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Insertion of STC into TRT at the Department of Physics, Oxford
Credit: CERN

Professor Chris Hays

Professor of Physics

Research theme

  • Fundamental particles and interactions

Sub department

  • Particle Physics

Research groups

  • ATLAS
Chris.Hays@physics.ox.ac.uk
Telephone: 01865 (2)73355
Denys Wilkinson Building, room 675
  • About
  • Research
  • Publications

W boson mass and Properties

AIP Conference Proceedings 792 (2005) 559-562

Abstract:

Measurements of the W boson determine fundamental parameters of the standard model and test its internal consistency at the level of radiative corrections. In particular, the W boson mass constrains the mass of the unobserved Higgs boson through loop corrections, and the W boson width indirectly determines elements of the CKM matrix defining quark generational mixing in the electroweak interactions. The CDF Collaboration has analyzed ≈200 pb -1 of s=1.96TeV pp̄ collision data and determined the uncertainty on its W boson mass measurement to be 76 MeV. The DØ Collaboration has directly measured the W boson width to be Γ W = 2.011 ± 0.09(stat.)±0.107(syst.) GeV using 177 pb -1 of W → ev data. © 2005 American Institute of Physics.
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Search for new physics using high-mass tau pairs from 1.96 TeV pp collisions.

Phys Rev Lett 95:13 (2005) 131801

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, G Bauer, F Bedeschi, S Behari, S Belforte, G Bellettini, J Bellinger, A Belloni, E Ben-Haim, D Benjamin, A Beretvas, T Berry, 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, S Bourov, B Brau, C Bromberg, E Brubaker, J Budagov, HS Budd, K Burkett, G Busetto, P Bussey, KL Byrum, S Cabrera, M Campanelli, M Campbell, F Canelli, A Canepa, M Casarsa, D Carlsmith, R Carosi, S Carron, M Cavalli-Sforza, A Castro, P Catastini, D Cauz, A Cerri, L Cerrito, J Chapman, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, I Cho, K Cho, D Chokheli, JP Chou, S Chuang, K Chung, W-H Chung, YS Chung, M Cijliak, CI Ciobanu, MA Ciocci, AG Clark, D Clark, M Coca, A Connolly, M Convery, J Conway, B Cooper, K Copic, M Cordelli, G Cortiana, J Cranshaw, J Cuevas, A Cruz, R Culbertson, C Currat, D Cyr, D Dagenhart, S Da Ronco, S D'Auria, P de Barbaro, S De Cecco, A Deisher, G De Lentdecker, M Dell'orso, S Demers, L Demortier, M Deninno, D De Pedis, PF Derwent, T Devlin, C Dionisi, JR Dittmann, P Dituro, C Dörr, A Dominguez, S Donati, M Donega, J Donini, M D'Onofrio, T Dorigo, K Ebina, J Efron, J Ehlers, R Erbacher, M Erdmann, D Errede, S Errede, R Eusebi, H-C Fang, S Farrington, I Fedorko, WT Fedorko, RG Feild, M Feindt, JP Fernandez, RD Field, G Flanagan, LR Flores-Castillo, A Foland, S Forrester, GW Foster, M Franklin, JC Freeman, Y Fujii, I Furic, A Gajjar, M Gallinaro, J Galyardt, 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, M Giunta, 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, J Guimaraes da Costa, C Haber, K Hahn, SR Hahn, E Halkiadakis, A Hamilton, B-Y Han, R Handler, F Happacher, K Hara, M Hare, RF Harr, RM Harris, F Hartmann, K Hatakeyama, J Hauser, C Hays, H Hayward, 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, B Jayatilaka, D Jeans, H Jensen, EJ Jeon, M Jones, KK Joo, SY Jun, T Junk, T Kamon, J Kang, M Karagoz Unel, PE Karchin, 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, YK Kim, M Kirby, L Kirsch, S Klimenko, M Klute, B Knuteson, BR