Professor Brian Foster OBE, FRS: Publications

Impact of jet-production data on the next-to-next-to-leading-order determination of HERAPDF2.0 parton distributions

European Physical Journal C: Particles and Fields Springer Nature 82:3 (2022) 243

Authors:

I Abt, R Aggarwal, V Andreev, Amanda Cooper-Sarkar, Brian Foster, Claire Gwenlan, Voica Radescu

Abstract:

The HERAPDF2.0 ensemble of parton distribution functions (PDFs) was introduced in 2015. The final stage is presented, a next-to-next-to-leading-order (NNLO) analysis of the HERA data on inclusive deep inelastic ep scattering together with jet data as published by the H1 and ZEUS collaborations. A perturbative QCD fit, simultaneously of αs(M2Z) and the PDFs, was performed with the result αs(M2Z)=0.1156±0.0011 (exp) +0.0001−0.0002 (model +parameterisation) ±0.0029 (scale). The PDF sets of HERAPDF2.0Jets NNLO were determined with separate fits using two fixed values of αs(M2Z), αs(M2Z)=0.1155 and 0.118, since the latter value was already chosen for the published HERAPDF2.0 NNLO analysis based on HERA inclusive DIS data only. The different sets of PDFs are presented, evaluated and compared. The consistency of the PDFs determined with and without the jet data demonstrates the consistency of HERA inclusive and jet-production cross-section data. The inclusion of the jet data reduced the uncertainty on the gluon PDF. Predictions based on the PDFs of HERAPDF2.0Jets NNLO give an excellent description of the jet-production data used as input.

Recovery time of a plasma-wakefield accelerator

Nature Springer Nature 603:7899 (2022) 58-62

Authors:

R D’Arcy, James Chappell, J Beinortaite, S Diederichs, G Boyle, B Foster, Mj Garland, P Gonzalez Caminal, Ca Lindstrøm, G Loisch, S Schreiber, S Schröder, Rj Shalloo, M Thévenet, S Wesch, M Wing, J Osterhoff

Abstract:

The interaction of intense particle bunches with plasma can give rise to plasma wakes capable of sustaining gigavolt-per-metre electric fields, which are orders of magnitude higher than provided by state-of-the-art radio-frequency technology. Plasma wakefields can, therefore, strongly accelerate charged particles and offer the opportunity to reach higher particle energies with smaller and hence more widely available accelerator facilities. However, the luminosity and brilliance demands of high-energy physics and photon science require particle bunches to be accelerated at repetition rates of thousands or even millions per second, which are orders of magnitude higher than demonstrated with plasma-wakefield technology. Here we investigate the upper limit on repetition rates of beam-driven plasma accelerators by measuring the time it takes for the plasma to recover to its initial state after perturbation by a wakefield. The many-nanosecond-level recovery time measured establishes the in-principle attainability of megahertz rates of acceleration in plasmas. The experimental signatures of the perturbation are well described by simulations of a temporally evolving parabolic ion channel, transferring energy from the collapsing wake to the surrounding media. This result establishes that plasma-wakefield modules could be developed as feasible high-repetition-rate energy boosters at current and future particle-physics and photon-science facilities.

Azimuthal correlations in photoproduction and deep inelastic ep scattering at HERA

JOURNAL OF HIGH ENERGY PHYSICS (2021) ARTN 102

Authors:

I Abt, R Aggarwal, V Aushev, O Behnke, A Bertolin, I Bloch, I Brock, NH Brook, R Brugnera, A Bruni, PJ Bussey, A Caldwell, CD Catterall, J Chwastowski, J Ciborowski, R Ciesielski, AM Cooper-Sarkar, M Corradi, RK Dementiev, S Dusini, J Ferrando, S Floerchinger, B Foster, E Gallo, D Gangadharan, A Garfagnini, A Geiser, LK Gladilin, Yu A Golubkov, G Grzelak, C Gwenlan, D Hochman, NZ Jomhari, I Kadenko, U Karshon, P Kaur, R Klanner, U Klein, IA Korzhavina, N Kovalchuk, M Kuze, BB Levchenko, A Levy, B Loehr, E Lohrmann, A Longhin, F Lorkowski, O Yu Lukina, I Makarenko, J Malka, S Masciocchi, K Nagano, JD Nam, J Onderwaater, Yu Onishchuk, E Paul, I Pidhurskyi, A Polini, M Przybycien, A Quintero, M Ruspa, U Schneekloth, T Schoerner-Sadenius, I Selyuzhenkov, M Shchedrolosiev, LM Shcheglova, IO Skillicorn, W Slominski, A Solano, L Stanco, N Stefaniuk, B Surrow, K Tokushuku, O Turkot, T Tymieniecka, A Verbytskyi, WAT Wan Abdullah, K Wichmann, M Wing, S Yamada, Y Yamazaki, AF Zarnecki, O Zenaiev, ZEUS Collaboration

Brexit and scientific research?

