Professor Chris Hays: Publications

Evidence for tt̄γ production and measurement of σtt̄γ/σtt̄

Physical Review D - Particles, Fields, Gravitation and Cosmology 84:3 (2011)

Authors:

T Aaltonen, B Álvarez González, S Amerio, D Amidei, A Anastassov, A Annovi, J Antos, G Apollinari, JA Appel, A Apresyan, T Arisawa, A Artikov, J Asaadi, W Ashmanskas, B Auerbach, A Aurisano, F Azfar, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, P Barria, P Bartos, M Bauce, G Bauer, F Bedeschi, D Beecher, S Behari, G Bellettini, J Bellinger, D Benjamin, A Beretvas, A Bhatti, M Binkley, D Bisello, I Bizjak, KR Bland, B Blumenfeld, A Bocci, A Bodek, D Bortoletto, J Boudreau, A Boveia, B Brau, L Brigliadori, A Brisuda, C Bromberg, E Brucken, M Bucciantonio, J Budagov, HS Budd, S Budd, K Burkett, G Busetto, P Bussey, A Buzatu, C Calancha, S Camarda, M Campanelli, M Campbell, F Canelli, A Canepa, B Carls, D Carlsmith, R Carosi, S Carrillo, S Carron, B Casal, M Casarsa, A Castro, P Catastini, D Cauz, V Cavaliere, M Cavalli-Sforza, A Cerri, L Cerrito, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, K Cho, D Chokheli, JP Chou, WH Chung, YS Chung, CI Ciobanu, MA Ciocci, A Clark, G Compostella, ME Convery, J Conway, M Corbo, M Cordelli, CA Cox, DJ Cox, F Crescioli, C Cuenca Almenar, J Cuevas, R Culbertson

Abstract:

Using data corresponding to 6.0fb-1 of pp̄ collisions at √s=1.96TeV collected by the CDF II detector, we present a cross section measurement of top-quark pair production with an additional radiated photon in the central region with 10 GeV or more of transverse energy tt̄γ. The events are selected by looking for a lepton (ℓ or μ), a photon (γ), significant transverse momentum imbalance (ET), large total transverse energy, and three or more jets, with at least one identified as containing a b quark (b). Using an event selection optimized for the tt̄γ candidate sample, we also measure the cross section of tt̄ (σtt̄). We measure the tt̄γ cross section (σtt̄γ) to be 0.18±0.08pb, and the ratio of σtt̄γ to σtt̄ to be 0.024±0.009. We observe a probability of 0.0015 (3.0 standard deviations) of the background (non-tt̄γ events alone producing 30 events or more. © 2011 American Physical Society.

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Observation of the Ξb0 baryon

Physical Review Letters 107:10 (2011)

Authors:

T Aaltonen, B Álvarez González, S Amerio, D Amidei, A Anastassov, A Annovi, J Antos, G Apollinari, JA Appel, A Apresyan, T Arisawa, A Artikov, J Asaadi, W Ashmanskas, B Auerbach, A Aurisano, F Azfar, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, P Barria, P Bartos, M Bauce, G Bauer, F Bedeschi, D Beecher, S Behari, G Bellettini, J Bellinger, D Benjamin, A Beretvas, A Bhatti, M Binkley, D Bisello, I Bizjak, KR Bland, B Blumenfeld, A Bocci, A Bodek, D Bortoletto, J Boudreau, A Boveia, L Brigliadori, A Brisuda, C Bromberg, E Brucken, M Bucciantonio, J Budagov, HS Budd, S Budd, K Burkett, G Busetto, P Bussey, A Buzatu, C Calancha, S Camarda, M Campanelli, M Campbell, F Canelli, B Carls, D Carlsmith, R Carosi, S Carrillo, S Carron, B Casal, M Casarsa, A Castro, P Catastini, D Cauz, V Cavaliere, M Cavalli-Sforza, A Cerri, L Cerrito, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, K Cho, D Chokheli, JP Chou, WH Chung, YS Chung, CI Ciobanu, MA Ciocci, A Clark, C Clarke, G Compostella, ME Convery, J Conway, M Corbo, M Cordelli, CA Cox, DJ Cox, F Crescioli, C Cuenca Almenar, J Cuevas, R Culbertson, D Dagenhart

