Author: "Pedro Schwaller" - Searchworks@Jio Institute Digital Library Search Results

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79 results on '"Pedro Schwaller"'

1. A coordinate-independent formalism for detecting high-frequency gravitational waves

Author: Wolfram Ratzinger, Sebastian Schenk, and Pedro Schwaller
Subjects: Axions and ALPs, Classical Theories of Gravity, Space-Time Symmetries, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract In an external electric or magnetic field, a gravitational wave (GW) may be converted into electromagnetic radiation. We present a coordinate-invariant framework to describe the GW signal in a detector that is based on this effect, such as cavities for axion searches. In this framework, we pay special attention to the definition of manifestly coordinate-independent expressions for the electromagnetic fields that an external observer would detect. A careful assessment of the detector’s perceived motion allows us to treat both its mechanical and its electromagnetic response to the GW consistently. We further introduce well-defined approximations for which this motion may be neglected, and hence provide suggestions on which coordinate frame is suitable to characterise the GW signal in practice. We illustrate our findings in two examples, an infinitesimally thin rod and a spherical electromagnetic cavity.
Published: 2024
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2. Primordial gravitational waves in the nano-Hertz regime and PTA data — towards solving the GW inverse problem

Author: Eric Madge, Enrico Morgante, Cristina Puchades-Ibáñez, Nicklas Ramberg, Wolfram Ratzinger, Sebastian Schenk, and Pedro Schwaller
Subjects: Cosmology of Theories BSM, Early Universe Particle Physics, Axions and ALPs, Phase Transitions in the Early Universe, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract In recent years, several pulsar timing array collaborations have reported first hints for a stochastic gravitational wave background at nano-Hertz frequencies. Here we elaborate on the possibility that this signal comes from new physics that leads to the generation of a primordial stochastic gravitational wave background. We propose a set of simple but concrete models that can serve as benchmarks for gravitational waves sourced by cosmological phase transitions, domain wall networks, cosmic strings, axion dynamics, or large scalar fluctuations. These models are then confronted with pulsar timing data and with cosmological constraints. With only a limited number of free parameters per model, we are able to identify viable regions of parameter space and also make predictions for future astrophysical and laboratory tests that can help with model identification and discrimination.
Published: 2023
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3. Cosmology with the Laser Interferometer Space Antenna

Author: Pierre Auclair, David Bacon, Tessa Baker, Tiago Barreiro, Nicola Bartolo, Enis Belgacem, Nicola Bellomo, Ido Ben-Dayan, Daniele Bertacca, Marc Besancon, Jose J. Blanco-Pillado, Diego Blas, Guillaume Boileau, Gianluca Calcagni, Robert Caldwell, Chiara Caprini, Carmelita Carbone, Chia-Feng Chang, Hsin-Yu Chen, Nelson Christensen, Sebastien Clesse, Denis Comelli, Giuseppe Congedo, Carlo Contaldi, Marco Crisostomi, Djuna Croon, Yanou Cui, Giulia Cusin, Daniel Cutting, Charles Dalang, Valerio De Luca, Walter Del Pozzo, Vincent Desjacques, Emanuela Dimastrogiovanni, Glauber C. Dorsch, Jose Maria Ezquiaga, Matteo Fasiello, Daniel G. Figueroa, Raphael Flauger, Gabriele Franciolini, Noemi Frusciante, Jacopo Fumagalli, Juan García-Bellido, Oliver Gould, Daniel Holz, Laura Iacconi, Rajeev Kumar Jain, Alexander C. Jenkins, Ryusuke Jinno, Cristian Joana, Nikolaos Karnesis, Thomas Konstandin, Kazuya Koyama, Jonathan Kozaczuk, Sachiko Kuroyanagi, Danny Laghi, Marek Lewicki, Lucas Lombriser, Eric Madge, Michele Maggiore, Ameek Malhotra, Michele Mancarella, Vuk Mandic, Alberto Mangiagli, Sabino Matarrese, Anupam Mazumdar, Suvodip Mukherjee, Ilia Musco, Germano Nardini, Jose Miguel No, Theodoros Papanikolaou, Marco Peloso, Mauro Pieroni, Luigi Pilo, Alvise Raccanelli, Sébastien Renaux-Petel, Arianna I. Renzini, Angelo Ricciardone, Antonio Riotto, Joseph D. Romano, Rocco Rollo, Alberto Roper Pol, Ester Ruiz Morales, Mairi Sakellariadou, Ippocratis D. Saltas, Marco Scalisi, Kai Schmitz, Pedro Schwaller, Olga Sergijenko, Geraldine Servant, Peera Simakachorn, Lorenzo Sorbo, Lara Sousa, Lorenzo Speri, Danièle A. Steer, Nicola Tamanini, Gianmassimo Tasinato, Jesús Torrado, Caner Unal, Vincent Vennin, Daniele Vernieri, Filippo Vernizzi, Marta Volonteri, Jeremy M. Wachter, David Wands, Lukas T. Witkowski, Miguel Zumalacárregui, James Annis, Fëanor Reuben Ares, Pedro P. Avelino, Anastasios Avgoustidis, Enrico Barausse, Alexander Bonilla, Camille Bonvin, Pasquale Bosso, Matteo Calabrese, Mesut Çalışkan, Jose A. R. Cembranos, Mikael Chala, David Chernoff, Katy Clough, Alexander Criswell, Saurya Das, Antonio da Silva, Pratika Dayal, Valerie Domcke, Ruth Durrer, Richard Easther, Stephanie Escoffier, Sandrine Ferrans, Chris Fryer, Jonathan Gair, Chris Gordon, Martin Hendry, Mark Hindmarsh, Deanna C. Hooper, Eric Kajfasz, Joachim Kopp, Savvas M. Koushiappas, Utkarsh Kumar, Martin Kunz, Macarena Lagos, Marc Lilley, Joanes Lizarraga, Francisco S. N. Lobo, Azadeh Maleknejad, C. J. A. P. Martins, P. Daniel Meerburg, Renate Meyer, José Pedro Mimoso, Savvas Nesseris, Nelson Nunes, Vasilis Oikonomou, Giorgio Orlando, Ogan Özsoy, Fabio Pacucci, Antonella Palmese, Antoine Petiteau, Lucas Pinol, Simon Portegies Zwart, Geraint Pratten, Tomislav Prokopec, John Quenby, Saeed Rastgoo, Diederik Roest, Kari Rummukainen, Carlo Schimd, Aurélia Secroun, Alberto Sesana, Carlos F. Sopuerta, Ismael Tereno, Andrew Tolley, Jon Urrestilla, Elias C. Vagenas, Jorinde van de Vis, Rien van de Weygaert, Barry Wardell, David J. Weir, Graham White, Bogumiła Świeżewska, Valery I. Zhdanov, and The LISA Cosmology Working Group
Subjects: Laser Interferometer Space Antenna (LISA), Cosmology, Atomic physics. Constitution and properties of matter, QC170-197
Abstract: Abstract The Laser Interferometer Space Antenna (LISA) has two scientific objectives of cosmological focus: to probe the expansion rate of the universe, and to understand stochastic gravitational-wave backgrounds and their implications for early universe and particle physics, from the MeV to the Planck scale. However, the range of potential cosmological applications of gravitational-wave observations extends well beyond these two objectives. This publication presents a summary of the state of the art in LISA cosmology, theory and methods, and identifies new opportunities to use gravitational-wave observations by LISA to probe the universe.
Published: 2023
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4. Theory, phenomenology, and experimental avenues for dark showers: a Snowmass 2021 report

Author: Guillaume Albouy, Jared Barron, Hugues Beauchesne, Elias Bernreuther, Marcella Bona, Cesare Cazzaniga, Cari Cesarotti, Timothy Cohen, Annapaola de Cosa, David Curtin, Zeynep Demiragli, Caterina Doglioni, Alison Elliot, Karri Folan DiPetrillo, Florian Eble, Carlos Erice, Chad Freer, Aran Garcia-Bellido, Caleb Gemmell, Marie-Hélène Genest, Giovanni Grilli di Cortona, Giuliano Gustavino, Nicoline Hemme, Tova Holmes, Deepak Kar, Simon Knapen, Suchita Kulkarni, Luca Lavezzo, Steven Lowette, Benedikt Maier, Seán Mee, Stephen Mrenna, Harikrishnan Nair, Jeremi Niedziela, Christos Papageorgakis, Nukulsinh Parmar, Christoph Paus, Kevin Pedro, Ana Peixoto, Alexx Perloff, Tilman Plehn, Christiane Scherb, Pedro Schwaller, Jessie Shelton, Akanksha Singh, Sukanya Sinha, Torbjörn Sjöstrand, Aris G. B. Spourdalakis, Daniel Stolarski, Matthew J. Strassler, Andrii Usachov, Carlos Vázquez Sierra, Christopher B. Verhaaren, and Long Wang
Subjects: Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract In this work, we consider the case of a strongly coupled dark/hidden sector, which extends the Standard Model (SM) by adding an additional non-Abelian gauge group. These extensions generally contain matter fields, much like the SM quarks, and gauge fields similar to the SM gluons. We focus on the exploration of such sectors where the dark particles are produced at the LHC through a portal and undergo rapid hadronization within the dark sector before decaying back, at least in part and potentially with sizeable lifetimes, to SM particles, giving a range of possibly spectacular signatures such as emerging or semi-visible jets. Other, non-QCD-like scenarios leading to soft unclustered energy patterns or glueballs are also discussed. After a review of the theory, existing benchmarks and constraints, this work addresses how to build consistent benchmarks from the underlying physical parameters and present new developments for the pythia Hidden Valley module, along with jet substructure studies. Finally, a series of improved search strategies is presented in order to pave the way for a better exploration of the dark showers at the LHC.
Published: 2022
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5. The ALPs from the top: searching for long lived axion-like particles from exotic top decays

Author: Adrian Carmona, Fatemeh Elahi, Christiane Scherb, and Pedro Schwaller
Subjects: Axions and ALPs, New Light Particles, Top FCNC, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We propose a search for long lived axion-like particles (ALPs) in exotic top decays. Flavour-violating ALPs appear as low energy effective theories for various new physics scenarios such as t-channel dark sectors or Froggatt-Nielsen models. In this case the top quark may decay to an ALP and an up- or charm-quark. For masses in the few GeV range, the ALP is long lived across most of the viable parameter space, suggesting a dedicated search. We propose to search for these long lived ALPs in t t ¯ $$ t\overline{t} $$ events, using one top quark as a trigger. We focus on ALPs decaying in the hadronic calorimeter, and show that the ratio of energy deposits in the electromagnetic and hadronic calorimeters as well as track vetoes can efficiently suppress Standard Model backgrounds. Our proposed search can probe exotic top branching ratios smaller than 10 −4 with a conservative strategy at the upcoming LHC run, and potentially below the 10 −7 level with more advanced methods. Finally we also show that measurements of single top production probe these branching ratios in the very short and very long lifetime limit at the 10 −3 level.
Published: 2022
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6. Charming ALPs

Author: Adrian Carmona, Christiane Scherb, and Pedro Schwaller
Subjects: Phenomenological Models, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract Axion-like particles (ALPs) are ubiquitous in models of new physics explaining some of the most pressing puzzles of the Standard Model. However, until relatively recently, little attention has been paid to its interplay with flavour. In this work, we study in detail the phenomenology of ALPs that exclusively interact with up-type quarks at the tree-level, which arise in some well-motivated ultra-violet completions such as QCD-like dark sectors or Froggatt-Nielsen type models of flavour. Our study is performed in the low-energy effective theory to highlight the key features of these scenarios in a model independent way. We derive all the existing constraints on these models and demonstrate how upcoming experiments at fixed-target facilities and the LHC can probe regions of the parameter space which are currently not excluded by cosmological and astrophysical bounds. We also emphasize how a future measurement of the currently unavailable meson decay D → π + invisible could complement these upcoming searches.
Published: 2021
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7. Collider constraints on dark mediators

Author: Hanna Mies, Christiane Scherb, and Pedro Schwaller
Subjects: Phenomenological Models, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We explore the constraints current collider searches place on a QCD-like dark sector. A combination of multi-jet, multi-jet plus missing energy and emerging jets searches is used to derive constraints on the mediator mass across the full range of the dark meson lifetimes for the first time. The dark sector inherits a flavour structure from the coupling between the dark quarks and the SM quarks through the mediator. When this is taken into account, the differently flavoured dark pions become distinguishable through their lifetime. We show that also in these cases the above mentioned searches remain sensitive, and we obtain limits on the mediator mass also for the flavoured scenario. We then contrast the constraints from collider searches with direct detection bounds on the dark matter candidate itself in both the flavoured and unflavoured scenario. Using a simple prescription it becomes possible to display all constraints in the dark matter and mediator mass plane. Constraints from direct detection tend to be stronger than the collider constraints, unless the coupling to the first generation quarks is suppressed, in which case the collider searches place the most stringent limits on the parameter space.
Published: 2021
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8. Shining light on the scotogenic model: interplay of colliders and cosmology

Author: Sven Baumholzer, Vedran Brdar, Pedro Schwaller, and Alexander Segner
Subjects: Beyond Standard Model, Cosmology of Theories beyond the SM, Neutrino Physics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract In the framework of the scotogenic model, which features radiative generation of neutrino masses, we explore light dark matter scenario. Throughout the paper we chiefly focus on keV-scale dark matter which can be produced either via freeze-in through the decays of the new scalars, or from the decays of next-to-lightest fermionic particle in the spectrum, which is produced through freeze-out. The latter mechanism is required to be suppressed as it typically produces a hot dark matter component. Constraints from BBN are also considered and in combination with the former production mechanism they impose the dark matter to be light. For this scenario we consider signatures at High Luminosity LHC and proposed future hadron and lepton colliders, namely FCC-hh and CLIC, focusing on searches with two leptons and missing energy as a final state. While a potential discovery at High Luminosity LHC is in tension with limits from cosmology, the situation greatly improves for future colliders.
Published: 2020
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9. Leptophilic dark matter from gauged lepton number: phenomenology and gravitational wave signatures

Author: Eric Madge and Pedro Schwaller
Subjects: Beyond Standard Model, Cosmology of Theories beyond the SM, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract New gauge symmetries often appear in theories beyond the Standard Model. Here we study a model where lepton number is promoted to a gauge symmetry. Anomaly cancellation requires the introduction of additional leptons, the lightest of which is a natural leptophilic dark matter candidate. We perform a comprehensive study of both collider and dark matter phenomenology. Furthermore we find that the model exhibits a first order lepton number breaking phase transition in large regions of parameter space. The corresponding gravitational wave signal is computed, and its detectability at LISA and other future GW detectors assessed. Finally we comment on the complementarity of dark matter, collider and gravitational wave observables, and on the potential reach of future colliders.
Published: 2019
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10. Audible axions

Author: Camila S. Machado, Wolfram Ratzinger, Pedro Schwaller, and Ben A. Stefanek
Subjects: Cosmology of Theories beyond the SM, Beyond Standard Model, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract Conventional approaches to probing axions and axion-like particles (ALPs) typically rely on a coupling to photons. However, if this coupling is extremely weak, ALPs become invisible and are effectively decoupled from the Standard Model. Here we show that such invisible axions, which are viable candidates for dark matter, can produce a stochastic gravitational wave background in the early universe. This signal is generated in models where the invisible axion couples to a dark gauge boson that experiences a tachyonic instability when the axion begins to oscillate. Incidentally, the same mechanism also widens the viable parameter space for axion dark matter. Quantum fluctuations amplified by the exponentially growing gauge boson modes source chiral gravitational waves. For axion decay constants f ≳ 1017 GeV, this signal is detectable by either pulsar timing arrays or space/ground-based gravitational wave detectors for a broad range of axion masses, thus providing a new window to probe invisible axion models.
Published: 2019
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11. The new νMSM (ννMSM): radiative neutrino masses, keV-scale dark matter and viable leptogenesis with sub-TeV new physics

Author: Sven Baumholzer, Vedran Brdar, and Pedro Schwaller
Subjects: Beyond Standard Model, Cosmology of Theories beyond the SM, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We study the scenario in which the Standard model is augmented by three generations of right-handed neutrinos and a scalar doublet. The newly introduced fields share an odd charge under a ℤ2 parity symmetry. This model, commonly known as “Scotogenic”, was designed to provide a mechanism for active neutrino mass generation as well as a viable dark matter candidate. In this paper we consider a scenario in which the dark matter particle is at the keV-scale. Such particle is free from X-ray limits due to the unbroken parity symmetry that forbids the mixing between active and right-handed neutrinos. The active neutrino masses are radiatively generated from the new scalars and the two heavier right-handed states with ∼ O $$ \mathcal{O} $$(100) GeV masses. These heavy fermions can produce the observed baryon asymmetry of the Universe through the combination of Akhmedov-Rubakov-Smirnov mechanism and recently proposed scalar decays. To the best of our knowledge, this is the first time that these two mechanisms are shown to be successful in any radiative model. We identify the parameter space where the successful leptogenesis is compatible with the observed abundance of dark matter as well as the measurements from the neutrino oscillation experiments. Interestingly, combining dark matter production and successful leptogenesis gives rise to strict limits from big bang nucleosynthesis which do not allow the mass of dark matter to lie above ∼ 10 keV, providing a phenomenological hint for considered low-scale dark matter. By featuring the keV-scale dark matter free from stringent X-ray limits, successful baryon asymmetry generation and non-zero active neutrino masses, the model is a direct analogue to the νMSM model proposed by Asaka, Blanchet and Shaposhnikov. Therefore we dub the presented framework as “The new νMSM” abbreviated as ννMSM.
Published: 2018
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12. A flavoured dark sector

Author: Sophie Renner and Pedro Schwaller
Subjects: Beyond Standard Model, Dark matter, Flavor physics, Hadron-Hadron scattering (experiments), Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We explore the phenomenology of a QCD-like dark sector which confines around the GeV scale. The dark sector inherits a flavour structure from a coupling between dark quarks and SM quarks via a heavy mediator, which leads to exciting new phenomena. While stable baryonic bound states are the dark matter candidates, the phenomenology is dominated by the lightest composite mesons, the dark pions, which can have decay lengths ranging from millimetres to hundreds of meters. For masses below 1.5 GeV, their exclusive decays to SM mesons are calculated for the first time by matching both dark and visible sectors to a chiral Lagrangian. Constraints from big bang nucleosynthesis, dark matter direct detection and flavour single out a small region of allowed parameter space for dark pion masses below 5 GeV. It is best probed by the fixed target experiments NA62 and SHiP, where dark pions can be produced copiously in rare decays like B → Kπ D . The dominant π D → K ± π ∓ and π D → 3π decay modes are a smoking gun for a CP-odd, flavour violating new resonance. Heavier dark pions are best searched for at the LHC, where they decay after hadronisation to produce jets which emerge into SM states within the detector. Here the flavour structure ensures different flavours emerge on different length scales, leading to a striking new feature in the emerging jets signature.
Published: 2018
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13. Runaway relaxion monodromy

Author: Liam McAllister, Pedro Schwaller, Geraldine Servant, John Stout, and Alexander Westphal
Subjects: Discrete Symmetries, Effective Field Theories, Flux compactifications, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We examine the relaxion mechanism in string theory. An essential feature is that an axion winds over N ≫ 1 fundamental periods. In string theory realizations via axion monodromy, this winding number corresponds to a physical charge carried by branes or fluxes. We show that — in the context of NS5-brane axion monodromy — this charge backreacts on the compact space, ruining the structure of the relaxion action. In particular, the barriers generated by strong gauge dynamics have height ∝ e −N , so the relaxion does not stop when the Higgs acquires a vev. Backreaction of monodromy charge can therefore spoil the relaxion mechanism. We comment on the limitations of technical naturalness arguments in this context.
Published: 2018
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14. Simplified models for displaced dark matter signatures

Author: Oliver Buchmueller, Albert De Roeck, Kristian Hahn, Matthew McCullough, Pedro Schwaller, Kevin Sung, and Tien-Tien Yu
Subjects: Beyond Standard Model, Dark matter, Hadron-Hadron scattering (experiments), Lifetime, Supersymmetry, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We propose a systematic programme to search for long-lived neutral particle signatures through a minimal set of displaced searches (dMETs). Our approach is to extend the well-established dark matter simplified models to include displaced vertices. The dark matter simplified models are used to describe the primary production vertex. A displaced secondary vertex, characterised by the mass of the long-lived particle and its lifetime, is added for the displaced signature. We show how these models can be motivated by, and mapped onto, complete models such as gauge-mediated SUSY breaking and models of neutral naturalness. We also outline how this approach may be used to extend other simplified models to incorporate displaced signatures and to characterise searches for long-lived charged particles. Displaced vertices are a striking signature which is often virtually background free, and thus provide an excellent target for the high-luminosity run of the Large Hadron Collider. The proposed models and searches provide a first step towards a systematic broadening of the displaced dark matter search programme.
Published: 2017
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15. Closing the window for compressed dark sectors with disappearing charged tracks