Ko, H Kobayashi, DJ Kong, K Kondo, J Konigsberg, K Kordas, A Korn, A Korytov, AV Kotwal, A Kovalev, J Kraus, I Kravchenko, A Kreymer, J Kroll, M Kruse, V Krutelyov, SE Kuhlmann, S Kwang, AT Laasanen, S Lai, S Lami, S Lammel, M Lancaster, R Lander, K Lannon, A Lath, G Latino, I Lazzizzera, C Lecci, T Lecompte, J Lee, J Lee, SW Lee, R Lefèvre, N Leonardo, S Leone, S Levy, JD Lewis, K Li, C Lin, CS Lin, M Lindgren, E Lipeles, TM Liss, A Lister, 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, E Lytken, D Macqueen, R Madrak, K Maeshima, P Maksimovic, G Manca, F Margaroli, R Marginean, C Marino, A Martin, M Martin, V Martin, M Martínez, T Maruyama, H Matsunaga, M Mattson, P Mazzanti, KS McFarland, D McGivern, PM McIntyre, P McNamara, R McNulty, A Mehta, S Menzemer, A Menzione, P Merkel, C Mesropian, A Messina, T Miao, N Miladinovic, J Miles, L Miller, R Miller, JS Miller, C Mills, R Miquel, S Miscetti, G Mitselmakher, A Miyamoto, N Moggi, B Mohr, R Moore, M Morello, PA Movilla Fernandez, J Muelmenstaedt, A Mukherjee, M Mulhearn, T Muller, R Mumford, A Munar, P Murat, J Nachtman, S Nahn, I Nakano, A Napier, R Napora, D Naumov, V Necula, J Nielsen, T Nelson, C Neu, MS Neubauer, T Nigmanov, L Nodulman, O Norniella, T Ogawa, SH Oh, YD Oh, T Ohsugi, T Okusawa, R Oldeman, R Orava, W Orejudos, K Osterberg, C Pagliarone, E Palencia, R Paoletti, V Papadimitriou, AA Paramonov, S Pashapour, J Patrick, G Pauletta, M Paulini, C Paus, D Pellett, A Penzo, TJ Phillips, G Piacentino, J Piedra, KT Pitts, C Plager, L Pondrom, G Pope, X Portell, O Poukhov, N Pounder, F Prakoshyn, A Pronko, J Proudfoot, F Ptohos, G Punzi, J Rademacker, MA Rahaman, A Rakitine, S Rappoccio, F Ratnikov, H Ray, B Reisert, V Rekovic, P Renton, M Rescigno, F Rimondi, K Rinnert, L Ristori, WJ Robertson, A Robson, T Rodrigo, S Rolli, R Roser, R Rossin, C Rott, J Russ, V Rusu, A Ruiz, D Ryan, H Saarikko, S Sabik, A Safonov, R St Denis, WK Sakumoto, G Salamanna, D Saltzberg, C Sanchez, L Santi, S Sarkar, K Sato, P Savard, A Savoy-Navarro, P Schlabach, EE Schmidt, MP Schmidt, M Schmitt, T Schwarz, L Scodellaro, AL Scott, A Scribano, F Scuri, A Sedov, S Seidel, Y Seiya, A Semenov, F Semeria, L Sexton-Kennedy, I Sfiligoi, MD Shapiro, T Shears, PF Shepard, D Sherman, M Shimojima, M Shochet, Y Shon, I Shreyber, A Sidoti, A Sill, P Sinervo, A Sisakyan, J Sjolin, A Skiba, AJ Slaughter, K Sliwa, D Smirnov, JR Smith, FD Snider, R Snihur, M Soderberg, A Soha, SV Somalwar, J Spalding, M Spezziga, F Spinella, P Squillacioti, H Stadie, M Stanitzki, B Stelzer, O Stelzer-Chilton, D Stentz, J Strologas, D Stuart, JS Suh, A Sukhanov, K Sumorok, H Sun, T Suzuki, A Taffard, R Tafirout, H Takano, R Takashima, Y Takeuchi, K Takikawa, M Tanaka, R Tanaka, N Tanimoto, 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, R Tsuchiya, S Tsuno, D Tsybychev, N Turini, F Ukegawa, T Unverhau, S Uozumi, D Usynin, L Vacavant, A Vaiciulis, A Varganov, S Vejcik, 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, Z Wan, MJ Wang, SM Wang, A Warburton, B Ward, S Waschke, D Waters, T Watts, M Weber, WC Wester, B Whitehouse, D Whiteson, AB Wicklund, E Wicklund, HH Williams, P Wilson, BL Winer, P Wittich, S Wolbers, C Wolfe, M Wolter, M Worcester, S Worm, T Wright, X Wu, F Würthwein, A Wyatt, A Yagil, T Yamashita, K Yamamoto, J Yamaoka, C Yang, UK Yang, W Yao, GP Yeh, J Yoh, K Yorita, T Yoshida, I Yu, S Yu, JC Yun, L Zanello, A Zanetti, I Zaw, F Zetti, J Zhou, S Zucchelli, CDF Collaboration

