This statement from the American Linear Collider Committee to the P5 subpanel has three purposes. It presents a brief summary of the case for an $e^+e^-$ Higgs factory that has emerged from Snowmass 2021. It highlights the special virtues of the ILC that are shared with other linear colliders but not with circular colliders. Finally, it calls attention to the resources available in the ILC White Paper for Snowmass (arXiv:2203.07622). The ALCC urges P5 to move the Higgs factory forward as a global project by assigning the idea of an $e^+e^-$ Higgs factory high priority, initiating a global discussion of the technology choice and cost sharing, and offering the option of siting the Higgs factory in the U.S.

The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It is based on a proven accelerator technology. Its experiments will challenge the Standard Model of particle physics and will provide a new window to look beyond it. This document brings the story of the ILC up to date, emphasizing its strong physics motivation, its readiness for construction, and the opportunity it presents to the US and the global particle physics community.

We discuss considerations that can be used to formulate recommendations for initiating a lepton collider project that would provide precision studies of the Higgs boson and related electroweak phenomena.

This paper presents the Mechanical Ventilator Milano (MVM), a novel intensive therapy mechanical ventilator designed for rapid, large-scale, low-cost production for the COVID-19 pandemic. Free of moving mechanical parts and requiring only a source of compressed oxygen and medical air to operate, the MVM is designed to support the long-term invasive ventilation often required for COVID-19 patients and operates in pressure-regulated ventilation modes, which minimize the risk of furthering lung trauma. The MVM was extensively tested against ISO standards in the laboratory using a breathing simulator, with good agreement between input and measured breathing parameters and performing correctly in response to fault conditions and stability tests. The MVM has obtained Emergency Use Authorization by U.S. Food and Drug Administration (FDA) for use in healthcare settings during the COVID-19 pandemic and Health Canada Medical Device Authorization for Importation or Sale, under Interim Order for Use in Relation to COVID-19. Following these certifications, mass production is ongoing and distribution is under way in several countries. The MVM was designed, tested, prepared for certification, and mass produced in the space of a few months by a unique collaboration of respiratory healthcare professionals and experimental physicists, working with industrial partners, and is an excellent ventilator candidate for this pandemic anywhere in the world.

The Advanced Rare Isotope Laboratory (ARIEL) is TRIUMF’s flagship project to create isotopes for science, medicine and business. ARIEL will triple TRIUMF’s rare isotope beam capability, enabling more and new experiments in materials science, nuclear physics, nuclear astrophysics, and fundamental symmetries, as well as the development of new isotopes for the life sciences. Beams from ARIEL’s new 35 MeV, 100 kW electron linear accelerator and from TRIUMF’s original 520 MeV cyclotron will enable breakthrough experiments with the laboratory’s suite of worldclass experiments at the Isotope Separator and Accelerator (ISAC) facility. This invited talk will present an overview of TRIUMF, the ARIEL project, and the exciting science they enable.

In the Randall-Sundrum compactification of AdS5 with detuned brane tensions, supersymmetry can be spontaneously broken by a non-trivial Wilson line for the graviphoton. The supersymmetry breaking vanishes in the tuned limit. This effect is equivalent to supersymmetry breaking by Scherk-Schwarz boundary conditions. email: bagger@jhu.edu email: redi@pha.jhu.edu In this note we show that in the supersymmetric Randall-Sundrum model [1] with detuned brane tensions [2], supersymmetry can be broken by the Hosotani (or Wilson line) mechanism [3]. The setup is based on five-dimensional anti de-Sitter (AdS5) supergravity, compactified on the orbifold S1/Z2, with branes located at the orbifold fixed points. The brane actions and supersymmetry transformations are adjusted so that the bulk-plus-brane theory is locally supersymmetric. This can always be done provided the magnitudes of the brane tensions do not exceed the tuned value [4]. In five-dimensional AdS supergravity, the dynamical fields are the vielbein eAM , the graviphoton BM , and a symplectic Majorana gravitino ΨMi. When the tensions are tuned, the groundstate metric on each brane is flat, and the distance between the branes is a modulus of the compactification. In the detuned case, the metric on each brane is AdS4, and the distance between the branes is fixed in terms of the brane tensions and the bulk cosmological constant. In each case, the vacuum expectation value (VEV) of B5 is not determined by the classical equations of motion. It is a modulus of the compactification, even in the detuned case. The graviphoton gauges a U(1) subgroup of the flat-space SU(2) automorphism group. Under this U(1), the gravitino is charged, with charge proportional to the AdS5 curvature. As in the ordinary Hosotani mechanism, the VEV of B5 induces a gravitino bilinear in the five-dimensional action. At first glance, one might think that supersymmetry is spontaneously broken. In fact, we will see that a VEV breaks supersymmetry when the branes are not tuned, but does not break supersymmetry when they are. This is related to the fact that the distance between the branes is a modulus in the tuned limit. In ref. [6], using the interval representation of the orbifold, boundary conditions consistent with local supersymmetry were found that spontaneously break global supersymmetry. The boundary conditions were proved to be equivalent to a Scherk-Schwarz twist on the orbifold covering space. In the final part of this paper, we will show that these results are equivalent to the breaking by a Wilson line. We start recalling the action for pureN = 2, D = 5 supergravity with cosmological constant, Sbulk = M 3 5 ∫ dx e5 [ − 1 2 R + 6k − 1 4 FFMN + i 2 Ψ̄MiΓ DNΨKi − 2 k Ψ̄MiΣ ~q · ~σijΨNj + √ 6 4 k BNΨ̄MiΓ ~q · ~σijΨKj − i √ 6 16 FMN ( 2Ψ̄Mi Ψ N i + Ψ̄PiΓ ΨQi ) − 1 6 √ 6 ǫFMNFPQBR ] , (1) Note that the VEV of B5 is gauge invariant for gauge transformations defined on the circle. A non-zero VEV of B5 gives rise to a non-trivial Wilson line for the graviphoton around the fifth dimension. This mechanism is reminiscent of one proposed in [5], where an auxiliary field was used to trigger supersymmetry breaking in flat five-dimensional supergravity.

