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Measurement of the Differential Cross Section d{\sigma}/d(cos {\theta}t) for Top-Quark Pair Production in p-pbar Collisions at sqrt{s} = 1.96 TeV

(2013)

Authors:

CDF Collaboration, T Aaltonen, S Amerio, D Amidei, A Anastassov, A Annovi, J Antos, G Apollinari, JA Appel, T Arisawa, A Artikov, J Asaadi, W Ashmanskas, B Auerbach, A Aurisano, F Azfar, W Badgett, T Bae, A Barbaro-Galtieri, VE Barnes, BA Barnett, P Barria, P Bartos, M Bauce, F Bedeschi, S Behari, G Bellettini, J Bellinger, D Benjamin, A Beretvas, A Bhatti, KR Bland, B Blumenfeld, A Bocci, A Bodek, D Bortoletto, J Boudreau, A Boveia, L Brigliadori, C Bromberg, E Brucken, J Budagov, HS Budd, K Burkett, G Busetto, P Bussey, P Butti, A Buzatu, A Calamba, S Camarda, M Campanelli, F Canelli, B Carls, D Carlsmith, R Carosi, S Carrillo, 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, K Cho, D Chokheli, A Clark, C Clarke, ME Convery, J Conway, M Corbo, M Cordelli, CA Cox, DJ Cox, M Cremonesi, D Cruz, J Cuevas, R Culbertson, N d'Ascenzo, M Datta, P de Barbaro, L Demortier, M Deninno, M D'Errico, F Devoto, A Di Canto, B Di Ruzza, JR Dittmann, S Donati, M D'Onofrio, M Dorigo, A Driutti, K Ebina, R Edgar, A Elagin, R Erbacher, S Errede, B Esham, S Farrington, JP Fernández Ramos, R Field, G Flanagan, R Forrest, M Franklin, JC Freeman, H Frisch, Y Funakoshi, C Galloni, AF Garfinkel, P Garosi, H Gerberich, E Gerchtein, S Giagu, V Giakoumopoulou, K Gibson, CM Ginsburg, N Giokaris, P Giromini, G Giurgiu, V Glagolev, D Glenzinski, M Gold, D Goldin, A Golossanov, G Gomez, G Gomez-Ceballos, M Goncharov, O González López, I Gorelov, AT Goshaw, K Goulianos, E Gramellini, S Grinstein, C Grosso-Pilcher, RC Group, J Guimaraes da Costa, SR Hahn, JY Han, F Happacher, K Hara, M Hare, RF Harr, T Harrington-Taber, K Hatakeyama, C Hays, J Heinrich, M Herndon, A Hocker, Z Hong, W Hopkins, S Hou, RE Hughes, U Husemann, M Hussein, J Huston, G Introzzi, M Iori, A Ivanov, E James, D Jang, B Jayatilaka, EJ Jeon, S Jindariani, M Jones, KK Joo, SY Jun, TR Junk, M Kambeitz, T Kamon, PE Karchin, A Kasmi, Y Kato, W Ketchum, J Keung, B Kilminster, DH Kim, HS Kim, JE Kim, MJ Kim, SH Kim, SB Kim, YJ Kim, YK Kim, N Kimura, M Kirby, K Knoepfel, K Kondo, DJ Kong, J Konigsberg, AV Kotwal, M Kreps, J Kroll, M Kruse, T Kuhr, M Kurata, AT Laasanen, S Lammel, M Lancaster, K Lannon, G Latino, HS Lee, JS Lee, S Leo, S Leone, JD Lewis, A Limosani, E Lipeles, A Lister, H Liu, Q Liu, T Liu, S Lockwitz, A Loginov, D Lucchesi, A Lucà, J Lueck, P Lujan, P Lukens, G Lungu, J Lys, R Lysak, R Madrak, P Maestro, S Malik, G Manca, A Manousakis-Katsikakis, L Marchese, F Margaroli, P Marino, M Martínez, K Matera, ME Mattson, A Mazzacane, P Mazzanti, R McNulty, A Mehta, P Mehtala, C Mesropian, T Miao, D Mietlicki, A Mitra, H Miyake, S Moed, N Moggi, CS Moon, R Moore, MJ Morello, A Mukherjee, Th Muller, P Murat, M Mussini, J Nachtman, Y Nagai, J Naganoma, I Nakano, A Napier, J Nett, C Neu, T Nigmanov, L Nodulman, SY Noh, O Norniella, L Oakes, SH Oh, YD Oh, I Oksuzian, T Okusawa, R Orava, L Ortolan, C Pagliarone, E Palencia, P Palni, V Papadimitriou, W Parker, G Pauletta, M Paulini, C Paus, TJ Phillips, G Piacentino, E Pianori, J Pilot, K Pitts, C Plager, L Pondrom, S Poprocki, K Potamianos, A Pranko, F Prokoshin, F Ptohos, G Punzi, N Ranjan, I Redondo Fernández, P Renton, M Rescigno, F Rimondi, L Ristori, A Robson, T Rodriguez, S Rolli, M Ronzani, R Roser, JL Rosner, F Ruffini, A Ruiz, J Russ, V Rusu, WK Sakumoto, Y Sakurai, L Santi, K Sato, V Saveliev, A Savoy-Navarro, P Schlabach, EE Schmidt, T Schwarz, L Scodellaro, F Scuri, S Seidel, Y Seiya, A Semenov, F Sforza, SZ Shalhout, T Shears, PF Shepard, M Shimojima, M Shochet, I Shreyber-Tecker, A Simonenko, K Sliwa, JR Smith, FD Snider, H Song, V Sorin, R St Denis, M Stancari, D Stentz, J Strologas, Y Sudo, A Sukhanov, I Suslov, K Takemasa, Y Takeuchi, J Tang, M Tecchio, PK Teng, J Thom, E Thomson, V Thukral, D Toback, S Tokar, K Tollefson, T Tomura, D Tonelli, S Torre, D Torretta, P Totaro, M Trovato, F Ukegawa, S Uozumi, G Velev, C Vellidis, C Vernieri, M Vidal, R Vilar, J Vizán, M Vogel, G Volpi, F Vázquez, P Wagner, R Wallny, SM Wang, D Waters, WC Wester, D Whiteson, AB Wicklund, S Wilbur, HH Williams, JS Wilson, P Wilson, BL Winer, P Wittich, S Wolbers, H Wolfe, T Wright, X Wu, Z Wu, K Yamamoto, D Yamato, T Yang, UK Yang, YC Yang, W-M Yao, GP Yeh, K Yi, J Yoh, K Yorita, T Yoshida, GB Yu, I Yu, AM Zanetti, Y Zeng, C Zhou, S Zucchelli

