An experiment for electron-hadron scattering at the LHC

The European Physical Journal C Springer Science and Business Media LLC 82:1 (2022) 40

Authors:

KDJ André, L Aperio Bella, N Armesto, SA Bogacz, D Britzger, OS Brüning, M D’Onofrio, EG Ferreiro, O Fischer, C Gwenlan, BJ Holzer, M Klein, U Klein, F Kocak, P Kostka, M Kumar, B Mellado, JG Milhano, PR Newman, K Piotrzkowski, A Polini, X Ruan, S Russenschuk, C Schwanenberger, E Vilella-Figueras, Y Yamazaki

Abstract:

AbstractNovel considerations are presented on the physics, apparatus and accelerator designs for a future, luminous, energy frontier electron-hadron (eh) scattering experiment at the LHC in the thirties for which key physics topics and their relation to the hadron-hadron HL-LHC physics programme are discussed. Demands are derived set by these physics topics on the design of the LHeC detector, a corresponding update of which is described. Optimisations on the accelerator design, especially the interaction region (IR), are presented. Initial accelerator considerations indicate that a common IR is possible to be built which alternately could serve eh and hh collisions while other experiments would stay on hh in either condition. A forward-backward symmetrised option of the LHeC detector is sketched which would permit extending the LHeC physics programme to also include aspects of hadron-hadron physics. The vision of a joint eh and hh physics experiment is shown to open new prospects for solving fundamental problems of high energy heavy-ion physics including the partonic structure of nuclei and the emergence of hydrodynamics in quantum field theory while the genuine TeV scale DIS physics is of unprecedented rank.

Operation and performance of the ATLAS semiconductor tracker in LHC Run 2

Journal of Instrumentation IOP Publishing 17:01 (2022) P01013-P01013

Authors:

Georges Aad, Brad Abbott, Dale Charles Abbott, Adam Abed Abud, Kira Abeling, Deshan Kavishka Abhayasinghe, Syed Haider Abidi, Asmaa Aboulhorma, Halina Abramowicz, Henso Abreu, Yiming Abulaiti, Angel Christian Abusleme Hoffman, Bobby Samir Acharya, Baida Achkar, Lennart Adam, Claire Adam Bourdarios, Sagar Vidya Addepalli, Melike Akbiyik, Torsten Paul Ake Åkesson, Andrei Akimov, Konie Al Khoury, Martin Aleksa, Igor Aleksandrov, Calin Alexa

Abstract:

<jats:title>Abstract</jats:title> <jats:p>The semiconductor tracker (SCT) is one of the tracking systems for charged particles in the ATLAS detector. It consists of 4088 silicon strip sensor modules. During Run 2 (2015–2018) the Large Hadron Collider delivered an integrated luminosity of 156 fb<jats:sup>-1</jats:sup> to the ATLAS experiment at a centre-of-mass proton-proton collision energy of 13 TeV. The instantaneous luminosity and pile-up conditions were far in excess of those assumed in the original design of the SCT detector. Due to improvements to the data acquisition system, the SCT operated stably throughout Run 2. It was available for 99.9% of the integrated luminosity and achieved a data-quality efficiency of 99.85%. Detailed studies have been made of the leakage current in SCT modules and the evolution of the full depletion voltage, which are used to study the impact of radiation damage to the modules.</jats:p>

Operation and performance of the ATLAS semiconductor tracker in LHC Run 2

Journal of Instrumentation IOP Publishing 17:01 (2022) P01013-P01013

Authors:

Georges Aad, Brad Abbott, Dale Charles Abbott, Adam Abed Abud, Kira Abeling, Deshan Kavishka Abhayasinghe, Syed Haider Abidi, Asmaa Aboulhorma, Halina Abramowicz, Henso Abreu, Yiming Abulaiti, Angel Christian Abusleme Hoffman, Bobby Samir Acharya, Baida Achkar, Lennart Adam, Claire Adam Bourdarios, Sagar Vidya Addepalli, Melike Akbiyik, Torsten Paul Ake Åkesson, Andrei Akimov, Konie Al Khoury, Martin Aleksa, Igor Aleksandrov, Calin Alexa

Abstract:

<jats:title>Abstract</jats:title> <jats:p>The semiconductor tracker (SCT) is one of the tracking systems for charged particles in the ATLAS detector. It consists of 4088 silicon strip sensor modules. During Run 2 (2015–2018) the Large Hadron Collider delivered an integrated luminosity of 156 fb<jats:sup>-1</jats:sup> to the ATLAS experiment at a centre-of-mass proton-proton collision energy of 13 TeV. The instantaneous luminosity and pile-up conditions were far in excess of those assumed in the original design of the SCT detector. Due to improvements to the data acquisition system, the SCT operated stably throughout Run 2. It was available for 99.9% of the integrated luminosity and achieved a data-quality efficiency of 99.85%. Detailed studies have been made of the leakage current in SCT modules and the evolution of the full depletion voltage, which are used to study the impact of radiation damage to the modules.</jats:p>

Transport away your problems: Calibrating stochastic simulations with optimal transport

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Elsevier (2021)

Authors:

Christopher Pollard, Philipp Windischhofer

Abstract:

Stochastic simulators are an indispensable tool in many branches of science. Often based on first principles, they deliver a series of samples whose distribution implicitly defines a probability measure to describe the phenomena of interest. However, the fidelity of these simulators is not always sufficient for all scientific purposes, necessitating the construction of ad-hoc corrections to “calibrate” the simulation and ensure that its output is a faithful representation of reality. In this paper, we leverage methods from transportation theory to construct such corrections in a systematic way. We use a neural network to compute minimal modifications to the individual samples produced by the simulator such that the resulting distribution becomes properly calibrated. We illustrate the method and its benefits in the context of experimental particle physics, where the need for calibrated stochastic simulators is particularly pronounced.

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