Author: Rakhi Mahbubani, Pedro Schwaller, and José Zurita
Subjects: Beyond Standard Model, Supersymmetric Standard Model, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We investigate the sensitivity at current and future hadron colliders to a heavy electrically-charged particle with a proper decay length below a centimetre, whose decay products are invisible due to below-threshold energies and/or small couplings to the Standard Model. A cosmologically-motivated example of a framework that contains such a particle is the Minimal Supersymmetric Standard Model in the limit of pure Higgsinos. The current hadron-collider search strategy has no sensitivity to the upper range of pure-Higgsino masses that are consistent with the thermal relic density, even at a future collider with 100 TeV centre-of-mass energy. We show that performing a disappearing track search within the inner 10 cm of detector volume would improve the reach in lifetime by a factor of 3 at the 14 TeV LHC and a further factor of 5 at a 100 TeV collider, resulting in around 10 events for 1.1 TeV thermal Higgsinos. In order to include the particles with the largest boost in the analysis, we furthermore propose a purely track-based search in both the central and forward regions, each of which would increase the number of events by another factor of 5, improving our reach at small lifetimes. This would allow us to definitively discover or exclude the experimentally-elusive pure-Higgsino thermal relic at a 100 TeV collider. Our results illustrate the importance of varying detector design when assessing the reach of future high energy colliders.
Published: 2017
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16. Erratum to: Closing the window for compressed dark sectors with disappearing charged tracks

Author: Rakhi Mahbubani, Pedro Schwaller, and José Zurita
Subjects: Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Published: 2017
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17. The Forward Physics Facility: Sites, experiments, and physics potential

Author: Julien Manshanden, Jonathan Gall, Luis A. Anchordoqui, Joseph Bramante, M. V. Diwan, Richard Jacobsson, Pedro Schwaller, Matthew Citron, Douglas Tuckler, Yasaman Farzan, Max Fieg, Giovanni De Lellis, Mary Hall Reno, Vishvas Pandey, Yu-Dai Tsai, Adam Ritz, Tomoko Ariga, Krzysztof Jodłowski, Torbjörn Sjöstrand, Sudip Jana, Adrian Carmona, Kincso Balazs, Francesco Giuli, Yong Du, Dipan Sengupta, Keping Xie, Mario Campanelli, John Osborne, Kevin J. Kelly, Victor P. Goncalves, Herbi K. Dreiner, Rikard Enberg, Brian Batell, Ahmed Ismail, Juan Rojo, Maria Vittoria Garzelli, Akitaka Ariga, Patrick Foldenauer, Francis Halzen, Michael Fucilla, Alessandro Papa, Fnu Karan Kumar, Antonia Di Crecsenzo, Pavel M. Nadolsky, Holger Schulz, Zhen Liu, Jonathan L. Feng, Ameen Ismail, Filippo Resnati, Peter B. Denton, Felix Kling, Juan Carlos Helo, Weidong Bai, Grigorios Chachamis, Rafal Maciula, Yue Zhang, Hans Dembinski, Antoni Szczurek, Saeid Foroughi-Abari, Francesco Giovanni Celiberto, Mohammed M. A. Mohammed, Nobuchika Okada, Josh Mcfayden, Ina Sarcevic, Anna Stasto, Zahra Tabrizi, Digesh Raut, Liam Dougherty, Alexander Friedland, Sebastian Trojanowski, Tyler B. Smith, Christiane Scherb, Martin Wolfgang Winkler, Jamie Boyd, Marco Guzzi, Roshan Mammen Abraham, Christopher S. Hill, Hidetoshi Otono, Yu Seon Jeong, Dennis Soldin, Albert De Roeck, Anchordoqui, Luis A., Ariga, Akitaka, Ariga, Tomoko, Bai, Weidong, Balazs, Kincso, Batell, Brian, Boyd, Jamie, Bramante, Joseph, Campanelli, Mario, Carmona, Adrian, Celiberto, Francesco G., Chachamis, Grigorio, Citron, Matthew, De Lellis, Giovanni, De Roeck, Albert, Dembinski, Han, Denton, Peter B., Di Crecsenzo, Antonia, Diwan, Milind V., Dougherty, Liam, Dreiner, Herbi K., Du, Yong, Enberg, Rikard, Farzan, Yasaman, Feng, Jonathan L., Fieg, Max, Foldenauer, Patrick, Foroughi-Abari, Saeid, Friedland, Alexander, Fucilla, Michael, Gall, Jonathan, Garzelli, Maria Vittoria, Giuli, Francesco, Goncalves, Victor P., Guzzi, Marco, Halzen, Franci, Helo, Juan Carlo, Hill, Christopher S., Ismail, Ahmed, Ismail, Ameen, Jacobsson, Richard, Jana, Sudip, Jeong, Yu Seon, Jodłowski, Krzysztof, Kelly, Kevin J., Kling, Felix, Kumar, Fnu Karan, Liu, Zhen, Maciuła, Rafał, Abraham, Roshan Mammen, Manshanden, Julien, Mcfayden, Josh, Mohammed, Mohammed M. A., Nadolsky, Pavel M., Okada, Nobuchika, Osborne, John, Otono, Hidetoshi, Pandey, Vishva, Papa, Alessandro, Raut, Digesh, Reno, Mary Hall, Resnati, Filippo, Ritz, Adam, Rojo, Juan, Sarcevic, Ina, Scherb, Christiane, Schulz, Holger, Schwaller, Pedro, Sengupta, Dipan, Sjöstrand, Torbjörn, Smith, Tyler B., Soldin, Denni, Stasto, Anna, Szczurek, Antoni, Tabrizi, Zahra, Trojanowski, Sebastian, Tsai, Yu-Dai, Tuckler, Dougla, Winkler, Martin W., Xie, Keping, and Zhang, Yue
Subjects: Physics - Instrumentation and Detectors, Physics beyond the Standard Model, engineering, General Physics and Astronomy, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), long-lived [particle], site, Neutrinos interactions, particle, long-lived, New physics, Detectors and Experimental Techniques, quantum chromodynamics, nonperturbative, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Luminosity (scattering theory), Large Hadron Collider, new physics, luminosity, high, density [dark matter], Instrumentation and Detectors (physics.ins-det), primary [vertex], High Energy Physics - Phenomenology, CERN LHC Coll, vertex: primary, luminosity: high, LHC, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, Particle Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics and Astronomy, Particle physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), interpretation of experiments: CERN LHC Coll, LHC (Large Hadron Collider), high [luminosity], Dark matter, quantum chromodynamics: nonperturbative, FOS: Physical sciences, dark matter: density, dark matter, Standard Model, 3 [flavor], TeV, ddc:530, flavor: 3, Particle Physics - Phenomenology, Astroparticle physics, Interaction point, flavor, 3, Accelerators and Storage Rings, Long-lived particles, nonperturbative [quantum chromodynamics], CERN LHC Coll [interpretation of experiments], vertex, primary, particle: long-lived, Experiments, acceptance
Abstract: Acknowledgments We thank the participants of the FPF meetings and the Snowmass working groups for discussions that have contributed both directly and indirectly to this study. We gratefully acknowledge the invaluable support of the CERN Physics Beyond Colliders study group and the work of CERN technical teams related to civil engineering studies (SCE-DOD), safety discussions (HSE-OHS, HSE-RP, EP-DI-SO), integration (EN-ACE), and discussions on services (EN-CV, EN-EL, EN-AA) and simulations (SY-STI). L. A. Anchordoqui is supported by U.S. National Science Foundation (NSF) Grant PHY-2112527. A. Ariga is supported by JSPS, Japan KAKENHI Grant JP20K23373 and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant 101002690). T. Ariga acknowledges support from JSPS, Japan KAKENHI Grant JP19H01909. B. Batell is supported by U.S. Department of Energy (DOE) Grant DE–SC0007914 and by PITT PACC, USA. The work of J. Bramante is supported by NSERC, Canada. F. G. Celiberto acknowledges support from the INFN/NINPHA project, USA and thanks the Università degli Studi di Pavia, Italy for the warm hospitality. G. Chachamis is supported by the Fundação para a Ciência e a Tecnologia (Portugal) under project CERN/FIS-PAR/0024/2019 and contract ‘‘Investigador auxiliar FCT - individual Call, Portugal CEECIND/03216/2017 and acknowledges funding from the European Union’s Horizon 2020 research and innovation programme (Grant 824093). P. B. Denton is supported by DOE, USA Grant DE-SC0012704. Y. Du was supported by National Science Foundation of China (NSFC) Grants 12022514 and 11875003. The work of J. L. Feng is supported in part by NSF, USA Grants PHY- 1915005 and PHY-2111427, Simons Investigator Award, USA #376204, Simons Foundation, USA Grant 623683, and Heising-Simons Foundation, USA Grants 2019-1179 and 2020-1840. The work of M. Fieg, T. B. Smith, and Y.-D. Tsai is supported in part by NSF Grant PHY-1915005. M. Fucilla, M. M. A. Mohammed, and A. Papa acknowledge support from the INFN/QFT@COLLIDERS, Italy project. The work of M. V. Garzelli was supported in part by the Bundesministerium für Bildung und Forschung (BMBF), Germany. V. P. Goncalves was partially financed by the Brazilian funding agencies CNPq, FAPERGS, and INCT-FNA (process number 464898/2014-5). M. Guzzi is supported in part by NSF, USA Grants PHY- 1820818 and PHY-2112025. J. C. Helo acknowledges support from ANID FONDECYT-Chile Grant 1201673 and from ANID Millennium Science Initiative Program ICN2019 044. K. Jodłowski is supported by the National Science Centre, Poland, Grant 2015/18/A/ST2/00748. Ahmed Ismail and R. Mammen Abraham are supported by DOE, USA Grant DE-SC0016013. Ameen Ismail is supported by NSERC, Canada (reference number 557763) and by NSF, USA Grant PHY-2014071. Y. S. Jeong is supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT: Ministry of Science and ICT) (2021R1A2C1009296). The work of F. Kling is supported by DOE, USA Grant DE-AC02-76SF00515 and by the Deutsche Forschungsgemeinschaft under Germany’s Excellence Strategy – EXC 2121 Quantum Universe – 390833306. P. Nadolsky is supported by DOE, USA Grant DE-SC0010129. H. Otono acknowledges support from JSPS, Japan KAKENHI Grant JP20H01919. V. Pandey is supported by DOE, USA Grant DE-SC-0009824. M. H. Reno is supported in part by DOE, USA Grant DE-SC-0010113. The work of A. Ritz is supported by NSERC, Canada, Canada. The work of D. Sengupta is supported by NSF, USA Grant PHY-1915147. T. Sjöstrand is supported by Swedish Research Council Grant 2016-05996. D. Soldin acknowledges support from the NSF, USA Grant PHY-1913607. S. Trojanowski is supported by the grant ‘‘AstroCeNT: Particle Astrophysics Science and Technology Centre’’ carried out within the International Research Agendas programme of the Foundation for Polish Science financed by the European Union under the European Regional Development Fund, and by the Polish Ministry of Science and Higher Education through its scholarship for young and outstanding scientists (decision 1190/E-78/STYP/14/2019). K. Xie is supported by DOE, USA Grant DE-FG02-95ER40896, NSF, USA Grant PHY- 1820760, and in part by PITT PACC. Parts of this work have been supported by Fermi Research Alliance, LLC, USA under Contract DE-AC02-07CH11359 with the DOE., The Forward Physics Facility (FPF) is a proposal to create a cavern with the space and infrastructure to support a suite of far-forward experiments at the Large Hadron Collider during the High Luminosity era. Located along the beam collision axis and shielded from the interaction point by at least 100 m of concrete and rock, the FPF will house experiments that will detect particles outside the acceptance of the existing large LHC experiments and will observe rare and exotic processes in an extremely low-background environment. In this work, we summarize the current status of plans for the FPF, including recent progress in civil engineering in identifying promising sites for the FPF and the experiments currently envisioned to realize the FPF's physics potential. We then review the many Standard Model and new physics topics that will be advanced by the FPF, including searches for long-lived particles, probes of dark matter and dark sectors, high-statistics studies of TeV neutrinos of all three flavors, aspects of perturbative and non-perturbative QCD, and high-energy astroparticle physics., ANID FONDECYT-Chile 1201673, Fermi Research Alliance DE-AC02-07CH11359, HSE-OHS, HSE-RP, NINPHA, PITT PACC, SY-STI, National Science Foundation PHY-2112527, U.S. Department of Energy DE–SC0007914, Simons Foundation 376204, 623683, Fuel Cell Technologies Program 824093, DE-SC0012704, Horizon 2020 Framework Programme, First Peoples Fund, Heising-Simons Foundation 2019-1179, 2020-1840, Natural Sciences and Engineering Research Council of Canada, European Commission, European Research Council, Deutsche Forschungsgemeinschaft 390833306, DE-SC-0009824, DE-SC-0010113, DE-SC0010129, JP20H01919, PHY-1915147, Japan Society for the Promotion of Science JP20K23373, National Natural Science Foundation of China 11875003, 12022514, PHY-1915005, PHY-2111427, Fundação para a Ciência e a Tecnologia CERN/FIS-PAR/0024/2019, Bundesministerium für Bildung und Forschung, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Ministry of Science, ICT and Future Planning 2021R1A2C1009296, DE-AC02-76SF00515, National Research Foundation of Korea, Instituto Nazionale di Fisica Nucleare, Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul, Narodowe Centrum Nauki 2015/18/A/ST2/00748, 557763, DE-SC0016013, PHY-2014071, Vetenskapsrådet 2016-05996, PHY-1913607, Ministerstwo Edukacji i Nauki 1190/E-78/STYP/14/2019, DE-FG02-95ER40896, PHY-1820760, Università degli Studi di Pavia, Horizon 2020 101002690, JP19H01909, European Regional Development Fund, Instituto Nacional de Ciência e Tecnologia: Física Nuclear e Aplicações 464898/2014-5, PHY-1820818, PHY-2112025, Agencia Nacional de Investigación y Desarrollo ICN2019 044
Published: 2022
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18. Gravitational waves from dark SU(3) Yang-Mills theory

Author: Enrico Morgante, Nicklas Ramberg, and Pedro Schwaller
Abstract: We analyze the phase transition in improved holographic QCD to obtain an estimate of the gravitational wave signal emitted in the confinement transition of a pure SU(3) Yang-Mills dark sector. We derive the effective action from holography and show that the energy budget and duration of the phase transition can be calculated with minor errors. These are used as input to obtain a prediction of the gravitational wave signal. To our knowledge, this is the first computation of the gravitational wave signal in a holographic model designated to match lattice data on the thermal properties of pure Yang-Mills.
Published: 2023

19. Audible axions with a booster: Stochastic gravitational waves from rotating ALPs

Author: Eric Madge, Wolfram Ratzinger, Daniel Schmitt, and Pedro Schwaller
Subjects: High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, General Physics and Astronomy, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: Gravitational waves provide a novel way to probe axions or axion-like particles coupled to a dark photon field, even in the absence of couplings to Standard Model particles. In the conventional misalignment mechanism, the generation of an observable stochastic gravitational wave background, however, requires large axion decay constants. We here investigate the gravitational wave signal generated within the kinetic misalignment scenario, where the axion is assumed to have a large initial velocity. Its kinetic energy then provides a sufficiently high energy budget to generate a detectable gravitational wave signal also at lower values of the decay constant. We obtain an analytic estimate as well as perform numerical simulations of the corresponding gravitational wave signal, and evaluate its detectability at current and future gravitational wave observatories. We further present the corresponding projected constraints on the parameter space of the model, along with the parameter regions in which the dark photon or axion constitute dark matter, or in which the baryon asymmetry of the Universe is generated via the axiogenesis mechanism. Finally we compute the GW production from the fragmentation of rotating axions, which is however difficult to observe experimentally., Comment: 26 pages, 9 figures + appendix
Published: 2022
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20. Audible axions

Author: Wolfram Ratzinger, Pedro Schwaller, Camila S. Machado, and Ben A. Stefanek
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Gauge boson, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Photon, Gravitational wave, Physics::Instrumentation and Detectors, media_common.quotation_subject, Dark matter, High Energy Physics::Phenomenology, FOS: Physical sciences, Cosmology of Theories beyond the SM, Universe, Standard Model, Gravitational wave background, High Energy Physics - Phenomenology, High Energy Physics::Theory, High Energy Physics - Phenomenology (hep-ph), Beyond Standard Model, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Axion, Astrophysics - Cosmology and Nongalactic Astrophysics, media_common
Abstract: Conventional approaches to probing axions and axion-like particles (ALPs) typically rely on a coupling to photons. However, if this coupling is extremely weak, ALPs become invisible and are effectively decoupled from the Standard Model. Here we show that such invisible axions, which are viable candidates for dark matter, can produce a stochastic gravitational wave background in the early universe. This signal is generated in models where the invisible axion couples to a dark gauge boson that experiences a tachyonic instability when the axion begins to oscillate. Incidentally, the same mechanism also widens the viable parameter space for axion dark matter. Quantum fluctuations amplified by the exponentially growing gauge boson modes source chiral gravitational waves. For axion decay constants $f \gtrsim 10^{17}$ GeV, this signal is detectable by either pulsar timing arrays or space/ground-based gravitational wave detectors for a broad range of axion masses, thus providing a new window to probe invisible axion models., 8 pages, 4 figures. References added, version submitted to JHEP
Published: 2019
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21. Gravitational Wave Echo of Relaxion Trapping

Author: Pedro Schwaller, Abhishek Banerjee, Eric Madge, Gilad Perez, and Wolfram Ratzinger
Subjects: Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Gravitational wave, Electroweak interaction, Dark matter, FOS: Physical sciences, Hierarchy problem, Parameter space, Instability, Dark photon, Gravitational wave background, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Quantum electrodynamics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: To solve the hierarchy problem, the relaxion must remain trapped in the correct minimum, even if the electroweak symmetry is restored after reheating. In this scenario, the relaxion starts rolling again until the backreaction potential, with its set of local minima, reappears. Depending on the time of barrier reappearance, Hubble friction alone may be insufficient to retrap the relaxion in a large portion of the parameter space. Thus, an additional source of friction is required, which might be provided by coupling to a dark photon.The dark photon experiences a tachyonic instability as the relaxion rolls, which slows down the relaxion by backreacting to its motion, and efficiently creates anisotropies in the dark photon energy-momentum tensor, sourcing gravitational waves. We calculate the spectrum of the resulting gravitational wave background from this new mechanism, and evaluate its observability by current and future experiments. We further investigate the possibility that the coherently oscillating relaxion constitutes dark matter and present the corresponding constraints from gravitational waves., 17 pages, 10 figures; v2: updated fifth-force constraints, included ancillary material, version matches the one published in PRD
Published: 2021

22. Charming ALPs

Author: Pedro Schwaller, Adrian Carmona, and Christiane Scherb
Subjects: Nuclear and High Energy Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, FOS: Physical sciences, QC770-798, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Nuclear and particle physics. Atomic energy. Radioactivity, 0103 physical sciences, 010306 general physics, Phenomenological Models
Abstract: We thank Felix Kahlhofer and Fatih Ertas for useful feedback. AC thanks Mikael Chala, Jorge Martin-Camalich, Matthias Neubert and Robert Ziegler for fruitful discussions. AC acknowledges funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 754446 and UGR Research and Knowledge Transfer Found - Athenea3i. Work in Mainz was supported by the Cluster of Excellence Precision Physics, Fundamental Interactions, and Structure of Matter (PRISMA+ EXC 2118/1) funded by the German Research Foundation (DFG) within the German Excellence Strategy (Project ID 39083149), and by grant 05H18UMCA1 of the German Federal Ministry for Education and Research (BMBF)., Axion-like particles (ALPs) are ubiquitous in models of new physics explaining some of the most pressing puzzles of the Standard Model. However, until relatively recently, little attention has been paid to its interplay with flavour. In this work, we study in detail the phenomenology of ALPs that exclusively interact with up-type quarks at the tree-level, which arise in some well-motivated ultra-violet completions such as QCD-like dark sectors or Froggatt-Nielsen type models of flavour. Our study is performed in the low-energy effective theory to highlight the key features of these scenarios in a model independent way. We derive all the existing constraints on these models and demonstrate how upcoming experiments at fixed-target facilities and the LHC can probe regions of the parameter space which are currently not excluded by cosmological and astrophysical bounds. We also emphasize how a future measurement of the currently unavailable meson decay D -> pi + invisible could complement these upcoming searches., European Commission 754446, UGR Research and Knowledge Transfer Found - Athenea3i, German Research Foundation (DFG) EXC 2118/1 39083149, Federal Ministry of Education & Research (BMBF) 05H18UMCA1
Published: 2021

