53 results on '"Simon Knapen"'
Search Results
2. Theory, phenomenology, and experimental avenues for dark showers: a Snowmass 2021 report
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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
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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.
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- 2022
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3. Lepton-flavor violating axions at MEG II
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Yongsoo Jho, Simon Knapen, and Diego Redigolo
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Axions and ALPs ,Theories of Flavour ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract We study the sensitivity of the existing MEG data to lepton flavor violating axion-like particles produced through μ + → e + aγ and estimate the discovery potential for the upcoming MEG II experiment in this channel. The MEG II signal efficiency can be improved significantly if a new trigger can be implemented in a dedicated run with a reduced beam intensity. This search would establish the world leading measurement in this channel with only 1 month of data taking.
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- 2022
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4. Expression of interest for the CODEX-b detector
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Giulio Aielli, Eli Ben-Haim, Roberto Cardarelli, Matthew John Charles, Xabier Cid Vidal, Victor Coco, Biplab Dey, Raphael Dumps, Jared A. Evans, George Gibbons, Olivier Le Dortz, Vladimir V. Gligorov, Philip Ilten, Simon Knapen, Jongho Lee, Saul López Soliño, Benjamin Nachman, Michele Papucci, Francesco Polci, Robin Quessard, Harikrishnan Ramani, Dean J. Robinson, Heinrich Schindler, Michael D. Sokoloff, Paul Swallow, Riccardo Vari, Nigel Watson, and Mike Williams
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Astrophysics ,QB460-466 ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract This document presents the physics case and ancillary studies for the proposed CODEX-b long-lived particle (LLP) detector, as well as for a smaller proof-of-concept demonstrator detector, CODEX- $$\beta $$ β , to be operated during Run 3 of the LHC. Our development of the CODEX-b physics case synthesizes ‘top-down’ and ‘bottom-up’ theoretical approaches, providing a detailed survey of both minimal and complete models featuring LLPs. Several of these models have not been studied previously, and for some others we amend studies from previous literature: In particular, for gluon and fermion-coupled axion-like particles. We moreover present updated simulations of expected backgrounds in CODEX-b’s actively shielded environment, including the effects of shielding propagation uncertainties, high-energy tails and variation in the shielding design. Initial results are also included from a background measurement and calibration campaign. A design overview is presented for the CODEX- $$\beta $$ β demonstrator detector, which will enable background calibration and detector design studies. Finally, we lay out brief studies of various design drivers of the CODEX-b experiment and potential extensions of the baseline design, including the physics case for a calorimeter element, precision timing, event tagging within LHCb, and precision low-momentum tracking.
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- 2020
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5. Probing naturally light singlets with a displaced vertex trigger
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Yuri Gershtein, Simon Knapen, and Diego Redigolo
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Physics ,QC1-999 - Abstract
We investigate the physics case for a dedicated trigger on a low mass, hadronic displaced vertex at the high luminosity LHC, relying on the CMS phase II track trigger. We estimate the trigger efficiency with a simplified simulation of the CMS track trigger and show that the L1 trigger rate from fake vertices, B meson decays and secondary interactions with the detector material can likely be brought down to the kHz level with a minimal set of cuts. While it would with any doubt be a severe experimental challenge to implement, we conclude that a displaced vertex trigger could open qualitatively new parameter space for exotic Higgs decays, exotic B decays and even direct production of light resonances. We parametrize the physics potential in terms of a singlet scalar mixing with the Standard Model Higgs and an axion-like particle with a coupling to gluons, and review a number or relevant models motivated by the hierarchy and strong CP problems, Dark Matter and baryogenesis.
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- 2021
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6. Detection of light dark matter with optical phonons in polar materials
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Simon Knapen, Tongyan Lin, Matt Pyle, and Kathryn M. Zurek
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Physics ,QC1-999 - Abstract
We show that polar materials are excellent targets for direct detection of sub-GeV dark matter due to the presence of gapped optical phonons as well as acoustic phonons with high sound speed. We take the example of Gallium Arsenide (GaAs), which has the properties needed for experimental realization, and where many results can be estimated analytically. We find GaAs has excellent reach to dark photon absorption, can completely cover the freeze-in benchmark for scattering via an ultralight dark photon, and is competitive with other proposals to detect sub-MeV dark matter scattering off nuclei.
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- 2018
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7. Triggering soft bombs at the LHC
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Simon Knapen, Simone Pagan Griso, Michele Papucci, and Dean J. Robinson
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Hadron-Hadron scattering (experiments) ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract Very high multiplicity, spherically-symmetric distributions of soft particles, with p T ∼ few×100 MeV, may be a signature of strongly-coupled hidden valleys that exhibit long, efficient showering windows. With traditional triggers, such ‘soft bomb’ events closely resemble pile-up and are therefore only recorded with minimum bias triggers at a very low efficiency. We demonstrate a proof-of-concept for a high-level triggering strategy that efficiently separates soft bombs from pile-up by searching for a ‘belt of fire’: a high density band of hits on the innermost layer of the tracker. Seeding our proposed high-level trigger with existing jet, missing transverse energy or lepton hardware-level triggers, we show that net trigger efficiencies of order 10% are possible for bombs of mass several × 100 GeV. We also consider the special case that soft bombs are the result of an exotic decay of the 125 GeV Higgs. The fiducial rate for ‘Higgs bombs’ triggered in this manner is marginally higher than the rate achievable by triggering directly on a hard muon from associated Higgs production.
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- 2017
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8. Machine-Learning Compression for Particle Physics Discoveries.
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Jack H. Collins, Yifeng Huang, Simon Knapen, Benjamin Nachman, and Daniel Whiteson
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- 2022
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9. New Physics Searches at Kaon and Hyperon Factories
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Evgueni Goudzovski, Diego Redigolo, Kohsaku Tobioka, Jure Zupan, Gonzalo Alonso-Álvarez, Daniele S M Alves, Saurabh Bansal, Martin Bauer, Joachim Brod, Veronika Chobanova, Giancarlo D’Ambrosio, Alakabha Datta, Avital Dery, Francesco Dettori, Bogdan A Dobrescu, Babette Döbrich, Daniel Egana-Ugrinovic, Gilly Elor, Miguel Escudero, Marco Fabbrichesi, Bartosz Fornal, Patrick J Fox, Emidio Gabrielli, Li-Sheng Geng, Vladimir V Gligorov, Martin Gorbahn, Stefania Gori, Benjamín Grinstein, Yuval Grossman, Diego Guadagnoli, Samuel Homiller, Matheus Hostert, Kevin J Kelly, Teppei Kitahara, Simon Knapen, Gordan Krnjaic, Andrzej Kupsc, Sandra Kvedaraitė, Gaia Lanfranchi, Danny Marfatia, Jorge Martin Camalich, Diego Martínez Santos, Karim Massri, Patrick Meade, Matthew Moulson, Hajime Nanjo, Matthias Neubert, Maxim Pospelov, Sophie Renner, Stefan Schacht, Marvin Schnubel, Rui-Xiang Shi, Brian Shuve, Tommaso Spadaro, Yotam Soreq, Emmanuel Stamou, Olcyr Sumensari, Michele Tammaro, Jorge Terol-Calvo, Andrea Thamm, Yu-Chen Tung, Dayong Wang, Kei Yamamoto, Robert Ziegler, and HEP, INSPIRE
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new physics ,K: rare decay ,neutral current: flavor changing ,Nuclear Theory ,FOS: Physical sciences ,General Physics and Astronomy ,hyperon: rare decay ,hyperon: branching ratio ,[PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,decay: flavor changing ,High Energy Physics::Experiment ,flavor: violation ,K: branching ratio ,Nuclear Experiment ,Particle Physics - Phenomenology - Abstract
Rare meson decays are among the most sensitive probes of both heavy and light new physics. Among them, new physics searches using kaons benefit from their small total decay widths and the availability of very large datasets. On the other hand, useful complementary information is provided by hyperon decay measurements. We summarize the relevant phenomenological models and the status of the searches in a comprehensive list of kaon and hyperon decay channels. We identify new search strategies for under-explored signatures, and demonstrate that the improved sensitivities from current and next-generation experiments could lead to a qualitative leap in the exploration of light dark sectors., Comment: 108 pages, 25 figures, 9 tables, matches the published version
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- 2022
10. Dark matter direct detection from the single phonon to the nuclear recoil regime
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Brian Campbell-Deem, Simon Knapen, Tongyan Lin, and Ethan Villarama
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High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Physics::Instrumentation and Detectors ,Nuclear Theory ,FOS: Physical sciences ,Nuclear Experiment ,Particle Physics - Phenomenology - Abstract
In most direct detection experiments, the free nuclear recoil description of dark matter scattering breaks down for masses $\lesssim$ 100 MeV, or when the recoil energy is comparable to a few times the typical phonon energy. For dark matter lighter than 1 MeV, scattering via excitation of a single phonon dominates and has been computed previously, but for the intermediate mass range or higher detector thresholds, multiphonon processes dominate. We perform the first calculation of the scattering rate via multiphonon production for the entire keV-GeV dark matter mass range, assuming a harmonic crystal target. We provide an analytic description that connects the single phonon, multiphonon, and the nuclear recoil regimes. Our results are implemented in the public package $\texttt{DarkELF}$., Comment: 28 pages, 16 figures
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- 2022
11. Searching for axionlike particles with data scouting at ATLAS and CMS
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Simon Knapen, Soubhik Kumar, and Diego Redigolo
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Quantum Physics ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Particle and Plasma Physics ,FOS: Physical sciences ,Molecular ,hep-ph ,Nuclear ,Atomic ,Nuclear & Particles Physics ,Astronomical and Space Sciences ,Particle Physics - Phenomenology - Abstract
We investigate the physics case for a dedicated trigger-level analysis for very low mass diphoton resonances at ATLAS and CMS and introduce a new photon isolation criterion. This greatly increases the acceptance for light particles at the expense of a somewhat larger Standard Model background. We show how such an analysis would likely yield new experimental coverage for axion-like particles for masses below 15 GeV, bridging the gap with the region covered by flavor factories., 9 pages, 8 figures
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- 2022
12. PYTHON package for dark matter scattering in dielectric targets
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Simon Knapen, Jonathan Kozaczuk, and Tongyan Lin
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hep-ph ,Particle Physics - Phenomenology - Abstract
We present DarkELF, a python package to calculate interaction rates of light dark matter in dielectric materials, including screening effects. The full response of the material is parametrized in the terms of the energy loss function (ELF) of material, which DarkELF converts into differential scattering rates for both direct dark matter electron scattering and through the Migdal effect. In addition, DarkELF can calculate the rate to produce phonons from sub-MeV dark matter scattering via the dark photon mediator, as well as the absorption rate for dark matter comprised of dark photons. The package includes precomputed ELFs for Al, Al2O3, GaAs, GaN, Ge, Si, SiO2, and ZnS, and allows the user to easily add their own ELF extractions for arbitrary materials. We present a python package to calculate interaction rates of light dark matter in dielectric materials, including screening effects. The full response of the material is parametrized in the terms of the energy loss function (ELF) of material, which darkELF converts into differential scattering rates for both direct dark matter electron scattering and through the Migdal effect. In addition, darkELF can calculate the rate to produce phonons from sub-MeV dark matter scattering via the dark photon mediator, as well as the absorption rate for dark matter comprised of dark photons. The package includes precomputed ELFs for Al, $\mathrm{Al}_2\mathrm{O}_3$, GaAs, GaN, Ge, Si, $\mathrm{SiO}_2$, and ZnS, and allows the user to easily add their own ELF extractions for arbitrary materials.
