurement of Wgamma and Zgamma production in pp collisions at square root s=1.96 TeV.

Phys Rev Lett 94:4 (2005) 041803

Authors:

D Acosta, J Adelman, T Affolder, T Akimoto, MG Albrow, D Ambrose, S Amerio, D Amidei, A Anastassov, K Anikeev, A Annovi, J Antos, M Aoki, G Apollinari, T Arisawa, J-F Arguin, A Artikov, W Ashmanskas, A Attal, F Azfar, P Azzi-Bacchetta, N Bacchetta, H Bachacou, W Badgett, A Barbaro-Galtieri, GJ Barker, VE Barnes, BA Barnett, S Baroiant, M Barone, G Bauer, F Bedeschi, S Behari, S Belforte, G Bellettini, J Bellinger, E Ben-Haim, 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, M Campanelli, M Campbell, A Canepa, M Casarsa, D Carlsmith, S Carron, R Carosi, M Cavalli-Sforza, 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, I Cho, K Cho, D Chokheli, ML Chu, S Chuang, JY Chung, W-H Chung, YS Chung, CI Ciobanu, MA Ciocci, AG Clark, D Clark, M Coca, A Connolly, M Convery, J Conway, B Cooper, M Cordelli, G Cortiana, J Cranshaw, J Cuevas, R Culbertson, C Currat, D Cyr, D Dagenhart, S Da Ronco, S D'Auria, P de Barbaro, S De Cecco, G De Lentdecker, S Dell'Agnello, M Dell'Orso, S Demers, L Demortier, M Deninno, D De Pedis, PF Derwent, C Dionisi, JR Dittmann, P Doksus, A Dominguez, S Donati, M Donega, J Donini, M D'Onofrio, T Dorigo, V Drollinger, K Ebina, N Eddy, R Ely, R Erbacher, M Erdmann, D Errede, S Errede, R Eusebi, H-C Fang, S Farrington, I Fedorko, RG Feild, M Feindt, JP Fernandez, C Ferretti, RD Field, I Fiori, G Flanagan, B Flaugher, LR Flores-Castillo, A Foland, S Forrester, GW Foster, M Franklin, JC Freeman, H Frisch, Y Fujii, I Furic, A Gajjar, A Gallas, J Galyardt, M Gallinaro, M Garcia-Sciveres, AF Garfinkel, C Gay, H Gerberich, DW Gerdes, E Gerchtein, S Giagu, P Giannetti, A Gibson, K Gibson, C Ginsburg, K Giolo, M Giordani, G Giurgiu, V Glagolev, D Glenzinski, M Gold, N Goldschmidt, D Goldstein, J Goldstein, G Gomez, G Gomez-Ceballos, M Goncharov, O González, I Gorelov, AT Goshaw, Y Gotra, K Goulianos, A Gresele, M Griffiths, C Grosso-Pilcher, U Grundler, M Guenther, J Guimaraes da Costa, C Haber, K Hahn, SR Hahn, E Halkiadakis, A Hamilton, R Handler, F Happacher, K Hara, M Hare, RF Harr, RM Harris, F Hartmann, K Hatakeyama, J Hauser, C Hays, H Hayward, E Heider, B Heinemann, J Heinrich, M Hennecke, M Herndon, C Hill, D Hirschbuehl, A Hocker, KD Hoffman, A Holloway, S Hou, MA Houlden, BT Huffman, Y Huang, RE Hughes, J Huston, K Ikado, J Incandela, G Introzzi, M Iori, Y Ishizawa, C Issever, A Ivanov, Y Iwata, B Iyutin, E James, D Jang, J Jarrell, D Jeans, H Jensen, EJ Jeon, M Jones, KK joo, S Jun, T Junk, T Kamon, J Kang, M Karagoz Unel, PE Karchin, S Kartal, Y Kato, Y Kemp, R Kephart, U Kerzel, V Khotilovich, B Kilminster, DH Kim, HS Kim, JE Kim, MJ Kim, MS Kim, SB Kim, SH Kim, TH Kim, YK Kim, BT King, M Kirby, L Kirsch, S Klimenko, B Knuteson, BR Ko, H Kobayashi, P Koehn, DJ Kong, K Kondo, J Konigsberg, K Kordas, A Korn, A Korytov, K Kotelnikov, AV Kotwal, A Kovalev, J Kraus, I Kravchenko, A Kreymer, J Kroll, M Kruse, V Krutelyov, SE Kuhlmann, N Kuznetsova, AT Laasanen, S Lai, S Lami, S Lammel, J Lancaster, M Lancaster, R Lander, K Lannon, A Lath, G Latino, R Lauhakangas, I Lazzizzera, Y Le, C Lecci, T LeCompte, J Lee, J Lee, SW Lee, R Lefevre, N Leonardo, S Leone, JD Lewis, K Li, C Lin, CS Lin, M Lindgren, TM Liss, DO Litvintsev, T Liu, Y Liu, NS Lockyer, A