23. Collider constraints on dark mediators

Author: Hanna Mies, Christiane Scherb, and Pedro Schwaller
Subjects: Quark, Nuclear and High Energy Physics, Particle physics, Meson, High Energy Physics::Lattice, Dark matter, Flavour, FOS: Physical sciences, Parameter space, 01 natural sciences, law.invention, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Pion, law, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, ddc:530, 010306 general physics, Collider, Phenomenological Models, Physics, Missing energy, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, High Energy Physics - Phenomenology, lcsh:QC770-798, High Energy Physics::Experiment
Abstract: Journal of high energy physics : JHEP 2021(4), 49 (2021). doi:10.1007/JHEP04(2021)049, Published by Springer, Berlin ; Heidelberg
Published: 2020
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24. Gravitational wave probes of axionlike particles

Author: Ben A. Stefanek, Camila S. Machado, Pedro Schwaller, and Wolfram Ratzinger
Subjects: Physics, Particle physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, Gravitational wave, media_common.quotation_subject, FOS: Physical sciences, Observable, Parameter space, 01 natural sciences, Dark photon, Universe, Standard Model, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Pulsar, 0103 physical sciences, 010306 general physics, Axion, Astrophysics - Cosmology and Nongalactic Astrophysics, media_common
Abstract: We have recently shown that axions and axion-like particles (ALPs) may emit an observable stochastic gravitational wave (GW) background when they begin to oscillate in the early universe. In this note, we identify the regions of ALP parameter space which may be probed by future GW detectors, including ground- and space-based interferometers and pulsar timing arrays. Interestingly, these experiments have the ability to probe axions from the bottom up, i.e. in the very weakly coupled regime which is otherwise unconstrained. Furthermore, we discuss the effects of finite dark photon mass and kinetic mixing on the mechanism, as well as the (in)sensitivity to couplings of the axion to Standard Model fields. We conclude that realistic axion and ALP scenarios may indeed be probed by GW experiments in the future, and provide signal templates for further studies., 5 pages, 3 figures, version published in PRD
Published: 2020

25. Discovering the h→Zγ decay in tt¯ associated production

Author: Florian Goertz, Pedro Schwaller, Eric Madge, and Valentin Tenorth
Subjects: Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Coupling (probability), 01 natural sciences, 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, Production (computer science), 010306 general physics, Spin-½, Bar (unit)
Abstract: We explore the prospects to discover the $h \to Z \gamma$ decay in $t\bar t$-associated production, featuring a signal-to-background ratio of ${\cal O}(1)$. Performing a detailed analysis of the semi-leptonic $t \bar t $-decay channel, we demonstrate that the production mode could lead to a $\sim5\,\sigma$ discovery at the high-luminosity LHC, while the effective $h Z \gamma$ coupling could be extracted with a $\sim15\,\%$ accuracy. Extending the analysis to potential future $pp$ colliders with 27 TeV and 100 TeV center-of-mass energies, we also show that the latter would allow precision measurements at the few percent level, rendering possible precise extractions of the spin and CP properties of the Higgs boson.
Published: 2020
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26. Detecting gravitational waves from cosmological phase transitions with LISA: an update

Author: Germano Nardini, Mikael Chala, David J. Weir, G. C. Dorsch, Geraldine Servant, Jonathan Kozaczuk, Pedro Schwaller, Chiara Caprini, Stephan J. Huber, Mark Hindmarsh, Anders Tranberg, Kari Rummukainen, Thomas Konstandin, Jose Miguel No, AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)
Subjects: Phase transition, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics beyond the Standard Model, Dark matter, standard model, FOS: Physical sciences, Context (language use), gravitational radiation: direct detection, 01 natural sciences, dark matter, bubble: nucleation, Gravitational waves, Theoretical physics, High Energy Physics - Phenomenology (hep-ph), effective field theory, 0103 physical sciences, Effective field theory, energy: density, numerical calculations, Cosmological phase transitions, perturbation theory, Physics, Matematikk og Naturvitenskap: 400::Fysikk: 430 [VDP], wave: acoustic, LISA, COSMIC cancer database, 010308 nuclear & particles physics, Gravitational wave, new physics, Gravitational theory, gravitational radiation, Astronomy and Astrophysics, critical phenomena, gravitational radiation detector, High Energy Physics - Phenomenology, Gravitational sources, gravitational radiation: emission, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Higgs model, Perturbation theory (quantum mechanics), gravitational radiation: power spectrum, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], dilaton, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: MC was funded by the Royal Society under the Newton International Fellowship program. GD would like to thank CNPq (Brazil) for financial support. MH was supported by the Science and Technology Facilities Council (grant number ST/P000819/1), and the Academy of Finland (grant number 286769). SJH was supported by the Science and Technology Facilities Council (grant number ST/P000819/1). The work of JK was supported by Department of Energy (DOE) grant DE-SC0019195 and NSF grant PHY-1719642. TK and GS are funded by the Deutsche Forschungsgemeinschaft under Germany's Excellence Strategy - EXC 2121 \Quantum Universe" - 390833306. JMN is supported by Ramon y Cajal Fellowship contract RYC-2017-22986, and also acknowledges support from the Spanish MINECO's "Centro de Excelencia Severo Ochoa" Programme under grant SEV-2016-0597, from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreements 690575 (RISE InvisiblesPlus) and 674896 (ITN ELUSIVES) and from the Spanish Proyectos de I+D de Generacion de Conocimiento via grant PGC2018-096646-A-I00. KR is funded by the Academy of Finland grants 308791, 319066 and 320123. PS is supported by the Cluster of Excellence "Precision Physics, Fundamental Interactions, and Structure of Matter"(PRISMA+ EXC 2118/1) funded by the German Research Foundation(DFG). PS would like to thank Moritz Breitbach and Eric Madge for providing the data for figures (14), (15) and (16), and Eric Madge for checking the ptplot code. DJW (ORCID ID 0000-00016986-0517) was supported by an Science and Technology Facilities Council Ernest Rutherford Fellowship, grant no. ST/R003904/1, by the Research Funds of the University of Helsinki, and by the Academy of Finland, grant nos. 286769, 324882 and 328958. The original LISA Cosmology Working Group preprint number of this paper is \LISA CosWG-19-04"., We investigate the potential for observing gravitational waves from cosmological phase transitions with LISA in light of recent theoretical and experimental developments. Our analysis is based on current state-of-the-art simulations of sound waves in the cosmic fluid after the phase transition completes. We discuss the various sources of gravitational radiation, the underlying parameters describing the phase transition and a variety of viable particle physics models in this context, clarifying common misconceptions that appear in the literature and identifying open questions requiring future study. We also present a web-based tool, PTPlot, that allows users to obtain up-to-date detection prospects for a given set of phase transition parameters at LISA., Royal Society under the Newton International Fellowship program, National Council for Scientific and Technological Development (CNPq), UK Research & Innovation (UKRI) Science & Technology Facilities Council (STFC) ST/P000819/1, Academy of Finland European Commission 286769 308791 319066 320123 324882 328958, United States Department of Energy (DOE) DE-SC0019195, National Science Foundation (NSF) PHY-1719642, German Research Foundation (DFG) EXC 2121 390833306, Spanish Government RYC-2017-22986, Spanish MINECO's "Centro de Excelencia Severo Ochoa" Programme SEV-2016-0597, European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant 690575 674896, Spanish Proyectos de I+D de Generacion de Conocimiento PGC2018-096646-A-I00, German Research Foundation (DFG) EXC 2118/1, Science and Technology Facilities Council Ernest Rutherford Fellowship 0000-00016986-0517 ST/R003904/1, Research Funds of the University of Helsinki
Published: 2020
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27. HE-LHC: The High-Energy Large Hadron Collider Future Circular Collider Conceptual Design Report Volume 4