Abstract:

The observation of the bottom, strange baryon Ξb0 through the decay chain Ξb0→Ξc+π-, where Ξc+→Ξ -π+π+, Ξ -→Λπ-, and Λ→pπ-, is reported by using data corresponding to an integrated luminosity of 4.2fb-1 from pp̄ collisions at √s=1.96TeV recorded with the Collider Detector at Fermilab. A signal of 25.3-5.4+5.6 candidates is observed whose probability of arising from a background fluctuation is 3.6×10-12, corresponding to 6.8 Gaussian standard deviations. The Ξb0 mass is measured to be 5787.8±5.0(stat)±1.3(syst)MeV/ c2. In addition, the Ξb- baryon is observed through the process Ξb-→Ξc0π-, where Ξc0→Ξ -π+, Ξ-→Λπ-, and Λ→pπ-. © 2011 American Physical Society.

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Measurement of the tt̄ production cross section in pp̄ collisions at √s=1.96TeV using events with large missing transverse energy and jets

Physical Review D - Particles, Fields, Gravitation and Cosmology 84:3 (2011)

Authors:

Abstract:

In this paper we report a measurement of the tt̄ production cross section in pp̄ collisions at √s=1.96TeV using data corresponding to an integrated luminosity of 2.2fb-1 collected with the CDF II detector at the Tevatron accelerator. We select events with significant missing transverse energy and high jet multiplicity. This measurement vetoes the presence of explicitly identified electrons and muons, thus enhancing the tau contribution of tt̄ decays. Signal events are discriminated from the background using a neural network, and heavy flavor jets are identified by a secondary-vertex tagging algorithm. We measure a tt̄ production cross section of 7.99±0.55(stat)±0.76(syst)±0.46(lumi) pb, assuming a top mass mtop=172.5GeV/c2, in agreement with previous measurements and standard model predictions. © 2011 American Physical Society.

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Search for WZ+ZZ production with MET + jets with b enhancement at sqrt(s) = 1.96 TeV

(2011)

Authors:

