Heavy-quark opportunities and challenges at FCC-ee

Monteil, S.; Wilkinson, G.

doi:10.1140/epjp/s13360-021-01814-0

Cited by 10 publications

(7 citation statements)

References 23 publications

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“…15, left). Starting from 5 × 10 12 Z decays, one expects ∼ 540 reconstructed B s → µ + µ − events and ∼ 70 reconstructed B 0 → µ + µ − events in the SM [156]. Important for the the observation of B 0 → µ + µ − at FCC-ee will be the control of the B 0 → π + π − background, using particle identification techniques such as dE/dx, time of flight, and Cherenkov detectors.…”

Section: Decays Of B-flavored Hadronsmentioning

confidence: 99%

The Future Circular Collider: a Summary for the US 2021 Snowmass Process

Bernardi,

Brost,

Denisov

et al. 2022

Preprint

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In this white paper for the 2021 Snowmass process, we give a description of the proposed Future Circular Collider (FCC) project and its physics program. The paper summarizes and updates the discussion submitted to the European Strategy on Particle Physics. After construction of an ≈ 90 km tunnel, an electronpositron collider based on established technologies allows world-record instantaneous luminosities at center-of-mass energies from the Z resonance through the ZH and WW and up to tt thresholds, enabling a very rich set of fundamental measurements including Higgs couplings determinations at the subpercent level, precision tests of the weak and strong forces, and searches for new particles, including dark matter, both directly and via virtual corrections or mixing. Among other possibilities, the FCC-ee will be able to (i) indirectly discover new particles coupling to the Higgs and/or electroweak bosons up to scales Λ ≈ 7 and 50 TeV, respectively; (ii) perform competitive SUSY tests at the loop level in regions not accessible at the LHC; (iii) study heavy-flavor and tau physics in ultra-rare decays beyond the LHC reach, and (iv) achieve the best potential in direct collider searches for dark matter, sterile neutrinos, and axion-like particles with masses up to ≈ 90 GeV. The tunnel can then be reused for a proton-proton collider, establishing record center-of-mass collision energy, allowing unprecedented reach for direct searches for new particles up to the ≈ 50 TeV scale, and a diverse program of measurements of the Standard Model and Higgs boson, including a precision measurement of the Higgs self-coupling, and conclusively testing weakly-interacting massive particle scenarios of thermal relic dark matter. The FCC-ee and FCC-hh physics and accelerator programs are remarkably synergistic and complementary. The program builds on the stable funding provided by the CERN member states and the existing, long-standing worldwide partnerships built via the LHC, but requires substantial contributions both intellectual and financial from the US and other non-CERN-members to become a reality. 8.3.3 Decays of the tau to three muons and to a muon and a photon . . .

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Section: Decays Of B-flavored Hadronsmentioning

confidence: 99%

The Future Circular Collider: a Summary for the US 2021 Snowmass Process

Bernardi,

Brost,

Denisov

et al. 2022

Preprint

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“…The ratio of matrix elements |V ub |/|V cb | is expected to be ultimately measured at 3% and 1% precision with 50 1/fb and 300 1/fb, respectively. The possibility to collect several 10 8 W decays at FCC-ee offers the opportunity to measure |V cb | from on-shell W + → c b decays ( [75] and references therein). The total uncertainty in the latter quantity is estimated to be better than the one extracted from the future upgrade of Belle II.…”

Section: Direct Determination Of V Txmentioning

confidence: 99%

“…Yields of B 0 and B + are therefore around fifteen times larger than those expected at the completion of Belle II. A further discussion about the advantages of the Z 0 environment and a review of flavour physics opportunities including those sketched in this article are provided in [75]. Flavour possibilities are not restricted to the Z 0 pole physics.…”

Section: Theory Challengesmentioning

confidence: 99%

High precision in CKM unitarity tests in $b$ and $c$ decays

Lenz¹,

Monteil²

2022

Preprint

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This article surveys the important questions attached to unitarity tests of the Cabibbo-Kobayashi-Maskawa matrix, with a focus on the direct determinations of the magnitude of CKM matrix elements. The current CKM anomalies are discussed and the clear-cut prospects at LHCb and Belle II envisaged. The anticipated precision on CP -conserving and CP -violating observables at the projected upgrades of the LHCb and Belle II experiments is examined from the point of view of the search for New Physics in B-meson mixing, addressing the bottlenecks in precision for the interpretation of the measurements for future experiments and highlighting the related theoretical and experimental challenges. The vibrant prospects at future e + e − colliders running at the Z 0 pole and W + W − are eventually discussed.

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“…The same approach is followed in this essay to characterize the Lepton-Flavour Violating (LFV) b-flavoured particle decays. The study of the B 0 → K * (892) 0 τ + τ − decay is described in more details in the companion essay in this volume [4].…”

Section: Partial Reconstruction Techniquesmentioning

confidence: 99%

“…The rare decays that are allowed in the SM are discussed in a companion essay of this volume [4]. This section focuses instead on the forbidden modes in the SM in which the lepton number conservation is violated.…”

Section: Introduction To Rare Heavy-flavoured Decaysmentioning

confidence: 99%

Hunt for rare processes and long-lived particles at FCC-ee

Chrzaszcz,

Suarez,

Monteil

2021

Preprint

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In this essay we discuss the possibilities and associated challenges concerning beyond the Standard Model searches at FCC-ee, such as rare decays of heavy-flavoured particles and long-lived particles. The Standard Model contains several suppression mechanisms, which cause a given group of processes to happen rarely, resulting in rare decays. The interest in these decays lies in the fact that the physics beyond the Standard Model does not need to be affected by the same suppression mechanism and therefore can naturally manifest in these decays. Their interest is reinforced by the recent report of several measurements of b-flavoured rare decays, showing deviations with respect to the Standard Model predictions. We will show how the FCC-ee project has unique capabilities to address these scientific questions and will consider the related detector design challenges to meet. Another group of processes discussed are those that produce new particles with relatively long lifetimes, that travel substantial distances inside the detectors before decaying. Models containing long-lived particles can give answers to many open questions of the Standard Model, such as the nature of dark matter, or the neutrino masses, among others; while providing an interesting experimental complement to mainstream searches. Long-lived particles often display unique experimental signatures, such as displaced tracks and vertices, "disappearing" tracks, or anomalously charged jets. Due to this, they are affected by very low background levels but in exchange, they often require dedicated reconstruction algorithms and triggers. The discovery of any of the discussed cases would have a critical impact in High Energy Physics and FCC-ee could provide a unique experimental opportunity to explore them. Moreover, the searches proposed here could motivate an out-of-the-box optimization of the experimental conditions, that could bring in innovative solutions, such as new, possibly very large tracking detectors; or cutting-edge reconstruction algorithms that would boost the FCC-ee reach for unusual final states.

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Heavy-quark opportunities and challenges at FCC-ee

Abstract: The abundant production of beauty and charm hadrons in the $$5 \times 10^{12}$$ 5 × 10 12 $$Z^0$$ Z 0 decays expected at FCC-ee offers outstanding opportunities in flavour physics that in general exceed those available at Belle II and are c… Show more

Cited by 10 publications

References 23 publications

The Future Circular Collider: a Summary for the US 2021 Snowmass Process

The Future Circular Collider: a Summary for the US 2021 Snowmass Process

High precision in CKM unitarity tests in $b$ and $c$ decays

Hunt for rare processes and long-lived particles at FCC-ee

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