Impact of low-$x$ resummation on QCD analysis of HERA data

(2018)

Authors:

xFitter Developers' team, :, Hamed Abdolmaleki, Valerio Bertone, Daniel Britzger, Stefano Camarda, Amanda Cooper-Sarkar, Francesco Giuli, Alexander Glazov, Aleksander Kusina, Agnieszka Luszczak, Fred Olness, Andrey Sapronov, Pavel Shvydkin, Katarzyna Wichmann, Oleksandr Zenaiev, Marco Bonvini

Parton distributions and lattice QCD calculations: A community white paper

Progress in Particle and Nuclear Physics Elsevier 100 (2018) 107-160

Authors:

Amanda M Cooper-Sarkar, M Constantinou, L Del Debbio, M Engelhardt, A Accardi, K Orginos, J-W Chen, G Bozzi, J Rojo, I Schienbein, G Schierholz, W Vogelsang, RS Thorne, S Collins, J-W Qiu, J Green, P Nadolsky, T Ishikawa, ER Nocera, F Olness, H-W Lin, A Kusina, R Gupta, Lucian A Harland-Lang, C Alexandrou

Abstract:

In the framework of quantum chromodynamics (QCD), parton distribution functions (PDFs) quantify how the momentum and spin of a hadron are divided among its quark and gluon constituents. Two main approaches exist to determine PDFs. The first approach, based on QCD factorization theorems, realizes a QCD analysis of a suitable set of hard-scattering measurements, often using a variety of hadronic observables. The second approach, based on first-principle operator definitions of PDFs, uses lattice QCD to compute directly some PDF-related quantities, such as their moments. Motivated by recent progress in both approaches, in this document we present an overview of lattice-QCD and global-analysis techniques used to determine unpolarized and polarized proton PDFs and their moments. We provide benchmark numbers to validate present and future lattice-QCD calculations and we illustrate how they could be used to reduce the PDF uncertainties in current unpolarized and polarized global analyses. This document represents a first step towards establishing a common language between the two communities, to foster dialogue and to further improve our knowledge of PDFs.

Combined Forward-Backward Asymmetry Measurements in Top-Antitop Quark Production at the Tevatron

Physical Review Letters American Physical Society (APS) 120:4 (2018) 042001

Authors:

T Aaltonen, VM Abazov, B Abbott, BS Acharya, M Adams, T Adams, JP Agnew, GD Alexeev, G Alkhazov, A Alton, S Amerio, D Amidei, A Anastassov, A Annovi, J Antos, G Apollinari, JA Appel, T Arisawa, A Artikov, J Asaadi, W Ashmanskas, A Askew, S Atkins, B Auerbach, K Augsten, A Aurisano, V Aushev, Y Aushev, C Avila, F Azfar, F Badaud, W Badgett, T Bae, L Bagby, B Baldin, DV Bandurin, S Banerjee, A Barbaro-Galtieri, E Barberis, P Baringer, VE Barnes, BA Barnett, P Barria, JF Bartlett, P Bartos, U Bassler, M Bauce, V Bazterra, A Bean, F Bedeschi, M Begalli, S Behari, L Bellantoni, G Bellettini, J Bellinger, D Benjamin, A Beretvas, SB Beri, G Bernardi, R Bernhard, I Bertram, M Besançon, R Beuselinck, PC Bhat, S Bhatia, V Bhatnagar, A Bhatti, KR Bland, G Blazey, S Blessing, K Bloom, B Blumenfeld, A Bocci, A Bodek, A Boehnlein, D Boline, EE Boos, G Borissov, D Bortoletto, M Borysova, J Boudreau, A Boveia, A Brandt, O Brandt, L Brigliadori, M Brochmann, R Brock, C Bromberg, A Bross, D Brown, E Brucken, XB Bu, J Budagov, HS Budd, M Buehler, V Buescher, V Bunichev, S Burdin, K Burkett, G Busetto, P Bussey, CP Buszello, P Butti, A Buzatu, A Calamba, E Camacho-Pérez, S Camarda, M Campanelli, F Canelli, B Carls, D Carlsmith, R Carosi, S Carrillo, B Casal, M Casarsa, BCK Casey, H Castilla-Valdez, A Castro, P Catastini, S Caughron, D Cauz, V Cavaliere, A Cerri, L Cerrito, S Chakrabarti, KM Chan, A Chandra, A Chapelain, E Chapon, G Chen, YC Chen, M Chertok, G Chiarelli, G Chlachidze, K Cho, SW Cho, S Choi, D Chokheli, B Choudhary, S Cihangir, D Claes, A Clark, C Clarke, J Clutter, ME Convery, J Conway, M Cooke, WE Cooper, M Corbo, M Corcoran, M Cordelli, F Couderc, M-C Cousinou, CA Cox, DJ Cox, M Cremonesi, D Cruz, J Cuevas, R Culbertson, J Cuth, D Cutts, A Das, N d’Ascenzo, M Datta, G Davies, P de Barbaro, SJ de Jong, E De La Cruz-Burelo, F Déliot, R Demina, L Demortier, M Deninno, D Denisov, SP Denisov, M D’Errico, S Desai, C Deterre, K DeVaughan, F Devoto, A Di Canto, B Di Ruzza, HT Diehl, M Diesburg, PF Ding, JR Dittmann, A Dominguez, S Donati, M D’Onofrio, M Dorigo, A Driutti, A Drutskoy, A Dubey, LV Dudko, A Duperrin, S Dutt, M Eads, K Ebina, R Edgar, D Edmunds, A Elagin, J Ellison, VD Elvira, Y Enari, R Erbacher, S Errede, B Esham, H Evans, A Evdokimov, VN Evdokimov, S Farrington, A Fauré, L Feng, T Ferbel, JP Fernández Ramos, F Fiedler, R Field, F Filthaut, W Fisher, HE Fisk, G Flanagan, R Forrest, M Fortner, H Fox, J Franc, M Franklin, JC Freeman, H Frisch, S Fuess, Y Funakoshi, C Galloni, PH Garbincius, A Garcia-Bellido, JA García-González, AF Garfinkel, P Garosi, V Gavrilov, W Geng, CE Gerber, H Gerberich, E Gerchtein, Y Gershtein, S Giagu, V Giakoumopoulou, K Gibson, CM Ginsburg, G Ginther, N Giokaris, P Giromini, V Glagolev, D Glenzinski, O Gogota, M Gold, D Goldin, A Golossanov, G Golovanov, G Gomez, G Gomez-Ceballos, M Goncharov, O González López, I Gorelov, AT Goshaw, K Goulianos, E Gramellini, PD Grannis, S Greder, H Greenlee, G Grenier, Ph Gris, J-F Grivaz, A Grohsjean, C Grosso-Pilcher, S Grünendahl, MW Grünewald, T Guillemin, J Guimaraes da Costa, G Gutierrez, P Gutierrez, SR Hahn, J Haley, JY Han, L Han, F Happacher, K Hara, K Harder, M Hare, A Harel, RF Harr, T Harrington-Taber, K Hatakeyama, JM Hauptman, C Hays, J Hays, T Head, T Hebbeker, D Hedin, H Hegab, J Heinrich, AP Heinson, U Heintz, C Hensel, I Heredia-De La Cruz, M Herndon, K Herner, G Hesketh, MD Hildreth, R Hirosky, T Hoang, JD Hobbs, A Hocker, B Hoeneisen, J Hogan, M Hohlfeld, JL Holzbauer, Z Hong, W Hopkins, S Hou, I Howley, Z Hubacek, RE Hughes, U Husemann, M Hussein, J Huston, V Hynek, I Iashvili, Y Ilchenko, R Illingworth, G Introzzi, M Iori, AS Ito, A Ivanov, S Jabeen, M Jaffré, E James, D Jang, A Jayasinghe, B Jayatilaka, EJ Jeon, MS Jeong, R Jesik, P Jiang, S Jindariani, K Johns, E Johnson, M Johnson, A Jonckheere, M Jones, P Jonsson, KK Joo, J Joshi, SY Jun, AW Jung, TR Junk, A Juste, E Kajfasz, M Kambeitz, T Kamon, PE Karchin, D Karmanov, A Kasmi, Y Kato, I Katsanos, M Kaur, R Kehoe, S Kermiche, W Ketchum, J Keung, N Khalatyan, A Khanov, A Kharchilava, YN Kharzheev, B Kilminster, DH Kim, HS Kim, JE Kim, MJ Kim, SH Kim, SB Kim, YJ Kim, YK