CDF Collaboration, T Aaltonen, B Álvarez Gonzálezv, S Amerio, D Amidei, A Anastassov, A Annovi, J Antos, G Apollinari, JA Appel, A Apresyan, T Arisawa, A Artikov, J Asaadi, W Ashmanskas, B Auerbach, A Aurisano, F Azfar, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, P Barriaee, P Bartos, M Baucecc, G Bauer, F Bedeschi, D Beecher, S Behari, G Bellettinidd, J Bellinger, D Benjamin, A Beretvas, A Bhatti, M Binkley, D Bisellocc, I Bizjakii, KR Bland, C Blocker, B Blumenfeld, A Bocci, A Bodek, D Bortoletto, J Boudreau, A Boveia, B Braua, L Brigliadoribb, A Brisuda, C Bromberg, E Brucken, M Bucciantoniodd, J Budagov, HS Budd, S Budd, K Burkett, G Busettocc, P Bussey, A Buzatu, S Cabrerax, C Calancha, S Camarda, M Campanelli, M Campbell, F Canelli, A Canepa, B Carls, D Carlsmith, R Carosi, S Carrillok, S Carron, B Casal, M Casarsa, A Castrobb, P Catastini, D Cauz, V Cavaliereee, M Cavalli-Sforza, A Cerrif, L Cerritoq, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, K Cho, D Chokheli, JP Chou, WH Chung, YS Chung, CI Ciobanu, MA Ciocciee, A Clark, D Clark, G Compostellacc, ME Convery, J Conway, M Corbo, M Cordelli, CA Cox, DJ Cox, F Cresciolidd, C Cuenca Almenar, J Cuevasv, R Culbertson, D Dagenhart, N d'Ascenzot, M Datta, P de Barbaro, S De Cecco, G De Lorenzo, M Dell'Orsodd, C Deluca, L Demortier, J Dengc, M Deninno, F Devoto, M d'Erricocc, A Di Cantodd, B Di Ruzza, JR Dittmann, M D'Onofrio, S Donatidd, P Dong, T Dorigo, K Ebina, A Elagin, A Eppig, R Erbacher, D Errede, S Errede, N Ershaidataa, R Eusebi, HC Fang, S Farrington, M Feindt, JP Fernandez, C Ferrazzaff, R Field, G Flanaganr, R Forrest, MJ Frank, M Franklin, JC Freeman, I Furic, M Gallinaro, J Galyardt, JE Garcia, AF Garfinkel, P Garosiee, H Gerberich, E Gerchtein, S Giagugg, V Giakoumopoulou, P Giannetti, K Gibson, CM Ginsburg, N Giokaris, P Giromini, M Giunta, G Giurgiu, V Glagolev, D Glenzinski, M Gold, D Goldin, N Goldschmidt, A Golossanov, G Gomez, G Gomez-Ceballos, M Goncharov, O González, I Gorelov, AT Goshaw, K Goulianos, A Gresele, S Grinstein, C Grosso-Pilcher, RC Group, J Guimaraes da Costa, Z Gunay-Unalan, C Haber, SR Hahn, E Halkiadakis, A Hamaguchi, JY Han, F Happacher, K Hara, D Hare, M Hare, RF Harr, K Hatakeyama, C Hays, M Heck, J Heinrich, M Herndon, S Hewamanage, D Hidas, A Hocker, W Hopkins, D Horn, S Hou, RE Hughes, M Hurwitz, U Husemann, N Hussain, M Hussein, J Huston, G Introzzi, M Iorigg, A Ivanovo, E James, D Jang, B Jayatilaka, EJ Jeon, MK Jha, S Jindariani, W Johnson, M Jones, KK Joo, SY Jun, TR Junk, T Kamon, PE Karchin, Y Katon, W Ketchum, J Keung, V Khotilovich, B Kilminster, DH Kim, HS Kim, HW Kim, JE Kim, MJ Kim, SB Kim, SH Kim, YK Kim, N Kimura, S Klimenko, K Kondo, DJ Kong, J Konigsberg, A Korytov, AV Kotwal, M Kreps, J Kroll, D Krop, N Krumnackl, M Kruse, V Krutelyovd, T Kuhr, M Kurata, S Kwang, AT Laasanen, S Lami, S