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- 2021
13. Perturbative benchmark models for a dark shower search program
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Dong Xu, Simon Knapen, and Jessie Shelton
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Physics ,Particle physics ,Meson ,FOS: Physical sciences ,Parton ,hep-ph ,Upper and lower bounds ,Set (abstract data type) ,Range (mathematics) ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Benchmark (computing) ,Higgs boson ,High Energy Physics::Experiment ,Nuclear Experiment ,Phenomenology (particle physics) ,Computer Science::Databases ,Particle Physics - Phenomenology - Abstract
We provide five benchmark hidden valley models with perturbative parton showers, which span a wide range of dark shower phenomenology. We consider production through an $s$-channel, heavy mediator, which can be identified with the SM Higgs. By assuming a set of well-motivated decay portals, one can moreover fix both the branching ratios of the dark mesons and set a lower bound on their lifetime. We provide a public python tool which can be used to generate self-consistent PYTHIA 8 cards for our benchmark models., 17 pages, 10 figures, python code available at https://gitlab.com/simonknapen/dark_showers_tool Journal version. Compared to v1, a conceptual error was corrected related to the interpretation of the pythia hadronization module. Conclusions unchanged
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- 2021
14. Searching for exotic B -meson decays enabled by the CMS L1 track trigger
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Abhijith Gandrakota, J. Evans, Hardik Routray, and Simon Knapen
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Physics ,Particle physics ,Physics::Instrumentation and Detectors ,010308 nuclear & particles physics ,Track (disk drive) ,Nuclear Theory ,Scalar (mathematics) ,Computer Science::Computational Geometry ,01 natural sciences ,Resonance (particle physics) ,0103 physical sciences ,Vertex (curve) ,High Energy Physics::Experiment ,B meson ,Nuclear Experiment ,010306 general physics - Abstract
The CMS phase II track trigger may allow for a displaced dimuon vertex trigger with qualitatively lower pT thresholds than existing dimuon triggers. With this technique, we show that the CMS reach for exotic B-meson decays involving a displaced dimuon resonance, such as a light, Higgs-mixed scalar, can be competitive with that of LHCb and Belle II.
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- 2021
15. Dark matter-electron scattering in dielectrics
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Jonathan Kozaczuk, Simon Knapen, and Tongyan Lin
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Physics ,Scattering ,business.industry ,Scalar (mathematics) ,Dark matter ,FOS: Physical sciences ,hep-ph ,Electron ,Dielectric ,Computational physics ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Semiconductor ,Density functional theory ,business ,Electron scattering ,Particle Physics - Phenomenology - Abstract
A number of direct detection experiments are searching for electron excitations created by scattering of sub-GeV dark matter. We present an alternate formulation of dark matter-electron scattering in terms of the dielectric response of a material. For dark matter which couples to electrons, this approach automatically accounts for in-medium screening effects, which were not included in previous rate calculations for semiconductor targets. We show that the screening effects appear for both scalar and vector mediators. The result is a non-negligible reduction of reach for direct detection experiments which use dielectric materials as targets. We also explore different determinations of the dielectric response, including first-principles density functional theory (DFT) calculations and a data-driven analytic approximation using a Mermin oscillator model., 13 pages, 7 figures
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- 2021
16. Feebly-interacting particles : FIPs 2020 workshop report
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S. Cebrián, Pilar Hernández, Gian F. Giudice, G. Lanfranchi, Jacobo Lopez-Pavon, Mikhail Shaposhnikov, Simon Knapen, Andreas Ringwald, Yu-Dai Tsai, Oleg Ruchayskiy, Julian Heeck, James Baker Beacham, I. G. Irastorza, M. Hostert, S. N. Gninenko, Evgueni Goudzovski, Maurizio Giannotti, Felix Kahlhoefer, Jakob Salfeld-Nebgen, Joshua T. Ruderman, Asher Berlin, Marco Drewes, Joerg Jaeckel, Jocelyn Monroe, H. Russell, Philip Schuster, P. Agrawal, Maxim Pospelov, X. CidVidal, Yevgeny V. Stadnik, David D'Enterria, V. I. Martinez Outschoorn, Yotam Soreq, Kohsaku Tobioka, Silvia Pascoli, Lesya Shchutska, D. Redigolo, Gordan Krnjaic, A. De Roeck, Martin Bauer, Alexey Boyarsky, J. Swallow, S. Gori, A. Izmaylov, J. Shelton, B. Echenard, Agrawal, P, Bauer, M, Beacham, J, Berlin, A, Boyarsky, A, Cebrian, S, Cid-Vidal, X, D'Enterria, D, De Roeck, A, Drewes, M, Echenard, B, Giannotti, M, Giudice, GF, Gninenko, S, Gori, S, Goudzovski, E, Heeck, J, Hernandez, P, Hostert, M, Irastorza, IG, Izmaylov, A, Jaeckel, J, Kahlhoefer, F, Knapen, S, Krnjaic, G, Lanfranchi, G, Monroe, J, Outschoorn, VIM, Lopez-Pavon, J, Pascoli, S, Pospelov, M, Redigolo, D, Ringwald, A, Ruchayskiy, O, Ruderman, J, Russell, H, Salfeld-Nebgen, J, Schuster, P, Shaposhnikov, M, Shchutska, L, Shelton, J, Soreq, Y, Stadnik, Y, Swallow, J, Tobioka, K, and Tsai, YD
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interpretation of experiments: CERN LHC Coll ,CERN Lab ,scale: TeV ,Physics and Astronomy (miscellaneous) ,LEPTON FLAVOR VIOLATION ,Physics beyond the Standard Model ,PROTON-PROTON COLLISIONS ,Dark matter ,FOS: Physical sciences ,MODEL CP-VIOLATION ,QC770-798 ,dark matter: direct detection ,SOLAR AXION SEARCHES ,Astrophysics ,01 natural sciences ,law.invention ,High Energy Physics - Phenomenology (hep-ph) ,ELECTROWEAK PHASE-TRANSITION ,law ,COHERENT PRIMAKOFF CONVERSION ,VECTOR GAUGE BOSON ,Nuclear and particle physics. Atomic energy. Radioactivity ,0103 physical sciences ,TeV [scale] ,Particle theory, particle phenomenology, Dark sector ,ddc:530 ,Beam dump ,010306 general physics ,Collider ,Engineering (miscellaneous) ,direct detection [dark matter] ,Particle Physics - Phenomenology ,Physics ,LEFT-RIGHT SYMMETRY ,Large Hadron Collider ,new physics ,010308 nuclear & particles physics ,hep-ph ,Data science ,QB460-466 ,High Energy Physics - Phenomenology ,NEUTRAL HEAVY-LEPTONS ,axion ,CERN LHC Coll [interpretation of experiments] ,beam dump ,Neutrino ,experimental results ,BARYON-NUMBER NONCONSERVATION - Abstract
The European physical journal / C 81(11), 1015 (2021). doi:10.1140/epjc/s10052-021-09703-7, With the establishment and maturation of the experimental programs searching for new physics with sizeable couplings at the LHC, there is an increasing interest in the broader particle and astrophysics community for exploring the physics of light and feebly-interacting particles as a paradigm complementary to a New Physics sector at the TeV scale and beyond. FIPs 2020 has been the first workshop fully dedicated to the physics of feebly-interacting particles and was held virtually from 31 August to 4 September 2020. The workshop has gathered together experts from collider, beam dump, fixed target experiments, as well as from astrophysics, axions/ALPs searches, current/future neutrino experiments, and dark matter direct detection communities to discuss progress in experimental searches and underlying theory models for FIPs physics, and to enhance the cross-fertilisation across different fields. FIPs 2020 has been complemented by the topical workshop ���Physics Beyond Colliders meets theory���, held at CERN from 7 June to 9 June 2020. This document presents the summary of the talks presented at the workshops and the outcome of the subsequent discussions held immediately after. It aims to provide a clear picture of this blooming field and proposes a few recommendations for the next round of experimental results., Published by Springer, Heidelberg
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- 2021
17. Expression of interest for the CODEX-b detector
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Paul Nathaniel Swallow, George Gibbons, Raphael Dumps, Saul López Soliño, Jongho Lee, Riccardo Vari, Roberto Cardarelli, Simon Knapen, H. Schindler, Michele Papucci, Dean J. Robinson, Mike Williams, Biplab Dey, Giulio Aielli, E. Ben-Haim, Olivier Le Dortz, Vladimir Gligorov, Jared A. Evans, Nigel Watson, Philip Ilten, Matthew Charles, Benjamin Nachman, Francesco Polci, Xabier Cid Vidal, Harikrishnan Ramani, Robin Quessard, Michael Sokoloff, Victor Coco, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), 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), Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), and Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
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Physics and Astronomy (miscellaneous) ,Physics::Instrumentation and Detectors ,Tracking (particle physics) ,01 natural sciences ,Atomic ,High Energy Physics - Experiment ,shielding: design ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology (hep-ph) ,Particle and Plasma Physics ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,Physics ,Quantum Physics ,Large Hadron Collider ,Detector ,hep-ph ,Nuclear & Particles Physics ,High Energy Physics - Phenomenology ,CERN LHC Coll ,Electromagnetic shielding ,axion-like particles ,proposed experiment ,numerical calculations: Monte Carlo ,Particle Physics - Experiment ,p p: scattering ,FOS: Physical sciences ,lcsh:Astrophysics ,lcsh:QB460-466 ,0103 physical sciences ,Electronic engineering ,Calibration ,calorimeter ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,Nuclear ,010306 general physics ,Engineering (miscellaneous) ,detector: design ,Particle Physics - Phenomenology ,Calorimeter (particle physics) ,010308 nuclear & particles physics ,background ,hep-ex ,Molecular ,gluon ,calibration ,LHC-B ,Expression (mathematics) ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,lcsh:QC770-798 ,particle: long-lived ,Event (particle physics) ,p p: colliding beams ,experimental results - Abstract
This document presents the physics case and ancillary studies for the proposed CODEX-b long-lived particle (LLP) detector, as well as for a smaller proof-of-concept demonstrator detector, CODEX-$\beta$, to be operated during Run 3 of the LHC. Our development of the CODEX-b physics case synthesizes `top-down' and `bottom-up' theoretical approaches, providing a detailed survey of both minimal and complete models featuring LLPs. Several of these models have not been studied previously, and for some others we amend studies from previous literature: In particular, for gluon and fermion-coupled axion-like particles. We moreover present updated simulations of expected backgrounds in CODEX-b's actively shielded environment, including the effects of shielding propagation uncertainties, high-energy tails and variation in the shielding design. Initial results are also included from a background measurement and calibration campaign. A design overview is presented for the CODEX-$\beta$ demonstrator detector, which will enable background calibration and detector design studies. Finally, we lay out brief studies of various design drivers of the CODEX-b experiment and potential extensions of the baseline design, including the physics case for a calorimeter element, precision timing, event tagging within LHCb, and precision low-momentum tracking., Comment: 99 pages, 36 figures. Journal version
