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1. Probing muon g-2 at a future muon collider

   https://doi.org/10.21468/SciPostPhys.16.3.072  

   Arakawa, Jason; Rajaraman, Arvind; Sui, Taotao; Tait, Tim_M P (January 2024, SciPost Physics)

   The4.2\sigma $4.2\sigma$discrepancy in the(g-2) $(g-2)$of the muon provides a hint that may indicate that physics beyond the standard model is at play. A multi-TeV scale muon collider provides a natural testing ground for this physics. In this paper, we discuss the potential to probe the BSM parameter space that is consistent with solving the(g-2)_{\mu} ${(g-2)}_{\mu }$discrepancy in the language of the SMEFT, utilizing the statistical power provided by fitting event rates collected running at multiple energies. Our results indicate the importance of including interference between the BSM and the SM amplitudes, and illustrates how a muon collider running at a handful of lower energies and with less total collected luminosity can better significantly constrain the space of relevant SMEFT coefficients than would be possible for a single high energy run. 

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2. Muon Collider Forum report

   https://doi.org/10.1088/1748-0221/19/02/T02015  

   Black, KM; Jindariani, S; Li, D; Maltoni, F; Meade, P; Stratakis, D; Acosta, D; Agarwal, R; Agashe, K; Aimè, C; et al (February 2024, Journal of Instrumentation)

   Abstract 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. 

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3. The muon Smasher’s guide

   https://doi.org/10.1088/1361-6633/ac6678  

   Al Ali, Hind; Arkani-Hamed, Nima; Banta, Ian; Benevedes, Sean; Buttazzo, Dario; Cai, Tianji; Cheng, Junyi; Cohen, Timothy; Craig, Nathaniel; Ekhterachian, Majid; et al (July 2022, Reports on Progress in Physics)

   Abstract We lay out a comprehensive physics case for a future high-energy muon collider, exploring a range of collision energies (from 1 to 100 TeV) and luminosities. We highlight the advantages of such a collider over proposed alternatives. We show how one can leverage both the point-like nature of the muons themselves as well as the cloud of electroweak radiation that surrounds the beam to blur the dichotomy between energy and precision in the search for new physics. The physics case is buttressed by a range of studies with applications to electroweak symmetry breaking, dark matter, and the naturalness of the weak scale. Furthermore, we make sharp connections with complementary experiments that are probing new physics effects using electric dipole moments, flavor violation, and gravitational waves. An extensive appendix provides cross section predictions as a function of the center-of-mass energy for many canonical simplified models. 

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4. Towards a muon collider

   https://doi.org/10.1140/epjc/s10052-023-11889-x  

   Accettura, Carlotta; Adams, Dean; Agarwal, Rohit; Ahdida, Claudia; Aimè, Chiara; Amapane, Nicola; Amorim, David; Andreetto, Paolo; Anulli, Fabio; Appleby, Robert; et al (September 2023, The European Physical Journal C)

   Abstract A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. This Review summarises the status and the recent advances on muon colliders design, physics and detector studies. The aim is to provide a global perspective of the field and to outline directions for future work. 

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5. Muon Collider Forum Report

   K.M. Black, S. Jindariani (August 2023, https://doi.org/10.48550/arXiv.2209.01318)

   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. 

   more » « less