Lammel, M Lancaster, RL Lander, K Lannonu, A Lath, G Latinoee, I Lazzizzera, T LeCompte, E Lee, HS Lee, JS Lee, SW Leew, S Leodd, S Leone, JD Lewis, C-J Lin, J Linacre, M Lindgren, E Lipeles, A Lister, DO Litvintsev, C Liu, Q Liu, T Liu, S Lockwitz, NS Lockyer, A Loginov, D Lucchesicc, J Lueck, P Lujan, P Lukens, G Lungu, J Lys, R Lysak, R Madrak, K Maeshima, K Makhoul, P Maksimovic, S Malik, G Mancab, A Manousakis-Katsikakis, F Margaroli, C Marino, M Martínez, R Martínez-Ballarín, P Mastrandrea, M Mathis, ME Mattson, P Mazzanti, KS McFarland, P McIntyre, R McNultyi, A Mehta, P Mehtala, A Menzione, C Mesropian, T Miao, D Mietlicki, A Mitra, H Miyake, S Moed, N Moggi, MN Mondragonk, CS Moon, R Moore, MJ Morello, J Morlock, P Movilla Fernandez, A Mukherjee, Th Muller, P Murat, M Mussinibb, J Nachtmanm, Y Nagai, J Naganoma, I Nakano, A Napier, J Nett, C Neuz, MS Neubauer, J Nielsene, L Nodulman, O Norniella, E Nurse, L Oakes, SH Oh, YD Oh, I Oksuzian, T Okusawa, R Orava, L Ortolan, S Pagan Grisocc, C Pagliarone, E Palenciaf, V Papadimitriou, AA Paramonov, J Patrick, G Paulettahh, M Paulini, C Paus, DE Pellett, A Penzo, TJ Phillips, G Piacentino, E Pianori, J Pilot, K Pitts, C Plager, L Pondrom, S Poprocki, K Potamianos, O Poukhov, F Prokoshiny, A Pronko, F Ptohosh, E Pueschel, G Punzidd, J Pursley, A Rahaman, V Ramakrishnan, N Ranjan, I Redondo, P Renton, M Rescigno, F Rimondibb, L Ristori, A Robson, T Rodrigo, T Rodriguez, E Rogers, S Rolli, R Roser, M Rossi, F Ruffiniee, A Ruiz, J Russ, V Rusu, A Safonov, WK Sakumoto, L Santihh, L Sartori, K Sato, V Savelievt, A Savoy-Navarro, P Schlabach, A Schmidt, EE Schmidt, MP Schmidt, M Schmitt, T Schwarz, L Scodellaro, A Scribanoee, F Scuri, A Sedov, S Seidel, Y Seiya, A Semenov, F Sforzadd, A Sfyrla, SZ Shalhout, T Shears, PF Shepard, M Shimojimas, S Shiraishi, M Shochet, I Shreyber, A Simonenko, P Sinervo, A Sissakian, K Sliwa, JR Smith, FD Snider, A Soha, S Somalwar, V Sorin, P Squillacioti, M Stanitzki, R St Denis, B Stelzer, O Stelzer-Chilton, D Stentz, J Strologas, GL Strycker, Y Sudo, A Sukhanov, I Suslov, K Takemasa, Y Takeuchi, J Tang, M Tecchio, PK Teng, J Thom, J Thome, GA Thompson, E Thomson, P Ttito-Guzmán, S Tkaczyk, D Toback, S Tokar, K Tollefson, T Tomura, D Tonelli, S Torre, D Torretta, P Totarohh, M Trovatoff, Y Tu, N Turiniee, F Ukegawa, S Uozumi, A Varganov, E Vatagaff, F Vázquez, G Velev, C Vellidis, M Vidal, I Vila, R Vilar, M Vogel, G Volpidd, P Wagner, RL Wagner, T Wakisaka, R Wallny, SM Wang, A Warburton, D Waters, M Weinberger, WC Wester, B Whitehouse, D Whitesonc, AB Wicklund, E Wicklund, S Wilbur, F Wick, HH Williams, JS Wilson, P Wilson, BL Winer, P Wittich, S Wolbers, H Wolfe, T Wright, X Wu, Z Wu, K Yamamoto, J Yamaoka, T Yang, UK Yangp, YC Yang, W-M Yao, GP Yeh, K Yim, J Yoh, K Yorita, T Yoshidaj, GB Yu, I Yu, SS Yu, JC Yun, A Zanetti, Y Zeng, S Zucchelli