Author: Pushpalatha C Bhat, B. Seeber, C. Pagliarone, Marco Statera, Victor P. Goncalves, Daria Astapovych, W. Bartmann, S. Iwamoto, M. Mentink, Alessandro Tricoli, E. R. Bielert, Laurent Chevalier, Patrick Koppenburg, Marco Calviani, C. Montag, P. Spiller, Jan Uythoven, P. Di Nezza, G. Guillermo Canton, B. Sailer, Markus Elsing, Sara Khatibi, Luca Vecchi, Luigi Palumbo, J. P. Penttinen, T. Podzorny, Maneesh Kumar, J. M. Rifflet, C. Kotnig, Jean Zinn-Justin, Christopher B. Verhaaren, A. Chernoded, Alessandro Bertarelli, L. M. Tkachenko, C. Koeberl, P. J. Mallon, M. Takeuchi, W. Venturini Delsolaro, G. Lamanna, S. Weinzierl, J. Gao, W. Kaabi, David D'Enterria, D. Barna, Paolo Castelnovo, Rajat Gupta, Oliver Boine-Frankenheim, Adarsh Pyarelal, Andreas Salzburger, Tessa Charles, M.E. Biagini, O. Panella, M. Stuart, A. Kollegger, V. Garcia Diaz, Olcay Bolukbasi, Maurizio Pierini, H. Aksakal, Tord Riemann, Abhishek M. Iyer, V. Shiltsev, D. Buttazzo, J. Blümlein, Prateek Agrawal, L. Sestini, Martin Bauer, Felicitas Pauss, S. Fiorendi, F. Bossu, Marco Nardecchia, C. Leonidopoulos, Wojciech Kotlarski, A. Saba, I. Bautista-Guzmán, W. Hillert, Giorgio Ambrosio, T. Lehtinen, Michael Andrew Parker, Silvia Taroni, Gian F. Giudice, Ph. Lebrun, Johann A. Briffa, T. Risselada, Giuseppe Lerner, A. Lechner, L. S. Miralles, M. Kuze, J. M. Valet, P. S. B. Dev, S. Holleis, Ph. Schwemling, M. Biglietti, S. Banerjee, Thomas Schörner-Sadenius, A. Sanz Ull, V. Tikhomirov, S. Savelyeva, Jiayin Gu, D. Zhou, Federico Ravotti, S. A. Bogacz, Daniele Mirarchi, R. Tomás García, Yann Coadou, F. Yu, Y. Cai, T. Lari, F. Holdener, D. Shwartz, C. Bhat, Ramesh Gupta, Markus Klute, E. Palmieri, P. Collier, Branislav Sitar, Yves Sirois, Livio Fanò, S. Rojas-Torres, E. Locci, Ruben Garcia Alia, I. Božović Jelisavić, R. Chehab, J. A. Aguilar-Saavedra, M. Pasquali, A. Di Cicco, Bernhard Auchmann, Klaus Heinemann, Alessia Tricomi, D. Lucchesi, B. Haerer, M. Morrone, Paolo Giacomelli, Sonia Carra, A. Senol, Ivan Koop, Luca Silvestrini, Anna Stakia, Heather Gray, E. Skordis, A. D. Kovalenko, Paul Langacker, R. Li, Bernardo Bordini, R. Rata, Arjan Verweij, Shehu S. AbdusSalam, Andrey Karyukhin, U. van Rienen, Gianluigi Arduini, Bernhard Holzer, S. A. Nikitin, S. S. Kozub, Satoshi Mishima, B. Di Micco, S. Izquierdo Bermudez, N. Pukhaeva, Nigel Watson, F. Prino, Jean-Michel Sallese, Sotirios Vlachos, Alessandro Vicini, A. Valassi, Daniel Treille, F. Dordei, A. M. Fernandez Navarro, B. Dziewit, Marcello Abbrescia, J. M. Hauptman, I. Chaikovska, Paolo Giubellino, Michael J. Baker, V.V. Kashikhin, Friedrich Lackner, Filippo Sala, A. Langner, D. Pulikowski, H. Eriksson, Matteo Turri, Andrea Wulzer, M. Aiba, Lisa Borgonovi, I. Morozov, V. Haurylavets, J. F. Croteau, S. Boselli, L. A. Gonzalez Gomez, Claudia Tambasco, F. Mahmoudi, Sébastien Descotes-Genon, A. Luciani, Pavel Piminov, M. Varasteh, T. Herzig, Sandra Aumon, Cristina Bernini, Joseph Bramante, Roberta Arnaldi, G. Zick, Daniel Schulte, R. Santoro, Anna Kulesza, I. Turk Cakir, M. Nonis, Silvia Posada Arias, Livia Soffi, T. Wojtoń, E. Cennini, Florian Bauer, B. Rousset, J.-L. Grenard, C. Neubüser, Frederic Derue, Loukas Gouskos, Rainer Wallny, G. Calderini, M. Merk, M. Mühlegger, Roberto Cimino, M. Ramsey-Musolf, P. Rebello Teles, Mario Galanti, Mikhail Shaposhnikov, A. Andreazza, Maria Vittoria Garzelli, Masaya Ishino, José W. F. Valle, Colin Bernet, G. Velev, Cristina Botta, E. Fischer, J. Malclés, Giuseppe Montenero, Tripurari Srivastava, E. Renner, Shahnam Gorgi Zadeh, D. Cantore-Cavalli, Paul Laycock, J. Komppula, Simon C. Hopkins, Helmut Burkhardt, Eric Lancon, I. Aichinger, Andre Sznajder, F. Bordry, Massimo Giovannozzi, Aidan Robson, Anna Giunta, A. Carvalho, S. Farinon, Daniel Wollmann, M. Fouaidy, Martti Raidal, R. Gerard, Giovanni Volpini, U. Niedermayer, A. Alekou, Alexander J.G. Lunt, Vincenzo Cavasinni, Andrzej Siodmok, U. Kaya, Matthias Schott, Marumi Kado, S. A. 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Gobbi, Michael Hance, A. J. Barr, V. Del Duca, V. Guzey, M. Pont, Michele Selvaggi, Oliver Brüning, J. Barreiro Guimarães da Costa, A. Drago, Y. Zhang, Giovanni Punzi, Viktor Matveev, Anadi Canepa, Clemens Lange, B. L. Militsyn, Martijn Mulders, Max Klein, V. D’Auria, M. Mylona, Valeria Braccini, S. DasBakshi, David Calvet, Sophia Borowka, David Marzocca, S. Jadach, A. A. Pankov, Christophe Ochando, A. A. Tudora, I. Masina, Jure Zupan, A. Preinerstorfer, Benjamin Fuks, H. K. Soltveit, G. Rolando, E.E. Perepelkin, T. G. Rizzo, Saleh Sultansoy, Federico Roncarolo, K. Elsener, R. Q. Pan, P. Zhuang, David Attié, Jac Perez, K. Kravalis, F. Anulli, V. Ruhlmann-Kleider, S. Malvezzi, Steffen A. Bass, E. La Francesca, Heinz Pernegger, K. Grzanka, M. T. Tiirakari, Alberto Ventura, Alessandro Cerri, Marco Peruzzi, Eric Montesinos, O. Etisken, F. Grancagnolo, S. Kartal, H. Humer, Oliver Fischer, M. Primavera, Marco Toliman Lucchini, P. Vedrine, Felix Kling, M. Altınlı, Sergio Calatroni, C. Han, Olivier Leroy, R. T. D’Agnolo, N. Klinkenberg, A. Audurier, Tatsushi Nakamoto, Ali Bozbey, Bernd A. Kniehl, Carl J. Debono, I. P. J. Shipsey, Gregorio Bernardi, Paolo Nason, William James Fawcett, J. M. Jiménez, D. Denisov, M. Serluca, David Curtin, Arif Akhundov, M. García Pérez, Iacopo Vivarelli, Emanuele Bacchiocchi, Markus Zerlauth, Julia Hrdinka, F. Butin, F. Müller, D. Tikhonov, Jorg Wenninger, A. Kilic, Fabrizio Ferro, J. Tanaka, S. A. Antipov, Miroslav Atanasov, S. Kuttimalai, A. Y. Starikov, F. R. Blánquez, S. V. Furuseth, G. Gaudio, L. Malgeri, J. Curti, B. Turbiarz, S. Li, A. Romanov, Costas G. Papadopoulos, Brennan Goddard, Frank Krauss, Lidija Zivkovic, Toms Torims, Michaela Lackner, D. A. Lyubimtsev, G. Borghello, J. F. Grosse-Oetringhaus, A. Bogomyagkov, H. Duran Yildiz, N. Foppiani, Arthur Schaffer, J. Zhou, D. Liberati, Vincenzo Guidi, Naeem A. Tahir, M. Besançon, Daniel Schoerling, Joe Incandela, Giacomo Polesello, O. Cakir, I. Ruehl, Ruggero Vaglio, Z. Zhang, Bruno Spataro, Davide Tommasini, F. Millet, H. D. Yoo, Carlo V. Fiorio, S. Deghaye, C. Bozzi, A. Shivaji, G. Corcella, I. Bellafont, Valentina Mariani, D. E. Martins, Michael Syphers, C. Hati, Peter Marquard, Nicola Bacchetta, Matthew Crouch, David Woog, Oliver Kortner, A. Milanese, Ricardo Gonçalo, Guido Montagna, Mikhail Zobov, F. Bedeschi, Eugene Bulyak, M. Aburaia, R. Tenchini, G. Marchiori, H. Rafique, G. Calderola, M. Antonello, Andrea Thamm, S. Glukhov, F. Hug, Robert Ruprecht, Veysi Erkcan Ozcan, K. Lee, Angelo Infantino, V. Makarenko, Z. Nergiz, Sergei Chekanov, Benjamin C. Allanach, C. Dachauer, H. Zhang, C. Biscari, A. J. Lankford, Scott Thomas, P. Kostka, Thomas Gehrmann, O. Azzolini, M. Ploskon, S. F. Ge, K. Oide, Andrea Bastianin, Daniela Bortoletto, Ingo Schienbein, J. L. Biarrotte, M. van Leeuwen, D. Stöckinger, Harald Ita, J. Katharina Behr, A. Cholakian, T. Kwon, L. Medina, Evgeny Starchenko, G. Mancinelli, L. Zanotto, F. Menez, L. Bellagamba, J. P. 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Perez Codina, Roman Martin, Elias Metral, B. Hegner, L. Zawiejski, Efe Yazgan, F. Couderc, G. Tonelli, G. Castorina, Patrizia Azzi, A. De Roeck, Jean-Philippe Lansberg, Riccardo Valente, A. David, F. Robert, Jeremi Niedziela, Anna Grassellino, Marie-Hélène Genest, V. Tisserand, A. Kilpinen, Y. K. Kim, A. Dominjon, Andrej Arbuzov, David Amorim, L. Kretzschmar, E. Bruna, Sergey Polozov, Vyacheslav Klyukhin, Hubert Kroha, O. Amstutz, A. Vitrano, Raymond Veness, Tilman Plehn, M. A. Mahmoud, Uşak Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, FCC Collaboration (Ukupan broj autora: 1363), FCC Collaboration, Abada, A., Abbrescia, M., Abdussalam, S. S., Abdyukhanov, I., Abelleira Fernandez, J., Abramov, A., Aburaia, M., Acar, A. O., Adzic, P. R., Agrawal, P., Aguilar-Saavedra, J. A., Aguilera-Verdugo, J. J., Aiba, M., Aichinger, I., Aielli, G., Akay, A., Akhundov, A., Aksakal, H., Albacete, J. L., Albergo, S., Alekou, A., Aleksa, M., Aleksan, R., Alemany Fernandez, R. M., Alexahin, Y., Alia, R. G., Alioli, S., Alipour Tehrani, N., Allanach, B. C., Allport, P. P., Altinli, M., Altmannshofer, W., Ambrosio, G., Amorim, D., Amstutz, O., Anderlini, L., Andreazza, A., Andreini, M., Andriatis, A., Andris, C., Andronic, A., Angelucci, M., Antinori, F., Antipov, S. A., Antonelli, M., Antonello, M., Antonioli, P., Antusch, S., Anulli, F., Apolinario, L., Apollinari, G., Apollonio, A., Appelo, D., Appleby, R. B., Apyan, A., Arbey, A., Arbuzov, A., Arduini, G., Ari, V., Arias, S., Armesto, N., Arnaldi, R., Arsenyev, S. A., Arzeo, M., Asai, S., Aslanides, E., Assmann, R. W., Astapovych, D., Atanasov, M., Atieh, S., Attie, D., Auchmann, B., Audurier, A., Aull, S., Aumon, S., Aune, S., Avino, F., Avrillaud, G., Aydin, G., Azatov, A., Azuelos, G., Azzi, P., Azzolini, O., Azzurri, P., Bacchetta, N., Bacchiocchi, E., Bachacou, H., Baek, Y. W., Baglin, V., Bai, Y., Baird, S., Baker, M. J., Baldwin, M. J., Ball, A. H., Ballarino, A., Banerjee, S., Barber, D. 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S., Etisken, O., Etzion, E., Fabbricatore, P., Falkowski, A., Falou, A., Faltova, J., Fan, J., Fano, L., Farilla, A., Farinelli, R., Farinon, S., Faroughy, D. A., Fartoukh, S. D., Faus-Golfe, A., Fawcett, W. J., Felici, G., Felsberger, L., Ferdeghini, C., Fernandez Navarro, A. M., Fernandez-Tellez, A., Ferradas Troitino, J., Ferrara, G., Ferrari, R., Ferreira, L., Ferreira da Silva, P., Ferrera, G., Ferro, F., Fiascaris, M., Fiorendi, S., Fiorio, C., Fischer, O., Fischer, E., Flieger, W., Florio, M., Fonnesu, D., Fontanesi, E., Foppiani, N., Foraz, K., Forkel-Wirth, D., Forte, S., Fouaidy, M., Fournier, D., Fowler, T., Fox, J., Francavilla, P., Franceschini, R., Franchino, S., Franco, E., Freitas, A., Fuks, B., Furukawa, K., Furuseth, S. V., Gabrielli, E., Gaddi, A., Galanti, M., Gallo, E., Ganjour, S., Gao, J., Garcia Diaz, V., Garcia Perez, M., Garcia Tabares, L., Garion, C., Garzelli, M. V., Garzia, I., Gascon-Shotkin, S. M., Gaudio, G., Gay, P., Ge, S. -F., Gehrmann, T., Genest, M. H., Gerard, R., Gerigk, F., Gerwig, H., Giacomelli, P., Giagu, S., Gianfelice-Wendt, E., Gianotti, F., Giffoni, F., Gilardoni, S. S., Gil Costa, M., Giovannetti, M., Giovannozzi, M., Giubellino, P., Giudice, G. F., Giunta, A., Gladilin, L. K., Glukhov, S., Gluza, J., Gobbi, G., Goddard, B., Goertz, F., Golling, T., Goncalves, V. P., Goncalo, R., Gonzalez Gomez, L. A., Gorgi Zadeh, S., Gorine, G., Gorini, E., Gourlay, S. A., Gouskos, L., Grancagnolo, F., Grassellino, A., Grau, A., Graverini, E., Gray, H. M., Greco, M., Grenard, J. -L., Grimm, O., Grojean, C., Gromov, V. A., Grosse-Oetringhaus, J. F., Grudiev, A., Grzanka, K., Gu, J., Guadagnoli, D., Guidi, V., Guiducci, S., Guillermo Canton, G., Gunaydin, Y. O., Gupta, R., Gupta, R. S., Gutierrez, J., Gutleber, J., Guyot, C., Guzey, V., Gwenlan, C., Haberstroh, C., Hacisahinoglu, B., Haerer, B., Hahn, K., Hahn, T., Hammad, A., Han, C., Hance, M., Hannah, A., Harris, P. C., Hati, C., Haug, S., Hauptman, J., Haurylavets, V., He, H. -J., Hegglin, A., Hegner, B., Heinemann, K., Heinemeyer, S., Helsens, C., Henriques, A., Hernandez, P., Hernandez-Pinto, R. J., Hernandez-Sanchez, J., Herzig, T., Hiekkanen, I., Hillert, W., Hoehn, T., Hofer, M., Hofle, W., Holdener, F., Holleis, S., Holzer, B., Hong, D. K., Honorato, C. G., Hopkins, S. C., Hrdinka, J., Hug, F., Humann, B., Humer, H., Hurth, T., Hutton, A., Iacobucci, G., Ibarrola, N., Iconomidou-Fayard, L., Ilyina-Brunner, K., Incandela, J., Infantino, A., Ippolito, V., Ishino, M., Islam, R., Ita, H., Ivanovs, A., Iwamoto, S., Iyer, A., Izquierdo Bermudez, S., Jadach, S., Jamin, D. O., Janot, P., Jarry, P., Jeff, A., Jenny, P., Jensen, E., Jensen, M., Jiang, X., Jimenez, J. M., Jones, M. A., Jones, O. R., Jowett, J. M., Jung, S., Kaabi, W., Kado, M., Kahle, K., Kalinovskaya, L., Kalinowski, J., Kamenik, J. F., Kannike, K., Kara, S. O., Karadeniz, H., Karaventzas, V., Karpov, I., Kartal, S., Karyukhin, A., Kashikhin, V., Katharina Behr, J., Kaya, U., Keintzel, J., Keinz, P. A., Keppel, K., Kersevan, R., Kershaw, K., Khanpour, H., Khatibi, S., Khatiri Yanehsari, M., Khoze, V. V., Kieseler, J., Kilic, A., Kilpinen, A., Kim, Y. -K., Kim, D. W., Klein, U., Klein, M., Kling, F., Klinkenberg, N., Kloppel, S., Klute, M., Klyukhin, V. I., Knecht, M., Kniehl, B., Kocak, F., Koeberl, C., Kolano, A. M., Kollegger, A., Kolodziej, K., Kolomiets, A. A., Komppula, J., Koop, I., Koppenburg, P., Koratzinos, M., Kordiaczynska, M., Korjik, M., Kortner, O., Kostka, P., Kotlarski, W., Kotnig, C., Kottig, T., Kotwal, A. V., Kovalenko, A. D., Kowalski, S., Kozaczuk, J., Kozlov, G. A., Kozub, S. S., Krainer, A. M., Kramer, T., Kramer, M., Krammer, M., Krasnov, A. A., Krauss, F., Kravalis, K., Kretzschmar, L., Kriske, R. 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A., Okumura, Y., Oleari, C., Olness, F. I., Onel, Y., Ortino, M., Osborne, J., Osland, P., Otto, T., Oyulmaz, K. Y., Ozansoy, A., Ozcan, V., Ozdemir, K., Pagliarone, C. E., Pais da Silva, H. F., Palmieri, E., Palumbo, L., Pampaloni, A., Pan, R. -Q., Panareo, M., Panella, O., Panico, G., Panizzo, G., Pankov, A. A., Pantsyrny, V., Papadopoulos, C. G., Papaefstathiou, A., Papaphilippou, Y., Parker, M. A., Parma, V., Pasquali, M., Patra, S. K., Patterson, R., Paukkunen, H., Pauss, F., Peggs, S., Penttinen, J. -P., Peon, G., Perepelkin, E. E., Perez, E., Perez, J. C., Perez, G., Perez, F., Perez Codina, E., Perez Morales, J., Perfilov, M., Pernegger, H., Peruzzi, M., Pes, C., Peters, K., Petracca, S., Petriello, F., Pezzotti, L., Pfeiffer, S., Piccinini, F., Pieloni, T., Pierini, M., Pikhartova, H., Pikurs, G., Pilicer, E., Piminov, P., Pira, C., Pittau, R., Placzek, W., Plagge, M., Plehn, T., Pleier, M. -A., Ploskon, M., Podeur, M., Podlech, H., Podzorny, T., Poggioli, L., Poiron, A., Polesello, G., Poli Lener, M., Polini, A., Polinski, J., Polozov, S. M., Ponce, L., Pont, M., Pontecorvo, L., Portaluri, T., Potamianos, K., Prasse, C., Prausa, M., Preinerstorfer, A., Premat, E., Price, T., Primavera, M., Prino, F., Prioli, M., Proudfoot, J., Provino, A., Pugnat, T., Pukhaeva, N., Pulawski, S., Pulikowski, D., Punzi, G., Putti, M., Pyarelal, A., Quack, H., Quispe, M., Racioppi, A., Rafique, H., Raginel, V., Raidal, M., Ramirez-Uribe, N. S., Ramsey-Musolf, M. J., Rata, R., Ratoff, P., Ravotti, F., Rebello Teles, P., Reboud, M., Redaelli, S., Renner, E., Renteria-Olivo, A. E., Rescigno, M., Reuter, J., Ribon, A., Ricci, A. M., Riegler, W., Riemann, S., Riemann, B., Riemann, T., Rifflet, J. M., Rimmer, R. A., Rinaldesi, R., Rinolfi, L., Rios Rubiras, O., Risselada, T., Rivetti, A., Rivkin, L., Rizzo, T., Robens, T., Robert, F., Robson, A. J., Rochepault, E., Roda, C., Rodrigo, G., Rodriguez-Cahuantzi, M., Rogan, C., Roig, M., Rojas-Torres, S., Rojo, J., Rolandi, G., Rolando, G., Roloff, P., Romanenko, A., Romanov, A., Roncarolo, F., Rosado Sanchez, A., Rosaz, G., Rossi, L., Rossi, A., Rossmanith, R., Rousset, B., Royon, C., Ruan, X., Ruehl, I., Ruhlmann-Kleider, V., Ruiz, R., Rumyantsev, L., Ruprecht, R., Ryazanov, A. I., Saba, A., Sadykov, R., Saez de Jauregui, D., Sahin, M., Sailer, B., Saito, M., Sala, F., Salam, G. P., Salfeld-Nebgen, J., Salgado, C. A., Salini, S., Sallese, J. M., Salmi, T., Salzburger, A., Sampayo, O. A., Sanfilippo, S., Santiago, J., Santopinto, E., Santoro, R., Sanz Ull, A., Sarasola, X., Sarpun, I. H., Sauvain, M., Savelyeva, S., Sawada, R., Sborlini, G. F. R., Schaffer, A., Schaumann, M., Schenk, M., Scheuerlein, C., Schienbein, I., Schlenga, K., Schmickler, H., Schmidt, R., Schoerling, D., Schoning, A., Schorner-Sadenius, T., Schott, M., Schulte, D., Schwaller, P., Schwanenberger, C., Schwemling, P., Schwerg, N., Scibile, L., Sciuto, A., Scomparin, E., Sebastiani, C., Seeber, B., Segreti, M., Selva, P., Selvaggi, M., Senatore, C., Senol, A., Serin, L., Serluca, M., Serra, N., Seryi, A., Sestini, L., Sfyrla, A., Shaposhnikov, M., Shaposhnikova, E., Sharkov, B. Y., Shatilov, D., Shelton, J., Shiltsev, V., Shipsey, I. P., Shirkov, G. D., Shivaji, A., Shwartz, D., Sian, T., Sidorov, S., Siemko, A., Silvestrini, L., Simand, N., Simon, F., Singh, B. 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Zurita, J, Işık Üniversitesi, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü, Işık University, Faculty of Engineering, Department of Civil Engineering, Bayındır, Cihan, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Abada A., Abbrescia M., AbdusSalam S.S., Abdyukhanov I., Abelleira Fernandez J., Abramov A., Aburaia M., Acar A.O., Adzic P.R., Agrawal P., Aguilar-Saavedra J.A., Aguilera-Verdugo J.J., Aiba M., Aichinger I., Aielli G., Akay A., Akhundov A., Aksakal H., Albacete J.L., Albergo S., Alekou A., Aleksa M., Aleksan R., Alemany Fernandez R.M., Alexahin Y., Alia R.G., Alioli S., Alipour Tehrani N., Allanach B.C., Allport P.P., Altinli M., Altmannshofer W., Ambrosio G., Amorim D., Amstutz O., Anderlini L., Andreazza A., Andreini M., Andriatis A., Andris C., Andronic A., Angelucci M., Antinori F., Antipov S.A., Antonelli M., Antonello M., Antonioli P., Antusch S., Anulli F., Apolinario L., Apollinari G., Apollonio A., Appelo D., Appleby R.B., Apyan A., Arbey A., Arbuzov A., Arduini G., Ari V., Arias S., Armesto N., Arnaldi R., Arsenyev S.A., Arzeo M., Asai S., Aslanides E., Assmann R.W., Astapovych D., Atanasov M., Atieh S., Attie D., Auchmann B., Audurier A., Aull S., Aumon S., Aune S., Avino F., Avrillaud G., Aydin G., Azatov A., Azuelos G., Azzi P., Azzolini O., Azzurri P., Bacchetta N., Bacchiocchi E., Bachacou H., Baek Y.W., Baglin V., Bai Y., Baird S., Baker M.J., Baldwin M.J., Ball A.H., Ballarino A., Banerjee S., Barber D.P., Barducci D., Barjhoux P., Barna D., Barnafoldi G.G., Barnes M.J., Barr A., Barranco Garcia J., Barreiro Guimaraes da Costa J., Bartmann W., Baryshevsky V., Barzi E., Bass S.A., Bastianin A., Baudouy B., Bauer F., Bauer M., Baumgartner T., Bautista-Guzman I., Bayindir C., Beaudette F., Bedeschi F., Beguin M., Bellafont I., Bellagamba L., Bellegarde N., Belli E., Bellingeri E., Bellini F., Bellomo G., Belomestnykh S., Bencivenni G., Benedikt M., Bernardi G., Bernardi J., Bernet C., Bernhardt J.M., Bernini C., Berriaud C., Bertarelli A., Bertolucci S., Besana M.I., Besancon M., Beznosov O., Bhat P., Bhat C., Biagini M.E., Biarrotte J.-L., Bibet Chevalier A., Bielert E.R., Biglietti M., Bilei G.M., Bilki B., Biscari C., Bishara F., Blanco-Garcia O.R., Blanquez F.R., Blekman F., Blondel A., Blumlein J., Boccali T., Boels R., Bogacz S.A., Bogomyagkov A., Boine-Frankenheim O., Boland M.J., Bologna S., Bolukbasi O., Bomben M., Bondarenko S., Bonvini M., Boos E., Bordini B., Bordry F., Borghello G., Borgonovi L., Borowka S., Bortoletto D., Boscherini D., Boscolo M., Boselli S., Bosley R.R., Bossu F., Botta C., Bottura L., Boughezal R., Boutin D., Bovone G., Bozovic Jelisavic I., Bozbey A., Bozzi C., Bozzini D., Braccini V., Braibant-Giacomelli S., Bramante J., Braun-Munzinger P., Briffa J.A., Britzger D., Brodsky S.J., Brooke J.J., Bruce R., Bruckman De Renstrom P., Bruna E., Bruning O., Brunner O., Brunner K., Bruzzone P., Buffat X., Bulyak E., Burkart F., Burkhardt H., Burnet J.-P., Butin F., Buttazzo D., Butterworth A., Caccia M., Cai Y., Caiffi B., Cairo V., Cakir O., Calaga R., Calatroni S., Calderini G., Calderola G., Caliskan A., Calvet D., Calviani M., Camalich J.M., Camarri P., Campanelli M., Camporesi T., Canbay A.C., Canepa A., Cantergiani E., Cantore-Cavalli D., Capeans M., Cardarelli R., Cardella U., Cardini A., Carloni Calame C.M., Carra F., Carra S., Carvalho A., Casalbuoni S., Casas J., Cascella M., Castelnovo P., Castorina G., Catalano G., Cavasinni V., Cazzato E., Cennini E., Cerri A., Cerutti F., Cervantes J., Chaikovska I., Chakrabortty J., Chala M., Chamizo-Llatas M., Chanal H., Chanal D., Chance S., Chance A., Charitos P., Charles J., Charles T.K., Chattopadhyay S., Chehab R., Chekanov S.V., Chen N., Chernoded A., Chetvertkova V., Chevalier L., Chiarelli G., Chiarello G., Chiesa M., Chiggiato P., Childers J.T., Chmielinska A., Cholakian A., Chomaz P., Chorowski M., Chou W., Chrzaszcz M., Chyhyrynets E., Cibinetto G., Ciftci A.K., Ciftci R., Cimino R., Ciuchini M., Clark P.J., Coadou Y., Cobal M., Coccaro A., Cogan J., Cogneras E., Collamati F., Colldelram C., Collier P., Collot J., Contino R., Conventi F., Cook C.T.A., Cooley L., Corcella G., Cornell A.S., Corral G.H., Correia-Rodrigues H., Costanza F., Costa Pinto P., Couderc F., Coupard J., Craig N., Crespo Garrido I., Crivellin A., Croteau J.F., Crouch M., Cruz Alaniz E., Cure B., Curti J., Curtin D., Czech M., Dachauer C., D'Agnolo R.T., Daibo M., Dainese A., Dalena B., Daljevec A., Dallapiazza W., D'Aloia Schwartzentruber L., Dam M., D'Ambrosio G., Das S.P., DasBakshi S., da Silva W., da Silveira G.G., D'Auria V., D'Auria S., David A., Davidek T., Deandrea A., de Blas J., Debono C.J., De Curtis S., De Filippis N., de Florian D., Deghaye S., de Jong S.J., Del Bo C., Del Duca V., Delikaris D., Deliot F., Dell'Acqua A., Delle Rose L., Delmastro M., De Lucia E., Demarteau M., Denegri D., Deniau L., Denisov D., Denizli H., Denner A., d'Enterria D., de Rijk G., De Roeck A., Derue F., Deschamps O., Descotes-Genon S., Dev P.S.B., de Vivie de Regie J.B., Dewanjee R.K., Di Ciaccio A., Di Cicco A., Dillon B.M., Di Micco B., Di Nezza P., Di Vita S., Doblhammer A., Dominjon A., D'Onofrio M., Dordei F., Drago A., Draper P., Drasal Z., Drewes M., Duarte L., Dubovyk I., Duda P., Dudarev A., Dudko L., Duellmann D., Dunser M., du Pree T., Durante M., Duran Yildiz H., Dutta S., Duval F., Duval J.M., Dydyshka Y., Dziewit B., Eisenhardt S., Eisterer M., Ekelof T., El Khechen D., Ellis S.A., Ellis J., Ellison J.A., Elsener K., Elsing M., Enari Y., Englert C., Eriksson H., Eskola K.J., Esposito L.S., Etisken O., Etzion E., Fabbricatore P., Falkowski A., Falou A., Faltova J., Fan J., Fano L., Farilla A., Farinelli R., Farinon S., Faroughy D.A., Fartoukh S.D., Faus-Golfe A., Fawcett W.J., Felici G., Felsberger L., Ferdeghini C., Fernandez Navarro A.M., Fernandez-Tellez A., Ferradas Troitino J., Ferrara G., Ferrari R., Ferreira L., Ferreira da Silva P., Ferrera G., Ferro F., Fiascaris M., Fiorendi S., Fiorio C., Fischer O., Fischer E., Flieger W., Florio M., Fonnesu D., Fontanesi E., Foppiani N., Foraz K., Forkel-Wirth D., Forte S., Fouaidy M., Fournier D., Fowler T., Fox J., Francavilla P., Franceschini R., Franchino S., Franco E., Freitas A., Fuks B., Furukawa K., Furuseth S.V., Gabrielli E., Gaddi A., Galanti M., Gallo E., Ganjour S., Gao J., Garcia Diaz V., Garcia Perez M., Garcia Tabares L., Garion C., Garzelli M.V., Garzia I., Gascon-Shotkin S.M., Gaudio G., Gay P., Ge S.-F., Gehrmann T., Genest M.H., Gerard R., Gerigk F., Gerwig H., Giacomelli P., Giagu S., Gianfelice-Wendt E., Gianotti F., Giffoni F., Gilardoni S.S., Gil Costa M., Giovannetti M., Giovannozzi M., Giubellino P., Giudice G.F., Giunta A., Gladilin L.K., Glukhov S., Gluza J., Gobbi G., Goddard B., Goertz F., Golling T., Goncalves V.P., Goncalo R., Gonzalez Gomez L.A., Gorgi Zadeh S., Gorine G., Gorini E., Gourlay S.A., Gouskos L., Grancagnolo F., Grassellino A., Grau A., Graverini E., Gray H.M., Greco M., Grenard J.-L., Grimm O., Grojean C., Gromov V.A., Grosse-Oetringhaus J.F., Grudiev A., Grzanka K., Gu J., Guadagnoli D., Guidi V., Guiducci S., Guillermo Canton G., Gunaydin Y.O., Gupta R., Gupta R.S., Gutierrez J., Gutleber J., Guyot C., Guzey V., Gwenlan C., Haberstroh C., Hacisahinoglu B., Haerer B., Hahn K., Hahn T., Hammad A., Han C., Hance M., Hannah A., Harris P.C., Hati C., Haug S., Hauptman J., Haurylavets V., He H.-J., Hegglin A., Hegner B., Heinemann K., Heinemeyer S., Helsens C., Henriques A., Hernandez P., Hernandez-Pinto R.J., Hernandez-Sanchez J., Herzig T., Hiekkanen I., Hillert W., Hoehn T., Hofer M., Hofle W., Holdener F., Holleis S., Holzer B., Hong D.K., Honorato C.G., Hopkins S.C., Hrdinka J., Hug F., Humann B., Humer H., Hurth T., Hutton A., Iacobucci G., Ibarrola N., Iconomidou-Fayard L., Ilyina-Brunner K., Incandela J., Infantino A., Ippolito V., Ishino M., Islam R., Ita H., Ivanovs A., Iwamoto S., Iyer A., Izquierdo Bermudez S., Jadach S., Jamin D.O., Janot P., Jarry P., Jeff A., Jenny P., Jensen E., Jensen M., Jiang X., Jimenez J.M., Jones M.A., Jones O.R., Jowett J.M., Jung S., Kaabi W., Kado M., Kahle K., Kalinovskaya L., Kalinowski J., Kamenik J.F., Kannike K., Kara S.O., Karadeniz H., Karaventzas V., Karpov I., Kartal S., Karyukhin A., Kashikhin V., Katharina Behr J., Kaya U., Keintzel J., Keinz P.A., Keppel K., Kersevan R., Kershaw K., Khanpour H., Khatibi S., Khatiri Yanehsari M., Khoze V.V., Kieseler J., Kilic A., Kilpinen A., Kim Y.