Kim, N Kimura, M Kirby, I Kiselevich, JM Kohli, K Kondo, DJ Kong, J Konigsberg, AV Kotwal, AV Kozelov, J Kraus, M Kreps, J Kroll, M Kruse, T Kuhr, A Kumar, A Kupco, M Kurata, T Kurča, VA Kuzmin, AT Laasanen, S Lammel, S Lammers, M Lancaster, K Lannon, G Latino, P Lebrun, HS Lee, HS Lee, JS Lee, SW Lee, WM Lee, X Lei, J Lellouch, S Leo, S Leone, JD Lewis, D Li, H Li, L Li, QZ Li, JK Lim, A Limosani, D Lincoln, J Linnemann, VV Lipaev, E Lipeles, R Lipton, A Lister, H Liu, Q Liu, T Liu, Y Liu, A Lobodenko, S Lockwitz, A Loginov, M Lokajicek, R Lopes de, D Lucchesi, A Lucà, J Lueck, P Lujan, P Lukens, R Luna-Garcia, G Lungu, AL Lyon, J Lys, R Lysak, AKA Maciel, R Madar, R Madrak, P Maestro, R Magaña-Villalba, S Malik, S Malik, VL Malyshev, G Manca, A Manousakis-Katsikakis, J Mansour, L Marchese, F Margaroli, P Marino, J Martínez-Ortega, K Matera, ME Mattson, A Mazzacane, P Mazzanti, R McCarthy, CL McGivern, R McNulty, A Mehta, P Mehtala, MM Meijer, A Melnitchouk, D Menezes, PG Mercadante, M Merkin, C Mesropian, A Meyer, J Meyer, T Miao, F Miconi, D Mietlicki, A Mitra, H Miyake, S Moed, N Moggi, NK Mondal, CS Moon, R Moore, MJ Morello, A Mukherjee, M Mulhearn, Th Muller, P Murat, M Mussini, J Nachtman, Y Nagai, J Naganoma, E Nagy, I Nakano, A Napier, M Narain, R Nayyar, HA Neal, JP Negret, J Nett, P Neustroev, HT Nguyen, T Nigmanov, L Nodulman, SY Noh, O Norniella, T Nunnemann, L Oakes, SH Oh, YD Oh, T Okusawa, R Orava, J Orduna, L Ortolan, N Osman, C Pagliarone, A Pal, E Palencia, P Palni, V Papadimitriou, N Parashar, V Parihar, SK Park, W Parker, R Partridge, N Parua, A Patwa, G Pauletta, M Paulini, C Paus, B Penning, M Perfilov, Y Peters, K Petridis, G Petrillo, P Pétroff, TJ Phillips, G Piacentino, E Pianori, J Pilot, K Pitts, C Plager, M-A Pleier, VM Podstavkov, L Pondrom, AV Popov, S Poprocki, K Potamianos, A Pranko, M Prewitt, D Price, N Prokopenko, F Prokoshin, F Ptohos, G Punzi, J Qian, A Quadt, B Quinn, PN Ratoff, I Razumov, I Redondo Fernández, P Renton, M Rescigno, F Rimondi, I Ripp-Baudot, L Ristori, F Rizatdinova, A Robson, T Rodriguez, S Rolli, M Rominsky, M Ronzani, R Roser, JL Rosner, A Ross, C Royon, P Rubinov, R Ruchti, F Ruffini, A Ruiz, J Russ, V Rusu, G Sajot, WK Sakumoto, Y Sakurai, A Sánchez-Hernández, MP Sanders, L Santi, AS Santos, K Sato, G Savage, V Saveliev, M Savitskyi, A Savoy-Navarro, L Sawyer, T Scanlon, RD Schamberger, Y Scheglov, H Schellman, P Schlabach, EE Schmidt, M Schott, C Schwanenberger, T Schwarz, R Schwienhorst, L Scodellaro, F Scuri, S Seidel, Y Seiya, J Sekaric, A Semenov, H Severini, F Sforza, E Shabalina, SZ Shalhout, V Shary, S Shaw, AA Shchukin, T Shears, PF Shepard, M Shimojima, O Shkola, M Shochet, I Shreyber-Tecker, V Simak, A Simonenko, P Skubic, P Slattery, K Sliwa, JR Smith, FD Snider, GR Snow, J Snow, S Snyder, S Söldner-Rembold, H Song, L Sonnenschein, V Sorin, K Soustruznik, R St. Denis, M Stancari, J Stark, N Stefaniuk, D Stentz, DA Stoyanova, M Strauss, J Strologas, Y Sudo, A Sukhanov, I Suslov, L Suter, P Svoisky, K Takemasa, Y Takeuchi, J Tang, M Tecchio, PK Teng, J Thom, E Thomson, V Thukral, M Titov, D Toback, S Tokar, VV Tokmenin, K Tollefson, T Tomura, D Tonelli, S Torre, D Torretta, P Totaro, M Trovato, Y-T Tsai, D Tsybychev, B Tuchming, C Tully, F Ukegawa, S Uozumi, L Uvarov, S Uvarov, S Uzunyan, R Van Kooten, WM van Leeuwen, N Varelas, EW Varnes, IA Vasilyev, F Vázquez, G Velev, C Vellidis, AY Verkheev, C Vernieri, LS Vertogradov, M Verzocchi, M Vesterinen, M Vidal, D Vilanova, R Vilar, J Vizán, M Vogel, P Vokac, G Volpi, P Wagner, HD Wahl, R Wallny, MHLS Wang, SM Wang, J Warchol, D Waters, G Watts, M Wayne, J Weichert, L Welty-Rieger, WC Wester, D Whiteson, AB Wicklund, S Wilbur, HH Williams, MRJ Williams, GW Wilson, JS Wilson, P Wilson, BL Winer, P Wittich, M Wobisch, S Wolbers, H Wolfmeister, DR Wood, T Wright, X Wu, Z Wu, TR Wyatt, Y Xie, R Yamada, K Yamamoto, D Yamato, S Yang, T Yang, UK Yang, YC Yang, W-M Yao, T Yasuda, YA Yatsunenko, W Ye, Z Ye, GP Yeh, K Yi, H Yin, K Yip, J Yoh, K Yorita, T Yoshida, SW Youn, GB Yu, I Yu, JM Yu, AM Zanetti, Y Zeng, J Zennamo, TG Zhao, B Zhou, C Zhou, J Zhu, M Zielinski, D Zieminska, L Zivkovic, S Zucchelli