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Measurement of the top-quark mass in the lepton+jets channel using a matrix element technique with the CDF II detector

(2011)

Authors:

CDF Collaboration, T Aaltonen, B Álvarez Gonzálezv, S Amerio, D Amidei, A Anastassov, A Annovi, J Antos, G Apollinari, JA Appel, A Apresyan, T Arisawa, A Artikov, J Asaadi, W Ashmanskas, B Auerbach, A Aurisano, F Azfar, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, P Barriaee, P Bartos, M Baucecc, G Bauer, F Bedeschi, D Beecher, S Behari, G Bellettinidd, J Bellinger, D Benjamin, A Beretvas, A Bhatti, M Binkley, D Bisellocc, I Bizjakii, KR Bland, C Blocker, B Blumenfeld, A Bocci, A Bodek, D Bortoletto, J Boudreau, A Boveia, B Braua, L Brigliadoribb, A Brisuda, C Bromberg, E Brucken, M Bucciantoniodd, J Budagov, HS Budd, S Budd, K Burkett, G Busettocc, P Bussey, A Buzatu, S Cabrerax, C Calancha, S Camarda, M Campanelli, M Campbell, F Canelli, A Canepa, B Carls, D Carlsmith, R Carosi, S Carrillok, S Carron, B Casal, M Casarsa, A Castrobb, P Catastini, D Cauz, V Cavaliereee, M Cavalli-Sforza, A Cerrif, L Cerritoq, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, K Cho, D Chokheli, JP Chou, WH Chung, YS Chung, CI Ciobanu, MA Ciocciee, A Clark, D Clark, G Compostellacc, ME Convery, J Conway, M Corbo, M Cordelli, CA Cox, DJ Cox, F Cresciolidd, C Cuenca Almenar, J Cuevasv, R Culbertson, D Dagenhart, N d'Ascenzot, M Datta, P de Barbaro, S De Cecco, G De Lorenzo, M Dell'Orsodd, C Deluca, L Demortier, J Dengc, M Deninno, F Devoto, M d'Erricocc, A Di Cantodd, B Di Ruzza, JR Dittmann, M D'Onofrio, S Donatidd, P Dong, T Dorigo, K Ebina, A Elagin, A Eppig, R Erbacher, D Errede, S Errede, N Ershaidataa, R Eusebi, HC Fang, S Farrington, M Feindt, JP Fernandez, C Ferrazzaff, R Field, G Flanaganr, R Forrest, MJ Frank, M Franklin, JC Freeman, I Furic, M Gallinaro, J Galyardt, JE Garcia, AF Garfinkel, P Garosiee, H Gerberich, E Gerchtein, S Giagugg, V Giakoumopoulou, P Giannetti, K Gibson, CM Ginsburg, N Giokaris, P Giromini, M Giunta, G Giurgiu, V Glagolev, D Glenzinski, M Gold, D Goldin, N Goldschmidt, A Golossanov, G Gomez, G Gomez-Ceballos, M Goncharov, O González, I Gorelov, AT Goshaw, K Goulianos, A Gresele, S Grinstein, C Grosso-Pilcher, RC Group, J Guimaraes da Costa, Z Gunay-Unalan, C Haber, SR Hahn, E Halkiadakis, A Hamaguchi, JY Han, F Happacher, K Hara, D Hare, M Hare, RF Harr, K Hatakeyama, C Hays, M Heck, J Heinrich, M Herndon, S Hewamanage, D Hidas, A Hocker, W Hopkinsg, D Horn, S Hou, RE Hughes, M Hurwitz, U Husemann, N Hussain, M Hussein, J Huston, G Introzzi, M Iorigg, A Ivanovo, E James, D Jang, B Jayatilaka, EJ Jeon, MK Jha, S Jindariani, W Johnson, M Jones, KK Joo, SY Jun, TR Junk, T Kamon, PE Karchin, Y Katon, W Ketchum, J Keung, V Khotilovich, B Kilminster, DH Kim, HS Kim, HW Kim, JE Kim, MJ Kim, SB Kim, SH Kim, YK Kim, N Kimura, S Klimenko, K Kondo, DJ Kong, J Konigsberg, A Korytov, AV Kotwal, M Kreps, J Kroll, D Krop, N Krumnackl, M Kruse, V Krutelyovd, T Kuhr, M Kurata, S Kwang, AT Laasanen, S Lami, S Lammel, M Lancaster, RL Lander, K Lannonu, A Lath, G Latinoee, I Lazzizzera, T LeCompte, E Lee, HS Lee, JS Lee, SW Leew, S Leodd, S Leone, JD Lewis, C-J Lin, J Linacre, M Lindgren, E Lipeles, A Lister, DO Litvintsev, C Liu, Q Liu, T Liu, S Lockwitz, NS Lockyer, A Loginov, D Lucchesicc, J Lueck, P Lujan, P Lukens, G Lungu, J Lys, R Lysak, R Madrak, K Maeshima, K Makhoul, P Maksimovic, S Malik, G Mancab, A Manousakis-Katsikakis, F Margaroli, C Marino, M Martínez, R Martínez-Ballarín, P Mastrandrea, M Mathis, ME Mattson, P Mazzanti, KS McFarland, P