Roshan Mammen Abraham, Jyotismita Adhikary, Jonathan L. Feng, Max Fieg, Felix Kling, Jinmian Li, Junle Pei, Tanjona R. Rabemananjara, Juan Rojo, Sebastian Trojanowski
{"title":"FPF@FCC: Neutrino, QCD, and BSM Physics Opportunities with Far-Forward Experiments at a 100 TeV Proton Collider","authors":"Roshan Mammen Abraham, Jyotismita Adhikary, Jonathan L. Feng, Max Fieg, Felix Kling, Jinmian Li, Junle Pei, Tanjona R. Rabemananjara, Juan Rojo, Sebastian Trojanowski","doi":"arxiv-2409.02163","DOIUrl":null,"url":null,"abstract":"Proton-proton collisions at energy-frontier facilities produce an intense\nflux of high-energy light particles, including neutrinos, in the forward\ndirection. At the LHC, these particles are currently being studied with the\nfar-forward experiments FASER/FASER$\\nu$ and SND@LHC, while new dedicated\nexperiments have been proposed in the context of a Forward Physics Facility\n(FPF) operating at the HL-LHC. Here we present a first quantitative exploration\nof the reach for neutrino, QCD, and BSM physics of far-forward experiments\nintegrated within the proposed Future Circular Collider (FCC) project as part\nof its proton-proton collision program (FCC-hh) at $\\sqrt{s} \\simeq 100$ TeV.\nWe find that $10^9$ electron/muon neutrinos and $10^7$ tau neutrinos could be\ndetected, an increase of several orders of magnitude compared to (HL-)LHC\nyields. We study the impact of neutrino DIS measurements at the FPF@FCC to\nconstrain the unpolarised and spin partonic structure of the nucleon and assess\ntheir sensitivity to nuclear dynamics down to $x \\sim 10^{-9}$ with neutrinos\nproduced in proton-lead collisions. We demonstrate that the FPF@FCC could\nmeasure the neutrino charge radius for $\\nu_{e}$ and $\\nu_\\mu$ and reach down\nto five times the SM value for $\\nu_\\tau$. We fingerprint the BSM sensitivity\nof the FPF@FCC for a variety of models, including dark Higgs bosons,\nrelaxion-type scenarios, quirks, and millicharged particles, finding that these\nexperiments would be able to discover LLPs with masses as large as 50 GeV and\ncouplings as small as $10^{-8}$, and quirks with masses up to 10 TeV. Our study\nhighlights the remarkable opportunities made possible by integrating\nfar-forward experiments into the FCC project, and it provides new motivation\nfor the FPF at the HL-LHC as an essential precedent to optimize the forward\nphysics experiments that will enable the FCC to achieve its full physics\npotential.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"8 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - Nuclear Experiment","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2409.02163","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Proton-proton collisions at energy-frontier facilities produce an intense
flux of high-energy light particles, including neutrinos, in the forward
direction. At the LHC, these particles are currently being studied with the
far-forward experiments FASER/FASER$\nu$ and SND@LHC, while new dedicated
experiments have been proposed in the context of a Forward Physics Facility
(FPF) operating at the HL-LHC. Here we present a first quantitative exploration
of the reach for neutrino, QCD, and BSM physics of far-forward experiments
integrated within the proposed Future Circular Collider (FCC) project as part
of its proton-proton collision program (FCC-hh) at $\sqrt{s} \simeq 100$ TeV.
We find that $10^9$ electron/muon neutrinos and $10^7$ tau neutrinos could be
detected, an increase of several orders of magnitude compared to (HL-)LHC
yields. We study the impact of neutrino DIS measurements at the FPF@FCC to
constrain the unpolarised and spin partonic structure of the nucleon and assess
their sensitivity to nuclear dynamics down to $x \sim 10^{-9}$ with neutrinos
produced in proton-lead collisions. We demonstrate that the FPF@FCC could
measure the neutrino charge radius for $\nu_{e}$ and $\nu_\mu$ and reach down
to five times the SM value for $\nu_\tau$. We fingerprint the BSM sensitivity
of the FPF@FCC for a variety of models, including dark Higgs bosons,
relaxion-type scenarios, quirks, and millicharged particles, finding that these
experiments would be able to discover LLPs with masses as large as 50 GeV and
couplings as small as $10^{-8}$, and quirks with masses up to 10 TeV. Our study
highlights the remarkable opportunities made possible by integrating
far-forward experiments into the FCC project, and it provides new motivation
for the FPF at the HL-LHC as an essential precedent to optimize the forward
physics experiments that will enable the FCC to achieve its full physics
potential.