Search for light resonances decaying to boosted quark pairs and produced in association with a photon or a jet in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ArXiv 1801.08769 (2018)

Search for dark matter and other new phenomena in events with an energetic jet and large missing transverse momentum using the ATLAS detector

Journal of High Energy Physics Springer Verlag 2018 (2018) 126

Authors:

M Aaboud, G Aad, B Abbott, Giacomo Artoni, Alan Barr, Kathrin Becker, Lydia Beresford, Daniela Bortoletto, Amanda Cooper-Sarkar, JA Frost, Elizabeth Gallas, Claire Gwenlan, F Giuli, Christopher Hays, Todd Huffman, Cigdem Issever, Jesse Liu, Luigi Marchese, Koichi Nagai, ME Nelson, Richard Nickerson, Ian Shipsey, Georg Viehhauser, Jeffrey Tseng, Anthony Weidberg, Gabija Zemaityte

Abstract:

Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The search uses proton-proton collision data corresponding to an integrated luminosity of 36.1 fb−1 at a centre-of-mass energy of 13 TeV collected in 2015 and 2016 with the ATLAS detector at the Large Hadron Collider. Events are required to have at least one jet with a transverse momentum above 250 GeV and no leptons (e or μ). Several signal regions are considered with increasing requirements on the missing transverse momentum above 250 GeV. Good agreement is observed between the number of events in data and Standard Model predictions. The results are translated into exclusion limits in models with pair-produced weakly interacting dark-matter candidates, large extra spatial dimensions, and supersymmetric particles in several compressed scenarios.