-K., Kim D.W., Klein U., Klein M., Kling F., Klinkenberg N., Kloppel S., Klute M., Klyukhin V.I., Knecht M., Kniehl B., Kocak F., Koeberl C., Kolano A.M., Kollegger A., Kolodziej K., Kolomiets A.A., Komppula J., Koop I., Koppenburg P., Koratzinos M., Kordiaczynska M., Korjik M., Kortner O., Kostka P., Kotlarski W., Kotnig C., Kottig T., Kotwal A.V., Kovalenko A.D., Kowalski S., Kozaczuk J., Kozlov G.A., Kozub S.S., Krainer A.M., Kramer T., Kramer M., Krammer M., Krasnov A.A., Krauss F., Kravalis K., Kretzschmar L., Kriske R.M., Kritscher H., Krkotic P., Kroha H., Kucharczyk M., Kuday S., Kuendig A., Kuhlmann G., Kulesza A., Kumar M., Kusina A., Kuttimalai S., Kuze M., Kwon T., Lackner F., Lackner M., La Francesca E., Laine M., Lamanna G., La Mendola S., Lancon E., Landsberg G., Langacker P., Lange C., Langner A., Lankford A.J., Lansberg J.P., Lari T., Laycock P.J., Lebrun P., Lechner A., Lee K., Lee S., Lee R., Lefevre T., Le Guen P., Lehtinen T., Leith S.B., Lenzi P., Leogrande E., Leonidopoulos C., Leon-Monzon I., Lerner G., Leroy O., Lesiak T., Levai P., Leveratto A., Levichev E., Li G., Li S., Li R., Liberati D., Liepe M., Lissauer D.A., Liu Z., Lobko A., Locci E., Logothetis Agaliotis E., Lombardo M.P., Long A.J., Lorin C., Losito R., Louzguiti A., Low I., Lucchesi D., Lucchini M.T., Luciani A., Lueckhof M., Lunt A.J.G., Luzum M., Lyubimtsev D.A., Maggiora M., Magnin N., Mahmoud M.A., Mahmoudi F., Maitre J., Makarenko V., Malagoli A., Malcles J., Malgeri L., Mallon P.J., Maltoni F., Malvezzi S., Malyshev O.B., Mancinelli G., Mandrik P., Manfrinetti P., Mangano M., Manil P., Mannelli M., Marchiori G., Marhauser F., Mariani V., Marinozzi V., Mariotto S., Marquard P., Marquet C., Marriott-Dodington T., Martin R., Martin O., Martin Camalich J., Martinez T., Martinez Bruzual H., Martinez-Hernandez M.I., Martins D.E., Marzani S., Marzocca D., Marzola L., Masciocchi S., Masina I., Massimiliano A., Massironi A., Masubuchi T., Matveev V.A., Mazzoni M.A., McCullough M., McIntosh P.A., Meade P., Medina L., Meier A., Meignan J., Mele B., Mendes Saraiva J.G., Menez F., Mentink M., Meoni E., Meridiani P., Merk M., Mermod P., Mertens V., Mether L., Metral E., Migliorati M., Milanese A., Milardi C., Milhano G., Militsyn B.L., Millet F., Minashvili I., Minervini J.V., Miralles L.S., Mirarchi D., Mishima S., Missiaen D.P., Mitselmakher G., Mitshuhashi T., Mnich J., Mohammadi Najafabadi M., Mohapatra R.N., Mokhov N., Molson J.G., Monge R., Montag C., Montagna G., Monteil S., Montenero G., Montesinos E., Moortgat F., Morange N., Morello G., Moreno Llacer M., Moretti M., Moretti S., Morley A.K., Moros A., Morozov I., Morretta V., Morrone M., Mostacci A., Muanza S., Muchnoi N., Muhlegger M., Mulder M., Mulders M., Muller B., Muller F., Muller A.-S., Munilla J., Murray M.J., Muttoni Y., Myers S., Mylona M., Nachtman J., Nakamoto T., Nardecchia M., Nardini G., Nason P., Nergiz Z., Nesterenko A.V., Netto J.A., Nettstrater A., Neubuser C., Neundorf J., Niccoli F., Nicrosini O., Nie Y., Niedermayer U., Niedziela J., Niemi A., Nikitin S.A., Nisati A., No J.M., Nonis M., Nosochkov Y., Novak M., Novokhatski A., O'Callaghan J.M., Ochando C., Ogur S., Ohmi K., Oide K., Okorokov V.A., Okumura Y., Oleari C., Olness F.I., Onel Y., Ortino M., Osborne J., Osland P., Otto T., Oyulmaz K.Y., Ozansoy A., Ozcan V., Ozdemir K., Pagliarone C.E., Pais da Silva H.F., Palmieri E., Palumbo L., Pampaloni A., Pan R.-Q., Panareo M., Panella O., Panico G., Panizzo G., Pankov A.A., Pantsyrny V., Papadopoulos C.G., Papaefstathiou A., Papaphilippou Y., Parker M.A., Parma V., Pasquali M., Patra S.K., Patterson R., Paukkunen H., Pauss F., Peggs S., Penttinen J.-P., Peon G., Perepelkin E.E., Perez E., Perez J.C., Perez G., Perez F., Perez Codina E., Perez Morales J., Perfilov M., Pernegger H., Peruzzi M., Pes C., Peters K., Petracca S., Petriello F., Pezzotti L., Pfeiffer S., Piccinini F., Pieloni T., Pierini M., Pikhartova H., Pikurs G., Pilicer E., Piminov P., Pira C., Pittau R., Placzek W., Plagge M., Plehn T., Pleier M.-A., Ploskon M., Podeur M., Podlech H., Podzorny T., Poggioli L., Poiron A., Polesello G., Poli Lener M., Polini A., Polinski J., Polozov S.M., Ponce L., Pont M., Pontecorvo L., Portaluri T., Potamianos K., Prasse C., Prausa M., Preinerstorfer A., Premat E., Price T., Primavera M., Prino F., Prioli M., Proudfoot J., Provino A., Pugnat T., Pukhaeva N., Pulawski S., Pulikowski D., Punzi G., Putti M., Pyarelal A., Quack H., Quispe M., Racioppi A., Rafique H., Raginel V., Raidal M., Ramirez-Uribe N.S., Ramsey-Musolf M.J., Rata R., Ratoff P., Ravotti F., Rebello Teles P., Reboud M., Redaelli S., Renner E., Renteria-Olivo A.E., Rescigno M., Reuter J., Ribon A., Ricci A.M., Riegler W., Riemann S., Riemann B., Riemann T., Rifflet J.M., Rimmer R.A., Rinaldesi R., Rinolfi L., Rios Rubiras O., Risselada T., Rivetti A., Rivkin L., Rizzo T., Robens T., Robert F., Robson A.J., Rochepault E., Roda C., Rodrigo G., Rodriguez-Cahuantzi M., Rogan C., Roig M., Rojas-Torres S., Rojo J., Rolandi G., Rolando G., Roloff P., Romanenko A., Romanov A., Roncarolo F., Rosado Sanchez A., Rosaz G., Rossi L., Rossi A., Rossmanith R., Rousset B., Royon C., Ruan X., Ruehl I., Ruhlmann-Kleider V., Ruiz R., Rumyantsev L., Ruprecht R., Ryazanov A.I., Saba A., Sadykov R., Saez de Jauregui D., Sahin M., Sailer B., Saito M., Sala F., Salam G.P., Salfeld-Nebgen J., Salgado C.A., Salini S., Sallese J.M., Salmi T., Salzburger A., Sampayo O.A., Sanfilippo S., Santiago J., Santopinto E., Santoro R., Sanz Ull A., Sarasola X., Sarpun I.H., Sauvain M., Savelyeva S., Sawada R., Sborlini G.F.R., Schaffer A., Schaumann M., Schenk M., Scheuerlein C., Schienbein I., Schlenga K., Schmickler H., Schmidt R., Schoerling D., Schoning A., Schorner-Sadenius T., Schott M., Schulte D., Schwaller P., Schwanenberger C., Schwemling P., Schwerg N., Scibile L., Sciuto A., Scomparin E., Sebastiani C., Seeber B., Segreti M., Selva P., Selvaggi M., Senatore C., Senol A., Serin L., Serluca M., Serra N., Seryi A., Sestini L., Sfyrla A., Shaposhnikov M., Shaposhnikova E., Sharkov B.Y., Shatilov D., Shelton J., Shiltsev V., Shipsey I.P., Shirkov G.D., Shivaji A., Shwartz D., Sian T., Sidorov S., Siemko A., Silvestrini L., Simand N., Simon F., Singh B.K., Siodmok A., Sirois Y., Sirtori E., Sirvinskaite R., Sitar B., Sjostrand T., Skands P., Skordis E., Skovpen K., Skrzypek M., Slade E., Slavich P., Slovak R., Smaluk V., Smirnov V., Snoeys W., Soffi L., Sollander P., Solovyanov O., Soltveit H.K., Song H., Sopicki P., Sorbi M., Spallino L., Spannowsky M., Spataro B., Sphicas P., Spiesberger H., Spiller P., Spira M., Srivastava T., Stachel J., Stakia A., Stanyard J.L., Starchenko E., Starikov A.Y., Stasto A.M., Statera M., Steerenberg R., Steggemann J., Stenvall A., Stivanello F., Stockinger D., Stoel L.S., Stoger-Pollach M., Strauss B., Stuart M., Stupakov G., Su S., Sublet A., Sugita K., Sulak L., Sullivan M.K., Sultansoy S., Sumida T., Suzuki K., Sylva G., Syphers M.J., Sznajder A., Taborelli M., Tahir N.A., Takeuchi M., Tal Hod E., Tambasco C., Tanaka J., Tang K., Tapan I., Taroni S., Tartarelli G.F., Tassielli G., Tavian L., Taylor T.M., Taylor G.N., Teixeira A.M., Tejeda-Munoz G., Telnov V.I., Tenchini R., ten Kate H.H.J., Terashi K., Tesi A., Testa M., Tetrel C., Teytelman D., Thaler J., Thamm A., Thomas S., Tiirakari M.T., Tikhomirov V., Tikhonov D., Timko H., Tisserand V., Tkachenko L.M., Tkaczuk J., Tock J.P., Todd B., Todesco E., Tomas Garcia R., Tommasini D., Tonelli G., Toral F., Torims T., Torre R., Townsend Z., Trant R., Treille D., Trentadue L., Tricoli A., Tricomi A., Trischuk W., Tropin I.S., Tuchming B., Tudora A.A., Turbiarz B., Turk Cakir I., Turri M., Tydecks T., Usovitsch J., Uythoven J., Vaglio R., Valassi A., Valchkova F., Valdivia Garcia M.A., Valente P., Valente R.U., Valente-Feliciano A.-M., Valentino G., Vale Silva L., Valet J.M., Valizadeh R., Valle J.W.F., Vallecorsa S., Vallone G., van Leeuwen M., van Rienen U.H., van Riesen-Haupt L., Varasteh M., Vecchi L., Vedrine P., Velev G., Veness R., Ventura A., Venturini Delsolaro W., Verducci M., Verhaaren C.B., Vernieri C., Verweij A.P., Verwilligen O., Viazlo O., Vicini A., Viehhauser G., Vignaroli N., Vignolo M., Vitrano A., Vivarelli I., Vlachos S., Vogel M., Vogt D.M., Volkl V., Volkov P., Volpini G., von Ahnen J., Vorotnikov G., Voutsinas G.G., Vysotsky V., Wagner U., Wallny R., Wang L.-T., Wang R., Wang K., Ward B.F.L., Watson T.P., Watson N.K., Ws Z., Weiland C., Weinzierl S., Welsch C.P., Wenninger J., Widorski M., Wiedemann U.A., Wienands H.-U., Wilkinson G., Williams P.H., Winter A., Wohlfahrt A., Wojton T., Wollmann D., Womersley J., Woog D., Wu X., Wulzer A., Yanehsari M.K., Yang G., Yang H.J., Yao W.-M., Yazgan E., Yermolchik V., Yilmaz A., Yoo H.-D., Yost S.A., You T., Young C., Yu T.-T., Yu F., Zaborowska A., Zadeh S.G., Zahnd M., Zanetti M., Zanotto L., Zawiejski L., Zeiler P., Zerlauth M., Zernov S.M., Zevi Dell Porta G., Zhang Z., Zhang Y., Zhang C., Zhang H., Zhao Z., Zhong Y.-M., Zhou J., Zhou D., Zhuang P., Zick G., Zimmermann F., Zinn-Justin J., Zivkovic L., Zlobin A.V., Zobov M., Zupan J., Zurita J., BAİBÜ, Fen Edebiyat Fakültesi, Fizik Bölümü, Denizli, Haluk, TOBB ETU, Faculty of Engineering, Department of Electrical & Electronics Engineering, TOBB ETU, Faculty of Engineering, Department of Material Science & Nanotechnology Engineering, TOBB ETÜ, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, TOBB ETÜ, Mühendislik Fakültesi, Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü, Bozbey, Ali, Sultansoy, Saleh, Özdemir, Kadri, Giresun Üniversitesi, UCL - SST/IRMP - Institut de recherche en mathématique et physique, and Ege Üniversitesi
Subjects: Beam losses, IMPACT, Physics::Instrumentation and Detectors, Physics beyond the Standard Model, EVENT BUILDER, hadron collider, General Physics and Astronomy, Mathematics and natural science: 400::Physics: 430::Nuclear and elementary particle physics: 431 [VDP], 01 natural sciences, 7. Clean energy, law.invention, Subatomär fysik, chemistry.chemical_compound, Conceptual design, Colliding beam accelerators, law, HE-LHC, Subatomic Physics, General Materials Science, Hadron colliders, Física::Física de partícules::Hadrons [Àrees temàtiques de la UPC], Large Hadron Collider, Acceleradors de partícules, Physics, Settore FIS/01 - Fisica Sperimentale, Beams (radiation), Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici, Upgrade, Impact, collimators, partikkelfysikk, Future Circular Collider, High-Energy, Systems engineering, HE-LHC: The High-Energy Large Hadron Collider, Col·lisionadors d'hadrons, Applied physics, Collimators, Socio-culturale, Fizik, Hadrons, Accelerator Physics and Instrumentation, HE-LHC physics, Condensed Matter::Materials Science, 0103 physical sciences, Physics::Atomic and Molecular Clusters, beam losses, ddc:530, High Energy Physics, partikkelakselerator, Physical and Theoretical Chemistry, Niobium-tin, 010306 general physics, Collider, Particle Physics, Beams (radiation) | Collimators | Beam losses, Energies::Energia nuclear [Àrees temàtiques de la UPC], Large Hadron Collider HE-LHC, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Colliders (Nuclear physics), Acceleratorfysik och instrumentering, Event builder, Accelerators and Storage Rings, Particle accelerators, chemistry, Experimental High Energy Physics, Physics::Accelerator Physics, High Energy Physics::Experiment, Future Colliders
Abstract: Authors: A. AbadaM. AbbresciaS. S. AbdusSalamI. AbdyukhanovJ. Abelleira FernandezA. AbramovM. AburaiaA. O. AcarP. R. AdzicP. AgrawalJ. A. Aguilar-SaavedraJ. J. Aguilera-VerdugoM. AibaI. AichingerG. AielliA. AkayA. AkhundovH. AksakalJ. L. AlbaceteS. AlbergoA. AlekouM. AleksaR. AleksanR. M. Alemany FernandezY. AlexahinR. G. AlíaS. AlioliN. Alipour TehraniB. C. AllanachP. P. AllportM. AltınlıW. AltmannshoferG. AmbrosioD. AmorimO. AmstutzL. AnderliniA. AndreazzaM. AndreiniA. AndriatisC. AndrisA. AndronicM. AngelucciF. AntinoriS. A. AntipovM. AntonelliM. AntonelloP. AntonioliS. AntuschF. AnulliL. ApolinárioG. ApollinariA. ApollonioD. AppelöR. B. ApplebyA. ApyanA. ApyanA. ArbeyA. ArbuzovG. ArduiniV. ArıS. AriasN. ArmestoR. ArnaldiS. A. ArsenyevM. ArzeoS. AsaiE. AslanidesR. W. AßmannD. AstapovychM. AtanasovS. AtiehD. AttiéB. AuchmannA. AudurierS. AullS. AumonS. AuneF. AvinoG. AvrillaudG. AydınA. AzatovG. AzuelosP. AzziO. AzzoliniP. AzzurriN. BacchettaE. BacchiocchiH. BachacouY. W. BaekV. BaglinY. BaiS. BairdM. J. BakerM. J. BaldwinA. H. BallA. BallarinoS. BanerjeeD. P. BarberD. BarducciP. BarjhouxD. BarnaG. G. BarnaföldiM. J. BarnesA. BarrJ. Barranco GarcíaJ. Barreiro Guimarães da CostaW. BartmannV. BaryshevskyE. BarziS. A. BassA. BastianinB. BaudouyF. BauerM. BauerT. BaumgartnerI. Bautista-GuzmánC. BayındırF. BeaudetteF. BedeschiM. BéguinI. BellafontL. BellagambaN. BellegardeE. BelliE. BellingeriF. BelliniG. BellomoS. BelomestnykhG. BencivenniM. BenediktG. BernardiJ. BernardiC. BernetJ. M. BernhardtC. BerniniC. BerriaudA. BertarelliS. BertolucciM. I. BesanaM. BesançonO. BeznosovP. BhatC. BhatM. E. BiaginiJ. -L. BiarrotteA. Bibet ChevalierE. R. BielertM. BigliettiG. M. BileiB. BilkiC. BiscariF. BisharaO. R. Blanco-GarcíaF. R. BlánquezF. BlekmanA. BlondelJ. BlümleinT. BoccaliR. BoelsS. A. BogaczA. BogomyagkovO. Boine-FrankenheimM. J. BolandS. BolognaO. BolukbasiM. BombenS. BondarenkoM. BonviniE. BoosB. BordiniF. BordryG. BorghelloL. BorgonoviS. BorowkaD. 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ChattopadhyayR. ChehabS. V. ChekanovN. ChenA. ChernodedV. ChetvertkovaL. ChevalierG. ChiarelliG. ChiarelloM. ChiesaP. ChiggiatoJ. T. ChildersA. ChmielińskaA. CholakianP. ChomazM. ChorowskiW. ChouM. ChrzaszczE. ChyhyrynetsG. CibinettoA. K. CiftciR. CiftciR. CiminoM. CiuchiniP. J. ClarkY. CoadouM. CobalA. CoccaroJ. CoganE. CognerasF. CollamatiC. ColldelramP. CollierJ. CollotR. ContinoF. ConventiC. T. A. CookL. CooleyG. CorcellaA. S. CornellG. H. CorralH. Correia-RodriguesF. CostanzaP. Costa PintoF. CoudercJ. CoupardN. CraigI. Crespo GarridoA. CrivellinJ. F. CroteauM. CrouchE. Cruz AlanizB. CuréJ. CurtiD. CurtinM. CzechC. DachauerR. T. D’AgnoloM. DaiboA. DaineseB. DalenaA. DaljevecW. DallapiazzaL. D’Aloia SchwartzentruberM. DamG. D’AmbrosioS. P. DasS. DasBakshiW. da SilvaG. G. da SilveiraV. D’AuriaS. D’AuriaA. DavidT. DavidekA. DeandreaJ. de BlasC. J. DebonoS. De CurtisN. De FilippisD. de FlorianS. DeghayeS. J. de JongC. Del BoV. Del DucaD. DelikarisF. DeliotA. Dell’AcquaL. Delle RoseM. DelmastroE. De LuciaM. DemarteauD. DenegriL. DeniauD. DenisovH. DenizliA. DennerD. d’EnterriaG. de RijkA. De RoeckF. DerueO. DeschampsS. Descotes-GenonP. S. B. DevJ. B. de Vivie de RégieR. K. DewanjeeA. Di CiaccioA. Di CiccoB. M. DillonB. Di MiccoP. Di NezzaS. Di VitaA. DoblhammerA. DominjonM. D’OnofrioF. DordeiA. DragoP. DraperZ. DrasalM. DrewesL. DuarteI. DubovykP. DudaA. DudarevL. DudkoD. DuellmannM. DünserT. du PreeM. DuranteH. Duran YildizS. DuttaF. DuvalJ. M. DuvalY. DydyshkaB. DziewitS. EisenhardtM. EistererT. EkelofD. El KhechenS. A. EllisJ. EllisJ. A. EllisonK. ElsenerM. ElsingY. EnariC. EnglertH. ErikssonK. J. EskolaL. S. EspositoO. EtiskenE. EtzionP. FabbricatoreA. FalkowskiA. FalouJ. FaltovaJ. FanL. FanòA. FarillaR. FarinelliS. FarinonD. A. FaroughyS. D. FartoukhA. Faus-GolfeW. J. FawcettG. FeliciL. FelsbergerC. FerdeghiniA. M. Fernandez NavarroA. Fernández-TéllezJ. Ferradas TroitinoG. FerraraR. FerrariL. FerreiraP. Ferreira da SilvaG. FerreraF. FerroM. FiascarisS. FiorendiC. FiorioO. FischerE. FischerW. FliegerM. FlorioD. FonnesuE. FontanesiN. FoppianiK. ForazD. Forkel-WirthS. ForteM. FouaidyD. FournierT. FowlerJ. FoxP. FrancavillaR. FranceschiniS. FranchinoE. FrancoA. FreitasB. FuksK. FurukawaS. V. FurusethE. GabrielliA. GaddiM. GalantiE. GalloS. GanjourJ. GaoJ. GaoV. Garcia DiazM. García PérezL. García TabarésC. GarionM. V. GarzelliI. GarziaS. M. Gascon-ShotkinG. GaudioP. GayS. -F. GeT. GehrmannM. H. GenestR. GerardF. GerigkH. GerwigP. GiacomelliS. GiaguE. Gianfelice-WendtF. GianottiF. GiffoniS. S. GilardoniM. Gil CostaM. GiovannettiM. GiovannozziP. GiubellinoG. F. GiudiceA. GiuntaL. K. GladilinS. GlukhovJ. GluzaG. GobbiB. GoddardF. GoertzT. GollingV. P. GoncalvesR. GonçaloL. A. Gonzalez GomezS. Gorgi ZadehG. GorineE. GoriniS. A. GourlayL. GouskosF. GrancagnoloA. GrassellinoA. GrauE. GraveriniH. M. GrayMa. GrecoMi. GrecoJ. -L. GrenardO. GrimmC. GrojeanV. A. GromovJ. F. Grosse-OetringhausA. GrudievK. GrzankaJ. GuD. GuadagnoliV. GuidiS. GuiducciG. Guillermo CantonY. O. GünaydinR. GuptaR. S. GuptaJ. GutierrezJ. GutleberC. GuyotV. GuzeyC. GwenlanC. HaberstrohB. HacışahinoğluB. HaererK. HahnT. HahnA. HammadC. HanM. HanceA. HannahP. C. HarrisC. HatiS. HaugJ. HauptmanV. HaurylavetsH. -J. HeA. HegglinB. HegnerK. HeinemannS. HeinemeyerC. HelsensA. HenriquesA. HenriquesP. HernandezR. J. Hernández-PintoJ. Hernandez-SanchezT. HerzigI. HiekkanenW. HillertT. HoehnM. HoferW. HöfleF. HoldenerS. HolleisB. HolzerD. K. HongC. G. HonoratoS. C. HopkinsJ. HrdinkaF. HugB. HumannH. HumerT. HurthA. HuttonG. IacobucciN. IbarrolaL. Iconomidou-FayardK. Ilyina-BrunnerJ. IncandelaA. InfantinoV. IppolitoM. IshinoR. IslamH. ItaA. IvanovsS. IwamotoA. IyerS. Izquierdo BermudezS. JadachD. O. JaminP. JanotP. JarryA. JeffP. JennyE. JensenM. JensenX. JiangJ. M. JiménezM. A. JonesO. R. JonesJ. M. JowettS. JungW. KaabiM. KadoK. KahleL. KalinovskayaJ. KalinowskiJ. F. KamenikK. KannikeS. O. KaraH. KaradenizV. KaraventzasI. KarpovS. KartalA. KaryukhinV. 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MeoniP. MeridianiM. MerkP. MermodV. MertensL. MetherE. MétralM. MiglioratiA. MilaneseC. MilardiG. MilhanoB. L. MilitsynF. MilletI. MinashviliJ. V. MinerviniL. S. MirallesD. MirarchiS. MishimaD. P. MissiaenG. MitselmakherT. MitshuhashiJ. MnichM. Mohammadi NajafabadiR. N. MohapatraN. MokhovJ. G. MolsonR. MongeC. MontagG. MontagnaS. MonteilG. MonteneroE. MontesinosF. MoortgatN. MorangeG. MorelloM. Moreno LlácerM. MorettiS. MorettiA. K. MorleyA. MorosI. MorozovV. MorrettaM. MorroneA. MostacciS. MuanzaN. MuchnoiM. MühleggerM. MulderM. MuldersB. MüllerF. MüllerA. -S. MüllerJ. MunillaM. J. MurrayY. MuttoniS. MyersM. MylonaJ. NachtmanT. NakamotoM. NardecchiaG. NardiniP. NasonZ. NergizA. V. NesterenkoJ. A. NettoA. NettsträterC. NeubüserJ. NeundorfF. NiccoliO. NicrosiniY. NieU. NiedermayerJ. NiedzielaA. NiemiS. A. NikitinA. NisatiJ. M. NoM. NonisY. NosochkovM. NovákA. NovokhatskiJ. M. O’CallaghanC. OchandoS. OgurK. OhmiK. OideV. A. OkorokovY. OkumuraC. OleariF. I. OlnessY. OnelM. OrtinoJ. OsborneP. OslandT. OttoK. Y. OyulmazA. OzansoyV. ÖzcanK. ÖzdemirC. E. PagliaroneH. F. Pais da SilvaE. PalmieriL. PalumboA. PampaloniR. -Q. PanM. PanareoO. PanellaG. PanicoG. PanizzoA. A. PankovV. PantsyrnyC. G. PapadopoulosA. PapaefstathiouY. PapaphilippouM. A. ParkerV. ParmaM. PasqualiS. K. PatraR. PattersonH. PaukkunenF. PaussS. PeggsJ. -P. PenttinenG. PeónE. E. PerepelkinE. PerezJ. C. PerezG. PerezF. PérezE. Perez CodinaJ. Perez MoralesM. PerfilovH. PerneggerM. PeruzziC. PesK. PetersS. PetraccaF. PetrielloL. PezzottiS. PfeifferF. PiccininiT. PieloniM. PieriniH. PikhartovaG. PikursE. PilicerP. PiminovC. PiraR. PittauW. PłaczekM. PlaggeT. PlehnM. -A. PleierM. PłoskońM. PodeurH. PodlechT. PodzornyL. PoggioliA. PoironG. PoleselloM. Poli LenerA. PoliniJ. PolinskiS. M. PolozovL. PonceM. PontL. PontecorvoT. PortaluriK. PotamianosC. PrasseM. PrausaA. PreinerstorferE. PrematT. PriceM. PrimaveraF. PrinoM. PrioliJ. ProudfootA. ProvinoT. PugnatN. PukhaevaS. PuławskiD. PulikowskiG. PunziM. PuttiA. PyarelalH. QuackM. QuispeA. RacioppiH. RafiqueV. RaginelM. RaidalN. S. Ramírez-UribeM. J. Ramsey-MusolfR. RataP. RatoffF. RavottiP. Rebello TelesM. ReboudS. RedaelliE. RennerA. E. Rentería-OlivoM. RescignoJ. ReuterA. RibonA. M. RicciW. RieglerS. RiemannB. RiemannT. RiemannJ. M. RiffletR. A. RimmerR. RinaldesiL. RinolfiO. Rios RubirasT. RisseladaA. RivettiL. RivkinT. RizzoT. RobensF. RobertA. J. RobsonE. RochepaultC. RodaG. RodrigoM. Rodríguez-CahuantziC. RoganM. RoigS. Rojas-TorresJ. RojoG. RolandiG. RolandoP. RoloffA. RomanenkoA. RomanovF. RoncaroloA. Rosado SanchezG. RosazL. RossiA. RossiR. RossmanithB. RoussetC. RoyonX. RuanI. RuehlV. Ruhlmann-KleiderR. RuizL. RumyantsevR. RuprechtA. I. RyazanovA. SabaR. SadykovD. Saez de JaureguiM. SahinB. SailerM. SaitoF. SalaG. P. SalamJ. Salfeld-NebgenC. A. SalgadoS. SaliniJ. M. SalleseT. SalmiA. SalzburgerO. A. SampayoS. SanfilippoJ. SantiagoE. SantopintoR. SantoroA. Sanz UllX. SarasolaI. H. SarpünM. SauvainS. SavelyevaR. SawadaG. F. R. SborliniA. SchafferM. SchaumannM. SchenkC. ScheuerleinI. SchienbeinK. SchlengaH. SchmicklerR. SchmidtD. SchoerlingA. SchoningT. Schörner-SadeniusM. SchottD. SchulteP. SchwallerC. SchwanenbergerP. SchwemlingN. SchwergL. ScibileA. SciutoE. ScomparinC. SebastianiB. SeeberM. SegretiP. SelvaM. SelvaggiC. SenatoreA. SenolL. SerinM. SerlucaN. SerraA. SeryiL. SestiniA. SfyrlaM. ShaposhnikovE. ShaposhnikovaB. Y. SharkovD. ShatilovJ. SheltonV. ShiltsevI. P. ShipseyG. D. ShirkovA. ShivajiD. ShwartzT. SianS. SidorovA. SiemkoL. SilvestriniN. SimandF. SimonB. K. SinghA. SiódmokY. SiroisE. SirtoriR. SirvinskaiteB. SitarT. SjöstrandP. SkandsE. SkordisK. SkovpenM. SkrzypekE. SladeP. SlavichR. SlovakV. SmalukV. SmirnovW. SnoeysL. SoffiP. SollanderO. SolovyanovH. K. SoltveitH. SongP. SopickiM. SorbiL. SpallinoM. SpannowskyB. SpataroP. SphicasH. SpiesbergerP. SpillerM. SpiraT. SrivastavaJ. StachelA. StakiaJ. L. StanyardE. StarchenkoA. Y. StarikovA. M. StaśtoM. StateraR. SteerenbergJ. SteggemannA. StenvallF. StivanelloD. StöckingerL. S. StoelM. Stöger-PollachB. StraussM. StuartG. StupakovS. SuA. SubletK. SugitaL. SulakM. K. SullivanS. SultansoyT. SumidaK. SuzukiG. SylvaM. J. SyphersA. SznajderM. TaborelliN. A. TahirM. TakeuchiE. Tal HodC. TambascoJ. TanakaK. TangI. TapanS. TaroniG. F. TartarelliG. TassielliL. TavianT. M. TaylorG. N. TaylorA. M. TeixeiraG. Tejeda-MuñozV. I. TelnovR. TenchiniH. H. J. ten KateK. TerashiA. TesiM. TestaC. TetrelD. TeytelmanJ. ThalerA. ThammS. ThomasM. T. TiirakariV. TikhomirovD. TikhonovH. TimkoV. TisserandL. M. TkachenkoJ. TkaczukJ. P. TockB. ToddE. TodescoR. Tomás GarciaD. TommasiniG. TonelliF. ToralT. TorimsR. TorreZ. TownsendR. TrantD. TreilleL. TrentadueA. TricoliA. TricomiW. TrischukI. S. TropinB. TuchmingA. A. TudoraB. TurbiarzI. Turk CakirM. TurriT. TydecksJ. UsovitschJ. UythovenR. VaglioA. ValassiF. ValchkovaM. A. Valdivia GarciaP. ValenteR. U. ValenteA. -M. Valente-FelicianoG. ValentinoL. Vale SilvaJ. M. ValetR. ValizadehJ. W. F. ValleS. VallecorsaG. ValloneM. van LeeuwenU. H. van RienenL. van Riesen-HauptM. VarastehL. VecchiP. VedrineG. VelevR. VenessA. VenturaW. Venturini DelsolaroM. VerducciC. B. VerhaarenC. VernieriA. P. VerweijO. VerwilligenO. ViazloA. ViciniG. ViehhauserN. VignaroliM. VignoloA. VitranoI. VivarelliS. VlachosM. VogelD. M. VogtV. VölklP. VolkovG. VolpiniJ. von AhnenG. VorotnikovG. G. VoutsinasV. VysotskyU. WagnerR. WallnyL. -T. WangR. WangK. WangB. F. L. WardT. P. WatsonN. K. WatsonZ. WsC. WeilandS. WeinzierlC. P. WelschJ. WenningerM. WidorskiU. A. WiedemannH. -U. WienandsG. WilkinsonP. H. WilliamsA. WinterA. WohlfahrtT. WojtońD. WollmannJ. WomersleyD. WoogX. WuA. WulzerM. K. YanehsariG. YangH. J. YangW. -M. YaoE. YazganV. YermolchikA. YilmazA. YilmazH. -D. YooS. A. YostT. YouC. YoungT. -T. YuF. YuA. ZaborowskaS. G. ZadehM. ZahndM. ZanettiL. ZanottoL. ZawiejskiP. ZeilerM. ZerlauthS. M. ZernovG. Zevi Dell PortaZ. ZhangY. ZhangC. ZhangH. ZhangZ. ZhaoY. -M. ZhongJ. ZhouD. ZhouP. ZhuangG. ZickF. ZimmermannEmail authorJ. Zinn-JustinL. ZivkovicA. V. ZlobinM. ZobovJ. ZupanJ. Zuritathe FCC Collaboration, In response to the 2013 Update of the European Strategy for Particle Physics (EPPSU), the Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC study covered an energy-frontier hadron collider (FCC-hh), a highest-luminosity high-energy lepton collider (FCC-ee), the corresponding 100km tunnel infrastructure, as well as the physics opportunities of these two colliders, and a high-energy LHC, based on FCC-hh technology. This document constitutes the fourth volume of the FCC Conceptual Design Report, devoted to the High-Energy Large Hadron Collider HE-LHC. It summarizes the HE-LHC physics discovery opportunities, presents the HE-LHC accelerator design, performance reach, and operation plan, discusses the underlying technologies, the civil engineering and technical infrastructure, and also sketches a possible implementation. Combining ingredients from the Large Hadron Collider (LHC), the high-luminosity LHC upgrade and adding novel technologies and approaches, the HE-LHC design aims at a hadron collider with about twice the centre-of-mass collision energy that the LHC can reach. Its performance aims at exploring physics beyond the Standard Model, signi cantly extending the LHC's direct and indirect sensitivity to new physics and discoveries.
Published: 2020
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28. Gravitational Waves from an Axion-Dark Photon System: A Lattice Study