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- 2020
18. Probing naturally light singlets with a displaced vertex trigger
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Diego Redigolo, Simon Knapen, and Yuri Gershtein
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Physics ,Nuclear and High Energy Physics ,Particle physics ,Large Hadron Collider ,QC1-999 ,Scalar (mathematics) ,Hadron ,High Energy Physics::Phenomenology ,FOS: Physical sciences ,hep-ph ,Standard Model ,Vertex (geometry) ,Gluon ,Baryogenesis ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Higgs boson ,High Energy Physics::Experiment ,Particle Physics - Phenomenology - Abstract
We investigate the physics case for a dedicated trigger on a low mass, hadronic displaced vertex at the high luminosity LHC, relying on the CMS phase II track trigger. We estimate the trigger efficiency with a simplified simulation of the CMS track trigger and show that the L1 trigger rate from fake vertices, B meson decays and secondary interactions with the detector material can likely be brought down to the kHz level with a minimal set of cuts. While it would with any doubt be a severe experimental challenge to implement, we conclude that a displaced vertex trigger could open qualitatively new parameter space for exotic Higgs decays, exotic B decays and even direct production of light resonances. We parametrize the physics potential in terms of a singlet scalar mixing with the Standard Model Higgs and an axion-like particle with a coupling to gluons, and review a number or relevant models motivated by the hierarchy and strong CP problems, dark matter and baryogenesis., 18 pages, 8 figures
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- 2020
19. The Migdal effect in semiconductors
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Jonathan Kozaczuk, Tongyan Lin, and Simon Knapen
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Physics ,Condensed matter physics ,Scattering ,business.industry ,hep-ex ,Dark matter ,Nuclear Theory ,General Physics and Astronomy ,hep-ph ,Function (mathematics) ,Electron ,Semiconductor ,Excited state ,Atom ,Density functional theory ,business ,Particle Physics - Experiment ,Particle Physics - Phenomenology - Abstract
When a nucleus in an atom undergoes a collision, there is a small probability of an electron being excited inelastically as a result of the Migdal effect. In this Letter, we present the first complete derivation of the Migdal effect from dark matter-nucleus scattering in semiconductors, which also accounts for multiphonon production. The rate of the Migdal effect can be expressed in terms of the energy loss function of the material, which we calculate with density functional theory methods. Because of the smaller gap for electron excitations, we find that the rate for the Migdal effect is much higher in semiconductors than in atomic targets. Accounting for the Migdal effect in semiconductors can therefore significantly improve the sensitivity of experiments such as DAMIC, SENSEI, and SuperCDMS to sub-GeV dark matter. When a nucleus in an atom undergoes a collision, there is a small probability to inelastically excite an electron as a result of the Migdal effect. In this Letter, we present a first complete derivation of the Migdal effect from dark matter-nucleus scattering in semiconductors, which also accounts for multiphonon production. The rate can be expressed in terms of the energy loss function of the m
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- 2020
20. Erratum: Multiphonon excitations from dark matter scattering in crystals [Phys. Rev. D 101 , 036006 (2020)]
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Simon Knapen, Brian Campbell-Deem, Peter Timothy Cox, Tom Melia, and Tongyan Lin
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Physics ,Condensed matter physics ,Scattering ,Dark matter - Published
- 2020
21. Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider
- Author
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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
22. Long-lived particles at the energy frontier: the MATHUSLA physics case
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Michael E. Peskin, Timothy Cohen, Raymond T. Co, Andrew Spray, J. C. Arteaga-Velázquez, Emmanuel Olaiya, Brian Shuve, Marco Drewes, Csaba Csáki, Yongchao Zhang, Simon Knapen, Rabindra N. Mohapatra, Rouven Essig, Karen S. Caballero-Mora, Tony Gherghetta, Bryan Zaldivar, Jose Miguel No, Jessie Shelton, Juan Carlos Helo, Francesco D'Eramo, Matthias Schlaffer, Anson Hook, David Pinner, Luigi Delle Rose, Eung Jin Chun, Jared A. Evans, Matthias Neubert, David McKeen, Patrick Meade, Philip Harris, Sunghoon Jung, Rajat Gupta, Stephen M. West, Martin A. Subieta Vasquez, Jeff A. Dror, Maxim Pospelov, Thomas Flacke, Elena Accomando, Matthew Reece, Stefano Moretti, Felix Yu, Anthony Fradette, Dean J. Robinson, Natsumi Nagata, Seyda Ipek, Arturo Fernandez Tellez, Claire H. Shepherd-Themistocleous, Peter Cox, Brian Batell, Martin Hirsch, David Curtin, Stefan Antusch, Gilad Perez, Dmitry Gorbunov, Kathryn M. Zurek, Raman Sundrum, R. Santonico, Cristiano Alpigiani, Zhen Liu, Alejandro Ibarra, Andrea Thamm, Mario Rodriguez Cahuantzi, Yanou Cui, Jae Hyeok Chang, Lawrence J. Hall, Emiliano Molinaro, Henry Lubatti, Jason L. Evans, Oliver Fischer, Gian F. Giudice, Martin Bauer, José Zurita, Nikita Blinov, Daniel Stolarski, Brock Tweedie, Claudia Hagedorn, Brooks Thomas, P. S. Bhupal Dev, Yuhsin Tsai, Eric Kuflik, Matthew McCullough, Nathaniel Craig, Keith R. Dienes, Charles Young, Salvator Lombardo, Claudia Frugiuele, Elina Fuchs, Yonit Hochberg, Laboratoire d'Annecy-le-Vieux de Physique Théorique (LAPTH), and Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)
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Physics::Instrumentation and Detectors ,Physics beyond the Standard Model ,HEAVY MAJORANA NEUTRINOS ,General Physics and Astronomy ,01 natural sciences ,Mathematical Sciences ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology (hep-ph) ,Naturalness ,CERN LHC Coll: upgrade ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,neutrino: mass ,long-lived particles ,Physics ,Large Hadron Collider ,new physics ,CMS ,hierarchy problem ,neutrinos ,Hierarchy problem ,hep-ph ,ATLAS ,DARK-MATTER SEARCHES ,COSMIC-RAYS ,missing-energy ,High Energy Physics - Phenomenology ,Physical Sciences ,Neutrino ,LIGHT HIGGS-BOSON ,Particle Physics - Experiment ,Particle physics ,General Physics ,STERILE NEUTRINOS ,PHI-MESON DECAYS ,nucleosynthesis: big bang ,Dark matter ,FOS: Physical sciences ,EXTENSIVE AIR-SHOWERS ,dark matter ,VECTOR GAUGE BOSON ,0103 physical sciences ,010306 general physics ,numerical calculations ,Particle Physics - Phenomenology ,LEFT-RIGHT SYMMETRY ,Missing energy ,hep-ex ,background ,Baryogenesis ,dark matter: detector ,trigger ,sensitivity ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,simplified models ,DOUBLE-BETA DECAY ,particle: long-lived - Abstract
We examine the theoretical motivations for long-lived particle (LLP) signals at the LHC in a comprehensive survey of Standard Model (SM) extensions. LLPs are a common prediction of a wide range of theories that address unsolved fundamental mysteries such as naturalness, dark matter, baryogenesis and neutrino masses, and represent a natural and generic possibility for physics beyond the SM (BSM). In most cases the LLP lifetime can be treated as a free parameter from the $\mu$m scale up to the Big Bang Nucleosynthesis limit of $\sim 10^7$m. Neutral LLPs with lifetimes above $\sim$ 100m are particularly difficult to probe, as the sensitivity of the LHC main detectors is limited by challenging backgrounds, triggers, and small acceptances. MATHUSLA is a proposal for a minimally instrumented, large-volume surface detector near ATLAS or CMS. It would search for neutral LLPs produced in HL-LHC collisions by reconstructing displaced vertices (DVs) in a low-background environment, extending the sensitivity of the main detectors by orders of magnitude in the long-lifetime regime. In this white paper we study the LLP physics opportunities afforded by a MATHUSLA-like detector at the HL-LHC. We develop a model-independent approach to describe the sensitivity of MATHUSLA to BSM LLP signals, and compare it to DV and missing energy searches at ATLAS or CMS. We then explore the BSM motivations for LLPs in considerable detail, presenting a large number of new sensitivity studies. While our discussion is especially oriented towards the long-lifetime regime at MATHUSLA, this survey underlines the importance of a varied LLP search program at the LHC in general. By synthesizing these results into a general discussion of the top-down and bottom-up motivations for LLP searches, it is our aim to demonstrate the exceptional strength and breadth of the physics case for the construction of the MATHUSLA detector., Comment: 213 pages, 73 figures. Extended Section 2 to add more detailed discussion of LLP reconstruction and analysis, and background rejection. Updated comparison of MATHUSLA RH neutrino sensitivity to other experiments. Updated analysis of long-lived ALPs produced in weak-scale processes and decaying to jets. Various clarifications, fixed typos, and added references. Results and conclusions unchanged
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- 2019
23. Trigger strategy for displaced muon pairs following the CMS phase II upgrades
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Simon Knapen and Yuri Gershtein
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Physics ,Particle physics ,Muon ,Trigger strategy ,010308 nuclear & particles physics ,Physics::Instrumentation and Detectors ,hep-ex ,Phase (waves) ,A moderate amount ,hep-ph ,Tracking (particle physics) ,Computer Science::Digital Libraries ,01 natural sciences ,0103 physical sciences ,High Energy Physics::Experiment ,010306 general physics ,Low Mass ,Energy (signal processing) ,Particle Physics - Experiment ,Particle Physics - Phenomenology - Abstract
We show that the phase II upgrade of the CMS tracking detector could enable the experiment to trigger on very low mass O(1 GeV) displaced muon pairs with minimal pT cuts. As a result, CMS can be competitive with LHCb when searching for low mass displaced exotics originating from heavy flavor decays. The method can also be applied to signatures without muons but with a moderate amount of missing transverse energy, HT or multiple displaced vertices in the event. We show that the phase II upgrade of the CMS tracking detector could enable the experiment to trigger on very low mass $\mathcal{O}(1\,\text{GeV})$ displaced muon pairs with minimal $p_T$ cuts. As a result, CMS can be competitive with LHCb when searching for low mass displaced exotics originating from heavy flavor decays. The method can also be applied to signatures without muons but with a moderate amount of MET, $H_T$ or multiple displaced vertices in the event.