McIntyre, R McNultyi, A Mehta, P Mehtala, A Menzione, C Mesropian, T Miao, D Mietlicki, A Mitra, H Miyake, S Moed, N Moggi, MN Mondragonk, CS Moon, R Moore, MJ Morello, J Morlock, P Movilla Fernandez, A Mukherjee, Th Muller, P Murat, M Mussinibb, J Nachtmanm, Y Nagai, J Naganoma, I Nakano, A Napier, J Nett, C Neuz, MS Neubauer, J Nielsene, L Nodulman, O Norniella, E Nurse, L Oakes, SH Oh, YD Oh, I Oksuzian, T Okusawa, R Orava, L Ortolan, S Pagan Grisocc, C Pagliarone, E Palenciaf, V Papadimitriou, AA Paramonov, J Patrick, G Paulettahh, M Paulini, C Paus, DE Pellett, A Penzo, TJ Phillips, G Piacentino, E Pianori, J Pilot, K Pitts, C Plager, L Pondrom, K Potamianos, O Poukhov, F Prokoshiny, A Pronko, F Ptohosh, E Pueschel, G Punzidd, J Pursley, A Rahaman, V Ramakrishnan, N Ranjan, I Redondo, P Renton, M Rescigno, F Rimondibb, L Ristori, A Robson, T Rodrigo, T Rodriguez, E Rogers, S Rolli, R Roser, M Rossi, F Ruffiniee, A Ruiz, J Russ, V Rusu, A Safonov, WK Sakumoto, L Santihh, L Sartori, K Sato, V Savelievt, A Savoy-Navarro, P Schlabach, A Schmidt, EE Schmidt, MP Schmidt, M Schmitt, T Schwarz, L Scodellaro, A Scribanoee, F Scuri, A Sedov, S Seidel, Y Seiya, A Semenov, F Sforzadd, A Sfyrla, SZ Shalhout, T Shears, PF Shepard, M Shimojimas, S Shiraishi, M Shochet, I Shreyber, A Simonenko, P Sinervo, A Sissakian, K Sliwa, JR Smith, FD Snider, A Soha, S Somalwar, V Sorin, P Squillacioti, M Stanitzki, R St Denis, B Stelzer, O Stelzer-Chilton, D Stentz, J Strologas, GL Strycker, Y Sudo, A Sukhanov, I Suslov, K Takemasa, Y Takeuchi, J Tang, M Tecchio, PK Teng, J Thomg, J Thome, GA Thompson, E Thomson, P Ttito-Guzmán, S Tkaczyk, D Toback, S Tokar, K Tollefson, T Tomura, D Tonelli, S Torre, D Torretta, P Totarohh, M Trovatoff, Y Tu, N Turiniee, F Ukegawa, S Uozumi, A Varganov, E Vatagaff, F Vázquez, G Velev, C Vellidis, M Vidal, I Vila, R Vilar, M Vogel, G Volpidd, P Wagner, RL Wagner, T Wakisaka, R Wallny, SM Wang, A Warburton, D Waters, M Weinberger, WC Wester, B Whitehouse, D Whitesonc, AB Wicklund, E Wicklund, S Wilbur, F Wick, HH Williams, JS Wilson, P Wilson, BL Winer, P Wittichg, S Wolbers, H Wolfe, T Wright, X Wu, Z Wu, K Yamamoto, J Yamaoka, T Yang, UK Yangp, YC Yang, W-M Yao, GP Yeh, K Yim, J Yoh, K Yorita, T Yoshidaj, GB Yu, I Yu, SS Yu, JC Yun, A Zanetti, Y Zeng, S Zucchelli

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Professor Chris Hays

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Evidence for tt̄γ production and measurement of σtt̄γ/σtt̄

Authors:

Abstract:

Observation of the Ξb0 baryon

Authors:

Abstract:

Measurement of the tt̄ production cross section in pp̄ collisions at √s=1.96TeV using events with large missing transverse energy and jets

Authors:

Abstract:

Search for WZ+ZZ production with MET + jets with b enhancement at sqrt(s) = 1.96 TeV

Authors:

Measurement of the top-quark mass in the lepton+jets channel using a matrix element technique with the CDF II detector

Authors:

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Professor Chris Hays

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Evidence for tt̄γ production and measurement of σtt̄γ/σtt̄

Authors:

Abstract:

Observation of the Ξb0 baryon

Authors:

Abstract:

Measurement of the tt̄ production cross section in pp̄ collisions at √s=1.96TeV using events with large missing transverse energy and jets

Authors:

Abstract:

Search for WZ+ZZ production with MET + jets with b enhancement at sqrt(s) = 1.96 TeV

Authors:

Measurement of the top-quark mass in the lepton+jets channel using a matrix element technique with the CDF II detector

Authors: