Updates on the experiments X17

  • I
  • Thread starter kodama
  • Start date
  • #1
kodama
848
118
TL;DR Summary
. Assuming the ATOMKI evaluation of the electron-pair production rate from X17
your thoughts on this -- Status of the X17 search in Montreal

they'll verify or refute a clear signal after about two weeks of data taking with a 2 μA proton beam

if Montreal Tandem accelerator confirm X17 a clear signal after about two weeks of data taking with a 2 μA proton beam would you accept it ? when it is ready - data 2023

ARIEL experiments and theory and The Positron Annihilation to Dark Matter Experiment also seeking X17 not sure when it is ready


[Submitted on 21 Nov 2022]

Status of the X17 search in Montreal​


G. Azuelos, B. Broerman, D. Bryman, W.C. Chen, H.N. da Luz, L. Doria, A. Gupta, L-A. Hamel, M. Laurin, K. Leach, G. Lefebvre, J-P. Martin, A. Robinson, N. Starinski, R. Sykora, D. Tiwari, U. Wichoski, V. Zacek

At the Montreal Tandem accelerator, an experiment is being set up to measure internal pair creation from the decay of nuclear excited states using a multiwire proportional chamber and scintillator bars surrounding it from the DAPHNE experiment. The acceptance covers a solid angle of nearly 4π. Preamplifiers and the data acquisition hardware have been designed and tested. The water-cooled 7LiF target, mounted on an Al foil is in a thin carbon fiber section of the beamline. The experiment will focus at first on a measurement of the internal pair creation from the 18.15 MeV state of 8Be. Assuming the ATOMKI evaluation of the electron-pair production rate from X17, a Geant4 simulation predicts observation of a clear signal after about two weeks of data taking with a 2 μA proton beam. The IPC measurement could eventually be extended to the giant dipole resonance of 8Be, as well as to other nuclei, in particular to 10B.


Comments:5 pages, 4 figures, Proceedings contribution, TRIUMF Ariel Workshop, May 25-27 2022
Subjects: Instrumentation and Detectors (physics.ins-det); Nuclear Experiment (nucl-ex)
Cite as:arXiv:2211.11900 [physics.ins-det]
(or arXiv:2211.11900v1 [physics.ins-det] for this version)
https://doi.org/10.48550/arXiv.2211.11900


[Submitted on 16 Oct 2022]
ARIEL experiments and theory
Petr Navratil

I present an overview of experiments at TRIUMF ARIEL and ISAC facilities covering both the current and the future envisioned programs. I also briefly review theory program at TRIUMF that relates to the ARIEL experimental program. I highlight several recent experimental results from the nuclear astrophysics, nuclear structure, fundamental symmetries, and the sterile neutrino search. Finally, I mention ongoing theoretical ab initio calculations of the proton capture on 7Li related to the X17 boson observation.

Comments: Contribution to proceedings of the workshop New Scientific Opportunities with the TRIUMF ARIEL e-linac, 10 pages, 5 figures
Subjects: Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
Cite as: arXiv:2210.08438 [nucl-th]

[Submitted on 29 Sep 2022]

Dark sector studies with the PADME experiment​


A.P. Caricato, M. Martino, I. Oceano, S. Spagnolo, G. Chiodini, F. Bossi, R. De Sangro, C. Di Giulio, D. Domenici, G. Finocchiaro, L.G. Foggetta, M. Garattini, A. Ghigo, P. Gianotti, T. Spadaro, E. Spiriti, C. Taruggi, E. Vilucchi, V. Kozhuharov, S. Ivanov, Sv. Ivanov, R. Simeonov, G. Georgiev, F. Ferrarotto, E. Leonardi, P. Valente, E. Long, G.C. Organtini, G. Piperno, M. Raggi, S. Fiore, P. Branchini, D. Tagnani, V. Capirossi, F. Pinna, A. Frankenthal

The Positron Annihilation to Dark Matter Experiment (PADME) uses the positron beam of the DAΦNE Beam-Test Facility, at the Laboratori Nazionali di Frascati (LNF) to search for a Dark Photon A′. The search technique studies the missing mass spectrum of single-photon final states in e+e−→A′γ annihilation in a positron-on-thin-target experiment. This approach facilitates searches for new particles such as long lived Axion-Like-Particles, protophobic X bosons and Dark Higgs. This talk illustrated the scientific program of the experiment and its first physics results. In particular, the measurement of the cross-section of the SM process e+e−→γγ at s√=21 MeV was shown.