Author: Ben A. Stefanek, Pedro Schwaller, and Wolfram Ratzinger
Subjects: Physics, Photon, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, Gravitational wave, media_common.quotation_subject, QC1-999, Cosmic microwave background, Dark matter, General Physics and Astronomy, FOS: Physical sciences, Polarization (waves), 01 natural sciences, Dark photon, Universe, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Quantum electrodynamics, 0103 physical sciences, 010306 general physics, Axion, media_common, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: In this work, we present a lattice study of an axion - dark photon system in the early Universe and show that the stochastic gravitational wave (GW) background produced by this system may be probed by future GW experiments across a vast range of frequencies. The numerical simulation on the lattice allows us to take into account non-linear backreaction effects and enables us to accurately predict the final relic abundance of the axion or axion-like particle (ALP) as well as its inhomogeneities, and gives a more precise prediction of the GW spectrum. Importantly, we find that the GW spectrum has more power at high momenta due to $2\rightarrow1$ processes. Furthermore, we find the degree of polarization of the peak of the GW spectrum depends on the ALP-dark photon coupling and that the polarization can be washed out or even flipped for large values thereof. In line with recent results in the literature, we find the ALP relic abundance may be suppressed by two orders of magnitude and discuss possible extensions of the model that expand the viable parameter space. Finally, we discuss the possibility to probe ultralight ALP dark matter via spectral distortions of the CMB., Comment: 27 pages, 9 figures. The source material includes the GW spectra in tabulated form. Version submitted for publication
Published: 2020
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29. Whispers from the dark side: Confronting light new physics with NANOGrav data

