Narrow Results

Some theories of particle physics are so compelling that it is worth doing a comprehensive and systematic set of experimental searches to see if they are realized in nature. Supersymmetry is one such theory. This review focuses on the motivation for a broad set of cosmology-inspired search strategies at the Tevatron and on their implementation and results at the Collider Detector at Fermilab (CDF) with the first few fb^-1 of integrated luminosity of data.

This review presents the world's most precise measurement of the W-boson mass m_W using data corresponding to ≈ 2.2 fb^-1 integrated luminosity collected with the CDF II detector at Fermi National Accelerator Laboratory (Fermilab). With samples of 470,126 W → eν candidates and 624,708 W → μν candidates, m_W is measured to be 80387±12_stat ± 15_syst = 80387 ± 19 MeV [Phys. Rev. Lett.108, 151803 (2012)]. This result significantly exceeds the precision of all previous measurements and improves the world averaged precision by 30%.

Fermilab carries out an extensive program of accelerator-based high energy particle physics research at the Intensity Frontier that relies on the operation of 8 GeV and 120 GeV proton beamlines for a number of fixed target experiments. Routine operation with a world-record 700 kW of average 120 GeV beam power on the neutrino target was achieved in 2017 as a result of the Proton Improvement Plan (PIP) upgrade. There are plans to further increase the power from 900–1000 kW. The next major upgrade of the FNAL accelerator complex, called PIP-II, is under development. It aims at 1.2 MW beam power on target at the start of the LBNF/DUNE experiment in the middle of the next decade and assumes replacement of the existing 40 years old 400 MeV normal-conducting Linac with a modern 800 MeV superconducting RF linear accelerator. There are several concepts to further double the beam power to $>$ 2.4 MW after replacement of the existing 8 GeV Booster synchrotron. In this review, we discuss current performance of the Fermilab proton accelerator complex, the upgrade plans for the next two decades and the accelerator R&D program to address cost and performance risks for these upgrades.

The Muon Campus at Fermilab is a system through which muons are delivered to the storage ring of the Muon $g-2$ Experiment (E989). It consists of a set of 1 km beamlines that transport and prepare a highly polarized muon beam out of secondaries produced downstream a target station. Realistic simulations of this beam delivery system (BDS) using COSY INFINITY, and presented here, contribute to the understanding and characterization of the muon beam production in relation to the statistical and systematic uncertainties of the E989 measurement, intended to be smaller than 0.14 parts per million to achieve the goals of the experiment. The impact of nonlinearities from fringe fields and high-order contributions on the BDS performance are presented, as well as detailed studies of the interactions between secondaries and the beamline elements apertures, particle decay channels, spin dynamics and beamline misalignments.

Robert R. Wilson was the brilliant designer, builder and founding director of the Fermi National Accelerator Laboratory with its series of high-energy physics particle accelerators providing collision energies of 200, 400 and 2,000 GeV, the most powerful facilities in their class over a period of 40 years. He undertook the "impossible" and succeeded. With untrammeled courage he challenged the establishment as he bypassed many conventional practices in accelerator design, construction and cost control. With his remarkable talents he addressed a wide range of important aspects of the relationships of art and science, elegance and efficiency and physics and society. In doing so he always found ways for his pursuit of science to support his strong advocacy for human rights, international collaboration and democracy.

Leon Max Lederman was a towering figure in the world of elementary particle physics in the second half of the 20th century. His experiments shaped our understanding of the world of particle physics. Included in the long list of his accolades was the 1988 Nobel Prize in Physics, which he shared with Melvin Schwartz and Jack Steinberger for the discovery that the muon neutrino is distinct from the electron neutrino. Among his many science leadership roles, he served for a decade as Director of Fermi National Accelerator Laboratory. Lederman was a spokesperson and champion for science and one of the most visible physicists of his generation. In his remarkable career Lederman journeyed from his youth in the Bronx, NY, to the directorship of Fermilab in Batavia, IL, to become an international proponent for physics beyond any one institution.

Leon Max Lederman was a towering figure in the world of elementary particle physics in the second half of the 20th century. His experiments shaped our understanding of the world of particle physics. Included in the long list of his accolades was the 1988 Nobel Prize in Physics, which he shared with Melvin Schwartz and Jack Steinberger for the discovery that the muon neutrino is distinct from the electron neutrino. Among his many science leadership roles, he served for a decade as Director of Fermi National Accelerator Laboratory. Lederman was a spokesperson and champion for science and one of the most visible physicists of his generation. In his remarkable career Lederman journeyed from his youth in the Bronx, NY, to the directorship of Fermilab in Batavia, IL, to become an international proponent for physics beyond any one institution.

Robert R. Wilson was the brilliant designer, builder and founding director of the Fermi National Accelerator Laboratory with its series of high-energy physics particle accelerators providing collision energies of 200, 400 and 2,000 GeV, the most powerful facilities in their class over a period of 40 years. He undertook the “impossible” and succeeded. With untrammeled courage he challenged the establishment as he bypassed many conventional practices in accelerator design, construction and cost control. With his remarkable talents he addressed a wide range of important aspects of the relationships of art and science, elegance and efficiency and physics and society. In doing so he always found ways for his pursuit of science to support his strong advocacy for human rights, international collaboration and democracy.

The NOνA experiment is a long-baseline accelerator-based neutrino oscillation experiment. It uses the upgraded NuMI beam from Fermilab and measures electron-neutrino appearance and muon-neutrino disappearance at its far detector in Ash River, Minnesota. Goals of the experiment include measurements of θ₁₃, mass hierarchy and the CP violating phase. NOνA has begun to take neutrino data and first neutrino candidates are observed in its detectors. This document provides an overview of the scientific reach of the experiment, the status of detector operation and physics analysis, as well as the first data.