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- 2019
24. Leveraging the ALICE/L3 cavern for long-lived particle searches
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Benjamin Philip Nachman, Vladimir Gligorov, Simon Knapen, Dean J. Robinson, Michele Papucci, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), and 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)
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Particle physics ,Higgs particle: decay ,Physics beyond the Standard Model ,01 natural sciences ,Particle identification ,ALICE ,0103 physical sciences ,CERN LHC Coll: upgrade ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,Sensitivity (control systems) ,010306 general physics ,numerical calculations ,Event reconstruction ,Physics ,Luminosity (scattering theory) ,Time projection chamber ,Large Hadron Collider ,Interaction point ,010308 nuclear & particles physics ,new physics ,background ,pi: decay ,B: decay ,sensitivity ,LHC-B ,time projection chamber ,Beyond the standard model ,eta: decay ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,vertex: primary ,luminosity: high ,particle: long-lived ,particle identification - Abstract
Run 5 of the high-luminosity LHC era (and beyond) may provide new opportunities to search for physics beyond the standard model at interaction point 2. In particular, taking advantage of the existing ALICE detector and infrastructure provides an opportunity to search for displaced decays of beyond standard model long-lived particles. While this proposal may well be preempted by ongoing ALICE physics goals, examination of its potential new physics reach provides a compelling comparison with respect to other long-lived particle proposals. In particular, full event reconstruction and particle identification could be possible by making use of the existing L3 magnet and ALICE time projection chamber. For several well-motivated portals, the reach competes with or exceeds the sensitivity of MATHUSLA and SHiP, provided that a total integrated luminosity of approximately 100 fb−1 could be delivered to interaction point 2.
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- 2019
25. Directional detection of light dark matter with polar materials
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Simon Knapen, Sinéad M. Griffin, Kathryn M. Zurek, and Tongyan Lin
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Scalar (mathematics) ,Dark matter ,FOS: Physical sciences ,Atomic ,01 natural sciences ,7. Clean energy ,Dark photon ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,Particle and Plasma Physics ,High Energy Physics - Phenomenology (hep-ph) ,0103 physical sciences ,Nuclear ,010306 general physics ,Light dark matter ,Particle Physics - Phenomenology ,Physics ,Quantum Physics ,Condensed Matter - Materials Science ,hep-ex ,010308 nuclear & particles physics ,Scattering ,Molecular ,Materials Science (cond-mat.mtrl-sci) ,hep-ph ,Nuclear & Particles Physics ,cond-mat.mtrl-sci ,High Energy Physics - Phenomenology ,Sapphire ,Polar ,Density functional theory ,Atomic physics ,Astronomical and Space Sciences ,Particle Physics - Experiment - Abstract
We consider the direct detection of dark matter (DM) with polar materials, where single production of optical or acoustic phonons gives excellent reach to scattering of sub-MeV DM for both scalar and vector mediators. Using Density Functional Theory (DFT), we calculate the material-specific matrix elements, focusing on GaAs and sapphire, and show that DM scattering in an anisotropic crystal such as sapphire features a strong directional dependence. For example, for a DM candidate with mass 40 keV and relic abundance set by freeze-in, the daily modulation in the interaction rate can be established at 90\% C.L. with a gram-year of exposure. Non-thermal dark photon DM in the meV - eV mass range can also be effectively absorbed in polar materials., 48 pages, 17 figures. Has animated content which requires Adobe Acrobat reader
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- 2018
26. Searching for Long-lived Particles: A Compact Detector for Exotics at LHCb
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Michele Papucci, Dean J. Robinson, Vladimir Gligorov, Simon Knapen, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), 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)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Laboratoire de Physique Nucléaire et de Hautes Énergies ( LPNHE ), and Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS )
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Particle physics ,Meson ,compact ,Higgs particle: mixing ,Higgs particle: decay ,Physics::Instrumentation and Detectors ,Physics beyond the Standard Model ,Hadron ,FOS: Physical sciences ,Elementary particle ,01 natural sciences ,Atomic ,Standard Model ,High Energy Physics - Experiment ,Nuclear physics ,High Energy Physics - Experiment (hep-ex) ,Particle and Plasma Physics ,High Energy Physics - Phenomenology (hep-ph) ,benchmark ,[ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex] ,0103 physical sciences ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,B meson ,Nuclear ,vertex ,010306 general physics ,Particle Physics - Phenomenology ,Physics ,Quantum Physics ,Large Hadron Collider ,detector ,010308 nuclear & particles physics ,hep-ex ,new physics ,Molecular ,B: decay ,hep-ph ,Nuclear & Particles Physics ,LHC-B ,High Energy Physics - Phenomenology ,CERN LHC Coll ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,Higgs boson ,[ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,High Energy Physics::Experiment ,particle: long-lived ,Astronomical and Space Sciences ,Particle Physics - Experiment - Abstract
We advocate for the construction of a new detector element at the LHCb experiment, designed to search for displaced decays of beyond standard model long-lived particles, taking advantage of a large shielded space in the LHCb cavern that is expected to soon become available. We discuss the general features and putative capabilities of such an experiment, as well as its various advantages and complementarities with respect to the existing LHC experiments and proposals such as SHiP and MATHUSLA. For two well-motivated beyond Standard Model benchmark scenarios -- Higgs decay to dark photons and $B$ meson decays via a Higgs mixing portal -- the reach either complements or exceeds that predicted for other LHC experiments., 12 pages, 8 figures, 2 tables; published version
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- 2018
27. Direct Detection of Bound States of Asymmetric Dark Matter
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Kathryn M. Zurek, Ahmet Coskuner, Dorota M. Grabowska, and Simon Knapen
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Physics ,Superconductivity ,010308 nuclear & particles physics ,Point particle ,Phonon ,Dark matter ,FOS: Physical sciences ,hep-ph ,01 natural sciences ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,13. Climate action ,0103 physical sciences ,Bound state ,Atomic physics ,010306 general physics ,Nucleon ,Superfluid helium-4 ,Excitation ,Particle Physics - Phenomenology - Abstract
We study the reach of direct detection experiments for large bound states (containing $10^4$ or more dark nucleons) of Asymmetric Dark Matter. We consider ordinary nuclear recoils, excitation of collective modes (phonons), and electronic excitations, paying careful attention to the impact of the energy threshold of the experiment. Large exposure experiments with keV energy thresholds provide the best (future) limits when the Dark Matter is small enough to be treated as a point particle, but rapidly lose sensitivity for more extended dark bound states, or when the mediator is light. In those cases, low threshold, low exposure experiments (such as with a superfluid helium, polar material or superconducting target) are often more sensitive due to coherent enhancement over the dark nucleons. We also discuss indirect constraints on composite Asymmetric Dark Matter arising from self-interaction, formation history and the properties of the composite states themselves., Comment: 43 pages, 9 figures
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- 2018
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28. Tracking down quirks at the Large Hadron Collider
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Michele Papucci, Jack Setford, Hou Keong Lou, and Simon Knapen
- Subjects
Physics ,Particle physics ,Photon ,Large Hadron Collider ,Physics::Instrumentation and Detectors ,010308 nuclear & particles physics ,Electroweak interaction ,FOS: Physical sciences ,Tracking (particle physics) ,01 natural sciences ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,medicine.anatomical_structure ,Atlas (anatomy) ,0103 physical sciences ,medicine ,C++ string handling ,010306 general physics ,Signature (topology) - Abstract
Non-helical tracks are the smoking gun signature of charged and/or colored quirks, which are pairs of particles bound by a new, long-range confining force. We propose a method to efficiently search for these non-helical tracks at the LHC, without the need to fit their trajectories. We show that the hits corresponding to quirky trajectories can be selected efficiently by searching for co-planar hits in the inner layers of the ATLAS and CMS trackers, even in the presence of on average 50 pile-up vertices. We further argue that backgrounds from photon conversions and unassociated pile-up hits can be removed almost entirely, while maintaining a signal reconstruction efficiency as high as 70%. With the 300 fb$^{-1}$ dataset, this implies a discovery potential for string tension between 100 eV and 30 keV, and colored (electroweak charged) quirks as heavy as 1600 (650) GeV may be discovered., 9 pages, 10 figures, submitted to PRD, minor changes