Author: Pedro Schwaller and Wolfram Ratzinger
Subjects: Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, QC1-999, Physics beyond the Standard Model, media_common.quotation_subject, General Physics and Astronomy, FOS: Physical sciences, Astrophysics, Parameter space, 01 natural sciences, Spectral line, Universe, Gravitational wave background, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Pulsar, 0103 physical sciences, Exponential decay, 010306 general physics, Axion, Astrophysics - Cosmology and Nongalactic Astrophysics, media_common
Abstract: The NANOGrav collaboration has recently observed first evidence of a gravitational wave background (GWB) in pulsar timing data. Here we explore the possibility that this GWB is due to new physics, and show that the signal can be well fit also with peaked spectra like the ones expected from phase transitions (PTs) or from the dynamics of axion like particles (ALPs) in the early universe. We find that a good fit to the data is obtained for a very strong PT at temperatures around 1 MeV to 10 MeV. For the ALP explanation the best fit is obtained for a decay constant of $F \approx 5\times 10^{17}$ GeV and an axion mass of $2\times 10^{-13}$ eV. We also illustrate the ability of PTAs to constrain the parameter space of these models, and obtain limits which are already comparable to other cosmological bounds., Comment: 10 pages, 5 figures
Published: 2020
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30. Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider

Author: Juliette Alimena, James Beacham, Martino Borsato, Yangyang Cheng, Xabier Cid Vidal, Giovanna Cottin, David Curtin, Albert De Roeck, Nishita Desai, Jared A Evans, Simon Knapen, Sabine Kraml, Andre Lessa, Zhen Liu, Sascha Mehlhase, Michael J Ramsey-Musolf, Heather Russell, Jessie Shelton, Brian Shuve, Monica Verducci, Jose Zurita, Todd Adams, Michael Adersberger, Cristiano Alpigiani, Artur Apresyan, Robert John Bainbridge, Varvara Batozskaya, Hugues Beauchesne, Lisa Benato, S Berlendis, Eshwen Bhal, Freya Blekman, Christina Borovilou, Jamie Boyd, Benjamin P Brau, Lene Bryngemark, Oliver Buchmueller, Malte Buschmann, William Buttinger, Mario Campanelli, Cari Cesarotti, Chunhui Chen, Hsin-Chia Cheng, Sanha Cheong, Matthew Citron, Andrea Coccaro, V Coco, Eric Conte, Félix Cormier, Louie D Corpe, Nathaniel Craig, Yanou Cui, Elena Dall’Occo, C Dallapiccola, M R Darwish, Alessandro Davoli, Annapaola de Cosa, Andrea De Simone, Luigi Delle Rose, Frank F Deppisch, Biplab Dey, Miriam D Diamond, Keith R Dienes, Sven Dildick, Babette Döbrich, Marco Drewes, Melanie Eich, M ElSawy, Alberto Escalante del Valle, Gabriel Facini, Marco Farina, Jonathan L Feng, Oliver Fischer, H U Flaecher, Patrick Foldenauer, Marat Freytsis, Benjamin Fuks, Iftah Galon, Yuri Gershtein, Stefano Giagu, Andrea Giammanco, Vladimir V Gligorov, Tobias Golling, Sergio Grancagnolo, Giuliano Gustavino, Andrew Haas, Kristian Hahn, Jan Hajer, Ahmed Hammad, Lukas Heinrich, Jan Heisig, J C Helo, Gavin Hesketh, Christopher S Hill, Martin Hirsch, M Hohlmann, Tova Holmes, W Hulsbergen, John Huth, Philip Ilten, Thomas Jacques, Bodhitha Jayatilaka, Geng-Yuan Jeng, K A Johns, Toshiaki Kaji, Gregor Kasieczka, Yevgeny Kats, Malgorzata Kazana, Henning Keller, Maxim Yu Khlopov, Felix Kling, Ted R Kolberg, Igor Kostiuk, Emma Sian Kuwertz, Audrey Kvam, Greg Landsberg, Gaia Lanfranchi, Iñaki Lara, Alexander Ledovskoy, Dylan Linthorne, Jia Liu, Iacopo Longarini, Steven Lowette, Henry Lubatti, Margaret Lutz, Jingyu Luo, Judita Mamuz̆ić, Matthieu Marinangeli, Alberto Mariotti, Daniel Marlow, Matthew McCullough, Kevin McDermott, P Mermod, David Milstead, Siddharth Mishra-Sharma, Vasiliki A Mitsou, Javier Montejo Berlingen, Filip Moortgat, Alessandro Morandini, Alice Polyxeni Morris, David Michael Morse, Stephen Mrenna, Benjamin Nachman, Miha Nemevs̆ek, Fabrizio Nesti, Christian Ohm, Silvia Pascoli, Kevin Pedro, Cristián Peña, Karla Josefina Pena Rodriguez, Jónatan Piedra, James L Pinfold, Antonio Policicchio, Goran Popara, Jessica Prisciandaro, Mason Proffitt, Giorgia Rauco, Federico Redi, Matthew Reece, Allison Reinsvold Hall, H Rejeb Sfar, Sophie Renner, Dean Robinson, Amber Roepe, Manfredi Ronzani, Ennio Salvioni, Arka Santra, Ryu Sawada, Jakub Scholtz, Philip Schuster, Pedro Schwaller, Cristiano Sebastiani, Sezen Sekmen, Michele Selvaggi, Weinan Si, Livia Soffi, Daniel Stolarski, David Stuart, John Stupak III, Kevin Sung, Wendy Taylor, Sebastian Templ, Brooks Thomas, Emma Torró-Pastor, Daniele Trocino, Sebastian Trojanowski, Marco Trovato, Yuhsin Tsai, C G Tully, Tamás Álmos Vámi, Juan Carlos Vasquez, Carlos Vázquez Sierra, K Vellidis, Basile Vermassen, Martina Vit, Devin G E Walker, Xiao-Ping Wang, Gordon Watts, Si Xie, Melissa Yexley, Charles Young, Jiang-Hao Yu, Piotr Zalewski, Yongchao Zhang, Physics, Elementary Particle Physics, Theoretical Physics, Ministerio de Economía y Competitividad (España), Mitsou, Vasiliki A, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Alimena J, Beacham J, Borsato M, Cheng YY, Vidal XC, Cottin G, Curtin D, De Roeck A, Desai N, Evans JA, Knapen S, Kraml S, Lessa A, Liu Z, Mehlhase S, Ramsey-Musolf MJ, Russell H, Shelton J, Shuve B, Verducci M, Zurita J, Adams T, Adersberger M, Alpigiani C, Apresyan A, Bainbridge RJ, Batozskaya V, Beauchesne H, Benato L, Berlendis S, Bhal E, Blekman F, Borovilou C, Boyd J, Brau BP, Bryngemark L, Buchmueller O, Buschmann M, Buttinger W, Campanelli M, Cesarotti C, Chen CH, Cheng HC, Cheong SH, Citron M, Coccaro A, Coco V, Conte E, Cormier F, Corpe LD, Craig N, Cui YO, Dall'Occo E, Dallapiccola C, Darwish MR, Davoli A, Cosa AD, Simone AD, Rose LD, Deppisch FF, Dey B, Diamond MD, Dienes KR, Dildick S, Dobrich B, Drewes M, Eich M, ElSawy M, Valle AED, Facini G, Farina M, Feng JL, Fischer O, Flaecher HU, Foldenauer P, Freytsis M, Fuks B, Galon I, Gershtein Y, Giagu S, Giammanco A, Gligorov VV, Golling T, Grancagnolo S, Gustavino G, Haas A, Hahn K, Hajer J, Hammad A, Heinrich L, Heisig J, Helo JC, Hesketh G, Hill CS, Hirsch M, Hohlmann M, Holmes T, Hulsbergen W, Huth J, Ilten P, Jacques T, Jayatilaka B, Jeng GY, Johns KA, Kaji T, Kasieczka G, Kats Y, Kazana M, Keller H, Khlopov MY, Kling F, Kolberg TR, Kostiuk I, Kuwertz ES, Kvam A, Landsberg G, Lanfranchi G, Lara I, Ledovskoy A, Linthorne D, Liu J, Longarini I, Lowette S, Lubatti H, Lutz M, Luo JY, Mamuzic J, Marinangeli M, Mariotti A, Marlow D, McCullough M, McDermott K, Mermod P, Milstead D, Mishra-Sharma S, Mitsou VA, Berlingen JM, Moortgat F, Morandini A, Morris AP, Morse DM, Mrenna S, Nachman B, Nemevsek M, Nesti F, Ohm C, Pascoli S, Pedro K, Pena C, Rodriguez KJP, Piedra J, Pinfold JL, Policicchio A, Popara G, Prisciandaro J, Proffitt M, Rauco G, Redi F, Reece M, Hall AR, Sfar HR, Renner S, Robinson D, Roepe A, Ronzani M, Salvioni E, Santra A, Sawada R, Scholtz J, Schuster P, Schwaller P, Sebastiani C, Sekmen S, Selvaggi M, Si WN, Soffi L, Stolarski D, Stuart D, Iii JS, Sung KV, Taylor W, Templ S, Thomas B, Torro-Pastor E, Trocino D, Trojanowski S, Trovato M, Tsai YH, Tully CG, Vami TA, Vasquez JC, Sierra CV, Vellidis K, Vermassen B, Vit M, Walker DGE, Wang XP, Watts G, Xie S, Yexley M, Young C, Yu JH, Zalewski P, Zhang YC, Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: HIGH-ENERGY, beyond the Standard Model, large hadron collider, Physics::Instrumentation and Detectors, PROTON-PROTON COLLISIONS, Physics beyond the Standard Model, beyond the standard model, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), high-luminosity lhc, High Energy Physics - Phenomenology (hep-ph), MAGNETIC MONOPOLES, long-lived [particle], high-energy collider experiments, decay: vertex, scattering [p p], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], long-lived particles, QC, proposed [detector], Physics, lifetime, dark gauge forces, Large Hadron Collider, CMS, ROOT-S=13 TEV, root-s=13 tev, new physics: search for, scale: electroweak interaction, hep-ph, ATLAS, electroweak interaction [scale], vertex [decay], upgrade [detector], High Energy Physics - Phenomenology, detector: upgrade, Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici, primary [vertex], ddc, CERN LHC Coll, baryon asymmetry, vertex: primary, LHC, colliding beams [p p], exclusion limits, pp collisions, Particle Physics - Experiment, signature, Nuclear and High Energy Physics, Particle physics, p p: scattering, CERN Lab, PAIR PRODUCTION, collider phenomenology, review, FOS: Physical sciences, DARK GAUGE FORCES, search for [new physics], BARYON ASYMMETRY, 0103 physical sciences, ddc:530, 010306 general physics, numerical calculations, Particle Physics - Phenomenology, EXCLUSION LIMITS, magnetic monopoles, PP COLLISIONS, 010308 nuclear & particles physics, hep-ex, background, bibliography, showers, MAJORANA NEUTRINOS, Collision, tracks, LHC-B, detector: proposed, high-luminosity LHC, pair production, MATHUSLA, Physics and Astronomy, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], proton-proton collisions, high-energy, majorana neutrinos, particle: long-lived, p p: colliding beams, Physics BSM, experimental results
Abstract: Particles beyond the Standard Model (SM) can generically have lifetimes that are long compared to SM particles at the weak scale. When produced at experiments such as the Large Hadron Collider (LHC) at CERN, these longlived particles (LLPs) can decay far from the interaction vertex of the primary proton–proton collision. Such LLP signatures are distinct from those of promptly decaying particles that are targeted by the majority of searches for new physics at the LHC, often requiring customized techniques to identify, for example, significantly displaced decay vertices, tracks with atypical properties, and short track segments. Given their non-standard nature, a comprehensive overview of LLP signatures at the LHC is beneficial to ensure that possible avenues of the discovery of new physics are not overlooked. Here we report on the joint work of a community of theorists and experimentalists with the ATLAS, CMS, and LHCb experiments—as well as those working on dedicated experiments such as MoEDAL, milliQan, MATHUSLA, CODEX-b, and FASER—to survey the current state of LLP searches at the LHC, and to chart a path for the development of LLP searches into the future, both in the upcoming Run 3 and at the high-luminosity LHC. The work is organized around the current and future potential capabilities of LHC experiments to generally discover new LLPs, and takes a signaturebased approach to surveying classes of models that give rise to LLPs rather than emphasizing any particular theory motivation. We develop a set of simplified models; assess the coverage of current searches; document known, often unexpected backgrounds; explore the capabilities of proposed detector upgrades; provide recommendations for the presentation of search results; and look towards the newest frontiers, namely high-multiplicity ‘dark showers’, highlighting opportunities for expanding the LHC reach for these signals.
Published: 2020
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31. Shining Light on the Scotogenic Model: Interplay of Colliders and Cosmology

Author: Sven Baumholzer, Alexander Segner, Pedro Schwaller, and Vedran Brdar
Subjects: Nuclear and High Energy Physics, Particle physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Dark matter, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Cosmology, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Neutrino Physics, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Light dark matter, Physics, Large Hadron Collider, Missing energy, 010308 nuclear & particles physics, Hot dark matter, Cosmology of Theories beyond the SM, High Energy Physics - Phenomenology, Beyond Standard Model, lcsh:QC770-798, High Energy Physics::Experiment, Neutrino, Lepton, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: In the framework of the scotogenic model, which features radiative generation of neutrino masses, we explore light dark matter scenario. Throughout the paper we chiefly focus on keV-scale dark matter which can be produced either via freeze-in through the decays of the new scalars, or from the decays of next-to-lightest fermionic particle in the spectrum, which is produced through freeze-out. The latter mechanism is required to be suppressed as it typically produces a hot dark matter component. Constraints from BBN are also considered and in combination with the former production mechanism they impose the dark matter to be light. For this scenario we consider signatures at High Luminosity LHC and proposed future hadron and lepton colliders, namely FCC-hh and CLIC, focusing on searches with two leptons and missing energy as a final state. While a potential discovery at High Luminosity LHC is in tension with limits from cosmology, the situation greatly improves for future colliders., 28 pages, 11 figures, matches published version
Published: 2019

32. Ricci Reheating

Author: Toby Opferkuch, Pedro Schwaller, and Ben A. Stefanek
Subjects: Astrophysics and Astronomy, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, General Relativity and Cosmology, gr-qc, FOS: Physical sciences, Astronomy and Astrophysics, hep-ph, Astrophysics::Cosmology and Extragalactic Astrophysics, General Relativity and Quantum Cosmology (gr-qc), 7. Clean energy, 01 natural sciences, General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, astro-ph.CO, 010306 general physics, Astrophysics - Cosmology and Nongalactic Astrophysics, Particle Physics - Phenomenology
Abstract: We present a model for viable gravitational reheating involving a scalar field directly coupled to the Ricci curvature scalar. Crucial to the model is a period of kination after inflation, which causes the Ricci scalar to change sign thus inducing a tachyonic effective mass $m^{2} \propto -H^2$ for the scalar field. The resulting tachyonic growth of the scalar field provides the energy for reheating, allowing for temperatures high enough for thermal leptogenesis. Additionally, the required period of kination necessarily leads to a blue-tilted primordial gravitational wave spectrum with the potential to be detected by future experiments. We find that for reheating temperatures $T_{\rm RH} \lesssim 1$ GeV, the possibility exists for the Higgs field to play the role of the scalar field., Comment: 9 pages, 6 figures
Published: 2019
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33. Dark, Cold, and Noisy: Constraining Secluded Hidden Sectors with Gravitational Waves

Author: Eric Madge, Toby Opferkuch, Moritz Breitbach, Pedro Schwaller, and Joachim Kopp
Subjects: Physics, Astrophysics and Astronomy, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, Gravitational wave, Dark matter, High Energy Physics::Phenomenology, Degrees of freedom (statistics), FOS: Physical sciences, Astronomy and Astrophysics, Observable, hep-ph, 01 natural sciences, Standard Model, Hidden sector, High Energy Physics - Phenomenology, Theoretical physics, High Energy Physics - Phenomenology (hep-ph), Pulsar, 0103 physical sciences, astro-ph.CO, Astrophysics - Cosmology and Nongalactic Astrophysics, Gauge symmetry, Particle Physics - Phenomenology
Abstract: We explore gravitational wave signals arising from first-order phase transitions occurring in a secluded hidden sector, allowing for the possibility that the hidden sector may have a different temperature than the Standard Model sector. We present the sensitivity to such scenarios for both current and future gravitational wave detectors in a model-independent fashion. Since secluded hidden sectors are of particular interest for dark matter models at the MeV scale or below, we pay special attention to the reach of pulsar timing arrays. Cosmological constraints on light degrees of freedom restrict the number of sub-MeV particles in a hidden sector, as well as the hidden sector temperature. Nevertheless, we find that observable first-order phase transitions can occur. To illustrate our results, we consider two minimal benchmark models: a model with two gauge singlet scalars and a model with a spontaneously broken $U(1)$ gauge symmetry in the hidden sector., Comment: 37 pages, 12 figures. Noise and PLI sensitivity curves are included in the source directory
Published: 2018

34. A flavoured dark sector

Author: Pedro Schwaller and Sophie Renner
Subjects: Quark, Nuclear and High Energy Physics, Particle physics, Meson, High Energy Physics::Lattice, Dark matter, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, High Energy Physics - Experiment, Flavor physics, High Energy Physics - Experiment (hep-ex), Pion, High Energy Physics - Phenomenology (hep-ph), Big Bang nucleosynthesis, Hadron-Hadron scattering (experiments), 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Computer Science::Information Retrieval, High Energy Physics::Phenomenology, Hadronization, Baryon, High Energy Physics - Phenomenology, Beyond Standard Model, lcsh:QC770-798, High Energy Physics::Experiment, Phenomenology (particle physics)
Abstract: We explore the phenomenology of a QCD-like dark sector which confines around the GeV scale. The dark sector inherits a flavour structure from a coupling between dark quarks and SM quarks via a heavy mediator, which leads to exciting new phenomena. While stable baryonic bound states are the dark matter candidates, the phenomenology is dominated by the lightest composite mesons, the dark pions, which can have decay lengths ranging from millimetres to hundreds of meters. For masses below 1.5 GeV, their exclusive decays to SM mesons are calculated for the first time by matching both dark and visible sectors to a chiral Lagrangian. Constraints from big bang nucleosynthesis, dark matter direct detection and flavour single out a small region of allowed parameter space for dark pion masses below 5 GeV. It is best probed by the fixed target experiments NA62 and SHiP, where dark pions can be produced copiously in rare decays like B to K piD. Heavier dark pions are best searched for at the LHC, where they decay after hadronisation to produce jets which emerge into SM states within the detector. Here the flavour structure ensures different flavours emerge on different length scales, leading to a striking new feature in the emerging jets signature., Comment: 32 pages, 14 figures. v2: Amended references
Published: 2018

35. Runaway relaxion monodromy

Author: Geraldine Servant, Pedro Schwaller, Liam McAllister, Alexander Westphal, and John Stout
Subjects: High Energy Physics - Theory, Nuclear and High Energy Physics, Particle physics, FOS: Physical sciences, Discrete Symmetries, Context (language use), Higgs particle, String theory, 01 natural sciences, membrane model, High Energy Physics::Theory, High Energy Physics - Phenomenology (hep-ph), Type IIB [supergravity], Flux compactifications, 0103 physical sciences, Brane cosmology, ddc:530, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, string model, 010306 general physics, Axion, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Winding number, Effective Field Theories, Charge (physics), flux [compactification], back reaction, High Energy Physics - Phenomenology, High Energy Physics - Theory (hep-th), Monodromy, axion, Higgs boson, lcsh:QC770-798, charge [monodromy]
Abstract: We examine the relaxion mechanism in string theory. An essential feature is that an axion winds over $N \gg 1$ fundamental periods. In string theory realizations via axion monodromy, this winding number corresponds to a physical charge carried by branes or fluxes. We show that this monodromy charge backreacts on the compact space, ruining the structure of the relaxion action. In particular, the barriers generated by strong gauge dynamics have height $\propto e^{-N}$, so the relaxion does not stop when the Higgs acquires a vev. Backreaction of monodromy charge can therefore spoil the relaxion mechanism. We comment on the limitations of technical naturalness arguments in this context., 1+45 pages, 4 appendices, 5 figures
Published: 2018
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36. Erratum to: Closing the window for compressed dark sectors with disappearing charged tracks

Author: Pedro Schwaller, Rakhi Mahbubani, and José Zurita
Subjects: Physics, Nuclear and High Energy Physics, Web of science, 010308 nuclear & particles physics, business.industry, Window (computing), 01 natural sciences, Optics, 0103 physical sciences, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Closing (morphology), business
Abstract: Reference EPFL-ARTICLE-232859doi:10.1007/Jhep10(2017)061View record in Web of Science Record created on 2017-12-04, modified on 2017-12-04
Published: 2017

37. Simplified Models for Displaced Dark Matter Signatures

Author: Kristian Allan Hahn, Oliver Buchmueller, Kevin Sung, Tien-Tien Yu, Matthew McCullough, Pedro Schwaller, and Albert De Roeck
Subjects: COLLISIONS, Nuclear and High Energy Physics, Particle physics, Dark matter, FOS: Physical sciences, 01 natural sciences, Physics, Particles & Fields, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), SEARCHES, High Energy Physics - Phenomenology (hep-ph), Naturalness, Hadron-Hadron scattering (experiments), 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Neutral particle, 01 Mathematical Sciences, Particle Physics - Phenomenology, Physics, Science & Technology, 02 Physical Sciences, Large Hadron Collider, 010308 nuclear & particles physics, hep-ex, hep-ph, Supersymmetry, Nuclear & Particles Physics, HIGGS, Signature (logic), Charged particle, Vertex (geometry), COLLIDERS, High Energy Physics - Phenomenology, Physical Sciences, Beyond Standard Model, JETS, TEV, lcsh:QC770-798, LHC, Lifetime, Particle Physics - Experiment, BREAKING
Abstract: We propose a systematic programme to search for long-lived neutral particle signatures through a minimal set of displaced searches (dMETs). Our approach is to extend the well-established dark matter simplified models to include displaced vertices. The dark matter simplified models are used to describe the primary production vertex. A displaced secondary vertex, characterised by the mass of the long-lived particle and its lifetime, is added for the displaced signature. We show how these models can be motivated by, and mapped onto, complete models such as gauge-mediated SUSY breaking and models of neutral naturalness. We also outline how this approach may be used to extend other simplified models to incorporate displaced signatures and to characterise searches for long-lived charged particles. Displaced vertices are a striking signature which is often virtually background free, and thus provide an excellent target for the high-luminosity run of the Large Hadron Collider. The proposed models and searches provide a first step towards a systematic broadening of the displaced dark matter search programme. We propose a systematic programme to search for long-lived neutral particle signatures through a minimal set of displaced searches requiring significant missing transverse energy (dMETs). Our approach is to extend the well-established dark matter simplified models to include displaced vertices. The dark matter simplified models are used to describe the primary production vertex. A displaced secondary vertex, characterised by the mass of the long-lived particle and its lifetime, is added for the displaced signature. We show how these models can be motivated by, and mapped onto, complete models such as gauge-mediated SUSY breaking and models of neutral naturalness. We also outline how this approach may be used to extend other simplified models to incorporate displaced signatures and to characterise searches for long-lived charged particles. Displaced vertices are a striking signature with virtually no backgrounds from SM processes, and thus provide an excellent target for the high-luminosity run of the Large Hadron Collider. The proposed models and searches provide a first step towards a systematic broadening of the displaced dark matter search programme.
Published: 2017

38. Science with the space-based interferometer eLISA. II: gravitational waves from cosmological phase transitions

Author: Germano Nardini, Thomas Konstandin, Jose Miguel No, Stephan J. Huber, Mark Hindmarsh, Antoine Petiteau, David J. Weir, Pedro Schwaller, Chiara Caprini, Jonathan Kozaczuk, Geraldine Servant, Institut de Physique Théorique - UMR CNRS 3681 (IPHT), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Institut de Physique Théorique - UMR CNRS 3681 ( IPHT ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Centre National de la Recherche Scientifique ( CNRS ), AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: Phase transition, Cosmology and Nongalactic Astrophysics (astro-ph.CO), gravitational radiation: stochastic, 530 Physics, media_common.quotation_subject, Physics beyond the Standard Model, [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], FOS: Physical sciences, Astrophysics, General Relativity and Quantum Cosmology (gr-qc), Magnetohydrodynamic turbulence, 01 natural sciences, General Relativity and Quantum Cosmology, [ PHYS.GRQC ] Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Gravitational wave background, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, ddc:530, 010306 general physics, detector: design, media_common, Physics, 010308 nuclear & particles physics, Gravitational wave, new physics, Detector, turbulence, gravitational radiation: background, Astronomy and Astrophysics, critical phenomena, gravitational radiation detector: satellite, sensitivity, Universe, background: stochastic, Computational physics, Interferometry, High Energy Physics - Phenomenology, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], gravitational radiation detector: interferometer, [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We investigate the potential for the eLISA space-based interferometer to detect the stochastic gravitational wave background produced by strong first-order cosmological phase transitions. We discuss the resulting contributions from bubble collisions, magnetohydrodynamic turbulence, and sound waves to the stochastic background, and estimate the total corresponding signal predicted in gravitational waves. The projected sensitivity of eLISA to cosmological phase transitions is computed in a model-independent way for various detector designs and configurations. By applying these results to several specific models, we demonstrate that eLISA is able to probe many well-motivated scenarios beyond the Standard Model of particle physics predicting strong first-order cosmological phase transitions in the early Universe., Comment: 45 pages, 7 figures. Accepted for publication in JCAP, added discussion on noise from galactic binaries and citations
Published: 2016
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39. Photons, Photon Jets and Dark Photons at 750 GeV and Beyond