Measurement of the Differential Cross Section dσ/d(cos θt) for Top-Quark Pair Production in p-pbar Collisions at sqrt{s} = 1.96 TeV

ArXiv 1306.2357 (2013)

Authors:

CDF Collaboration, T Aaltonen, S Amerio, D Amidei, A Anastassov, A Annovi, J Antos, G Apollinari, JA Appel, T Arisawa, A Artikov, J Asaadi, W Ashmanskas, B Auerbach, A Aurisano, F Azfar, W Badgett, T Bae, A Barbaro-Galtieri, VE Barnes, BA Barnett, P Barria, P Bartos, M Bauce, F Bedeschi, S Behari, G Bellettini, J Bellinger, D Benjamin, A Beretvas, A Bhatti, KR Bland, B Blumenfeld, A Bocci, A Bodek, D Bortoletto, J Boudreau, A Boveia, L Brigliadori, C Bromberg, E Brucken, J Budagov, HS Budd, K Burkett, G Busetto, P Bussey, P Butti, A Buzatu, A Calamba, S Camarda, M Campanelli, F Canelli, B Carls, D Carlsmith, R Carosi, S Carrillo, 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, K Cho, D Chokheli, A Clark, C Clarke, ME Convery, J Conway, M Corbo, M Cordelli, CA Cox, DJ Cox, M Cremonesi, D Cruz, J Cuevas, R Culbertson, N d'Ascenzo, M Datta, P de Barbaro, L Demortier, M Deninno, M D'Errico, F Devoto, A Di Canto, B Di Ruzza, JR Dittmann, S Donati, M D'Onofrio, M Dorigo, A Driutti, K Ebina, R Edgar, A Elagin, R Erbacher, S Errede, B Esham, S Farrington, JP Fernández Ramos, R Field, G Flanagan, R Forrest, M Franklin, JC Freeman, H Frisch, Y Funakoshi, C Galloni, AF Garfinkel, P Garosi, H Gerberich, E Gerchtein, S Giagu, V Giakoumopoulou, K Gibson, CM Ginsburg, N Giokaris, P Giromini, G Giurgiu, V Glagolev, D Glenzinski, M Gold, D Goldin, A Golossanov, G Gomez, G Gomez-Ceballos, M Goncharov, O González López, I Gorelov, AT Goshaw, K Goulianos, E Gramellini, S Grinstein, C Grosso-Pilcher, RC Group, J Guimaraes da Costa, SR Hahn, JY Han, F Happacher, K Hara, M Hare, RF Harr, T Harrington-Taber, K Hatakeyama, C Hays, J Heinrich, M Herndon, A Hocker, Z Hong, W Hopkins, S Hou, RE Hughes, U Husemann, M Hussein, J Huston, G Introzzi, M Iori, A Ivanov, E James, D Jang, B Jayatilaka, EJ Jeon, S Jindariani, M Jones, KK Joo, SY Jun, TR Junk, M Kambeitz, T Kamon, PE Karchin, A Kasmi, Y Kato, W Ketchum, J Keung, B Kilminster, DH Kim, HS Kim, JE Kim, MJ Kim, SH Kim, SB Kim, YJ Kim, YK Kim, N Kimura, M Kirby, K Knoepfel, K Kondo, DJ Kong, J Konigsberg, AV Kotwal, M Kreps, J Kroll, M Kruse, T Kuhr, M Kurata, AT Laasanen, S Lammel, M Lancaster, K Lannon, G Latino, HS Lee, JS Lee, S Leo, S Leone, JD Lewis, A Limosani, E Lipeles, A Lister, H Liu, Q Liu, T Liu, S Lockwitz, A Loginov, D Lucchesi, A Lucà, J Lueck, P Lujan, P Lukens, G Lungu, J Lys, R Lysak, R Madrak, P Maestro, S Malik, G Manca, A Manousakis-Katsikakis, L Marchese, F