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Wilkinson, G.

Publications and source records attributed to Wilkinson, G..

9 records
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DOE OSTI2025

Future Circular Collider Feasibility Study Report

In response to the 2020 Update of the European Strategy for Particle Physics , the Future Circular Collider (FCC) Feasibility Study was launched as an international collaboration hosted by CERN. This report describes the FCC integrated programme , which consists of two stages: an electron-positron collider (FCC-ee) in the first phase, serving as a high-luminosity Higgs, top, and electroweak factory; followed by a proton-proton collider (FCC-hh) at the energy frontier in the second phase. The FCC-ee is designed to operate at four key centre-of-mass energies: the Z pole, the WW pair production threshold, the ZH production peak, and the top/anti-top production threshold—each delivering the highest possible luminosities to four experiments. Over 15 years of operation, FCC-ee will produce more than 6 trillion Z bosons, 200 million WW pairs, nearly 3 million Higgs bosons, and 2 million top anti-top pairs. Precise energy calibration at the Z pole and WW threshold will be achieved through frequent resonant depolarisation of pilot bunches. The sequence of operation modes between the Z, WW, and ZH substages remains flexible. The FCC-hh will operate at a centre-of-mass energy of approximately 85 TeV—nearly an order of magnitude higher than the LHC—and is designed to deliver 5 to 10 times the integrated luminosity of the upcoming High-Luminosity LHC. Its mass reach for direct discovery extends to several tens of TeV. In addition to proton-proton collisions, the FCC-hh is capable of supporting ion-ion, ion-proton, and lepton-hadron collision modes. This second volume of the Feasibility Study Report presents the complete design of the FCC-ee collider, its operation and staging strategy, the full-energy booster and injector complex, required accelerator technologies, safety concepts, and technical infrastructure. It also includes the design of the FCC-hh hadron collider, development of high-field magnets, hadron injector options, and key technical systems for FCC-hh.

Benedikt, M. [European Organization for Nuclear Re↗
DOE OSTI2025

Future Circular Collider Feasibility Study Report

Volume 3 of the FCC Feasibility Report presents studies related to civil engineering, the development of a project implementation scenario, and environmental and sustainability aspects. The report details the iterative improvements made to the civil engineering concepts since 2018, taking into account subsurface conditions, accelerator and experiment requirements, and territorial considerations. It outlines a technically feasible and economically viable civil engineering configuration that serves as the baseline for detailed subsurface investigations, construction design, cost estimation, and project implementation planning. Additionally, the report highlights ongoing subsurface investigations in key areas to support the development of an improved 3D subsurface model of the region. The report describes the development of the project scenario based on the ‘avoid-reduce-compensate’ iterative optimisation approach. The reference scenario balances optimal physics performance with territorial compatibility, implementation risks, and costs. Environmental field investigations covering almost 600 hectares of terrain—including numerous urban, economic, social, and technical aspects—confirmed the project’s technical feasibility and contributed to the preparation of essential input documents for the formal project authorisation phase. The summary also highlights the initiation of public dialogue as part of the authorisation process. The results of a comprehensive socio-economic impact assessment, which included significant environmental effects, are presented. Even under the most conservative and stringent conditions, a positive benefit-cost ratio for the FCC-ee is obtained. Finally, the report provides a summary of the studies conducted to document the current state of the environment.

Benedikt, M. [European Organization for Nuclear Re↗
DOE OSTI2019

Physics beyond colliders at CERN: beyond the Standard Model working group report

The Physics Beyond Colliders initiative is an exploratory study aimed at exploiting the full scientific potential of the CERN’s accelerator complex and scientific infrastructures through projects complementary to the LHC and other possible future colliders. These projects will target fundamental physics questions in modern particle physics. This document presents the status of the proposals presented in the framework of the Beyond the Standard Model physics working group, and explore their physics reach and the impact that CERN could have in the next 10-20 years on the international landscape.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2015

First determination of the $CP$ content of D → π + π – π + π – and updated determination of the $CP$ contents of D → π + π – π 0 and D → K + K – π 0

Quantum-correlated ψ(3770)→DD¯ decays collected by the CLEO-c experiment are used to perform a first measurement of $F$ $^{4π}_{+}$, the fractional CP-even content of the self-conjugate decay D → π + π – π + π – , obtaining a value of 0.737 ± 0.028. An important input to the measurement comes from the use of D → $K$ $^{0}_{S}$π + π – and D → $K$ $^{0}_{L}$π + π – decays to tag the signal mode. This same technique is applied to the channels D → π + π – π 0 and D → K + K – π 0 , yielding $F$ $^{πππ0}_{+}$ =1.014 ± 0.045 ± 0.022 and $F$ $^{KKπ0}_{+}$ = 0.734 ± 0.106 ± 0.054, where the first uncertainty is statistical and the second systematic. These measurements are consistent with those of an earlier analysis, based on CP-eigenstate tags, and can be combined to give values of $F$ $^{πππ0}_{+}$ = 0.973 ± 0.017 and $F$ $^{KKπ0}_{+}$ = 0.732 ± 0.055. The results will enable the three modes to be included in a model-independent manner in measurements of the unitarity triangle angle γ using B ∓ → DK ∓ decays, and in time-dependent studies of CP violation and mixing in the D 0 D¯ 0 system.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2014

First determination of the CP content of D → π + π – π 0 and D → K + K – π 0

Quantum-correlated Ψ(3770) → DD¯ decays collected by the CLEO-c experiment are used to perform first measurements of F + , the fractional CP-even content of the self-conjugate decays D → π + π – π 0 and D → K + K – π 0 . Values of 0.968 ± 0.017 ± 0.006 and 0.731 ± 0.058 ± 0.021 are obtained for π + π – π 0 and K + K – π 0 , respectively. It is demonstrated how modes of this sort can be cleanly included in measurements of the unitarity triangle angle γ using B → DK decays. The high CP-even content of D → π + π – π 0 , in particular, makes this a promising mode for improving the precision on γ.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