European Journal of English Studies Taylor & Francis 25:1 (2021) 11-18

Review of Particle Physics

Oxford University Press (OUP) 2020:8 (2020)

Authors:

PA Zyla, RM Barnett, J Beringer, O Dahl, DA Dwyer, DE Groom, C-J Lin, KS Lugovsky, E Pianori, DJ Robinson, CG Wohl, W-M Yao, K Agashe, G Aielli, BC Allanach, C Amsler, M Antonelli, EC Aschenauer, DM Asner, H Baer, Sw Banerjee, L Baudis, CW Bauer, JJ Beatty, VI Belousov, S Bethke, A Bettini, O Biebel, KM Black, E Blucher, O Buchmuller, V Burkert, MA Bychkov, RN Cahn, M Carena, A Ceccucci, A Cerri, D Chakraborty, R Sekhar Chivukula, G Cowan, G D'Ambrosio, T Damour, D de Florian, A de Gouvêa, T DeGrand, P de Jong, G Dissertori, BA Dobrescu, M D'Onofrio, M Doser, M Drees, HK Dreiner, P Eerola, U Egede, S Eidelman, J Ellis, J Erler, VV Ezhela, W Fetscher, BD Fields, B Foster, A Freitas, H Gallagher, L Garren, H-J Gerber, G Gerbier, T Gershon, Y Gershtein, T Gherghetta, AA Godizov, MC Gonzalez-Garcia, M Goodman, C Grab, AV Gritsan, C Grojean, M Grünewald, A Gurtu, T Gutsche, HE Haber, C Hanhart, S Hashimoto, Y Hayato, A Hebecker, S Heinemeyer, B Heltsley, JJ Hernández-Rey, K Hikasa, J Hisano, A Höcker, J Holder, A Holtkamp, J Huston, T Hyodo, KF Johnson, M Kado, M Karliner, UF Katz, M Kenzie, VA Khoze, SR Klein, E Klempt, RV Kowalewski, F Krauss, M Kreps, B Krusche, Y Kwon, O Lahav, J Laiho, LP Lellouch, J Lesgourgues, AR Liddle, Z Ligeti, C Lippmann, TM Liss, L Littenberg, C Lourengo, SB Lugovsky, A Lusiani, Y Makida, F Maltoni, T Mannel, AV Manohar, WJ Marciano, A Masoni, J Matthews, U-G Meißner, M Mikhasenko, DJ Miller, D Milstead, RE Mitchell, K Mönig, P Molaro, F Moortgat, M Moskovic, K Nakamura, M Narain, P Nason, S Navas, M Neubert, P Nevski, Y Nir, KA Olive, C Patrignani, JA Peacock, ST Petcov, VA Petrov, A Pich, A Piepke, A Pomarol, S Profumo, A Quadt, K Rabbertz, J Rademacker, G Raffelt, H Ramani, M Ramsey-Musolf, BN Ratcliff, P Richardson, A Ringwald, S Roesler, S Rolli, A Romaniouk, LJ Rosenberg, JL Rosner, G Rybka, M Ryskin, RA Ryutin, Y Sakai, GP Salam, S Sarkar, F Sauli, O Schneider, K Scholberg, AJ Schwartz, J Schwiening, D Scott, V Sharma, SR Sharpe, T Shutt, M Silari, T Sjöstrand, P Skands, T Skwarnicki, GF Smoot, A Soffer, MS Sozzi, S Spanier, C Spiering, A Stahl, SL Stone, Y Sumino, T Sumiyoshi, MJ Syphers, F Takahashi, M Tanabashi, J Tanaka, M Taševský, K Terashi, J Terning, U Thoma, RS Thorne, L Tiator, M Titov, NP Tkachenko, DR Tovey, K Trabelsi, P Urquijo, G Valencia, R Van de Water, N Varelas, G Venanzoni, L Verde, MG Vincter, P Vogel, W Vogelsang, A Vogt, V Vorobyev, SP Wakely, W Walkowiak, CW Walter, D Wands, MO Wascko, DH Weinberg, EJ Weinberg, M White, LR Wiencke, S Willocq, CL Woody, RL Workman, M Yokoyama, R Yoshida, G Zanderighi, GP Zeller, OV Zenin, R-Y Zhu, S-L Zhu, F Zimmermann, J Anderson, T Basaglia, VS Lugovsky, P Schaffner, W Zheng

Abstract:

Abstract The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 3,324 new measurements from 878 papers, we list, evaluate, and average measured properties of gauge bosons and the recently discovered Higgs boson, leptons, quarks, mesons, and baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle properties and search limits are listed in Summary Tables. We give numerous tables, figures, formulae, and reviews of topics such as Higgs Boson Physics, Supersymmetry, Grand Unified Theories, Neutrino Mixing, Dark Energy, Dark Matter, Cosmology, Particle Detectors, Colliders, Probability and Statistics. Among the 120 reviews are many that are new or heavily revised, including a new review on High Energy Soft QCD and Diffraction and one on the Determination of CKM Angles from B Hadrons. The Review is divided into two volumes. Volume 1 includes the Summary Tables and 98 review articles. Volume 2 consists of the Particle Listings and contains also 22 reviews that address specific aspects of the data presented in the Listings. The complete Review (both volumes) is published online on the website of the Particle Data Group (pdg.lbl.gov) and in a journal. Volume 1 is available in print as the PDG Book. A Particle Physics Booklet with the Summary Tables and essential tables, figures, and equations from selected review articles is available in print and as a web version optimized for use on phones as well as an Android app.

51��