Loginov, M Loreti, P Loverre, R-S Lu, D Lucchesi, P Lujan, P Lukens, G Lungu, L Lyons, J Lys, R Lysak, D MacQueen, R Madrak, K Maeshima, P Maksimovic, L Malferrari, G Manca, R Marginean, M Martin, A Martin, V Martin, M Martínez, T Maruyama, H Matsunaga, M Mattson, P Mazzanti, KS McFarland, D McGivern, PM McIntyre, P McNamara, R NcNulty, S Menzemer, A Menzione, P Merkel, C Mesropian, A Messina, T Miao, N Miladinovic, L Miller, R Miller, JS Miller, R Miquel, S Miscetti, G Mitselmakher, A Miyamoto, Y Miyazaki, N Moggi, B Mohr, R Moore, M Morello, A Mukherjee, M Mulhearn, T Muller, R Mumford, A Munar, P Murat, J Nachtman, S Nahn, I Nakamura, I Nakano, A Napier, R Napora, D Naumov, V Necula, F Niell, J Nielsen, C Nelson, T Nelson, C Neu, MS Neubauer, C Newman-Holmes, A-S Nicollerat, T Nigmanov, L Nodulman, O Norniella, K Oesterberg, T Ogawa, SH Oh, YD Oh, T Ohsugi, T Okusawa, R Oldeman, R Orava, W Orejudos, C Pagliarone, F Palmonari, R Paoletti, V Papadimitriou, S Pashapour, J Patrick, G Pauletta, M Paulini, T Pauly, C Paus, D Pellett, A Penzo, TJ Phillips, G Piacentino, J Piedra, KT Pitts, C Plager, A Pompos, L Pondrom, G Pope, O Poukhov, F Prakoshyn, T Pratt, A Pronko, J Proudfoot, F Ptohos, G Punzi, J Rademacker, A Rakitine, S Rappoccio, F Ratnikov, H Ray, A Reichold, B Reisert, V Rekovic, P Renton, M Rescigno, F Rimondi, K Rinnert, L Ristori, WJ Robertson, A Robson, T Rodrigo, S Rolli, L Rosenson, R Roser, R Rossin, C Rott, J Russ, A Ruiz, D Ryan, H Saarikko, S Sabik, A Safonov, R St Denis, WK Sakumoto, G Salamanna, D Saltzberg, C Sanchez, A Sansoni, L Santi, S Sarkar, K Sato, P Savard, A Savoy-Navarro, P Schlabach, EE Schmidt, MP Schmidt, M Schmitt, L Scodellaro, A Scribano, F Scuri, A Sedov, S Seidel, Y Seiya, F Semeria, L Sexton-Kennedy, I Sfiligoi, MD Shapiro, T Shears, PF Shepard, M Shimojima, M Shochet, Y Shon, I Shreyber, A Sidoti, J Siegrist, M Siket, A Sill, P Sinervo, A Sisakyan, A Skiba, AJ Slaughter, K Sliwa, D Smirnov, JR Smith, FD Snider, R Snihur, SV Somalwar, J Spalding, M Spezziga, L Spiegel, F Spinella, M Spiropulu, P Squillacioti, H Stadie, A Stefanini, B Stelzer, O Stelzer-Chilton, J Strologas, D Stuart, A Sukhanov, K Sumorok, H Sun, T Suzuki, A Taffard, R Tafirout, SF Takach, H Takano, R Takashima, Y Takeuchi, K Takikawa, M Tanaka, R Tanaka, N Tanimoto, S Tapprogge, M Tecchio, PK Teng, K Terashi, RJ Tesarek, S Tether, J Thom, AS Thompson, E Thomson, P Tipton, V Tiwari, S Tkaczyk, D Toback, K Tollefson, T Tomura, D Tonelli, M Tönnesmann, S Torre, D Torretta, S Tourneur, W Trischuk, J Tseng, R Tsuchiya, S Tsuno, D Tsybychev, N Turini, M Turner, F Ukegawa, T Unverhau, S Uozumi, D Usynin, L Vacavant, A Vaiciulis, A Varganov, E Vataga, S Vejcik Iii, G Velev, V Veszpremi, G Veramendi, T Vickey, R Vidal, I Vila, R Vilar, I Vollrath, I Volobouev, M von der Mey, P Wagner, RG Wagner, RL Wagner, W Wagner, R Wallny, T Walter, T Yamashita, K Yamamoto, Z Wan, MJ Wang, SM Wang, A Warburton, B Ward, S Waschke, D Waters, T Watts, M Weber, WC Wester Iii, B Whitehouse, AB Wicklund, E Wicklund, HH Williams, P Wilson, BL Winer, P Wittich, S Wolbers, M Wolter, M Worcester, S Worm, T Wright, X Wu, F Würthwein, A Wyatt, A Yagil, UK Yang, W Yao, GP Yeh, K Yi, J Yoh, P Yoon, K Yorita, T Yoshida, I Yu, S Yu, Z Yu, JC Yun, L Zanello, A Zanetti, I Zaw, F Zetti, J Zhou, A Zsenei, S Zucchelli, CDF Collaboration