- Published
- 2017
29. Detection of Light Dark Matter With Optical Phonons in Polar Materials
- Author
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Kathryn M. Zurek, Simon Knapen, Tongyan Lin, and Matt Pyle
- Subjects
Nuclear and High Energy Physics ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Phonon ,Dark matter ,FOS: Physical sciences ,01 natural sciences ,Molecular physics ,Dark photon ,Gallium arsenide ,High Energy Physics - Experiment ,chemistry.chemical_compound ,High Energy Physics - Experiment (hep-ex) ,Condensed Matter::Materials Science ,High Energy Physics - Phenomenology (hep-ph) ,Speed of sound ,0103 physical sciences ,010306 general physics ,Absorption (electromagnetic radiation) ,Nuclear Experiment ,Light dark matter ,Physics ,010308 nuclear & particles physics ,Scattering ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,lcsh:QC1-999 ,High Energy Physics - Phenomenology ,chemistry ,lcsh:Physics ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We show that polar materials are excellent targets for direct detection of sub-GeV dark matter due to the presence of gapped optical phonons as well as acoustic phonons with high sound speed. We take the example of Gallium Arsenide (GaAs), which has the properties needed for experimental realization, and where many results can be estimated analytically. We find GaAs has excellent reach to dark photon absorption, can completely cover the freeze-in benchmark for scattering via an ultralight dark photon, and is competitive with other proposals to detect sub-MeV dark matter scattering off nuclei., 5 pages, 4 figures. Matches journal version
- Published
- 2017
30. Light dark matter in superfluid helium: Detection with multi-excitation production
- Author
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Kathryn M. Zurek, Simon Knapen, and Tongyan Lin
- Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Physics - Instrumentation and Detectors ,Dark matter ,FOS: Physical sciences ,Roton ,01 natural sciences ,7. Clean energy ,Atomic ,High Energy Physics - Experiment ,Nuclear physics ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology (hep-ph) ,Particle and Plasma Physics ,0103 physical sciences ,Nuclear ,Nuclear Experiment ,010306 general physics ,Light dark matter ,Physics ,Quantum Physics ,010308 nuclear & particles physics ,Molecular ,Instrumentation and Detectors (physics.ins-det) ,Nuclear & Particles Physics ,High Energy Physics - Phenomenology ,Atomic physics ,Excitation ,Superfluid helium-4 ,Astronomical and Space Sciences ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We examine in depth a recent proposal to utilize superfluid helium for direct detection of sub-MeV mass dark matter. For sub-keV recoil energies, nuclear scattering events in liquid helium primarily deposit energy into long-lived phonon and roton quasiparticle excitations. If the energy thresholds of the detector can be reduced to the meV scale, then dark matter as light as ~MeV can be reached with ordinary nuclear recoils. If, on the other hand, two or more quasiparticle excitations are directly produced in the dark matter interaction, the kinematics of the scattering allows sensitivity to dark matter as light as ~keV at the same energy resolution. We present in detail the theoretical framework for describing excitations in superfluid helium, using it to calculate the rate for the leading dark matter scattering interaction, where an off-shell phonon splits into two or more higher-momentum excitations. We validate our analytic results against the measured and simulated dynamic response of superfluid helium. Finally, we apply this formalism to the case of a kinetically mixed hidden photon in the superfluid, both with and without an external electric field to catalyze the processes., 43 pages, 10 figures
- Published
- 2017
31. Gauge mediation at the LHC: status and prospects
- Author
-
Diego Redigolo, Simon Knapen, Berkeley Center for Theoretical Physics (CTP), University of California [Berkeley], University of California-University of California, Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), University of California [Berkeley] (UC Berkeley), and University of California (UC)-University of California (UC)
- Subjects
Nuclear and High Energy Physics ,Particle physics ,FOS: Physical sciences ,01 natural sciences ,Upper and lower bounds ,Mathematical Sciences ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology (hep-ph) ,0103 physical sciences ,Invariant mass ,Higgsino ,010306 general physics ,Physics ,Gluino ,Large Hadron Collider ,010308 nuclear & particles physics ,High Energy Physics::Phenomenology ,Superpartner ,Nuclear & Particles Physics ,High Energy Physics - Phenomenology ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,Physical Sciences ,Neutralino ,Higgs boson ,High Energy Physics::Experiment - Abstract
We show that the predictivity of general gauge mediation (GGM) with TeV-scale stops is greatly increased once the Higgs mass constraint is imposed. The most notable results are a strong lower bound on the mass of the gluino and right-handed squarks, and an upper bound on the Higgsino mass. If the mu-parameter is positive, the wino mass is also bounded from above. These constraints relax significantly for high messenger scales and as such long-lived NLSPs are favored in GGM. We identify a small set of most promising topologies for the neutralino/sneutrino NLSP scenarios and estimate the impact of the current bounds and the sensitivity of the high luminosity LHC. The stau, stop and sbottom NLSP scenarios can be robustly excluded at the high luminosity LHC., Published version. 42 pages, 20 figures, LEP bounds revised and appendix added with a discussion of compressed spectra
- Published
- 2017
32. Triggering Soft Bombs at the LHC
- Author
-
Dean J. Robinson, Simone Pagan Griso, Michele Papucci, and Simon Knapen
- Subjects
Nuclear and High Energy Physics ,Particle physics ,FOS: Physical sciences ,Jet (particle physics) ,High multiplicity ,01 natural sciences ,Atomic ,Mathematical Sciences ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology (hep-ph) ,Minimum bias ,Particle and Plasma Physics ,Hadron-Hadron scattering (experiments) ,0103 physical sciences ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,Nuclear ,010306 general physics ,Mathematical Physics ,Physics ,Quantum Physics ,Large Hadron Collider ,Muon ,010308 nuclear & particles physics ,hep-ex ,Molecular ,hep-ph ,Nuclear & Particles Physics ,Hadron-Hadron scattering ,High Energy Physics - Phenomenology ,Physical Sciences ,Higgs boson ,lcsh:QC770-798 ,High Energy Physics::Experiment ,Lepton - Abstract
Very high multiplicity, spherically-symmetric distributions of soft particles, with $p_T$ ~ few hundred MeV, may be a signature of strongly-coupled hidden valleys that exhibit long, efficient showering windows. With traditional triggers, such "soft bomb" events closely resemble pile-up and are therefore only recorded with minimum bias triggers at a very low efficiency. We demonstrate a proof-of-concept for a high-level triggering strategy that efficiently separates soft bombs from pile-up by searching for a "belt of fire": A high density band of hits on the innermost layer of the tracker. Seeding our proposed high-level trigger with existing jet, missing transverse energy or lepton hardware-level triggers, we show that net trigger efficiencies of order 10% are possible for bombs of mass several hundred GeV. We also consider the special case that soft bombs are the result of an exotic decay of the 125 GeV Higgs. The fiducial rate for "Higgs bombs" triggered in this manner is marginally higher than the rate achievable by triggering directly on a hard muon from associated Higgs production., 38 pages, 5 tables, 14 figures
- Published
- 2016
33. Diphotons from electroweak triplet-singlet mixing
- Author
-
Kiel Howe, Dean J. Robinson, and Simon Knapen
- Subjects
Physics ,Particle physics ,Large Hadron Collider ,010308 nuclear & particles physics ,Physics beyond the Standard Model ,High Energy Physics::Phenomenology ,Electroweak interaction ,Parameter space ,01 natural sciences ,Pseudoscalar ,Nuclear physics ,Cascade ,0103 physical sciences ,Singlet state ,010306 general physics ,Boson - Abstract
The neutral component of a real pseudoscalar electroweak (EW) triplet can produce a diphoton excess at 750 GeV, if it is somewhat mixed with an EW singlet pseudoscalar. This triplet-singlet mixing allows for greater freedom in the diboson branching ratios than the singlet-only case, but it is still possible to probe the parameter space extensively with $300\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. The charged component of the triplet is pair produced at the LHC, which results in a striking signal in the form of a pair of $W\ensuremath{\gamma}$ resonances with an irreducible rate of 0.27 fb. Other signatures include multiboson final states from cascade decays of the triplet-singlet neutral states. A large class of composite models feature both EW singlet and triplet pseudo-Nambu-Goldstone bosons in their spectrum, with the diboson couplings generated by axial anomalies.