Subjects: High Energy Physics - Experiment (hep-ex); Instrumentation and Detectors (physics.ins-det)
Cite as:arXiv:2209.14755 [hep-ex]

[Submitted on 22 Sep 2022 (v1), last revised 1 Nov 2022 (this version, v2)]
New anomaly observed in 12C supports the existence and the vector character of the hypothetical X17 boson
A.J. Krasznahorkay, A. Krasznahorkay, M. Begala, M. Csatlós, L. Csige, J. Gulyás, A. Krakó, J. Timár, I. Rajta, I. Vajda, N.J. Sas

Employing the 11B(p,γ)12C nuclear reaction, the angular correlation of e+e− pairs was investigated in the angular range of 40∘Θ≤175∘ for five different proton energies between Ep = 1.50 - 2.50 MeV. At small angles (Θ≤120∘), the results can be well interpreted by the internal pair creation process of electromagnetic radiations with E1 and M1 multipolarities and by the external pair creation in the target backing. However, at angles greater than 120∘, additional count excess and anomalies were observed, which could be well accounted for by the existence of the previously suggested hypotetical X17 particle. Our results show that the X17 particle was generated mainly in E1 radiation. The derived mass of the particle is mXc2=17.03±0.11(stat)±0.20(syst) MeV. According to the mass, and to the derived branching ratio (Bx=3.6(3)×10−6), this is likely the same X17 particle, which we recently suggested for describing the anomaly observed in the decay of 8Be and 4He.

Comments: 5 pages, 4 figures. arXiv admin note: text overlap with arXiv:2104.10075, arXiv:2205.07744, arXiv:1910.10459

[Submitted on 19 Sep 2022]
Resonant search for the X17 boson at PADME
Luc Darmé, Marco Mancini, Enrico Nardi, Mauro Raggi

We discuss the experimental reach of the Frascati PADME experiment in searching for new light bosons via their resonant production in positron annihilation on fixed target atomic electrons. A scan in the mass range around 17 MeV will thoroughly probe the particle physics interpretation of the anomaly observed by the ATOMKI nuclear physics experiment. In particular, for the case of a spin-1 boson, the viable parameter space can be fully covered in a few months of data taking.

Comments: 8 pages, 5 figures and 1 table
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
Cite as: arXiv:2209.09261 [hep-ph]



Nuclear Experiment
[Submitted on 8 Aug 2022 (v1), last revised 15 Aug 2022 (this version, v2)]
Searching for New Physics with DarkLight at the ARIEL Electron-Linac
The DarkLight Collaboration, E. Cline, R. Corliss, J. C. Bernauer, R. Alarcon, R. Baartman, S. Benson, J. Bessuille, D. Ciarniello, A. Christopher, A. Colon, W. Deconinck, K. Dehmelt, A. Deshpande, J. Dilling, D. H. Dongwi, P. Fisher, T. Gautam, M. Gericke, D. Hasell, M. Hasinoff, E. Ihloff, R. Johnston, R. Kanungo, J. Kelsey, O. Kester, M. Kohl, I. Korover, R. Laxdal, S. Lee, X. Li, C. Ma, A. Mahon, J. W. Martin, R. Milner, M. Moore, P. Moran, J. Nazeer, K. Pachal, T. Patel, T. Planche, M. Rathnayake, M. Suresh, C. Vidal, Y. Wang, S. Yen

The search for a dark photon holds considerable interest in the physics community. Such a force carrier would begin to illuminate the dark sector. Many experiments have searched for such a particle, but so far it has proven elusive. In recent years the concept of a low mass dark photon has gained popularity in the physics community. Of particular recent interest is the 8Be and 4He anomaly, which could be explained by a new fifth force carrier with a mass of 17 MeV/c2. The proposed DarkLight experiment would search for this potential low mass force carrier at ARIEL in the 10-20 MeV e+e− invariant mass range. This proceeding will focus on the experimental design and physics case of the DarkLight experiment.