Abstract:

The standard model predictions for Wgamma and Zgamma production are tested using an integrated luminosity of 200 pb(-1) of pp collision data collected at the Collider Detector at Fermilab. The cross sections are measured by selecting leptonic decays of the W and Z bosons, and photons with transverse energy ET>7 GeV that are well separated from leptons. The production cross sections and kinematic distributions for the Wgamma and Zgamma data are compared to SM predictions.
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Measurement of the Bs0 lifetime in the exclusive decay channel Bs0 → J/ψφ

Physical Review Letters 94:4 (2005)

Authors:

VM Abazov, B Abbott, M Abolins, BS Acharya, DL Adams, M Adams, T Adams, M Agelou, JL Agram, SN Ahmed, SH Ahn, GD Alexeev, G Alkhazov, A Alton, G Alverson, GA Alves, M Anastasoaie, S Anderson, B Andrieu, Y Arnoud, A Askew, B Åsman, O Atramentov, C Autermann, C Avila, L Babukhadia, TC Bacon, F Badaud, A Baden, S Baffioni, B Baldin, PW Balm, S Banerjee, E Barberis, P Bargassa, P Baringer, C Barnes, J Barreto, JF Bartlett, U Bassler, D Bauer, A Bean, S Beauceron, F Beaudette, M Begel, A Bellavance, SB Beri, G Bernardi, R Bernhard, I Bertram, M Besancon, A Besson, R Beuselinck, VA Bezzubov, PC Bhat, V Bhatnagar, M Bhattacharjee, M Binder, A Bischoff, KM Black, I Blackler, G Blazey, F Blekman, S Blessing, D Bloch, U Blumenschein, A Boehnlein, O Boeriu, TA Bolton, P Bonamy, F Borcherding, G Borissov, K Bos, T Bose, C Boswell, A Brandt, G Briskin, R Brock, G Brooijmans, A Bross, NJ Buchanan, D Buchholz, M Buehler, V Buescher, S Burdin, TH Burnett, E Busato, JM Butler, J Bystricky, F Canelli, W Carvalho, BCK Casey, D Casey, NM Cason, H Castilla-Valdez, S Chakrabarti, D Chakraborty, KM Chan, A Chandra, D Chapin