- Published
- 2016
34. Gamma-rays from dark showers with twin Higgs models
- Author
-
Dean J. Robinson, Yuhsin Tsai, Marat Freytsis, and Simon Knapen
- Subjects
Global Symmetries ,Particle physics ,Nuclear and High Energy Physics ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Physics beyond the Standard Model ,Dark matter ,FOS: Physical sciences ,Elementary particle ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Atomic ,Mathematical Sciences ,Particle decay ,High Energy Physics - Phenomenology (hep-ph) ,Particle and Plasma Physics ,WIMP ,0103 physical sciences ,Nuclear ,010306 general physics ,Mathematical Physics ,Physics ,Quantum Physics ,010308 nuclear & particles physics ,Electroweak interaction ,Molecular ,Cosmology of Theories beyond the SM ,Nuclear & Particles Physics ,Massless particle ,High Energy Physics - Phenomenology ,Physical Sciences ,Beyond Standard Model ,High Energy Physics::Experiment ,Astrophysics - Cosmology and Nongalactic Astrophysics ,Fermi Gamma-ray Space Telescope - Abstract
We consider a twin WIMP scenario whose twin sector contains a full dark copy of the SM hadrons, where the lightest twin particles are twin pions. By analogy to the standard WIMP paradigm, the dark matter (DM) freezes out through twin electroweak interactions, and annihilates into a dark shower of light twin hadrons. These are either stable or decay predominantly to standard model (SM) photons. We show that this 'hadrosymmetric' scenario can be consistent with all applicable astrophysical, cosmological and collider constraints. In order to decay the twin hadrons before the big-bang nucleosynthesis epoch, an additional portal between the SM and twin sector is required. In most cases we find this additional mediator is within reach of either the LHC or future intensity frontier experiments. Furthermore, we conduct simulations of the dark shower and consequent photon spectra. We find that fits of these spectra to the claimed galactic center gamma-ray excess seen by Fermi-LAT non-trivially coincide with regions of parameter space that both successfully generate the observed DM abundance and exhibit minimal fine-tuning., Comment: 45 pages, 11 figures, v2: journal version, extended discussions in Secs. III-V, references added
- Published
- 2016
35. Gauge mediated mini-split
- Author
-
Nathaniel Craig, Timothy Cohen, and Simon Knapen
- Subjects
Nuclear and High Energy Physics ,Particle physics ,FOS: Physical sciences ,Atomic ,01 natural sciences ,Mathematical Sciences ,High Energy Physics::Theory ,Particle and Plasma Physics ,High Energy Physics - Phenomenology (hep-ph) ,0103 physical sciences ,Nuclear ,Symmetry breaking ,010306 general physics ,Mathematical Physics ,Physics ,Quantum Physics ,Split supersymmetry ,Large Hadron Collider ,010308 nuclear & particles physics ,High Energy Physics::Phenomenology ,Electroweak interaction ,Gaugino ,Molecular ,Nuclear & Particles Physics ,High Energy Physics - Phenomenology ,Supersymmetry Phenomenology ,Physical Sciences ,Higgs boson ,High Energy Physics::Experiment ,Gravitino ,Anomaly (physics) - Abstract
We propose a simple model of split supersymmetry from gauge mediation. This model features gauginos that are parametrically a loop factor lighter than scalars, accommodates a Higgs boson mass of 125 GeV, and incorporates a simple solution to the $\mu-b_\mu$ problem. The gaugino mass suppression can be understood as resulting from collective symmetry breaking. Imposing collider bounds on $\mu$ and requiring viable electroweak symmetry breaking implies small $a$-terms and small $\tan \beta$ -- the stop mass ranges from $10^5$ to $10^8 \mbox{ GeV}$. In contrast with models with anomaly + gravity mediation (which also predict a one-loop loop suppression for gaugino masses), our gauge mediated scenario predicts aligned squark masses and a gravitino LSP. Gluinos, electroweakinos and Higgsinos can be accessible at the LHC and/or future colliders for a wide region of the allowed parameter space., Comment: 16 pages, 1 figure. Journal version, references added
- Published
- 2016
36. Searching for axion-like particles with ultra-peripheral heavy-ion collisions
- Author
-
Tongyan Lin, Hou Keong Lou, Tom Melia, and Simon Knapen
- Subjects
Physics ,Range (particle radiation) ,Particle physics ,Luminosity (scattering theory) ,Photon ,Large Hadron Collider ,010308 nuclear & particles physics ,Physics::Instrumentation and Detectors ,Physics beyond the Standard Model ,Detector ,High Energy Physics::Phenomenology ,General Physics and Astronomy ,FOS: Physical sciences ,01 natural sciences ,High Energy Physics - Experiment ,Ion ,Nuclear physics ,High Energy Physics - Phenomenology ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology (hep-ph) ,0103 physical sciences ,Heavy ion ,High Energy Physics::Experiment ,010306 general physics ,Nuclear Experiment - Abstract
We show that ultra-peripheral heavy-ion collisions at the LHC can be used to search for axion-like particles with mass below 100 GeV. The $Z^4$ enhanced photon-photon luminosity from the ions provides a large exclusive production rate, with a signature of a resonant pair of back-to-back photons and no other activity in the detector. In addition, we present both new and updated limits from recasting multi-photon searches at LEP II and the LHC, which are more stringent than those currently in the literature for the mass range 100 MeV to 100 GeV., Comment: 4 pages, 4 figures; v2 journal version
- Published
- 2016
- Full Text
- View/download PDF
37. The Vector-like Twin Higgs
- Author
-
Simon Knapen, Matthew J. Strassler, Pietro Longhi, and Nathaniel Craig
- Subjects
Global Symmetries ,Nuclear and High Energy Physics ,Particle physics ,Mathematics::General Mathematics ,High Energy Physics::Lattice ,FOS: Physical sciences ,Discrete Symmetries ,Atomic ,01 natural sciences ,Mathematical Sciences ,Subatomär fysik ,Fraternal twin ,symbols.namesake ,Particle and Plasma Physics ,High Energy Physics - Phenomenology (hep-ph) ,Condensed Matter::Superconductivity ,0103 physical sciences ,Subatomic Physics ,Nuclear ,010306 general physics ,Mathematical Physics ,Boson ,Physics ,Quantum Physics ,Large Hadron Collider ,010308 nuclear & particles physics ,Glueball ,High Energy Physics::Phenomenology ,Molecular ,Nuclear & Particles Physics ,Beyond Standard Model ,High Energy Physics - Phenomenology ,Physical Sciences ,symbols ,Higgs boson ,High Energy Physics::Experiment ,Phenomenology (particle physics) ,Higgs mechanism ,Lepton - Abstract
We present a version of the twin Higgs mechanism with vector-like top partners. In this setup all gauge anomalies automatically cancel, even without twin leptons. The matter content of the most minimal twin sector is therefore just two twin tops and one twin bottom. The LHC phenomenology, illustrated with two example models, is dominated by twin glueball decays, possibly in association with Higgs bosons. We further construct an explicit four-dimensional UV completion and discuss a variety of UV completions relevant for both vector-like and fraternal twin Higgs models., 39 pages; v2 published version
- Published
- 2016
38. Rays of light from the LHC
- Author
-
Tom Melia, Kathryn M. Zurek, Simon Knapen, and Michele Papucci
- Subjects
Physics ,Particle physics ,Photon ,Large Hadron Collider ,010308 nuclear & particles physics ,Physics beyond the Standard Model ,FOS: Physical sciences ,Collimator ,Fermion ,750 GeV diphoton excess ,01 natural sciences ,Collimated light ,law.invention ,Nuclear physics ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Two-photon excitation microscopy ,law ,0103 physical sciences ,High Energy Physics::Experiment ,010306 general physics - Abstract
We consider models for the di-photon resonance observed at ATLAS (with 3.6 fb^{-1}) and CMS (with 2.6 fb^{-1}). We find there is no conflict between the signal reported at 13 TeV, and the constraints from both experiments at 8 TeV with 20.3 fb^{-1}. We make a simple argument for why adding only one new resonance to the standard model (SM) is not sufficient to explain the observation. We explore four viable options: (i): resonance production and decay through loops of messenger fermions or scalars; (ii): a resonant messenger which decays to the di-photon resonance + X; (iii): an edge configuration where A -> B gamma -> C gamma gamma, and (iv): Hidden Valley-like models where the resonance decays to a pair of very light (sub-GeV) states, each of which in turn decays to a pair of collimated photons that cannot be distinguished from a single photon. Since in each case multiple new states have been introduced, a wealth of signatures is expected to ensue at Run-2 of LHC., 20 pages, 9 figures. Typos corrected, appendix A updated and references added
- Published
- 2015
39. Disentangling Mass and Mixing Hierarchies
- Author
-
Dean J. Robinson and Simon Knapen
- Subjects
Physics ,Particle physics ,010308 nuclear & particles physics ,Scale (chemistry) ,Physics beyond the Standard Model ,High Energy Physics::Lattice ,High Energy Physics::Phenomenology ,FOS: Physical sciences ,General Physics and Astronomy ,Fermion ,01 natural sciences ,Standard Model ,Set (abstract data type) ,Theoretical physics ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Naturalness ,0103 physical sciences ,High Energy Physics::Experiment ,010306 general physics ,Model building ,Mixing (physics) - Abstract
We present a fully perturbative mechanism that naturally generates mass hierarchies for the Standard Model (SM) fermions in a flavor-blind sector. The dynamics generating the mass hierarchies can therefore be independent from the source of flavor violation, and hence this dynamics may operate at a much lower scale. This mechanism works by dynamically enforcing simultaneous diagonalization - alignment - among a set of flavor-breaking spurions, as well as generating highly singular spectra for them. It also has general applications in model building beyond the SM, wherever alignment between exotic and SM sources of flavor violation is desired., 5 pages, 1 figure, journal version
- Published
- 2015
40. 125 GeV Higgs from tree-level A -terms
- Author
-
David Shih, Simon Knapen, Daniel Egana-Ugrinovic, and Aria Basirnia
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,Physics beyond the Standard Model ,Superpotential ,High Energy Physics::Phenomenology ,FOS: Physical sciences ,Supersymmetry breaking ,Higgs field ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Higgs boson ,Seiberg duality ,Phenomenology (particle physics) ,Minimal Supersymmetric Standard Model - Abstract
We present a new mechanism to generate large $A$-terms at tree-level in the MSSM through the use of superpotential operators. The mechanism trivially resolves the $A/m^2$ problem which plagues models with conventional, loop-induced $A$-terms. We study both MFV and non-MFV models; in the former, naturalness motivates us to construct a UV completion using Seiberg duality. Finally, we study the phenomenology of these models when they are coupled to minimal gauge mediation. We find that after imposing the Higgs mass constraint, they are largely out of reach of LHC Run I, but they will be probed at Run II. Their fine tuning is basically the minimum possible in the MSSM., Comment: 24 pages, 6 figures
- Published
- 2015
41. Neutral naturalness from orbifold Higgs models
- Author
-
Pietro Longhi, Nathaniel Craig, and Simon Knapen
- Subjects
Physics ,Particle physics ,010308 nuclear & particles physics ,High Energy Physics::Lattice ,Spontaneous symmetry breaking ,High Energy Physics::Phenomenology ,General Physics and Astronomy ,Global symmetry ,01 natural sciences ,Standard Model ,Higgs field ,symbols.namesake ,Naturalness ,0103 physical sciences ,Higgs boson ,symbols ,010306 general physics ,Higgs mechanism ,Boson - Abstract
We present a general class of natural theories in which the Higgs boson is a pseudo-Goldstone boson in an orbifolded gauge theory. The symmetry protecting the Higgs boson at low energies is an accidental global symmetry of the quadratic action, rather than a full continuous symmetry. The lightest degrees of freedom protecting the weak scale carry no standard model (SM) quantum numbers and interact with visible matter principally through the Higgs portal. This opens the door to the systematic study of "neutral naturalness": natural theories with SM-neutral states that are as yet untested by the LHC.