Abstract:

We present the results of a search for anomalous resonant production of tau lepton pairs with large invariant mass, the first such search using the CDF II Detector in Run II of the Tevatron pp collider. Such anomalous production could arise from various new physics processes. In a data sample corresponding to 195 pb(-1) of integrated luminosity we predict 2.8+/-0.5 events from standard model background processes and observe 4. We use this result to set limits on the production of heavy scalar and vector particles decaying to tau lepton pairs.
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Measurement of B(t --> Wb)/B(t--> Wq) at the collider detector at fermilab.

Phys Rev Lett 95:10 (2005) 102002

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, G Bauer, F Bedeschi, S Behari, S Belforte, G Bellettini, J Bellinger, A Belloni, E Ben-Haim, D Benjamin, A Beretvas, T Berry, 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, S Bourov, B Brau, C Bromberg, E Brubaker, J Budagov, HS Budd, K Burkett, G Busetto, P Bussey, KL Byrum, S Cabrera, M Campanelli, M Campbell, F Canelli, A Canepa, M Casarsa, D Carlsmith, R Carosi, S Carron, M Cavalli-Sforza, A Castro, P Catastini, D Cauz, A Cerri, L Cerrito, J Chapman, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, I Cho, K Cho, D Chokheli, JP Chou, S Chuang, K Chung, W-H Chung, YS Chung, M Cijliak, CI Ciobanu, MA Ciocci, AG Clark, D Clark, M Coca, A Connolly, M Convery, J Conway, B Cooper, K Copic, M Cordelli, G Cortiana, J Cranshaw, J Cuevas, A Cruz, R Culbertson, C Currat, D Cyr, D Dagenhart, S Da Ronco, S D'Auria, P de Barbaro, S De Cecco, A Deisher, G De Lentdecker, M Dell'Orso, S Demers, L Demortier, M Deninno, D de Pedis, PF Derwent, C Dionisi, JR Dittmann, P DiTuro, C Dörr, A Dominguez, S Donati, M Donega, J Donini, M D'Onofrio, T Dorigo, K Ebina, J Efron, J Ehlers, R Erbacher, M Erdmann, D Errede, S Errede, R Eusebi, H-C Fang, S Farrington, I Fedorko, WT Fedorko, RG Feild, M Feindt, JP Fernandez, RD Field, G Flanagan, LR Flores-Castillo, A Foland, S Forrester, GW Foster, M Franklin, JC Freeman, Y Fujii, I Furic, A Gajjar, M Gallinaro, J Galyardt, 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, M Giunta, 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, J Guimaraes da Costa, C Haber, K Hahn, SR Hahn, E Halkiadakis, A Hamilton, B-Y Han, R Handler, F Happacher, K Hara, M Hare, RF Harr, RM Harris, F Hartmann, K Hatakeyama, J Hauser, C Hays, H Hayward, 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, B Jayatilaka, D Jeans, H Jensen, EJ Jeon, M Jones, KK Joo, SY Jun, T Junk, T Kamon, J Kang, M Karagoz Unel, PE Karchin, 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, YK Kim, M Kirby, L Kirsch, S Klimenko, M Klute, B Knuteson, BR Ko, H Kobayashi, DJ Kong, K Kondo, J Konigsberg, K Kordas, A Korn, A Korytov, AV Kotwal, A Kovalev, J Kraus, I Kravchenko, A Kreymer, J Kroll, M Kruse, V Krutelyov, SE Kuhlmann, S Kwang, AT Laasanen, S Lai, S Lami, S Lammel, M Lancaster, R Lander, K Lannon, A Lath, G Latino, I Lazzizzera, C Lecci, T Lecompte, J Lee, J Lee, SW Lee, R Lefèvre, N Leonardo, S