Author: Pedro Schwaller, Joachim Kopp, and Basudeb Dasgupta
Subjects: Particle physics, Photon, Physics and Astronomy (miscellaneous), Physics beyond the Standard Model, Astrophysics::High Energy Astrophysical Phenomena, Scalar (mathematics), collinear, FOS: Physical sciences, Physics::Optics, Context (language use), Jet (particle physics), 01 natural sciences, Dark photon, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), jet [photon], 0103 physical sciences, ddc:530, 010306 general physics, pseudoscalar, Engineering (miscellaneous), two-photon, lifetime, Physics, new physics, 010308 nuclear & particles physics, 750 GeV diphoton excess, sensitivity, Pseudoscalar, High Energy Physics - Phenomenology, CERN LHC Coll, High Energy Physics::Experiment, Regular Article - Theoretical Physics
Abstract: In new physics searches involving photons at the LHC, one challenge is to distinguish scenarios with isolated photons from models leading to "photon jets". For instance, in the context of the 750 GeV diphoton excess, it was pointed out that a true diphoton resonance $S \to \gamma\gamma$ can be mimicked by a process of the form $p p \to S \to a a \to 4\gamma$, where $S$ is a new scalar with a mass of 750 GeV and $a$ is a light pseudoscalar decaying to two collinear photons. Photon jets can be distinguished from isolated photons by exploiting the fact that a large fraction of photons convert to an $e^+e^-$ pair inside the inner detector. In this note, we quantify this discrimination power, and we study how the sensitivity of future searches differs for photon jets compared to isolated photons. We also investigate how our results depend on the lifetime of the particle(s) decaying to the photon jet. Finally, we discuss the extension to $S\to A^\prime A^\prime\to e^+e^-e^+e^-$, where there are no photons at all but the dark photon $A^\prime$ decays to $e^+e^-$ pairs. Our results will be useful in future studies of the putative 750 GeV signal, but also more generally in any new physics search involving hard photons., Comment: 13 pages, 5 figures. V2: Improved detector simulation, journal version
Published: 2016
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40. Relaxing the electroweak scale: the role of broken dS symmetry

Author: Pedro Schwaller and Subodh P. Patil
Subjects: High Energy Physics - Theory, Particle physics, Nuclear and High Energy Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics beyond the Standard Model, FOS: Physical sciences, ddc:500.2, 01 natural sciences, High Energy Physics - Phenomenology (hep-ph), De Sitter universe, 0103 physical sciences, 010306 general physics, Axion, Particle Physics - Phenomenology, Physics, Quantum chromodynamics, 010308 nuclear & particles physics, Hierarchy problem, Inflaton, Cosmology of Theories beyond the SM, High Energy Physics - Phenomenology, High Energy Physics - Theory (hep-th), Beyond Standard Model, Higgs boson, Electroweak scale, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: Recently, a novel mechanism to address the hierarchy problem has been proposed \cite{Graham:2015cka}, where the hierarchy between weak scale physics and any putative `cutoff' $M$ is translated into a parametrically large field excursion for the so-called relaxion field, driving the Higgs mass to values much less than $M$ through cosmological dynamics. In its simplest incarnation, the relaxion mechanism requires nothing beyond the standard model other than an axion (the relaxion field) and an inflaton. In this note, we critically re-examine the requirements for successfully realizing the relaxion mechanism and point out that parametrically larger field excursions can be obtained for a given number of e-folds by simply requiring that the background break exact de Sitter invariance. We discuss several corollaries of this observation, including the interplay between the upper bound on the scale $M$ and the order parameter $\epsilon$ associated with the breaking of dS symmetry, and entertain the possibility that the relaxion could play the role of a curvaton. We find that a successful realization of the mechanism is possible with as few as $\mathcal O (10^3)$ e-foldings, albeit with a reduced cutoff $M \sim 10^6$ GeV for a dark QCD axion and outline a minimal scenario that can be made consistent with CMB observations., Comment: 16 pages, 3 figures. Version to appear in JHEP
Published: 2016

41. A facility to Search for Hidden Particles at the CERN SPS: the SHiP physics case

Author: Marco Drewes, Joerg Jaeckel, Belen Gavela, Guenakh Mitselmakher, Lesya Shchutska, Osamu Seto, Jessie Shelton, Simone Marcocci, Rabindra N. Mohapatra, Stefania Gori, Oleg Ruchayskiy, Andreas Ringwald, Fedor Bezrukov, Dmitry Gorbunov, Martin Wolfgang Winkler, Juan Carlos Helo, Kathryn M. Zurek, Maxim Pospelov, Christophe Grojean, Anurag Tripathi, Sacha Davidson, Brian Shuve, Valery Rubakov, Rouven Essig, Andrew Spray, Wolfgang Altmannshofer, Alberto Guffanti, David E. Morrissey, Mary Hall Reno, Takehiko Asaka, Sean Tulin, Kyrylo Bondarenko, Emmanuel A. Paschos, Choong Sun Kim, Patrick deNiverville, Mikhail Shaposhnikov, Alejandro Ibarra, Cristóbal Corral, Ingo Schienbein, Valery E. Lyubovitskij, Ki-Young Choi, Pilar Hernández, Adam Ritz, Yonatan Kahn, Felix Kahlhoefer, Steen Honoré Hansen, P. S. Bhupal Dev, Gian F. Giudice, Anthony Fradette, Francesco Vissani, Daniel Schmeier, Matt Strassler, Alexey Boyarsky, Maksym Ovchynnikov, Brian Batell, Daniel Stolarski, Herbi K. Dreiner, Björn Garbrecht, Sergey Alekhin, Kai Schmidt-Hoberg, Eder Izaguirre, David Curtin, Francesco Tramontano, Michael Spannowsky, Vladimir Tello, André de Gouvêa, Mark D. Goodsell, Thomas Hambye, Apostolos Pilaftsis, Goran Senjanovic, Shintaro Eijima, Gordan Krnjaic, Robert Shrock, Sergey A. Kovalenko, Yu Seon Jeong, Leszek Roszkowski, David McKeen, Pedro Schwaller, Stefano Dell'Oro, Artem Ivashko, Matthew McCullough, Nathaniel Craig, Sven-Olaf Moch, Florian Staub, Andrey Katz, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS), Alekhin, Sergey, Altmannshofer, Wolfgang, Asaka, Takehiko, Batell, Brian, Bezrukov, Fedor, Bondarenko, Kyrylo, Boyarsky, Alexey, Choi, Ki Young, Corral, Cristóbal, Craig, Nathaniel, Curtin, David, Davidson, Sacha, De Gouvea, André, Dell'Oro, Stefano, Deniverville, Patrick, Bhupal Dev, P. S., Dreiner, Herbi, Drewes, Marco, Eijima, Shintaro, Essig, Rouven, Fradette, Anthony, Garbrecht, Björn, Gavela, Belen, Giudice, Gian F, Goodsell, Mark D, Gorbunov, Dmitry, Gori, Stefania, Grojean, Christophe, Guffanti, Alberto, Hambye, Thoma, Hansen, Steen H, Helo, Juan Carlo, Hernandez, Pilar, Ibarra, Alejandro, Ivashko, Artem, Izaguirre, Eder, Jaeckel, Joerg, Jeong, Yu Seon, Kahlhoefer, Felix, Kahn, Yonatan, Katz, Andrey, Kim, Choong Sun, Kovalenko, Sergey, Krnjaic, Gordan, Lyubovitskij, Valery E, Marcocci, Simone, Mccullough, Matthew, Mckeen, David, Mitselmakher, Guenakh, Moch, Sven Olaf, Mohapatra, Rabindra N, Morrissey, David E, Ovchynnikov, Maksym, Paschos, Emmanuel, Pilaftsis, Apostolo, Pospelov, Maxim, Reno, Mary Hall, Ringwald, Andrea, Ritz, Adam, Roszkowski, Leszek, Rubakov, Valery, Ruchayskiy, Oleg, Schienbein, Ingo, Schmeier, Daniel, Schmidt Hoberg, Kai, Schwaller, Pedro, Senjanovic, Goran, Seto, Osamu, Shaposhnikov, Mikhail, Shchutska, Lesya, Shelton, Jessie, Shrock, Robert, Shuve, Brian, Spannowsky, Michael, Spray, Andy, Staub, Florian, Stolarski, Daniel, Strassler, Matt, Tello, Vladimir, Tramontano, Francesco, Tripathi, Anurag, Tulin, Sean, Vissani, Francesco, Winkler, Martin W, and Zurek, Kathryn M.
Subjects: dark photons, Particle physics, Physics beyond the Standard Model, Dark matter, FOS: Physical sciences, General Physics and Astronomy, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Baryon asymmetry, Tau neutrino, heavy neutral leptons, 0103 physical sciences, beyond the standard model physics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, heavy neutral lepton, Detectors and Experimental Techniques, 010306 general physics, Physics, Large Hadron Collider, intensity frontier experiment, 010308 nuclear & particles physics, Supersymmetry, hidden sector, High Energy Physics - Phenomenology, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], dark photon, beyond the standard model physic, High Energy Physics::Experiment, hidden sectors, Neutrino, neutrino Physics, Lepton
Abstract: Reports on progress in physics 79(12), 124201(2016). doi:10.1088/0034-4885/79/12/124201, This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (search for hidden particles) experiment is intended to hunt for new physics in the largely unexplored domain of very weakly interacting particles with masses below the Fermi scale, inaccessible to the LHC experiments, and to study tau neutrino physics. The same proton beam setup can be used later to look for decays of tau-leptons with lepton flavour number non-conservation, →τμ3 and to search for weakly-interacting sub-GeV dark matter candidates. We discuss the evidence for physics beyond the standard model and describe interactions between new particles and four different portals—scalars, vectors, fermions or axion-like particles. We discuss motivations for different models, manifesting themselves via these interactions, and how they can be probed with the SHiP experiment and present several case studies. The prospects to search for relatively light SUSY and composite particles at SHiP are also discussed. We demonstrate that the SHiP experiment has a unique potential to discover new physics and can directly probe a number of solutions of beyond the standard model puzzles, such as neutrino masses, baryon asymmetry of the Universe, dark matter, and inflation., Published by IOP Publ., Bristol
Published: 2016
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42. Flavoured leptogenesis in the CTP formalism

Author: Matti Herranen, Pedro Schwaller, Christian Fidler, Björn Garbrecht, and Martin Beneke
Subjects: High Energy Physics - Theory, Physics, Nuclear and High Energy Physics, Particle physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Quantum decoherence, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Flavour, Yukawa potential, FOS: Physical sciences, Lepton number, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Distribution function, High Energy Physics - Theory (hep-th), Dispersion relation, Leptogenesis, High Energy Physics::Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics, Lepton
Abstract: Within the Closed Time Path (CTP) framework, we derive kinetic equations for particle distribution functions that describe leptogenesis in the presence of several lepton flavours. These flavours have different Standard-Model Yukawa couplings, which induce flavour-sensitive scattering processes and thermal dispersion relations. Kinetic equilibrium, which is rapidly established and maintained via gauge interactions, allows to simplify these equations to kinetic equations for the matrix of lepton charge densities. In performing this simplification, we notice that the rapid flavour-blind gauge interactions damp the flavour oscillations of the leptons. Leptogenesis turns out to be in the parametric regime where the flavour oscillations are overdamped and flavour decoherence is mainly induced by flavour sensitive scatterings. We solve the kinetic equations for the lepton number densities numerically and show that they interpolate between the unflavoured and the fully flavoured regimes within the intermediate parametric region, where neither of these limits is applicable., 44 pages, 8 figures
Published: 2011
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43. Gravitational Waves from a Dark Phase Transition

Author: Pedro Schwaller
Subjects: Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Gravitational wave, media_common.quotation_subject, Physics beyond the Standard Model, Dark matter, High Energy Physics::Phenomenology, FOS: Physical sciences, General Physics and Astronomy, Strongly interacting massive particle, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Universe, Gravitation, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Pulsar, Dark fluid, Particle Physics - Phenomenology, media_common, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: In this work, we show that a large class of models with a composite dark sector undergo a strong first order phase transition in the early universe, which could lead to a detectable gravitational wave signal. We summarise the basic conditions for a strong first order phase transition for SU(N) dark sectors with n_f flavours, calculate the gravitational wave spectrum and show that, depending on the dark confinement scale, it can be detected at eLISA or in pulsar timing array experiments. The gravitational wave signal provides a unique test of the gravitational interactions of a dark sector, and we discuss the complementarity with conventional searches for new dark sectors. The discussion includes Twin Higgs and SIMP models as well as symmetric and asymmetric composite dark matter scenarios., 12 pages, 3 figures. v2: Added references, Fig. 3 improved
Published: 2015

44. Scale of dark QCD

Author: Yang Bai and Pedro Schwaller
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Lattice, Hot dark matter, High Energy Physics::Phenomenology, Dark matter, Scalar field dark matter, Astrophysics::Cosmology and Extragalactic Astrophysics, Baryonic dark matter, Warm dark matter, High Energy Physics::Experiment, Gravitino, Light dark matter, Dark fluid
Abstract: Most of the mass of ordinary matter has its origin from quantum chromodynamics (QCD). A similar strong dynamics, dark QCD, could exist to explain the mass origin of dark matter. Using infrared fixed points of the two gauge couplings, we provide a dynamical mechanism that relates the dark QCD confinement scale to our QCD scale, and hence provides an explanation for comparable dark baryon and proton masses. Together with a mechanism that generates equal amounts of dark baryon and ordinary baryon asymmetries in the early Universe, the similarity of dark matter and ordinary matter energy densities can be naturally explained. For a large class of gauge group representations, the particles charged under both QCD and dark QCD, necessary ingredients for generating the infrared fixed points, are found to have masses at 1--2 TeV, which sets the scale for dark matter direct detection and novel collider signatures involving visible and dark jets.
Published: 2014
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45. Compressed electroweakino spectra at the LHC

Author: José Zurita and Pedro Schwaller
Subjects: Systematic error, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Missing energy, High Energy Physics::Phenomenology, FOS: Physical sciences, Supersymmetry, Parameter space, Spectral line, High Energy Physics - Experiment, 3. Good health, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), High Energy Physics::Experiment, Sensitivity (control systems), Particle Physics - Phenomenology, Lepton
Abstract: In this work, we examine the sensitivity of monojet searches at the LHC to directly produced charginos and neutralinos (electroweakinos) in the limit of small mass splitting, where the traditional multilepton plus missing energy searches loose their sensitivity. We first recast the existing 8 TeV monojet search at CMS in terms of a SUSY simplified model with only light gauginos (winos and binos) or only light higgsinos. The current searches are not sensitive to MSSM like production cross sections, but would be sensitive to models with 2-20 times enhanced production cross section, for particle masses between 100 GeV and 250 GeV. Then we explore the sensitivity in the 14 TeV run of the LHC. Here we emphasise that in addition to the pure monojet search, soft leptons present in the samples can be used to increase the sensitivity. Exclusion of electroweakino masses up to 200 GeV is possible with 300 fb$^{-1}$ at the LHC, if the systematic error can be reduced to the 1% level. Discovery is possible with 3000 fb$^{-1}$ in some regions of parameter space., Comment: 22 pages, 10 figures. Minor corrections, references added, matched published version
Published: 2014

46. Dark Matter and Vector-like Leptons From Gauged Lepton Number

Author: Pedro Schwaller, Roberto Vega-Morales, and Tim M. P. Tait
Subjects: Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Spontaneous symmetry breaking, Electroweak interaction, Dark matter, High Energy Physics::Phenomenology, FOS: Physical sciences, Global symmetry, 7. Clean energy, 01 natural sciences, Lepton number, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, Neutrino, 010306 general physics, Astrophysics - High Energy Astrophysical Phenomena, Lepton
Abstract: We investigate a simple model where Lepton number is promoted to a local $U(1)_L$ gauge symmetry which is then spontaneously broken, leading to a viable thermal DM candidate and vector-like leptons as a byproduct. The dark matter arises as part of the exotic lepton sector required by the need to satisfy anomaly cancellation and is a Dirac electroweak (mostly) singlet neutrino. It is stabilized by an accidental global symmetry of the renormalizable Lagrangian which is preserved even after the gauged lepton number is spontaneously broken and can annihilate efficiently to give the correct thermal relic abundance. We examine the ability of this model to give a viable DM candidate and discuss both direct and indirect detection implications. We also examine some of the LHC phenomenology of the associated exotic lepton sector and in particular its effects on Higgs decays., References and a few comments added
Published: 2013

47. A Supersymmetric Theory of Vector-like Leptons

Author: Carlos E. M. Wagner, Pedro Schwaller, and A. Joglekar
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Scale (ratio), High Energy Physics::Phenomenology, Yukawa potential, Order (ring theory), FOS: Physical sciences, Gauge (firearms), Stability (probability), Instability, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Higgs boson, High Energy Physics::Experiment, Lepton
Abstract: We study a supersymmetric extension of the vector-like lepton scenario, such that the vacuum instability induced by large lepton Yukawa couplings is lifted by the presence of superpartners at or below the TeV scale. In order to preserve the unification of gauge couplings, we introduce a full 16+\bar{16} of SO(10), and determine the maximal possible values for the Yukawa couplings consistent with perturbativity at the GUT scale. We find that the Higgs to diphoton decay rate can be enhanced by up to 50% while maintaining vacuum stability and keeping the new particle masses above 100 GeV, while larger enhancements are possible if the masses of the new particles are lowered further., 25 pages, 9 figures; v2: added references and discussion of CMS diphoton result; v3: minor improvements, JHEP version
Published: 2013

48. Scattering Rates For Leptogenesis: Damping of Lepton Flavour Coherence and Production of Singlet Neutrinos

Author: Björn Garbrecht, Pedro Schwaller, and Frank Glowna
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Logarithm, Scattering, Physics beyond the Standard Model, High Energy Physics::Lattice, Flavour, High Energy Physics::Phenomenology, FOS: Physical sciences, Fermion, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Leptogenesis, High Energy Physics::Experiment, Neutrino, Lepton
Abstract: Using the Closed-Time-Path approach, we perform a systematic leading order calculation of the relaxation rate of flavour correlations of left-handed Standard Model leptons. This quantity is of pivotal relevance for flavoured Leptogenesis in the Early Universe, and we find it to be 5.19*10^-3 T at T=10^7 GeV and 4.83*10^-3 T at T=10^13 GeV. These values apply to the Standard Model with a Higgs-boson mass of 125 GeV. The dependence of the numerical coefficient on the temperature T is due to the renormalisation group running. The leading linear and logarithmic dependencies of the flavour relaxation rate on the gauge and top-quark couplings are extracted, such that the results presented in this work can readily be applied to extensions of the Standard Model. We also derive the production rate of light (compared to the temperature) sterile right-handed neutrinos, a calculation that relies on the same methods. We confirm most details of earlier results, but find a substantially larger contribution from the t-channel exchange of fermions., Comment: 43 pages, 11 figures
Published: 2013
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49. Dark Matter and enhanced h → γγ rate from vector-like Leptons

Author: A. Joglekar, Pedro Schwaller, and Carlos E. M. Wagner
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Photon, High Energy Physics::Phenomenology, Electroweak interaction, Dark matter, Higgs boson, Yukawa potential, High Energy Physics::Experiment, Standard Model, Lepton
Abstract: In this paper, we study an extension of the standard model with a vector-like generation of leptons. This model provides a viable dark matter candidate and a possibility to enhance the Higgs decay rate into a pair of photons. We evaluate constraints from electroweak precision tests and from vacuum stability, and find that the latter provide an upper limit on the lepton Yukawa couplings. A large enhancement of the Higgs di-photon rate can therefore only be obtained when the mass of the lightest charged lepton is close to the LEP limit. The relic density constraint suggests a co-annihilation scenario with a small mass difference between the lightest charged and neutral leptons, which also weakens the LEP limit on the lightest charged lepton mass and allows for larger Higgs di-photon decay rates. Cross sections for direct detection of the dark matter candidate are calculated, and prospects for detecting the new particles at the LHC are discussed briefly.
Published: 2012
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50. Looking for a light Higgs boson in theZγ→ll¯γchannel

Author: James S. Gainer, Pedro Schwaller, Ian Low, and Wai-Yee Keung
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Photon, Higgs boson, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), Communication channel
Abstract: This is a copy of an article published in the Physical Review D © 2012 American Physical Society. The publication is available at http://prd.aps.org/
Published: 2012
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