Abstract:

Using the exclusive decay Bs0 → J/ψ (μ+μ-)φ (K+K-), we report the most precise single measurement of the Bs0 lifetime. The data sample corresponds to an integrated luminosity of approximately 220 pb-1 collected with the DO detector at the Fermilab Tevatron Collider in 2002-2004. We reconstruct 337 signal candidates, from which we extract the Bs0 lifetime, τ(Bs0) = 1.444-0.090+0.098(stat) ± 0.020(sys) ps. We also report a measurement for the lifetime of the B0 meson using the exclusive decay B0 → J/ψ(μ+μ-) K*0(&92)(K+π-). We reconstruct 1370 signal candidates, obtaining τ(B0) = 1.473 -0.050+0.052(stat)±0.023(sys) ps, and the ratio of lifetimes, τ(Bs0)/τ(B0) = 0.980 -0.0.710.076(stat) ± 0.003(sys). © 2005 The American Physical Society.
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Search for supersymmetry with gauge-mediated breaking in diphoton events at D0

Physical Review Letters 94:4 (2005)

Authors:

VM Abazov, B Abbott, M Abolins, BS Acharya, DL Adams, M Adams, T Adams, M Agelou, JL Agram, SN Ahmed, SH Ahn, GD Alexeev, G Alkhazov, A Alton, G Alverson, GA Alves, S Anderson, B Andrieu, Y Arnoud, A Askew, B Åsman, O Atramentov, C Autermann, C Avila, L Babukhadia, TC Bacon, A Baden, S Baffioni, B Baldin, PW Balm, S Banerjee, E Barberis, P Bargassa, P Baringer, C Barnes, J Barreto, JF Bartlett, U Bassler, D Bauer, A Bean, S Beauceron, F Beaudette, M Begel, A Bellavance, SB Beri, G Bernardi, R Bernhard, I Bertram, M Besançon, A Besson, R Beuselinck, VA Bezzubov, PC Bhat, V Bhatnagar, M Bhattacharjee, M Binder, A Bischoff, KM Black, I Blackler, G Blazey, F Blekman, D Bloch, U Blumenschein, A Boehnlein, O Boeriu, TA Bolton, P Bonamy, F Borcherding, G Borissov, K Bos, T Bose, C Boswell, A Brandt, G Briskin, R Brock, G Brooijmans, A Bross, NJ Buchanan, D Buchholz, M Buehler, V Buescher, S Burdin, TH Burnett, E Busato, JM Butler, J Bystricky, F Canelli, W Carvalho, BCK Casey, D Casey, NM Cason, H Castilla-Valdez, S Chakrabarti, D Chakraborty, KM Chan, A Chandra, D Chapin, F Charles, E Cheu, L Chevalier

Abstract:

We report the results of a search for supersymmetry (SUSY) with gauge-mediated breaking in the missing transverse energy distribution of inclusive diphoton events using 263 pb-1 of data collected by the DO experiment at the Fermilab Tevatron Collider in 2002-2004. No excess is observed above the background expected from standard model processes, and lower limits on the masses of the lightest neutralino and chargino of about 108 and 195 GeV, respectively, are set at the 95% confidence level. These are the most stringent limits to date for models with gauge-mediated SUSY breaking with a short-lived neutralino as the next-to-lightest SUSY particle. © 2005 The American Physical.
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Comparison of three-jet events in pp̄ collisions at √s = 1.8 TeV to predictions from a next-to-leading order QCD calculation

Physical Review D - Particles, Fields, Gravitation and Cosmology 71:3 (2005) 032002-1-032002-12

Authors:

DE Acosta, T Affolder, MG Albrow, DJ Ambrose, D Amidei, K Anikeev, J Antoš, G Apollinari, T Arisawa, AM Artikov, WJ Ashmanskas, F Azfar, P Azzi-Bacchetta, N Bacchetta, H Bachacou, WF Badgett, AA Barbaro-Galtieri, VE Barnes, BA Barnett, S Baroiant, M Barone, G Bauer, F Bedeschi, S Behari, S Belforte, WH Bell, G Bellettini, JN Bellinger, DP Benjamin, A Beretvas, AA Bhatti, ME Binkley, DB Bisello, MR Bishai, RE Blair, CA Blocker, K Bloom, BJ Blumenfeld, A Bocci, A Bodek, G Bolla, AA Bolshov, D Bortoletto, JF Boudreau, CM Bromberg, EM Brubaker, JA Budagov, HS Budd, K Burkett, G Busetto, KL Byrum, S Cabrera, MK Campbell, WC Carithers, D Carlsmith, AJ Castro, D Cauz, A Cerri, L Cerrito, JW Chapman, C Chen, Y Chen, MB Chertok, G Chiarelli, GA Chlachidze, FS Chlebana, M Chu, J Chung, WH Chung, Y Chung, CI Ciobanu, AG Clark, MN Coca, A Connolly, ME Convery, JS Conway, M Cordelli, J Cranshaw, RL Culbertson, DW Dagenhart, S D'Auria, P De Barbaro, SD De Cecco, S Dell'Agnello, M Dell'Orso, SM Demers, L Demortier, MM Deninno, D De Pedis, PF Derwent, C Dionisi, JR Dittmann, A Domínguez, S Donati, M D'Onofrio, T Dorigo, N Eddy, RD Erbacher, D Errede, SM Errede, R Eusebi, SM Farrington, RG Feild, JP Fernández, C Ferretti, RD Field, I Fiori, BL Flaugher, LR Flores-Castillo, GW Foster, MEB Franklin, JI Friedman, IK Furić, M Gallinaro, AF Garfinkel, C Gay, DW Gerdes, E Gerstein, S Giagu, P Giannetti, K Giolo, MP Giordani, P Giromini, VV Glagolev, DA Glenzinskí, MS Gold, N Goldschmidt, J Goldstein, G Gómez, MV Goncharov, IV Gorelov, AT Goshaw, YN Gotra, K Goulianos, A Gresele, C Grosso-Pilcher, M Guenther, JB Guimarães Da Costa, CH Haber, SR Hahn, E Halkiadakis, R Handler, F Happacher, K Hara, RM Harris, FX Hartmann, K Hatakeyama, J Hauser, JG Heinrich, M Hennecke, M Herndon, CS Hill, A Höcker, KD Hoffman, S Hou, BT Huffman, RE Hughes, JW Huston, JR Incandela, G Introzzi, M Iori, C Ìşsever, A Ivanov, Y Iwata, B Iyutin, EB James, MK Jones, T Kamon, J Kang, MK Ünel, SN Kartal, H Kasha, Y Kato, RD Kennedy, RD Kephart, BJ Kilminster, DH Kim, H Kim, M Kim, SB Kim, S Kim, T Kim, Y Kim, MH Kirby, LE Kirsch, S Klimenko, P Koehn, K Kondo, J Königsberg, A Korn, AV Korytov, J Kroll, MC Kruse, V Krutelyov, SE Kuhlmann, N Kuznetsova, AT Laasanen, SS Lami, S Lammel, JM Lancaster, MA Lancaster, RL Lander, K Lannon, A Lath, G Latino, TJ LeCompte, Y Le, J Lee, S Lee, NT Leonardo, S Leone, JD Lewis, K Li, CSS Lin, MA Lindgren, TM Liss, DO Litvintsev, T Liu, NS Lockyer, AY Loginov, M Loreti, D Lucchesi, PT Lukens, LPR Lyons, JEA Lys, RL Madrak, K Maeshima, P Maksimović, L Malferrari, G Manca, ML Mangano, M Maríotti, AJ Martin, MS Martin, VJ Martin, MI Martínez, P Mazzanti, KS McFarland, PM McIntyre, M Menguzzato, A Menzione, P Merkel, C Mesropian, AB Meyer, T Miao, JS Miller, RJD Miller, S Miscetti, GV Mitselmakher, N Moggi, RW Moore, TK Moulik, A Mukherjee, M Mulhearn, TA Müller, A Munar, PA Murat, JM Nachtman, S Nahn, I Nakano, R Napora, CA