Leone, S Levy, JD Lewis, K Li, C Lin, CS Lin, M Lindgren, E Lipeles, TM Liss, A Lister, 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, E Lytken, D MacQueen, R Madrak, K Maeshima, P Maksimovic, G Manca, F Margaroli, R Marginean, C Marino, A Martin, M Martin, V Martin, M Martínez, T Maruyama, H Matsunaga, M Mattson, P Mazzanti, KS McFarland, D McGivern, PM McIntyre, P McNamara, R McNulty, A Mehta, S Menzemer, A Menzione, P Merkel, C Mesropian, A Messina, T Miao, N Miladinovic, J Miles, L Miller, R Miller, JS Miller, C Mills, R Miquel, S Miscetti, G Mitselmakher, A Miyamoto, N Moggi, B Mohr, R Moore, M Morello, PA Movilla Fernandez, J Muelmenstaedt, A Mukherjee, M Mulhearn, T Muller, R Mumford, A Munar, P Murat, J Nachtman, S Nahn, I Nakano, A Napier, R Napora, D Naumov, V Necula, T Nelson, C Neu, MS Neubauer, J Nielsen, T Nigmanov, L Nodulman, O Norniella, T Ogawa, SH Oh, YD Oh, T Ohsugi, T Okusawa, R Oldeman, R Orava, W Orejudos, K Osterberg, C Pagliarone, E Palencia, R Paoletti, V Papadimitriou, AA Paramonov, S Pashapour, J Patrick, G Pauletta, M Paulini, C Paus, D Pellett, A Penzo, TJ Phillips, G Piacentino, J Piedra, KT Pitts, C Plager, L Pondrom, G Pope, X Portell, O Poukhov, N Pounder, F Prakoshyn, A Pronko, J Proudfoot, F Ptohos, G Punzi, J Rademacker, MA Rahaman, A Rakitine, S Rappoccio, F Ratnikov, H Ray, B Reisert, V Rekovic, P Renton, M Rescigno, F Rimondi, K Rinnert, L Ristori, WJ Robertson, A Robson, T Rodrigo, S Rolli, R Roser, R Rossin, C Rott, J Russ, V Rusu, A Ruiz, D Ryan, H Saarikko, S Sabik, A Safonov, R St Denis, WK Sakumoto, G Salamanna, D Saltzberg, C Sanchez, L Santi, S Sarkar, K Sato, P Savard, A Savoy-Navarro, P Schlabach, EE Schmidt, MP Schmidt, M Schmitt, T Schwarz, L Scodellaro, AL Scott, A Scribano, F Scuri, A Sedov, S Seidel, Y Seiya, A Semenov, F Semeria, L Sexton-Kennedy, I Sfiligoi, MD Shapiro, T Shears, PF Shepard, D Sherman, M Shimojima, M Shochet, Y Shon, I Shreyber, A Sidoti, A Sill, P Sinervo, A Sisakyan, J Sjolin, A Skiba, AJ Slaughter, K Sliwa, D Smirnov, JR Smith, FD Snider, R Snihur, M Soderberg, A Soha, SV Somalwar, J Spalding, M Spezziga, F Spinella, P Squillacioti, H Stadie, M Stanitzki, B Stelzer, O Stelzer-Chilton, D Stentz, J Strologas, D Stuart, JS Suh, A Sukhanov, K Sumorok, H Sun, T Suzuki, A Taffard, R Tafirout, H Takano, R Takashima, Y Takeuchi, K Takikawa, M Tanaka, R Tanaka, N Tanimoto, 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, R Tsuchiya, S Tsuno, D Tsybychev, N Turini, F Ukegawa, T Unverhau, S Uozumi, D Usynin, L Vacavant, A Vaiciulis, A Varganov, S Vejcik, 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, Z Wan, MJ Wang, SM Wang, A Warburton, B Ward, S Waschke, D Waters, T Watts, M Weber, WC Wester, B Whitehouse, D Whiteson, AB Wicklund, E Wicklund, HH Williams, P Wilson, BL Winer, P Wittich, S Wolbers, C Wolfe, M Wolter, M Worcester, S Worm, T Wright, X Wu, F Würthwein, A Wyatt, A Yagil, T Yamashita, K Yamamoto, J Yamaoka, C Yang, UK Yang, W Yao, GP Yeh, J Yoh, K Yorita, T Yoshida, I Yu, S Yu, JC Yun, L Zanello, A Zanetti, I Zaw, F Zetti, J Zhou, S Zucchelli, CDF Collaboration

