When crises collide—Policing a pandemic during social unrest by Marie C. Jipguep-Akhtar, Tia Dickerson, Denae Bradley

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Purely Virtual Particles in Quantum Gravity, Inflationary Cosmology and Collider Physics by Damiano Anselmi

“…We review the concept of purely virtual particle and its uses in quantum gravity, primordial cosmology and collider physics. The fake particle, or “fakeon”, which mediates interactions without appearing among the incoming and outgoing states, can be introduced by means of a new diagrammatics. …”
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Simulations and measurements of beam loss patterns at the CERN Large Hadron Collider by R. Bruce, R. W. Assmann, V. Boccone, C. Bracco, M. Brugger, M. Cauchi, F. Cerutti, D. Deboy, A. Ferrari, L. Lari, A. Marsili, A. Mereghetti, D. Mirarchi, E. Quaranta, S. Redaelli, G. Robert-Demolaize, A. Rossi, B. Salvachua, E. Skordis, C. Tambasco, G. Valentino, T. Weiler, V. Vlachoudis, D. Wollmann

“…The CERN Large Hadron Collider (LHC) is designed to collide proton beams of unprecedented energy, in order to extend the frontiers of high-energy particle physics. …”
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Compensation of detector solenoid effects on the beam size in a linear collider by Yuri Nosochkov, Andrei Seryi

“…In this paper, we discuss the optics effects of the realistic detector solenoid field on beam size at the interaction point (IP) of a future linear collider and their compensation. It is shown that most of the adverse effects on the IP beam size arise only from the part of the solenoid field which overlaps and extends beyond the final focusing quadrupoles. …”
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Complete SMEFT predictions for four top quark production at hadron colliders by Rafael Aoude, Hesham El Faham, Fabio Maltoni, Eleni Vryonidou

“…Abstract We study four top quark production at hadron colliders in the Standard Model Effective Field Theory (SMEFT). …”
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Crilin: A Semi-Homogeneous Calorimeter for a Future Muon Collider by Sergio Ceravolo, Francesco Colao, Camilla Curatolo, Elisa Di Meco, Eleonora Diociaiuti, Donatella Lucchesi, Daniele Paesani, Nadia Pastrone, Gianantonio Pezzullo, Alessandro Saputi, Ivano Sarra, Lorenzo Sestini, Diego Tagnani

“…Calorimeters, as other detectors, have to face the increasing performance demands of the new energy frontier experiments. For a future Muon Collider the main challenge is given by the Beam Induced Background that may pose limitations to the physics performance. …”
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Spin-polarized electron beam generation in the colliding-pulse injection scheme by Zheng Gong, Michael J. Quin, Simon Bohlen, Christoph H. Keitel, Kristjan Põder, Matteo Tamburini

“…Employing colliding-pulse injection has been shown to enable the generation of high-quality electron beams from laser–plasma accelerators. …”
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Collimation-induced experimental background studies at the CERN Large Hadron Collider by R. Bruce, M. Huhtinen, A. Manousos, F. Cerutti, L. Esposito, R. Kwee-Hinzmann, A. Lechner, A. Mereghetti, D. Mirarchi, S. Redaelli, B. Salvachua

“…The data produced at the particle physics experiments at the Large Hadron Collider (LHC) contain not only the signals from the collisions, but also a background component from proton losses around the accelerator. …”
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Mechanical Design of an Electromagnetic Calorimeter Prototype for a Future Muon Collider by Daniele Paesani, Alessandro Saputi, Ivano Sarra

“…Measurement of physics processes at new energy frontier experiments requires excellent spatial, time, and energy resolutions to resolve the structure of collimated high-energy jets. In a future Muon Collider, beam-induced backgrounds (BIB) represent the main challenge in the design of the detectors and of the event reconstruction algorithms. …”
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Crystal-based pair production for a lepton collider positron source by L. Bandiera, L. Bomben, R. Camattari, G. Cavoto, I. Chaikovska, R. Chehab, D. De Salvador, V. Guidi, V. Haurylavets, E. Lutsenko, V. Mascagna, A. Mazzolari, M. Prest, M. Romagnoni, F. Ronchetti, F. Sgarbossa, M. Soldani, A. Sytov, M. Tamisari, V. Tikhomirov, E. Vallazza