Comments: 7 pages, 4 figures, to be submitted as part of the proceedings on "New Scientific Opportunities with the TRIUMF ARIEL e-linac"
Subjects: Nuclear Experiment (nucl-ex); Instrumentation and Detectors (physics.ins-det)
Cite as: arXiv:2208.04120 [nucl-ex]
(or arXiv:2208.04120v2 [nucl-ex] for this version)

[Submitted on 18 Nov 2021 (v1), last revised 10 Feb 2022 (this version, v2)]
Neutrino Physics Opportunities with the IsoDAR Source at Yemilab
J. Alonso, C.A. Argüelles, A. Bungau, J.M. Conrad, B. Dutta, Y.D. Kim, E. Marzec, D. Mishins, S.H. Seo, M. Shaevitz, J. Spitz, A. Thompson, L. Waites, D. Winklehner

IsoDAR seeks to place a high-power-cyclotron and target combination, as an intense source of ν¯e at the level of ∼1023/year, close to a kiloton-scale neutrino detector in order to gain sensitivity to very short-baseline neutrino oscillations (ν¯e→ν¯e) and perform precision tests of the weak interaction, among other physics opportunities. Recently, IsoDAR has received preliminary approval to be paired with the 2.26~kton target volume liquid scintillator detector at the Yemi Underground Laboratory (Yemilab) in Korea, at a 17~m center-to-center baseline, and cavern excavation for IsoDAR is now complete. In this paper, we present the physics capabilities of IsoDAR@Yemilab in terms of sensitivity to oscillations (via inverse beta decay, IBD; ν¯e+p→e++n), including initial-state wavepacket effects, and the weak mixing angle (via elastic scattering off atomic electrons, ν¯e+e−→ν¯e+e−). We also introduce a study of IsoDAR sensitivity to new particles, such as a light X boson, produced in the target that decays to νeν¯e.

Comments: 17 pages, 16 figures; this version presents a number of new physics topics and studies
Subjects: High Energy Physics - Experiment (hep-ex); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:2111.09480 [hep-ex]

High Energy Physics - Phenomenology
[Submitted on 12 Oct 2021]
X17 discovery potential in the γN→e+e−N process at electron scattering facilities
Johannes Backens, Marc Vanderhaeghen

We propose a direct search for the X17 particle, which was conjectured to explain the ATOMKI 8Be and 4He anomalies, through the dilepton photoproduction process on a nucleon in the photon energy range below or around the pion production threshold. For the scenarios of either pseudoscalar, vector, or axial-vector quantum numbers of the conjectured X17, we use existing constraints to estimate the X17 signal process. For dilepton resolutions which have been achieved in previous experiments, a signal-to-background ratio of up to an order of magnitude is found for a neutron target, and in particular for the pseudoscalar and vector X17 scenarios.

Comments: 5 pages, 2 figures
Subjects: High Energy Physics - Phenomenology (hep-ph); Nuclear Theory (nucl-th)
Cite as: arXiv:2110.06055 [hep-ph]
 
Last edited:

Answers and Replies

  • #2
Vanadium 50
Staff Emeritus
Science Advisor
Education Advisor
2021 Award
29,181
14,426
Don't understand why there needs to be so many threads on this rather than having the messages all in one place. And don't see what the advantage is to guessing what the results might be rather than waiting to see what they are.
 
