Searches for new physics at SND@LHC Boyarsky, Alexey; Mikulenko, Oleksii; Ovchynnikov, Maksym ...
The journal of high energy physics,
03/2022, Volume:
2022, Issue:
3
Journal Article
Peer reviewed
Open access
A
bstract
SND@LHC is an approved experiment equipped to detect scatterings of neutrinos produced in the far-forward direction at the LHC, and aimed to measure their properties. In addition, the ...detector has a potential to search for new feebly interacting particles (FIPs) that may be produced in proton-proton collisions. In this paper, we discuss signatures of new physics at SND@LHC for two classes of particles: stable FIPs that may be detected via their scattering, and unstable FIPs that decay inside the detector. We estimate the sensitivity of SND@LHC to probe scatterings of leptophobic dark matter and decays of neutrino, scalar, and vector portal particles. Finally, we also compare and qualitatively analyze the potential of SND@LHC and FASER/FASER
ν
experiments for these searches.
A
bstract
The Future Circular hadron Collider (FCC-hh) is a proposed successor of the Large Hadron Collider (LHC). FCC-hh would push both the energy and intensity frontiers of searches for new ...physics particles. In particular, due to higher energy and luminosity than at the LHC, at FCC-hh there would be produced around ≃ 30 times larger amount of
B
mesons and ≃ 120 times of
W
bosons, which then may decay into feebly interacting particles. In this paper we demonstrate the potential of FCC-hh by studying its sensitivity to heavy neutral leptons (HNLs) with masses
m
N
< m
B
. We consider various locations of a displaced decay volume embedded in the planned infrastructure of FCC-hh. We demonstrate that FCC-hh may substantially improve the reach of the parameter space of HNLs as compared to the searches proposed at the LHC.
Diphoton channel provides a clean signature in searches for new physics. In this paper, we discuss a connection between the diphoton channel (γγ) and triboson channels (Zγγ, ZZγ, WWγ) imposed by the ...SU(2)L×U(1)Y symmetry of the Standard Model (SM) in certain classes of models. To illustrate this idea we choose a simple model that has all these channels. In this model, the same physics can give rise to γ+MET instead of γγ and 2 bosons plus missing energy instead of 3-boson channels. We analyze existing constraints and previous searches and show that channels WWγ and especially Zγ+MET have a potential to discover new physics at the LHC.
After a series of upgrades the Large Hadron Collider will deliver an integrated luminosity of up to 3000 fb−1 with s=14 GeV for each experiment. Aspects of the supersymmetry and other beyond the ...standard model (BSM) search programme are discussed for this scenario. These include the expected discovery reach for gluinos decaying to third generation squarks as well as to light squarks, for the third generation squark decaying to top quarks and neutralino and for the neutralino-chargino pairs decaying to final states including a Z and a W boson. Depending on the SUSY particles, the discovery reach can be improved by about 300 to 400 GeV with increasing the luminosity from 300 to 3000 fb−1. The potential for discovery of non-SUSY new particles is also discussed.
Long-lived particles can manifest themselves at the LHC via "displaced vertices"-several charged tracks originating from a position separated from the proton interaction point by a macroscopic ...distance. Here we demonstrate the potential of the muon trackers at the CMS experiment for displaced vertex searches. We use heavy neutral leptons and Chern-Simons portal as two examples of long-lived particles for which the CMS muon tracker can provide essential information about their properties.
Measurement of the 171Tm beta spectrum Juget, Frédéric; van Dijk, Maarten; Maugeri, Emilio Andrea ...
Applied radiation and isotopes,
December 2023, 2023-12-00, 20231201, Volume:
202
Journal Article
Peer reviewed
Open access
The beta spectrum of the main transition of the β- decay of 171Tm was measured using a double focalizing spectrometer. The instrument was lately improved in order to reduce its low energy threshold ...to 34 keV. We used the spectrometer to measure the beta spectrum end-point energy of the main transition of 171Tm decay using the Kurie plot formalism. We report a new value of 97.60(38) keV, which is in agreement with previous measurements. In addition, the spectrum shape was compared with the ξ-approximation calculation where the shape factor is equal to 1 and good agreement was found between the theory and the measurement at the 1% level.
•Double focalizing magnetic spectrometer.•Beta Spectrum measurement.•Kurie plot.•171Tm beta spectrum end-point energy measurement.•Beta Spectrum shape.
The Future Circular Collider (FCC-hh) is a proposed successor of the Large
Hadron Collider (LHC). FCC-hh would push both the energy and intensity
frontiers of searches for new physics particles. In ...particular, due to higher
energy and luminosity than at the LHC, at FCC-hh there would be produced around
$\simeq\!30$ times larger amount of $B$ mesons and $\simeq 120$ times of $W$
bosons, which then may decay into feebly interacting particles. In this paper
we demonstrate the potential of FCC-hh by studying its sensitivity to heavy
neutral leptons (HNLs) with masses $m_{N}<m_{B}$. We consider various locations
of a displaced decay volume embedded in the planned infrastructure of FCC-hh.
We demonstrate that FCC-hh may substantially improve the reach of the parameter
space of HNLs as compared to the searches proposed at the LHC.
SND@LHC is an approved experiment equipped to detect scattering of neutrinos produced in the far-forward direction at the LHC, and aimed to measure their properties. In addition, the detector has a ...potential to search for new feebly interacting particles (FIPs) that may be produced in proton-proton collisions. In this paper, we discuss FIPs signatures at SND@LHC considering two classes of particles: stable FIPs that may be detected via their scattering, and unstable FIPs that decay inside the detector. We estimate the sensitivity of SND@LHC to probe scattering of leptophobic dark matter, and to detect decays of neutrino, scalar, and vector portal particles. Finally, we also compare and qualitatively analyze the potential of SND@LHC and FASER/FASER{\nu} experiments for these searches.
The beta spectrum of the main transition of the beta-decay of 171Tm was measured using a double focalizing spectrometer. The instrument was lately improved in order to reduce its low energy threshold ...to 34 keV. We used the spectrometer to measure the beta spectrum end-point energy of the main transition of 171Tm decay using the Kurie plot formalism. We report a new value of 97.60(38) keV, which is in agreement with previous measurements. In addition, the spectrum shape was compared with the xi-approximation calculation where the shape factor is equal to 1 and good agreement was found between the theory and the measurement at the 1% level.
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