Nelson, TK Nelson, C Neu, MS Neubauer, CB Newman-Holmes, F Niell, TS Nigmanov, LJ Nodulman, SH Oh, Y Oh, T Ohsugi, T Okusawa, W Orejudos, CE Pagliarone, FM Palmonari, R Paoletti, VK Papadimitriou, JF Patrick, G Pauletta, MG Paulini, T Pauly, C Paus, DE Pellett, A Penzo, TJ Phillips, GM Piacentino, J Piedra, KT Pitts, A Pompoš, LG Pondrom, G Pope, O Poukhov, T Pratt, FV Prokoshin, J Proudfoot, F Ptohos, G Punzi, JH Rademacker, A Rakitine, FD Ratnikov, H Ray, AJH Reichold, PB Renton, M Rescigno, F Rimondi, L Ristori, WJ Robertson, T Rodrigo, S Rolli, L Rosenson, RM Roser, R Rossin, C Rott, AS Roy, A Ruiz-Jimeno, DT Ryan, AN Safonov, RDS St Denis, WK Sakumoto, DP Saltzberg, CAS Sánchez, A Sansoni, L Santi, S Sarkar, P Savard, A Savoy-Navarro, P Schlabach, EE Schmidt, MP Schmidt, M Schmitt, L Scodellaro, A Scribano, A Sedov, SC Seidel, Y Seiya, AA Semenov, F Semeria, MD Shapiro, PF Shepard, T Shibayama, M Shimojima, MJ Shochet, A Sidoti, AF Sill, PK Sinervo, AJ Slaughter, K Śliwa, FD Snider, R Snihur, MA Spezziga, L Spiegel, F Spinella, M Spiropulu, AAM Stefanini, J Strologas, DD Stuart, AI Sukhanov, KCTO Sumorok, T Suzuki, R Takashima, K Takikawa, M Tanaka, M Tecchio, P Teng, K Terashi, RJ Tesarek, S Tether, JJ Thorn, TLT Thomas, AS Thompson, EJ Thomson, PL Tipton, SM Tkaczyk, D Toback, K Tollefson, D Tonelli, M Tönnesmann, H Toyoda, W Trischuk, J Tseng, D Tsybychev, N Turini, F Ukegawa, T Unverhau, T Vaiciulis, AV Varganov, ES Vataga, S Vejcik, GV Velev, G Veramendi, RA Vidal, I Vila, R Vilar, I Volobouev, M Von Der Mey, RG Wagner, RL Wagner, W Wagner, Z Wan, C Wang, M Wang, S Wang, BR Ward, S Waschke, DS Waters, TL Watts, MS Weber, WC Wester, B Whitehouse, AB Wicklund, EJ Wicklund, HH Williams, PJ Wilson, BL Winer, SA Wolbers, MW Wolter, SD Worm, X Wu, F Würthwein, U Yang, W Yao, GP Yeh, K Yi, J Yoh, T Yoshida, I Yu, S Yu, JC Yun, L Zanello, AM Zanetti, F Zetti, S Zucchelli

Abstract:

The properties of three-jet events with total transverse energy greater than 320 GeV and individual jet energy greater than 20 GeV have been analyzed and compared to absolute predictions from a next-to-leading order (NLO) perturbative QCD calculation. These data, of integrated luminosity 86 pb -1, were recorded by the CDF Experiment for pp collisions at √s = 1.8 TeV This study tests a model of higher order QCD processes that result in gluon emission and may give some indication of the magnitude of the contribution of processes higher than NLO. The total cross section is measured to be 466 ± 3(stat.)-70 +207(syst.) pb. The differential cross section is furthermore measured for all kinematically accessible regions of the Dalitz plane, including those for which the theoretical prediction is unreliable. While the measured cross section is consistent with the theoretical prediction in magnitude, the two differ somewhat in shape in the Dalitz plane. © 2005 The American Physical Society.
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