- Published
- 2014
42. Higgs mediation with strong hidden sector dynamics
- Author
-
David Shih and Simon Knapen
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,Large Hadron Collider ,High Energy Physics::Phenomenology ,Gaugino ,FOS: Physical sciences ,Approx ,Hidden sector ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Higgs boson ,High Energy Physics::Experiment ,Higgsino ,Phenomenology (particle physics) - Abstract
We present a simple model that achieves $m_h\approx 126$ GeV in the MSSM with large $A$-terms and TeV-scale stops through a combination of gauge mediation and Higgs-messenger interactions. The $\mu$/$B_\mu$ and $A$/$m_H^2$ problems are both solved by a common mechanism -- partial sequestering from strong hidden sector dynamics. Using the framework of General Messenger Higgs Mediation, we explicitly calculate the soft masses in terms of the vacuum expectation values, operator dimensions and OPE coefficients of the strongly-coupled hidden sector. Along the way, we also present a general analysis of the various constraints on sequestered Higgs mediation models. The phenomenology of such models is similar to gaugino mediation, but with large $A$-terms. The NLSP is always long-lived and is either the lightest stau or the Higgsino. The colored states are typically out of reach of the 8 TeV LHC, but may be accessible at 14 TeV, especially if the NLSP is the lightest stau., Comment: 40 pages, 8 figures, corrected minor typos, updated collider bounds, version accepted in JHEP
- Published
- 2014
43. General Messenger Higgs Mediation
- Author
-
Nathaniel Craig, Simon Knapen, and David Shih
- Subjects
Physics ,High Energy Physics - Theory ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,High Energy Physics::Phenomenology ,FOS: Physical sciences ,01 natural sciences ,Supersymmetry breaking ,Higgs sector ,Hidden sector ,Formalism (philosophy of mathematics) ,Theoretical physics ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,High Energy Physics - Theory (hep-th) ,0103 physical sciences ,Higgs boson ,010306 general physics - Abstract
We present a general formalism for analyzing supersymmetric models where the Higgs sector directly couples to the messengers of supersymmetry breaking. Such Higgs-messenger interactions are strongly motivated by the discovery of a Higgs boson near 125 GeV, but they also raise the specter of the mu/B_mu and A/m_H^2 problems. Using our formalism, we identify new avenues to solving these problems through strong dynamics in the messenger sector or hidden sector. Although our formalism is entirely general, we show how it reproduces familiar results in two simplifying limits: one where the hidden sector consists of a single spurion, and the other where it is approximately superconformal. In the latter limit, our formalism generalizes and clarifies the scenario of hidden sector sequestering, which we show can solve both the mu/B_mu and A/m_H^2 problems uniformly., 35 pages
- Published
- 2013
44. Diagnosing the top-quark angular asymmetry using LHC intrinsic charge asymmetries
- Author
-
Simon Knapen, Yue Zhao, and Matthew J. Strassler
- Subjects
Physics ,Nuclear and High Energy Physics ,Top quark ,Particle physics ,010308 nuclear & particles physics ,media_common.quotation_subject ,High Energy Physics::Phenomenology ,Monte Carlo method ,Tevatron ,FOS: Physical sciences ,Inverse ,Coupling (probability) ,01 natural sciences ,Asymmetry ,High Energy Physics - Experiment ,Standard Model ,High Energy Physics - Phenomenology ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology (hep-ph) ,0103 physical sciences ,High Energy Physics::Experiment ,Sensitivity (control systems) ,010306 general physics ,media_common - Abstract
Flavor-violating interactions involving new heavy particles are among proposed explanations for the $t\overline{t}$ forward-backward asymmetry observed at the Tevatron. Many of these models generate a $t\overline{t}$-plus-jet signal at the LHC. In this paper, we identify several new charge-asymmetric variables in $t\overline{t}j$ events that can contribute to the discovery of such models at the LHC. We propose a data-driven method for the background, largely eliminating the need for a Monte Carlo prediction of $t\overline{t}$-plus-jets, and thus reducing systematic errors. With a fast detector simulation, we estimate the statistical sensitivity of our variables for one of these models, finding that charge-asymmetric variables could materially assist in the exclusion of the Standard Model (SM) across much of the mass and coupling range, given 5 inverse fb of data. Should any signal appear, our variables will be useful in distinguishing classes of models from one another.
- Published
- 2012
45. A Complete Model of Low-Scale Gauge Mediation
- Author
-
Simon Knapen, David Shih, Yue Zhao, and Nathaniel Craig
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,Scale (ratio) ,010308 nuclear & particles physics ,High Energy Physics::Phenomenology ,FOS: Physical sciences ,Supersymmetry ,Gauge (firearms) ,01 natural sciences ,Quantitative Biology::Subcellular Processes ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Simple (abstract algebra) ,0103 physical sciences ,Mediation ,Higgs boson ,010306 general physics - Abstract
Recent signs of a Standard Model-like Higgs at 125 GeV point towards large A-terms in the MSSM. This presents special challenges for gauge mediation, which by itself predicts vanishing A-terms at the messenger scale. In this paper, we review the general problems that arise when extending gauge mediation to achieve large A-terms, and the mechanisms that exist to overcome them. Using these mechanisms, we construct weakly-coupled models of low-scale gauge mediation with extended Higgs-messenger couplings that generate large A-terms at the messenger scale and viable mu/B_mu-terms. Our models are simple, economical, and complete realizations of supersymmetry at the weak scale., 33 pages; v2: refs added, minor changes
- Published
- 2012
46. Bounds from LEP on unparticle interactions with electroweak bosons
- Author
-
Matthew J. Strassler, Simon Knapen, and Scott Kathrein
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,Gauge boson ,Large Hadron Collider ,010308 nuclear & particles physics ,Electron–positron annihilation ,High Energy Physics::Phenomenology ,Electroweak interaction ,Unparticle physics ,FOS: Physical sciences ,Quantum number ,01 natural sciences ,Hidden sector ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,0103 physical sciences ,010306 general physics ,Boson - Abstract
A conformally invariant hidden sector is considered, with a scalar operatorO of low dimension that couples to the electro-weak gauge bosons of the Standard Model, via terms such as F F O. By examining single photon production at LEP, we bound the strength of these interactions. We apply our results, along with those of Delgado and Strassler [1] and of Caracciolo and Rychkov [2], to improve the bound on 4 production through \unparticle self-interactions", as proposed by Feng et al. [3]. We nd the maximum allowable cross-section is of order a few tens of femtobarns at the 14 TeV LHC, and lies well below 1 fb for a wide range of parameters. A \hidden" sector of light particles, none of which carry standard model quantum numbers, is still allowed by experiment. Neither direct searches, nor indirect tests of the standard model, nor cosmology or astrophysics can exclude this possibility. If the coupling of such a sector to our own is purely through gravitation, constraints are extremely weak. But if additional interactions, with characteristic energy scales far below the Planck scale, are present, then it is possible to obtain some correlated constraints on the strength of those interactions and the contents of the hidden sector. Since the contents of such a sector are all neutral and may all be stable or metastable, production of anything in that sector may generally be invisible. In such a case, constraints may be obtained at a wide range of particle colliders, using their searches for unexplained
- Published
- 2011
47. Field representations of vector supersymmetry
- Author
-
Simon Knapen, Roberto Casalbuoni, Laura Tamassia, and Federico Elmetti
- Subjects
High Energy Physics - Theory ,Physics ,Nuclear and High Energy Physics ,Spinor ,Spacetime ,High Energy Physics::Phenomenology ,FOS: Physical sciences ,Supersymmetry ,Superspace ,General Relativity and Quantum Cosmology ,High Energy Physics::Theory ,High Energy Physics - Theory (hep-th) ,Minkowski space ,Central charge ,Multiplet ,Mathematical physics ,Supersymmetry algebra - Abstract