  • #3
kodama
848
118
i find it exciting that 2023 we will have answers

if x17 is confirmed what exactly does it do ?

as a force what new interaction with fermions?

is it work with susy?
 
Last edited:
  • #4
kodama
848
118
could x17 explain why Neutrino have mass
 
  • #5
Vanadium 50
Staff Emeritus
Science Advisor
Education Advisor
2021 Award
29,181
14,426
No.
 
  • Like
Likes topsquark and ohwilleke
  • #6
kodama
848
118
No.
if in 2023 Montreal Tandem accelerator or other like Positron Annihilation to Dark Matter Experiment and ARIEL and ISAC facilities and DarkLight experiment. rules out x17 i would accept it


if in 2023 Montreal Tandem accelerator or other experiments like PADME and ARIEL and ISAC facilities and DarkLight experiment. confirm x17 would you accept it ?
 
  • #7
Vanadium 50
Staff Emeritus
Science Advisor
Education Advisor
2021 Award
29,181
14,426
You asked a question. "could x17 explain why Neutrino have mass". The answer is "no". That has nothing to do with what other experiments do or do not see. If these experiments see positive results, it still wouldn't explain neutrino masses, the results of the last election in [pick your favorite country]. why Nicholas Cage finds himself making stinker after stinker, or why red licorice is yummy and black licorice is nasty.

Further, the thing to do is not to speculate on what they might see, but wait and see what they do see. You know, actual science.
 
  • #8
kodama
848
118
You asked a question. "could x17 explain why Neutrino have mass". The answer is "no". That has nothing to do with what other experiments do or do not see. If these experiments see positive results, it still wouldn't explain neutrino masses, the results of the last election in [pick your favorite country]. why Nicholas Cage finds himself making stinker after stinker, or why red licorice is yummy and black licorice is nasty.

Further, the thing to do is not to speculate on what they might see, but wait and see what they do see. You know, actual science.
do you think Montreal Tandem accelerator or other like Positron Annihilation to Dark Matter Experiment and ARIEL and ISAC facilities and DarkLight experiment could prove that x17 existed if successful and positive for a signal ?
 
  • #9
Vanadium 50
Staff Emeritus
Science Advisor
Education Advisor
2021 Award
29,181
14,426
Just as posting multiple threads on the same topic doesn't yield different answers, asking the same question multiple times doesn't either.
 
  • Love
  • Like
Likes topsquark, phinds and Tom.G
  • #10
kodama
848
118
Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Beyond the Standard Model
Latest results and future prospects of the NA64 experiment at CERN SPS
L. Marsicano
Full text: pdf
Pre-published on: November 21, 2022
Published on: —
Abstract
The search for Dark Matter (DM) is one of the hottest topics of modern physics. Despite the various astrophysical and cosmological observations proving its existence, its elementary properties remain to date unknown. In addition to gravity, DM could interact with ordinary matter through a new force, mediated by a new vector boson (Dark Photon, Heavy Photon or A′
), kinetically mixed with the Standard Model photon. The NA64-e experiment at CERN fits in this scenario, aiming to produce DM particles using the 100 GeV SPS electron beam impinging on a thick active target (electromagnetic calorimeter). In this setup the DM production signature consists in a large observed missing energy, defined as the difference between the energy of the incoming electron and the energy measured in the calorimeter, coupled with null activity in the downstream veto systems. Recently, following the growing interest in positron annihilation mechanisms for DM production, the NA64 collaboration has performed preliminary studies with the aim to run the experiment with a positron beam, as planned within the POKER (POsitron resonant annihilation into darK mattER) project.
This work presents the latest NA64-e
results and its future prospects, reporting on the progresses in the positron beam run and discussing the sensitivity of the experiment to alternative variations of to the dark photon paradigm.
DOI: https://doi.org/10.22323/1.414.0174
 
  • #11
Vanadium 50
Staff Emeritus
Science Advisor
Education Advisor
2021 Award
29,181
14,426
There is very little value in just dumping an abstract here.

