Towards a muon collider

A multi-TeV muon collider offers a spectacular opportunity in the direct exploration of the energy frontier. Offering a combination of unprecedented energy collisions in a comparatively clean leptonic environment, a high energy muon collider has the unique potential to provide both precision measurements and the highest energy reach in one machine that cannot be paralleled by any currently available technology. The topic generated a lot of excitement in Snowmass meetings and continues to attract a large number of supporters, including many from the early career community. In light of this very strong interest within the US particle physics community, Snowmass Energy, Theory and Accelerator Frontiers created a cross-frontier Muon Collider Forum in November of 2020. The Forum has been meeting on a monthly basis and organized several topical workshops dedicated to physics, accelerator technology, and detector R&D. Findings of the Forum are summarized in this report.

“…Work to improve tracking algorithm and to recover the loss of efficiency is ongoing. Reproduced from [15]. CC BY 4.0.…”

Section: Simulated Performancementioning

confidence: 99%

“…Average hit density per bunch crossing in the tracker as a function of the detector layer[236]. Reproduced from ref [15]…”

mentioning

confidence: 99%

See 1 more Smart Citation

Muon Collider Forum report

Black,

Jindariani,

et al. 2024

“…The design strategy taken by IMCC relies heavily on the concepts developed by the MAP collaboration [57]. In the baseline design, muons are produced in decays of pions that are produced by colliding a multi-megawatt proton beam onto a target.…”

Section: International Muon Collider Collaborationmentioning

confidence: 99%

Future high energy colliders and options for the U.S.

Bhat,

Jindariani,

Ambrosio

et al. 2023

The United States has a rich history in high energy particle accelerators and colliders — both lepton and hadron machines, which have enabled several major discoveries in elementary particle physics. To ensure continued progress in the field, U.S. leadership as a key partner in building next generation collider facilities abroad is essential; also critically important is to prepare to host an energy frontier collider in the U.S. once the construction of the LBNF/DUNE project is completed. In this paper, we briefly discuss the ongoing and potential U.S. engagement in proposed collider projects abroad and present a number of future collider options we have studied for hosting an energy frontier collider in the U.S. We also call for initiating an integrated national R&D program in the U.S. now, focused on future colliders.

“…In particle physics, two main strategies for exploring new physics are usually pursued: one involves colliding electrons/positrons for precise measurements, and the other uses high-energy colliders like proton-proton machines for direct discoveries. Muon colliders [1], however, offer a unique advantage by combining the benefits of both approaches in a single machine. The high mass of muons allows for multiple ring passages and repeated collisions, mitigating synchrotron radiation emission.…”

Section: Introductionmentioning

confidence: 99%

First results on MPGD prototypes in test beam for MPGD-based HCAL at a future Muon Collider experiment

Colaleo,

Buonsante,

Longo

et al. 2024

Self Cite

The Multi-TeV Muon Collider will allow significant advancement in particle physics and in the understanding of its Standard Model for the era after the High-Luminosity LHC. The Muon Collider physics program involves precise Higgs boson sector measurements and TeV-scale new physics exploration. These goals demand accurate full-event reconstruction. The Particle Flow algorithm, which utilizes tracking, calorimeter, and muon detectors, is ideal for identifying and precisely estimating particle momenta/energies and can accomplish this task. Tracking detectors measure charged particle momenta, while calorimeters provide energy measurements for photons and neutral hadrons. Therefore, combining an exceptional tracking system with high-granularity calorimeters is essential. A major challenge is discerning μμ collision products from beam-induced-background, due to muon decay. To address this, an innovative hadronic calorimeter (HCAL) using Micro Pattern Gas Detectors (MPGDs) is proposed. MPGDs provide robust technology for high radiation and ensure precise spatial measurements. Dedicated studies are needed to assess and optimize the performance of an MPGD-based HCAL, including the development of medium-scale prototypes for performance measurements. This article describes the studies for a hadronic calorimeter based on MPGDs, relying on advanced technologies such as μ-rwell, resistive MicroMegas, and RPWELL. To assess the performance of MPGD detectors, a test beam was conducted in July 2023 at the Super Proton Synchrotron at CERN. This test beam aimed to evaluate the performance of MPGD detectors with 1×1 cm2 pad readout under beam irradiation. Preliminary results from this test are presented.