We study some field representations of vector supersymmetry with superspin Y=0 and Y=1/2 and nonvanishing central charges. For Y=0, we present two multiplets composed of four spinor fields, two even and two odd, and we provide a free action for them. The main differences between these two multiplets are the way the central charge operators act and the compatibility with the Majorana reality condition on the spinors. One of the two is related to a previously studied spinning particle model. For Y=1/2, we present a multiplet composed of one even scalar, one odd vector and one even selfdual two-form, which is a truncation of a known representation of the tensor supersymmetry algebra in Euclidean spacetime. We discuss its rotation to Minkowski spacetime and provide a set of dynamical equations for it, which are however not derived from a Lagrangian. We develop a superspace formalism for vector supersymmetry with central charges and we derive our multiplets by superspace techniques. Finally, we discuss some representations with vanishing central charges., 37 pages
- Published
- 2010
48. General gauge mediation at the weak scale
- Author
-
David Shih, Simon Knapen, and Diego Redigolo
- Subjects
Particle physics ,Nuclear and High Energy Physics ,FOS: Physical sciences ,Scale (descriptive set theory) ,Parameter space ,Atomic ,01 natural sciences ,Mathematical Sciences ,High Energy Physics - Phenomenology (hep-ph) ,Particle and Plasma Physics ,0103 physical sciences ,Nuclear ,Boundary value problem ,Symmetry breaking ,010306 general physics ,Mathematical Physics ,Physics ,Quantum Physics ,010308 nuclear & particles physics ,Electroweak interaction ,High Energy Physics::Phenomenology ,Molecular ,Gauge (firearms) ,Nuclear & Particles Physics ,High Energy Physics - Phenomenology ,Tachyon ,Physical Sciences ,Higgs boson ,High Energy Physics::Experiment - Abstract
We completely characterize General Gauge Mediation (GGM) at the weak scale by solving all IR constraints over the full parameter space. This is made possible through a combination of numerical and analytical methods, based on a set of algebraic relations among the IR soft masses derived from the GGM boundary conditions in the UV. We show how tensions between just a few constraints determine the boundaries of the parameter space: electroweak symmetry breaking (EWSB), the Higgs mass, slepton tachyons, and left-handed stop/sbottom tachyons. While these constraints allow the left-handed squarks to be arbitrarily light, they place strong lower bounds on all of the right-handed squarks. Meanwhile, light EW superpartners are generic throughout much of the parameter space. This is especially the case at lower messenger scales, where a positive threshold correction to $m_h$ coming from light Higgsinos and winos is essential in order to satisfy the Higgs mass constraint., Comment: 43 pages, 20 figures, mathematica package included in the source
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49. The Orbifold Higgs
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Simon Knapen, Nathaniel Craig, and Pietro Longhi
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High Energy Physics - Theory ,Physics ,Particle physics ,Nuclear and High Energy Physics ,Physics beyond the Standard Model ,High Energy Physics::Phenomenology ,FOS: Physical sciences ,Elementary particle ,High Energy Physics - Phenomenology ,symbols.namesake ,Higgs field ,Standard Model (mathematical formulation) ,High Energy Physics - Phenomenology (hep-ph) ,High Energy Physics - Theory (hep-th) ,symbols ,Higgs boson ,Grand Unified Theory ,Higgs mechanism ,Orbifold - Abstract
We introduce and systematically study an expansive class of "orbifold Higgs" theories in which the weak scale is protected by accidental symmetries arising from the orbifold reduction of continuous symmetries. The protection mechanism eliminates quadratic sensitivity of the Higgs mass to higher scales at one loop (or more) and does not involve any new states charged under the Standard Model. The structures of the Higgs and top sectors are universal and determined exclusively by group theoretical considerations. The twin Higgs model fits within our framework as the simplest example of an orbifold Higgs. Our models admit UV completions as geometric orbifolds in higher dimensions, and fit naturally within frameworks of low scale gauge coupling unification., Comment: added references, fixed typo's in equations 2.21 and 2.32, small corrections to the discussion in section 5.1
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50. US Cosmic Visions: New Ideas in Dark Matter 2017: Community Report
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Marco Battaglieri, Marco, Battaglieri, Alberto, Belloni, Aaron, Chou, Priscilla, Cushman, Bertrand, Echenard, Rouven, Essig, Juan, Estrada, Feng, Jonathan L., Brenna, Flaugher, Fox, Patrick J., Peter, Graham, Carter, Hall, Roni, Harnik, Joanne, Hewett, Joseph, Incandela, Eder, Izaguirre, Daniel, Mckinsey, Matthew, Pyle, Natalie, Roe, Gray, Rybka, Pierre, Sikivie, Tait, Tim M. P., Natalia, Toro, Richard Van De Water, Neal, Weiner, Kathryn, Zurek, Eric, Adelberger, Andrei, Afanasev, Derbin, Alexander, James, Alexander, Antochi, Vasile Cristian, David Mark Asner, Howard, Baer, Dipanwita, Banerjee, Baracchini, Elisabetta, Phillip, Barbeau, Joshua, Barrow, Noemie, Bastidon, James, Battat, Stephen, Benson, Asher, Berlin, Mark, Bird, Nikita, Blinov, Boddy, Kimberly K., Mariangela, Bondi, Bonivento, Walter M., Mark, Boulay, James, Boyce, Maxime, Brodeur, Leah, Broussard, Ranny, Budnik, Philip, Bunting, Marc, Caffee, Sabato Stefano Caiazza, Sheldon, Campbell, Tongtong, Cao, Gianpaolo, Carosi, Massimo, Carpinelli, Gianluca Cavoto, Andrea, Celentano, Jae Hyeok Chang, Swapan, Chattopadhyay, Alvaro, Chavarria, Chien-Yi, Chen, Kenneth, Clark, John, Clarke, Owen, Colegrove, Jonathon, Coleman, David, Cooke, Robert, Cooper, Michael, Crisler, Paolo, Crivelli, Francesco, D. Eramo, Domenico, D. Urso, Eric, Dahl, William, Dawson, Marzio De Napoli, Raffaella De Vita, Patrick, Deniverville, Stephen, Derenzo, Antonia Di Crescenzo, Di Marco, Emanuele, Dienes, Keith R., Milind, Diwan, Dongwi Handiipondola Dongwi, Alex, Drlica-Wagner, Sebastian, Ellis, Anthony Chigbo Ezeribe, Glennys, Farrar, Francesc, Ferrer, Enectali, Figueroa-Feliciano, Alessandra, Filippi, Giuliana, Fiorillo, Bartosz, Fornal, Arne, Freyberger, Claudia, Frugiuele, Cristian, Galbiati, Iftah, Galon, Susan, Gardner, Andrew, Geraci, Gilles, Gerbier, Mathew, Graham, Edda, Gschwendtner, Christopher, Hearty, Jaret, Heise, Reyco, Henning, Hill, Richard J., David, Hitlin, Yonit, Hochberg, Jason, Hogan, Maurik, Holtrop, Ziqing, Hong, Todd, Hossbach, Humensky, T. B., Philip, Ilten, Kent, Irwin, John, Jaros, Robert, Johnson, Matthew, Jones, Yonatan, Kahn, Narbe, Kalantarians, Manoj, Kaplinghat, Rakshya, Khatiwada, Simon, Knapen, Michael, Kohl, Chris, Kouvaris, Jonathan, Kozaczuk, Gordan, Krnjaic, Valery, Kubarovsky, Eric, Kuflik, Alexander, Kusenko, Rafael, Lang, Kyle, Leach, Tongyan, Lin, Mariangela, Lisanti, Jing, Liu, Kun, Liu, Ming, Liu, Dinesh, Loomba, Joseph, Lykken, Katherine, Mack, Jeremiah, Mans, Humphrey, Maris, Thomas, Markiewicz, Luca, Marsicano, Martoff, C. J., Giovanni, Mazzitelli, Christopher, Mccabe, Mcdermott, Samuel D., Art, Mcdonald, Bryan, Mckinnon, Dongming, Mei, Tom, Melia, Miller, Gerald A., Kentaro, Miuchi, Sahara Mohammed Prem Nazeer, Omar, Moreno, Vasiliy, Morozov, Frederic, Mouton, Holger, Mueller, Alexander, Murphy, Russell, Neilson, Tim, Nelson, Christopher, Neu, Yuri, Nosochkov, Ciaran, O. Hare, Noah, Oblath, John, Orrell, Jonathan, Ouellet, Saori, Pastore, Sebouh, Paul, Maxim, Perelstein, Annika, Peter, Nguyen, Phan, Nan, Phinney, Michael, Pivovaroff, Andrea, Pocar, Maxim, Pospelov, Josef, Pradler, Paolo, Privitera, Stefano, Profumo, Mauro Raggi, Surjeet, Rajendran, Nunzio, Randazzo, Tor, Raubenheimer, Christian, Regenfus, Andrew, Renshaw, Adam, Ritz, Thomas, Rizzo, Leslie, Rosenberg, Andre, Rubbia, Ben, Rybolt, Tarek, Saab, Safdi, Benjamin R., Elena, Santopinto, Andrew, Scarff, Michael, Schneider, Philip, Schuster, George, Seidel, Hiroyuki, Sekiya, Ilsoo, Seong, Gabriele, Simi, Valeria, Sipala, Tracy, Slatyer, Oren, Slone, Peter, F. Smith, Jordan, Smolinsky, Daniel, Snowden-Ifft, Matthew, Solt, Andrew, Sonnenschein, Peter, Sorensen, Neil, Spooner, Brijesh, Srivastava, Ion, Stancu, Louis, Strigari, Jan, Strube, Sushkov, Alexander O., Matthew, Szydagis, Philip, Tanedo, David, Tanner, Rex, Tayloe, William, Terrano, Jesse, Thaler, Brooks, Thomas, Brianna, Thorpe, Thomas, Thorpe, Javier, Tiffenberg, Nhan, Tran, Marco, Trovato, Christopher, Tully, Tony, Tyson, Tanmay, Vachaspati, Sven, Vahsen, Karl van Bibber, Justin, Vandenbroucke, Anthony, Villano, Tomer, Volansky, Guojian, Wang, Thomas, Ward, William, Wester, Andrew, Whitbeck, Williams, David A., Matthew, Wing, Lindley, Winslow, Bogdan, Wojtsekhowski, Hai-Bo, Yu, Shin-Shan, Yu, Tien-Tien, Yu, Xilin, Zhang, Yue, Zhao, and Yi-Ming, Zhong
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Astrophysics and Astronomy ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,hep-ex ,FOS: Physical sciences ,hep-ph ,High Energy Physics - Phenomenology ,astro-ph.CO ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology (hep-ph) ,Particle Physics - Experiment ,Particle Physics - Phenomenology ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
This white paper summarizes the workshop "U.S. Cosmic Visions: New Ideas in Dark Matter" held at University of Maryland on March 23-25, 2017., Comment: 102 pages + references
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