Did you read the paper? It spends only a few sentences on the X17, and what there is negative. No observation.
 
  • #12
kodama
848
118
There is very little value in just dumping an abstract here.

Did you read the paper? It spends only a few sentences on the X17, and what there is negative. No observation.
Did you read the paper? Did you read section 4.2 page 6
Screenshot 2022-11-29 at 10-26-10 ICHEP2022_174.pdf.png
 
Last edited:
  • #13
Vanadium 50
Staff Emeritus
Science Advisor
Education Advisor
2021 Award
29,181
14,426
Yes. The key words are "has been proposed". That means "does not exist".
 
  • #14
kodama
848
118
Yes. The key words are "has been proposed". That means "does not exist".
the experiment or x17? this thread is about

Updates on the experiments X17​


any and all present or future experiments search for x17

this paper

Latest results and future prospects of the NA64 experiment at CERN SPS

Screenshot 2022-11-29 at 15-01-23 Screenshot 2022-11-29 at 10-26-10 ICHEP2022_174.pdf.png (WEB...png


experiments search for x17

is relevant to this thread

it also explains why NA64 experiment at CERN SPS hadn't seen x17 and what NA64 experiment at CERN SPS will do future experiments search for x17
 
Last edited:
  • #15
Vanadium 50
Staff Emeritus
Science Advisor
Education Advisor
2021 Award
29,181
14,426
it also explains why NA64 experiment at CERN SPS hadn't seen x17
Yeah, it seems not to be there. :smile:
 
  • #16
kodama
848
118
Yeah, it seems not to be there. :smile:
:)

the exciting thing i think is that we should get results as early as 2023. When I first heard about it in the news in 2016 and again in 2019 I wondered how soon will we know. These papers seem to imply 2023
 
  • #17
kodama
848
118
Volume 406 - Corfu Summer Institute 2021 "School and Workshops on Elementary Particle Physics and Gravity" (CORFU2021) - Workshop on Connecting Insights in Fundamental Physics: Standard Model and Beyond

Searching for light dark matter with the PADME experiment

I. Oceano*, A.P. Caricato, M. Martino, S. Spagnolo, G. Chiodini, F. Bossi, et al. (click to show)

Full text: pdf

Published on: November 23, 2022

Abstract
The search for dark matter at accelerators has gained a lot of attention in recent years. Among the theoretical scenarios that can be studied, an attractive one is postulating a new UD(1)
gauge symmetry mediated by a massive boson often named dark photon A′. The A′ could be the bridge between the Standard Model (SM) and a hypothetical Dark Sector (DM), having a small coupling ϵ with SM particles.
PADME (Positron Annihilation to Dark Matter Experiment) is the first fixed target experiment searching for the A′ produced in association with a photon in e+e− annihilations. It exploits the missing mass technique and does not make any assumption on the decay mode of the A′. PADME is located at the Laboratori Nazionali di Frascati (LNF) of INFN and it is designed to be sensitive to the production of a dark photon with mass MA′≤23.7 MeV. Its setup is also ideal to investigate other scenarios of low mass dark matter: axion-like particles (ALPs), dark Higgs, and the X17
boson claimed to explain anomalies observed recently in a nuclear physics experiment.

DOI: https://doi.org/10.22323/1.406.0040

Screenshot 2022-11-29 at 22-46-39 CORFU2021_040.pdf.png


Screenshot 2022-11-29 at 22-47-53 CORFU2021_040.pdf.png
Screenshot 2022-11-29 at 22-48-27 CORFU2021_040.pdf.png

Screenshot 2022-11-29 at 22-48-43 CORFU2021_040.pdf.png
 

Suggested for: Updates on the experiments X17

  • Last Post
Replies
16
Views
527
Replies
22
Views
1K
  • Last Post
Replies
11
Views
442
Replies
4
Views
796
Replies
4
Views
662
Replies
9
Views
1K
Replies
3
Views
1K
  • Last Post
Replies
1
Views
929
Replies
6
Views
813
Top