LHC/FCC-based muon colliders

Discovering the physics of (g−2)μ at future muon colliders

Physical Review D ◽

10.1103/physrevd.103.075028 ◽

2021 ◽

Vol 103 (7) ◽

Author(s):

Rodolfo Capdevilla ◽

David Curtin ◽

Yonatan Kahn ◽

Gordan Krnjaic

Keyword(s):

Muon Colliders

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Vector boson fusion at multi-TeV muon colliders

Journal of High Energy Physics ◽

10.1007/jhep09(2020)080 ◽

2020 ◽

Vol 2020 (9) ◽

Author(s):

Antonio Costantini ◽

Federico De Lillo ◽

Fabio Maltoni ◽

Luca Mantani ◽

Olivier Mattelaer ◽

...

Keyword(s):

Cross Sections ◽

Vector Boson ◽

High Energy ◽

New Physics ◽

Vector Boson Fusion ◽

Weak Boson ◽

Wide Range ◽

Lepton Colliders ◽

Muon Colliders ◽

New Phenomena

Abstract High-energy lepton colliders with a centre-of-mass energy in the multi-TeV range are currently considered among the most challenging and far-reaching future accelerator projects. Studies performed so far have mostly focused on the reach for new phenomena in lepton-antilepton annihilation channels. In this work we observe that starting from collider energies of a few TeV, electroweak (EW) vector boson fusion/scattering (VBF) at lepton colliders becomes the dominant production mode for all Standard Model processes relevant to studying the EW sector. In many cases we find that this also holds for new physics. We quantify the size and the growth of VBF cross sections with collider energy for a number of SM and new physics processes. By considering luminosity scenarios achievable at a muon collider, we conclude that such a machine would effectively be a “high-luminosity weak boson collider,” and subsequently offer a wide range of opportunities to precisely measure EW and Higgs couplings as well as discover new particles.

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WIMPs at high energy muon colliders

Physical Review D ◽

10.1103/physrevd.103.075004 ◽

2021 ◽

Vol 103 (7) ◽

Author(s):

Tao Han ◽

Zhen Liu ◽

Lian-Tao Wang ◽

Xing Wang

Keyword(s):

High Energy ◽

High Energy Muon ◽

Muon Colliders

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Hunting wino and higgsino dark matter at the muon collider with disappearing tracks

Journal of High Energy Physics ◽

10.1007/jhep06(2021)133 ◽

2021 ◽

Vol 2021 (6) ◽

Author(s):

Rodolfo Capdevilla ◽

Federico Meloni ◽

Rosa Simoniello ◽

Jose Zurita

Keyword(s):

Dark Matter ◽

Simple Strategy ◽

Physics Program ◽

Daunting Task ◽

Muon Collider ◽

New States ◽

Muon Colliders ◽

Particle Decays ◽

Electrically Charged

Abstract We study the capabilities of a muon collider experiment to detect disappearing tracks originating when a heavy and electrically charged long-lived particle decays via X+→ Y+Z0, where X+ and Z0 are two almost mass degenerate new states and Y+ is a charged Standard Model particle. The backgrounds induced by the in-flight decays of the muon beams (BIB) can create detector hit combinations that mimic long-lived particle signatures, making the search a daunting task. We design a simple strategy to tame the BIB, based on a detector-hit-level selection exploiting timing information and hit-to-hit correlations, followed by simple requirements on the quality of reconstructed tracks. Our strategy allows us to reduce the number of tracks from BIB to an average of 0.08 per event, hence being able to design a cut-and-count analysis that shows that it is possible to cover weak doublets and triplets with masses close to $$ \sqrt{s}/2 $$ s / 2 in the 0.1–10 ns range. In particular, this implies that a 10 TeV muon collider is able to probe thermal MSSM higgsinos and thermal MSSM winos, thus rivaling the FCC-hh in that respect, and further enlarging the physics program of the muon collider into the territory of WIMP dark matter and long-lived signatures. We also provide parton-to-reconstructed level efficiency maps, allowing an estimation of the coverage of disappearing tracks at muon colliders for arbitrary models.

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