ATLAS

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Combined QCD and electroweak analysis of HERA data

(2016)

Authors:

ZEUS Collaboration, H Abramowicz, I Abt, L Adamczyk, M Adamus, S Antonelli, V Aushev, O Behnke, U Behrens, A Bertolin, S Bhadra, I Bloch, EG Boos, I Brock, NH Brook, R Brugnera, A Bruni, PJ Bussey, A Caldwell, M Capua, CD Catterall, J Chwastowski, J Ciborowski, R Ciesielski, AM Cooper-Sarkar, M Corradi, RK Dementiev, RCE Devenish, S Dusini, B Foster, G Gach, E Gallo, A Garfagnini, A Geiser, A Gizhko, LK Gladilin, Yu A Golubkov, G Grzelak, M Guzik, C Gwenlan, W Hain, O Hlushchenko, D Hochman, R Hori, ZA Ibrahim, Y Iga, M Ishitsuka, F Januschek, NZ Jomhari, I Kadenko, S Kananov, U Karshon, P Kaur, D Kisielewska, R Klanner, U Klein, IA Korzhavina, A Kotanski, U Koetz, N Kovalchuk, H Kowalski, B Krupa, O Kuprash, M Kuze, BB Levchenko, A Levy, S Limentani, M Lisovyi, E Lobodzinska, B Loehr, E Lohrmann, A Longhin, D Lontkovskyi, O Yu Lukina, I Makarenko, J Malka, A Mastroberardino, F Mohamad Idris, N Mohammad Nasir, V Myronenko, K Nagano, T Nobe, RJ Nowak, Yu Onishchuk, E Paul, W Perlanski, NS Pokrovskiy, A Polini, M Przybycien, P Roloff, M Ruspa, DH Saxon, M Schioppa, U Schneekloth, T Schoerner-Sadenius, LM Shcheglova, R Shevchenko, O Shkola, Yu Shyrma, I Singh, IO Skillicorn, W Slominski, A Solano, L Stanco, N Stefaniuk, A Stern, P Stopa, J Sztuk-Dambietz, E Tassi, K Tokushuku, J Tomaszewska, T Tsurugai, M Turcato, O Turkot, T Tymieniecka, A Verbytskyi, WAT Wan Abdullah, K Wichmann, M Wing, S Yamada, Y Yamazaki, N Zakharchuk, AF Zarnecki, L Zawiejski, O Zenaiev, BO Zhautykov, DS Zotkin
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Search for dark matter particles in proton-proton collisions at sqrt(s) = 8 TeV using the razor variables

ArXiv 1603.08914 (2016)
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Measurements of t t-bar charge asymmetry using dilepton final states in pp collisions at sqrt(s) = 8 TeV

ArXiv 1603.06221 (2016)
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Identification of boosted, hadronically decaying W bosons and comparisons with ATLAS data taken at √s = 8 TeV

European Physical Journal C Springer Berlin Heidelberg 76:3 (2016)

Authors:

G Aad, B Abbott, J Abdallah, O Abdinov, R Aben, M Abolins, OS AbouZeid, H Abramowicz, H Abreu, R Abreu, Y Abulaiti, BS Acharya, L Adamczyk, DL Adams, J Adelman, S Adomeit, T Adye, AA Affolder, T Agatonovic-Jovin, J Agricola, JA Aguilar-Saavedra, SP Ahlen, F Ahmadov, G Aielli, H Akerstedt, TPA Åkesson, AV Akimov, GL Alberghi, J Albert, S Albrand, MJ Alconada Verzini, M Aleksa, IN Aleksandrov, C Alexa, G Alexander, T Alexopoulos, M Alhroob, G Alimonti, L Alio, J Alison, SP Alkire, BMM Allbrooke, PP Allport, A Aloisio, A Alonso, F Alonso, C Alpigiani, Cigdem Issever

Abstract:

This paper reports a detailed study of techniques for identifying boosted, hadronically decaying W bosons using 20.3 fb (Formula presented.) of proton–proton collision data collected by the ATLAS detector at the LHC at a centre-of-mass energy (Formula presented.). A range of techniques for optimising the signal jet mass resolution are combined with various jet substructure variables. The results of these studies in Monte Carlo simulations show that a simple pairwise combination of groomed jet mass and one substructure variable can provide a 50 % efficiency for identifying W bosons with transverse momenta larger than 200 GeV while maintaining multijet background efficiencies of 2–4 % for jets with the same transverse momentum. These signal and background efficiencies are confirmed in data for a selection of tagging techniques.
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Search for new phenomena in dijet mass and angular distributions from pp collisions at root s=13 TeV with the ATLAS detector

Physics Letters B Elsevier 754 (2016) 302-322

Authors:

G Artoni, AJ Barr, K Becker, JK Behr, L Beresford, D Bortoletto, AM Cooper-Sarkar, M Crispin Ortuzar, JA Frost, EJ Gallas, S Gupta, C Gwenlan, D Hall, CP Hays, J Henderson, J Howard, TB Huffman, C Issever, CW Kalderon, LA Kogan, K Nagai, RB Nickerson, MA Pickering, NC Ryder, JCL Tseng, GHA Viehhauser, AR Weidberg, Z J, M Crispin Ortuzar

Abstract:

This Letter describes a model-agnostic search for pairs of jets (dijets) produced by resonant and non-resonant phenomena beyond the Standard Model in 3.6 fb-1 of proton-proton collisions with a centre-of-mass energy of s=13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The distribution of the invariant mass of the two leading jets is examined for local excesses above a data-derived estimate of the smoothly falling prediction of the Standard Model. The data are also compared to a Monte Carlo simulation of Standard Model angular distributions derived from the rapidity of the two jets. No evidence of anomalous phenomena is observed in the data, which are used to exclude, at 95% CL, quantum black holes with threshold masses below 8.3 TeV, 8.1 TeV, or 5.1 TeV in three different benchmark scenarios; resonance masses below 5.2 TeV for excited quarks, 2.6 TeV in a W' model, a range of masses starting from mZ'=1.5 TeV and couplings from gq=0.2 in a Z' model; and contact interactions with a compositeness scale below 12.0 TeV and 17.5 TeV respectively for destructive and constructive interference between the new interaction and QCD processes. These results significantly extend the ATLAS limits obtained from 8 TeV data. Gaussian-shaped contributions to the mass distribution are also excluded if the effective cross-section exceeds values ranging from approximately 50-300 fb for masses below 2 TeV to 2-20 fb for masses above 4 TeV.
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