Margaroli, P Marino, M Martínez, K Matera, ME Mattson, A Mazzacane, P Mazzanti, R McNulty, A Mehta, P Mehtala, C Mesropian, T Miao, D Mietlicki, A Mitra, H Miyake, S Moed, N Moggi, CS Moon, R Moore, MJ Morello, A Mukherjee, Th Muller, P Murat, M Mussini, J Nachtman, Y Nagai, J Naganoma, I Nakano, A Napier, J Nett, C Neu, T Nigmanov, L Nodulman, SY Noh, O Norniella, L Oakes, SH Oh, YD Oh, I Oksuzian, T Okusawa, R Orava, L Ortolan, C Pagliarone, E Palencia, P Palni, V Papadimitriou, W Parker, G Pauletta, M Paulini, C Paus, TJ Phillips, G Piacentino, E Pianori, J Pilot, K Pitts, C Plager, L Pondrom, S Poprocki, K Potamianos, A Pranko, F Prokoshin, F Ptohos, G Punzi, N Ranjan, I Redondo Fernández, P Renton, M Rescigno, F Rimondi, L Ristori, A Robson, T Rodriguez, S Rolli, M Ronzani, R Roser, JL Rosner, F Ruffini, A Ruiz, J Russ, V Rusu, WK Sakumoto, Y Sakurai, L Santi, K Sato, V Saveliev, A Savoy-Navarro, P Schlabach, EE Schmidt, T Schwarz, L Scodellaro, F Scuri, S Seidel, Y Seiya, A Semenov, F Sforza, SZ Shalhout, T Shears, PF Shepard, M Shimojima, M Shochet, I Shreyber-Tecker, A Simonenko, K Sliwa, JR Smith, FD Snider, H Song, V Sorin, R St Denis, M Stancari, D Stentz, J Strologas, Y Sudo, A Sukhanov, I Suslov, K Takemasa, Y Takeuchi, J Tang, M Tecchio, PK Teng, J Thom, E Thomson, V Thukral, D Toback, S Tokar, K Tollefson, T Tomura, D Tonelli, S Torre, D Torretta, P Totaro, M Trovato, F Ukegawa, S Uozumi, G Velev, C Vellidis, C Vernieri, M Vidal, R Vilar, J Vizán, M Vogel, G Volpi, F Vázquez, P Wagner, R Wallny, SM Wang, D Waters, WC Wester, D Whiteson, AB Wicklund, S Wilbur, HH Williams, JS Wilson, P Wilson, BL Winer, P Wittich, S Wolbers, H Wolfe, T Wright, X Wu, Z Wu, K Yamamoto, D Yamato, T Yang, UK Yang, YC Yang, W-M Yao, GP Yeh, K Yi, J Yoh, K Yorita, T Yoshida, GB Yu, I Yu, AM Zanetti, Y Zeng, C Zhou, S Zucchelli

Abstract:

We report a measurement of the differential cross section, dσ/d(cos θt), for top-quark-pair production as a function of the top-quark production angle in proton-antiproton collisions at sqrt{s} = 1.96 TeV. This measurement is performed using data collected with the CDF II detector at the Tevatron, corresponding to an integrated luminosity of 9.4/fb. We employ the Legendre polynomials to characterize the shape of the differential cross section at the parton level. The observed Legendre coefficients are in good agreement with the prediction of the next-to-leading-order standard-model calculation, with the exception of an excess linear-term coefficient, a1 = 0.40 +- 0.12, compared to the standard-model prediction of a1 = 0.15^{+0.07}_{-0.03}.