Fermilab at 50, pp. 34-35 (2017) No AccessReflections: Fermilab at 50Jonathan A. BaggerJonathan A. Baggerhttps://doi.org/10.1142/9789813227460_0008Cited by:0 PreviousNext AboutSectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack CitationsRecommend to Library ShareShare onFacebookTwitterLinked InRedditEmail Abstract: My career in physics has spanned over 35 years at nine institutions from east to west, but Fermilab has always been at the center. Fermilab's role has changed — and so has mine — but we have never been far from each other… FiguresReferencesRelatedDetails Fermilab at 50Metrics History PDF download

A comprehensive review of physics at an [Formula: see text] linear collider in the energy range of [Formula: see text] GeV-3 TeV is presented in view of recent and expected LHC results, experiments from low-energy as well as astroparticle physics. The report focusses in particular on Higgs-boson, top-quark and electroweak precision physics, but also discusses several models of beyond the standard model physics such as supersymmetry, little Higgs models and extra gauge bosons. The connection to cosmology has been analysed as well.

A comprehensive review of physics at an \(e^+e^-\) linear collider in the energy range of \(\sqrt{s}=92\) GeV–3 TeV is presented in view of recent and expected LHC results, experiments from low-energy as well as astroparticle physics. The report focusses in particular on Higgs-boson, top-quark and electroweak precision physics, but also discusses several models of beyond the standard model physics such as supersymmetry, little Higgs models and extra gauge bosons. The connection to cosmology has been analysed as well.

We review developments in the theory of multiple, parallel membranes in M-theory. After discussing the inherent difficulties with constructing a maximally supersymmetric lagrangian with the appropriate field content and symmetries, we introduce 3-algebras and show how they allow for such a description. Different choices of 3-algebras lead to distinct classes of 2+1 dimensional theories with varying degrees of supersymmetry. We then demonstrate that these theories are equivalent to conventional superconformal Chern–Simons gauge theories at level k, but with bifundamental matter. Analysing the physical properties of these theories leads to the identification of a certain subclass of models with configurations of M2-branes on Zk orbifolds. These models give rise to a whole new gauge/gravity duality in the form of an AdS4/CFT3 correspondence. We also discuss mass deformations, higher derivative corrections, and the possibility of extracting information about M5-brane physics.

We review developments in the theory of multiple, parallel membranes in M-theory. After discussing the inherent difficulties pertaining to a maximally supersymmetric lagrangian formulation with the appropriate field content and symmetries, we discuss how introducing the concept of 3-algebras allows for such a description. Different choices of 3-algebras lead to distinct classes of 2+1 dimensional theories with varying degrees of supersymmetry. We then describe how these are equivalent to a type of conventional superconformal Chern-Simons gauge theories at level k, coupled to bifundamental matter. Analysing the physical properties of these theories leads to the identification of a certain subclass of models with configurations of M2-branes in Z_k orbifolds of M-theory. In addition these models give rise to a whole new sector of the gauge/gravity duality in the form of an AdS_4/CFT_3 correspondence. We also discuss mass deformations, higher derivative corrections as well as the possibility of extracting information about M5-brane physics.

In this work we present 3-algebraic constructions and representations for three-dimensional N = 5 supersymmetric Chern-Simons theories, and show how they relate to theories with additional supersymmetries. The N = 5 structure constants give theories with Sp(2N) \times SO(M) gauge symmetry, as well as more exotic symmetries known from gauged supergravity. We find explicit lifts from N = 6 to 8, and N = 5 to 6 and 8, for appropriate gauge groups.

We use N = 1 superspace to construct the supersymmetric matter couplings of vector and hyper multiplets in a five-dimensional anti-de Sitter spacetime background. For hypermultiplets, we find that AdS5 supersymmetry requires the scalar fields to lie on a hyper-Kähler manifold endowed with a certain type of holomorphic Killing vector.

We construct the supersymmetric nonlinear sigma model in a fixed AdS_5 background. We use component fields and find that the complex bosons must be the coordinates of a hyper-Kahler manifold that admits a Killing vector satisfying an inhomogeneous tri-holomorphic condition. We propose boundary conditions that map the on-shell bulk hypermultiplets into off-shell chiral multiplets on 3-branes that foliate the bulk. The supersymmetric AdS_5 isometries reduce to superconformal transformations on the brane fields.

We present a supersymmetric version of the two-brane Randall-Sundrum scenario, with arbitrary brane tensions T1 and T2, subject to the bound |T1,2| ≤ √ −6Λ5, where Λ5 < 0 is the bulk cosmological constant. Dimensional reduction gives N = 1, D = 4 supergravity, with cosmological constant Λ4 in the range 1 2Λ5 ≤ Λ4 ≤ 0. The case with Λ4 = 0 requires T1 = −T2 = √ −6Λ5. This work unifies and generalizes previous approaches to the supersymmetric Randall-Sundrum scenario. It also shows that the Randall-Sundrum fine-tuning is not removed by supersymmetry. bagger@jhu.edu belyaev@pha.jhu.edu