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Measurement of the cross-section ratio sigma_{psi(2S)}/sigma_{J/psi(1S)} in deep inelastic exclusive ep scattering at HERA

(2016)

Authors:

ZEUS Collaboration, H Abramowicz, I Abt, L Adamczyk, M Adamus, S Antonelli, V Aushev, Y Aushev, O Behnke, U Behrens, A Bertolin, I Bloch, EG Boos, K Borras, 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, F Corriveau, RK Dementiev, RCE Devenish, G Dolinska, S Dusini, J Figiel, B Foster, G Gach, E Gallo, A Garfagnini, A Geiser, A Gizhko, LK Gladilin, Yu A Golubkov, J Grebenyuk, I Gregor, G Grzelak, O Gueta, M Guzik, W Hain, D Hochman, R Hori, ZA Ibrahim, Y Iga, M Ishitsuka, A Iudin, F Januschek, NZ Jomhari, I Kadenko, S Kananov, U Karshon, M Kaur, P Kaur, D Kisielewska, R Klanner, U Klein, N Kondrashova, O Kononenko, Ie Korol, IA Korzhavina, A Kotański, U Kötz, N Kovalchuk, H Kowalski, B Krupa, O Kuprash, M Kuze, BB Levchenko, A Levy, V Libov, S Limentani, M Lisovyi, E Lobodzinska, B Löhr, E Lohrmann, A Longhin, D Lontkovskyi, O Yu Lukina, I Makarenko, J Malka, S Mergelmeyer, F Mohamad Idris, N Mohammad Nasir, V Myronenko, K Nagano, T Nobe, D Notz, RJ Nowak, Yu Onishchuk, E Paul, W Perlański, NS Pokrovskiy, M Przybycień, P Roloff, I Rubinsky, M Ruspa, DH Saxon, M Schioppa, WB Schmidke, U Schneekloth, T Schörner-Sadenius, LM Shcheglova, R Shevchenko, O Shkola, Yu Shyrma, I Singh, IO Skillicorn, W Słomiński, A Solano, L Stanco, N Stefaniuk, A Stern, P Stopa, J Sztuk-Dambietz, D Szuba, J Szuba, E Tassi, K Tokushuku, J Tomaszewska, A Trofymov, T Tsurugai, M Turcato, O Turkot, T Tymieniecka, A Verbytskyi, O Viazlo, R Walczak, WAT Wan Abdullah, K Wichmann, M Wing, G Wolf, S Yamada, Y Yamazaki, N Zakharchuk, AF Żarnecki, L Zawiejski, O Zenaiev, BO Zhautykov, N Zhmak, DS Zotkin
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Production of exclusive dijets in diffractive deep inelastic scattering at HERA

European Physical Journal C Springer Berlin Heidelberg 76:1 (2016) 1-18

Authors:

H Abramowicz, I Abt, L Adamczyk, M Adamus, S Antonelli, V Aushev, Y Aushev, O Behnke, U Behrens, A Bertolin, I Bloch, EG Boos, K Borras, 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

Abstract:

Production of exclusive dijets in diffractive deep inelastic e±p scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 372 pb-1. The measurement was performed for γ∗–p centre-of-mass energies in the range 9025GeV2. Energy flows around the jet axis are presented. The cross section is presented as a function of β and ϕ, where β=x/xIP, x is the Bjorken variable and xIP is the proton fractional longitudinal momentum loss. The angle ϕ is defined by the γ∗–dijet plane and the γ∗–e± plane in the rest frame of the diffractive final state. The ϕ cross section is measured in bins of β. The results are compared to predictions from models based on different assumptions about the nature of the diffractive exchange.
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Measurement of inclusive jet production and nuclear modifications in pPb collisions at sqrt(s[NN]) = 5.02 TeV

ArXiv 1601.02001 (2016)
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Measurements of t t-bar spin correlations and top quark polarization using dilepton final states in pp collisions at sqrt(s) = 8 TeV

ArXiv 1601.01107 (2016)
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PDF4LHC recommendations for LHC Run II

Journal of Physics G: Nuclear and Particle Physics IOP Publishing 43:2 (2016)

Authors:

J Butterworth, S Carrazza, Amanda Cooper-Sarkar, AD Roeck, J Feltesse, S Forte, J Gao, S Glazov, J Huston, Z Kassabov, R McNulty, A Morsch, P Nadolsky, V Radescu, Juan Rojo, R Thorne

Abstract:

We provide an updated recommendation for the usage of sets of parton distribution functions (PDFs) and the assessment of PDF and PDF + αs uncertainties suitable for applications at the LHC Run II. We review devel-opments since the previous PDF4LHC recommendation, and discuss and compare the new generation of PDFs, which include substantial information from experimental data from the Run I of the LHC. We then propose a new prescription for the combination of a suitable subset of the available PDF sets, which is presented in terms of a single combined PDF set. We finally discuss tools which allow for the delivery of this combined set in terms of optimized sets of Hessian eigenvectors or Monte Carlo replicas, and their usage, and provide some examples of their application to LHC phenomenology. This paper is dedicated to the memory of Guido Altarelli (1941-2015), whose seminal work made possible the quantitative study of PDFs.
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