Spectroscopic observations of sn 2012fr: A luminous, normal type ia supernova with early high-velocity features and a late velocity plateau

Astrophysical Journal 770:1 (2013)

Authors:

MJ Childress, RA Scalzo, SA Sim, BE Tucker, F Yuan, BP Schmidt, SB Cenko, JM Silverman, C Contreras, EY Hsiao, M Phillips, N Morrell, SW Jha, C McCully, AV Filippenko, JP Anderson, S Benetti, F Bufano, T De Jaeger, F Forster, A Gal-Yam, L Le Guillou, K Maguire, J Maund, PA Mazzali, G Pignata, S Smartt, J Spyromilio, M Sullivan, F Taddia, S Valenti, DDR Bayliss, M Bessell, GA Blanc, DJ Carson, KI Clubb, C De Burgh-Day, TD Desjardins, JJ Fang, OD Fox, EL Gates, IT Ho, S Keller, PL Kelly, C Lidman, NS Loaring, JR Mould, M Owers, S Ozbilgen, L Pei, T Pickering, MB Pracy, JA Rich, BE Schaefer, N Scott, M Stritzinger, FPA Vogt, G Zhou

Abstract:

We present 65 optical spectra of the Type Ia SN 2012fr, 33 of which were obtained before maximum light. At early times, SN 2012fr shows clear evidence of a high-velocity feature (HVF) in the Si II λ6355 line that can be cleanly decoupled from the lower velocity "photospheric" component. This Si II λ6355 HVF fades by phase -5; subsequently, the photospheric component exhibits a very narrow velocity width and remains at a nearly constant velocity of 12,000 km s-1 until at least five weeks after maximum brightness. The Ca II infrared triplet exhibits similar evidence for both a photospheric component at v 12,000 km s-1 with narrow line width and long velocity plateau, as well as an HVF beginning at v 31,000 km s-1 two weeks before maximum. SN 2012fr resides on the border between the "shallow silicon" and "core-normal" subclasses in the Branch et al. classification scheme, and on the border between normal and high-velocity Type Ia supernovae (SNe Ia) in the Wang et al. system. Though it is a clear member of the "low velocity gradient" group of SNe Ia and exhibits a very slow light-curve decline, it shows key dissimilarities with the overluminous SN 1991T or SN 1999aa subclasses of SNe Ia. SN 2012fr represents a well-observed SN Ia at the luminous end of the normal SN Ia distribution and a key transitional event between nominal spectroscopic subclasses of SNe Ia. © 2013. The American Astronomical Society. All rights reserved..

The Hot and Energetic Universe: A White Paper presenting the science theme motivating the Athena+ mission

(2013)

Authors:

Kirpal Nandra, Didier Barret, Xavier Barcons, Andy Fabian, Jan-Willem den Herder, Luigi Piro, Mike Watson, Christophe Adami, James Aird, Jose Manuel Afonso, Dave Alexander, Costanza Argiroffi, Lorenzo Amati, Monique Arnaud, Jean-Luc Atteia, Marc Audard, Carles Badenes, Jean Ballet, Lucia Ballo, Aya Bamba, Anil Bhardwaj, Elia Stefano Battistelli, Werner Becker, Michaël De Becker, Ehud Behar, Stefano Bianchi, Veronica Biffi, Laura Bîrzan, Fabrizio Bocchino, Slavko Bogdanov, Laurence Boirin, Thomas Boller, Stefano Borgani, Katharina Borm, Nicolas Bouché, Hervé Bourdin, Richard Bower, Valentina Braito, Enzo Branchini, Graziella Branduardi-Raymont, Joel Bregman, Laura Brenneman, Murray Brightman, Marcus Brüggen, Johannes Buchner, Esra Bulbul, Marcella Brusa, Michal Bursa, Alessandro Caccianiga, Ed Cackett, Sergio Campana, Nico Cappelluti, Massimo Cappi, Francisco Carrera, Maite Ceballos, Finn Christensen, You-Hua Chu, Eugene Churazov, Nicolas Clerc, Stephane Corbel, Amalia Corral, Andrea Comastri, Elisa Costantini, Judith Croston, Mauro Dadina, Antonino D'Ai, Anne Decourchelle, Roberto Della Ceca, Konrad Dennerl, Klaus Dolag, Chris Done, Michal Dovciak, Jeremy Drake, Dominique Eckert, Alastair Edge, Stefano Ettori, Yuichiro Ezoe, Eric Feigelson, Rob Fender, Chiara Feruglio, Alexis Finoguenov, Fabrizio Fiore, Massimiliano Galeazzi, Sarah Gallagher, Poshak Gandhi, Massimo Gaspari, Fabio Gastaldello, Antonis Georgakakis, Ioannis Georgantopoulos, Marat Gilfanov, Myriam Gitti, Randy Gladstone, Rene Goosmann, Eric Gosset, Nicolas Grosso, Manuel Guedel, Martin Guerrero, Frank Haberl, Martin Hardcastle, Sebastian Heinz, Almudena Alonso Herrero, Anthony Hervé, Mats Holmstrom, Kazushi Iwasawa, Peter Jonker, Jelle Kaastra, Erin Kara, Vladimir Karas, Joel Kastner, Andrew King, Daria Kosenko, Dimita Koutroumpa, Ralph Kraft, Ingo Kreykenbohm, Rosine Lallement, Giorgio Lanzuisi, J Lee, Marianne Lemoine-Goumard, Andrew Lobban, Giuseppe Lodato, Lorenzo Lovisari, Simone Lotti, Ian McCharthy, Brian McNamara, Antonio Maggio, Roberto Maiolino, Barbara De Marco, Domitilla de Martino, Silvia Mateos, Giorgio Matt, Ben Maughan, Pasquale Mazzotta, Mariano Mendez, Andrea Merloni, Giuseppina Micela, Marco Miceli, Robert Mignani, Jon Miller, Giovanni Miniutti, Silvano Molendi, Rodolfo Montez, Alberto Moretti, Christian Motch, Yaël Nazé, Jukka Nevalainen, Fabrizio Nicastro, Paul Nulsen, Takaya Ohashi, Paul O'Brien, Julian Osborne, Lida Oskinova, Florian Pacaud, Frederik Paerels, Mat Page, Iossif Papadakis, Giovanni Pareschi, Robert Petre, Pierre-Olivier Petrucci, Enrico Piconcelli, Ignazio Pillitteri, C Pinto, Jelle de Plaa, Etienne Pointecouteau, Trevor Ponman, Gabriele Ponti, Delphine Porquet, Ken Pounds, Gabriel Pratt, Peter Predehl, Daniel Proga, Dimitrios Psaltis, David Rafferty, Miriam Ramos-Ceja, Piero Ranalli, Elena Rasia, Arne Rau, Gregor Rauw, Nanda Rea, Andy Read, James Reeves, Thomas Reiprich, Matthieu Renaud, Chris Reynolds, Guido Risaliti, Jerome Rodriguez, Paola Rodriguez Hidalgo, Mauro Roncarelli, David Rosario, Mariachiara Rossetti, Agata Rozanska, Emmanouil Rovilos, Ruben Salvaterra, Mara Salvato, Tiziana Di Salvo, Jeremy Sanders, Jorge Sanz-Forcada, Kevin Schawinski, Joop Schaye, Axel Schwope, Salvatore Sciortino, Paola Severgnini, Francesco Shankar, Debora Sijacki, Stuart Sim, Christian Schmid, Randall Smith, Andrew Steiner, Beate Stelzer, Gordon Stewart, Tod Strohmayer, Lothar Strüder, Ming Sun, Yoh Takei, V Tatischeff, Andreas Tiengo, Francesco Tombesi, Ginevra Trinchieri, TG Tsuru, Asif Ud-Doula, Eugenio Ursino, Lynne Valencic, Eros Vanzella, Simon Vaughan, Cristian Vignali, Jacco Vink, Fabio Vito, Marta Volonteri, Daniel Wang, Natalie Webb, Richard Willingale, Joern Wilms, Michael Wise, Diana Worrall, Andrew Young, Luca Zampieri, Jean In't Zand, Silvia Zane, Andreas Zezas, Yuying Zhang, Irina Zhuravleva

The Hot and Energetic Universe: Luminous extragalactic transients

(2013)

Authors:

Peter Jonker, Paul O'Brien, Lorenzo Amati, Jean-Luc Atteia, Sergio Campana, Phil Evans, Rob Fender, Chryssa Kouveliotou, Giuseppe Lodato, Julian Osborne, Luigi Piro, Arne Rau, Nial Tanvir, Richard Willingale