Abstract:

We present a measurement of the ratio of top-quark branching fractions R = B(t --> Wb)/B(t --> Wq), where q can be a b, s, or a d quark, using lepton-plus-jets and dilepton data sets with an integrated luminosity of approximately 162 pb(-1) collected with the Collider Detector at Fermilab during Run II of the Tevatron. The measurement is derived from the relative numbers of tt events with different multiplicity of identified secondary vertices. We set a lower limit of R > 0.61 at 95% confidence level.
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Measurement of the cross section for tt̄ production in pp̄ collisions using the kinematics of lepton+jets events

Physical Review D Particles Fields Gravitation and Cosmology 72:5 (2005)

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, JF 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, G Bauer, F Bedeschi, S Behari, S Belforte, G Bellettini, J Bellinger, A Belloni, E Ben-Haim, D Benjamin, A Beretvas, T Berry, 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, S Bourov, B Brau, C Bromberg, E Brubaker, J Budagov, HS Budd, K Burkett, G Busetto, P Bussey, KL Byrum, S Cabrera, M Campanelli, M Campbell, F Canelli, A Canepa, M Casarsa, D Carlsmith, R Carosi, S Carron, M Cavalli-Sforza, A Castro, P Catastini, D Cauz, A Cerri, L Cerrito, J Chapman, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, I Cho, K Cho, D Chokheli, JP Chou, S Chuang, K Chung, WH Chung, YS Chung, M Cijliak, CI Ciobanu, MA Ciocci, AG Clark, D Clark, M Coca, A Connolly

Abstract:

We present a measurement of the top pair production cross section in pp̄ collisions at s=1.96TeV. We collect a data sample with an integrated luminosity of 194±11pb-1 with the CDF II detector at the Fermilab Tevatron. We use an artificial neural network technique to discriminate between top pair production and background processes in a sample of 519 lepton+jets events, which have one isolated energetic charged lepton, large missing transverse energy and at least three energetic jets. We measure the top pair production cross section to be σtt̄=6.6±1.1±1.5pb, where the first uncertainty is statistical and the second is systematic. © 2005 The American Physical Society.
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Search for first-generation scalar leptoquarks in pp̄ collisions at s=1.96 TeV

Physical Review D - Particles, Fields, Gravitation and Cosmology 72:5 (2005)

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, JF 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, G Bauer, F Bedeschi, S Behari, S Belforte, G Bellettini, J Bellinger, A Belloni, E Ben-Haim, D Benjamin, A Beretvas, T Berry, 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, S Bourov, B Brau, C Bromberg, E Brubaker, J Budagov, HS Budd, K Burkett, G Busetto, P Bussey, KL Byrum, S Cabrera, M Campanelli, M Campbell, F Canelli, A Canepa, M Casarsa, D Carlsmith, R Carosi, S Carron, M Cavalli-Sforza, A Castro, P Catastini, D Cauz, A Cerri, L Cerrito, J Chapman, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, I Cho, K Cho, D Chokheli, JP Chou, S Chuang, K Chung, WH Chung, YS Chung, M Cijliak, CI Ciobanu, MA Ciocci, AG Clark, D Clark, M Coca, A Connolly

Abstract:

We report on a search for pair production of first-generation scalar leptoquarks (LQ) in pp̄ collisions at s=1.96 TeV using an integrated luminosity of 203 pb-1 collected at the Fermilab Tevatron collider by the CDF experiment. We observe no evidence for LQ production in the topologies arising from LQLQ̄→eqeq and LQLQ̄→eqνq, and derive 95% C.L. upper limits on the LQ production cross section. The results are combined with those obtained from a separately reported CDF search in the topology arising from LQLQ̄→νqνq and 95% C.L. lower limits on the LQ mass as a function of β=BR(LQ→eq) are derived. The limits are 236, 205 and 145GeV/c2 for β=1, β=0.5 and β=0.1, respectively. © 2005 The American Physical Society.
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