“…The presented work opens the way for a realistic and detailed design of a hybrid crystal-based positron source for future lepton colliders.…”
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Anomalous violation of the local constant field approximation in colliding laser beams by Q. Z. Lv, E. Raicher, C. H. Keitel, K. Z. Hatsagortsyan

“…A similar phenomenon is also demonstrated for an electron colliding with an ultrashort laser pulse. These results indicate the necessity of amending laser-plasma kinetic simulations in multiple beam laser configurations.…”
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Colliding localized, lumpy holographic shocks with a granular nuclear structure by Sebastian Waeber, Laurence G. Yaffe

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The Magnetic Field in the Colliding Filaments G202.3+2.5 by Qi-Lao Gu, Tie Liu, Pak Shing Li, Zhi-Qiang Shen, Xunchuan Liu, Junhao Liu, Xing Lu, Julien Montillaud, Sihan Jiao, Mika Juvela, Mark G. Rawlings, Qizhou Zhang, Patrick Koch, Isabelle Ristorcelli, Jean-Sébastien Carriere, David Eden, Zhiyuan Ren, Ken’ichi Tatematsu, Naomi Hirano, Qiu-yi Luo, Xiaofeng Mai, Namitha Issac

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Shining light on magnetic monopoles through high-energy muon colliders by Ji-Chong Yang, Yu-Chen Guo, Bing Liu, Tong Li

“…This mass scale is unreachable at current colliders. Recently, the muon colliders have gained much attention in the community due to technological developments. …”
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A semi-passive beam dilution system for the FCC-ee collider by Alexander Krainer, Wolfgang Bartmann, Marco Calviani, Yann Dutheil, Anton Lechner, Antonio Perillo Marcone, Salim Ogur, Rebecca Ramjiawan

“…Abstract The operation modes for the proposed FCC-ee collider foresee a very small beam spot size and stored beam energies of up to 20.6 MJ in Z production. …”
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QCD corrections in $$tq\gamma $$ t q γ production at hadron colliders by Nikolaos Kidonakis, Nodoka Yamanaka

“…Abstract We study QCD corrections for the associated production of a single top quark and a photon ( $$tq\gamma $$ t q γ production) at hadron colliders. We calculate the NLO cross section at LHC and future collider energies for a variety of kinematical cuts, and we estimate uncertainties from scale dependence and from parton distributions. …”
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Beam dynamics simulation for the Compact Linear Collider drive-beam accelerator by Avni Aksoy, Daniel Schulte, Ömer Yavaş

“…In the Compact Linear Collider (CLIC) now being studied at CERN, the rf power which accelerates the main beam is provided by decelerating a high current drive beam. …”
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Aperture measurements with ac dipoles and movable collimators in the Large Hadron Collider by N. Fuster-Martínez, R. Bruce, M. Hofer, T. Persson, S. Redaelli, R. Tomás

“…In high intensity particle colliders, such as the CERN Large Hadron Collider (LHC), aperture measurements are crucial for a safe operation while optimizing the optics in order to reduce the size of the colliding beams and hence increase the luminosity. …”
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Hadron collider probes of the quartic couplings of gluons to the photon and Z boson by John Ellis, Shao-Feng Ge, Kai Ma

“…We also estimate the sensitivities to dimension-8 operators of experiments at possible future proton-proton colliders with centre-of-mass energies of 25, 50 and 100 TeV, and discuss possible measurements of the Z spin and angular correlations.…”
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Particle jets in colliding two ultraintense laser pulses of varying frequencies by Siddharth Tiwary, Naveen Kumar

“…We present results on the evolution of jets (electrons-positrons and photons) formed in colliding two ultraintense laser pulses with varying frequencies and amplitudes. …”
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