scholarly journals Prospects of direct search for dark photon and dark Higgs in SeaQuest/E1067 experiment at the Fermilab main injector

2017 ◽  
Vol 32 (10) ◽  
pp. 1730008 ◽  
Author(s):  
Ming Xiong Liu
Keyword(s):  
Mass Range ◽  
High Energy ◽  
New Physics ◽  
Mass Region ◽  
Electromagnetic Calorimeter ◽  
Current Status ◽  
Dark Sector ◽  
Dark Photon ◽  
Near Future ◽  
Search Program

In this review, we present the current status and prospects of the dark sector physics search program of the SeaQuest/E1067 fixed target dimuon experiment at Fermilab Main Injector. There has been tremendous excitement and progress in searching for new physics in the dark sector in recent years. Dark sector refers to a collection of currently unknown particles that do not directly couple with the Standard Model (SM) strong and electroweak (EW) interactions but assumed to carry gravitational force, thus could be candidates of the missing Dark Matter (DM). Such particles may interact with the SM particles through “portal” interactions. Two of the simple possibilities are being investigated in our initial search: (1) dark photon and (2) dark Higgs. They could be within immediate reach of current or near future experimental search. We show there is a unique opportunity today at Fermilab to directly search for these particles in a highly motivated but uncharted parameter space in high-energy proton–nucleus collisions in the beam-dump mode using the 120 GeV proton beam from the Main Injector. Our current search window covers the mass range 0.2–10 GeV/c2, and in the near future, by adding an electromagnetic calorimeter (EMCal) to the spectrometer, we can further explore the lower mass region down to about [Formula: see text][Formula: see text]1 MeV/c2 through the di-electron channel. If dark photons (and/or dark Higgs) were observed, they would revolutionize our understanding of the fundamental structures and interactions of our universe.

scholarly journals Magnetic-dipole corrections to RK and RK* in the Standard Model and dark photon scenarios

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Emidio Gabrielli ◽  
Marco Palmiotto
Keyword(s):  
Magnetic Dipole ◽  
New Physics ◽  
Mass Region ◽  
Long Distance ◽  
Lepton Flavor ◽  
Dark Photon ◽  
Dipole Interactions ◽  
Decay Widths ◽  
Charged Leptons ◽  
Inclusive Decay

Abstract In this work we evaluate the long-distance QED contributions, induced by the magnetic-dipole corrections to the final charged leptons, on the B meson decay widths B → (K, K*)ℓ+ℓ− and ratios RK,K* = Γ(B → (K, K*)μ+μ−)/Γ(B → (K, K*)e+e−), as well as on $$ {R}_{K,K\ast}^{\tau } $$ R K , K ∗ τ (with μ replaced by the τ lepton). QED long-distance contributions induced by the Coulomb potential corrections (Fermi-Sommerfeld factors) were also included. Corresponding corrections to the inclusive decay widths of B → Xsℓ+ℓ−, with ℓ = e, μ, τ, are also analyzed for completeness. The magnetic-dipole corrections, which are manifestly Lepton Flavor Universality violating and gauge-invariant, are expected to be particularly enhanced in RK* for the dilepton mass region close to the threshold. However, we find that the largest contribution of all these corrections to the RK,K* observables do not exceed a few per mille effect, thus reinforcing the validity of previous estimates about the leading QED corrections to RK,K*. Finally, viable new physics contributions to RK,K* induced by the exchange of a massless dark-photon via magnetic-dipole interactions, which provide the leading contribution to the corresponding B → (K, K*)ℓ+ℓ− amplitudes in this scenario, are analyzed in light of the present RK,K* anomalies.

scholarly journals THE CASE OF αs: Z VERSUS LOW ENERGIES OR, HOW NATURE SHOWS US NEW PHYSICS

1996 ◽  
Vol 11 (18) ◽  
pp. 3195-3225 ◽  
Author(s):  
M. SHIFMAN
Keyword(s):  
High Energy ◽  
New Physics ◽  
Current Status ◽  
Low Energies

The values of αs determined from low and high energy measurements are in irreconcilable contradiction with each other. The current status of the problem is critically reviewed. Consequences of the αs contradiction, in conjunction with other anomalies detected at the Z peak, are discussed. This article has been updated in accordance with experimental numbers reported at summer conferences.

scholarly journals Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
G. Aad ◽  
◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Contact Interaction ◽  
Hadron Collider ◽  
Mass Range ◽  
New Physics ◽  
Mass Region ◽  
Mass Scale ◽  
Energy Scale ◽  
High Mass ◽  
Final States ◽  
Dilepton Final States

Abstract A search for new physics with non-resonant signals in dielectron and dimuon final states in the mass range above 2 TeV is presented. This is the first search for non-resonant signals in dilepton final states at the LHC to use a background estimate from the data. The data, corresponding to an integrated luminosity of 139 fb−1, were recorded by the ATLAS experiment in proton-proton collisions at a center-of-mass energy of $$ \sqrt{s} $$ s = 13 TeV during Run 2 of the Large Hadron Collider. The benchmark signal signature is a two-quark and two-lepton contact interaction, which would enhance the dilepton event rate at the TeV mass scale. To model the contribution from background processes a functional form is fit to the dilepton invariant-mass spectra in data in a mass region below the region of interest. It is then extrapolated to a high-mass signal region to obtain the expected background there. No significant deviation from the expected background is observed in the data. Upper limits at 95% CL on the number of events and the visible cross-section times branching fraction for processes involving new physics are provided. Observed (expected) 95% CL lower limits on the contact interaction energy scale reach 35.8 (37.6) TeV.

scholarly journals EMC STUDIES USING THE SIMULATION FRAMEWORK OF PANDA

2009 ◽  
Vol 24 (02n03) ◽  
pp. 462-466
Author(s):  
◽  
ALEKSANDRA BIEGUN
Keyword(s):  
Large Scale ◽  
Mass Range ◽  
High Energy ◽  
Electromagnetic Calorimeter ◽  
Lead Tungstate ◽  
Analysis Strategies ◽  
And Performance ◽  
Exotic Hadrons ◽  
Individual Detector ◽  
Design Construction

The Anti-Proton ANnihilation at DArmstadt (PANDA) experiment proposed at the Facility for Antiproton and Ion Research (FAIR) in Darmstadt (Germany) will perform a high-precision spectroscopy of charmonium and exotic hadrons, such as hybrids, glueballs and hypernuclei. A highly intense beam of anti-protons provided by High Energy Storage Ring (HESR) with an unprecedented resolution will scan a mass range of 2 to 5.5 GeV/c2. In preparation for experiments with PANDA, careful and large-scale simulation studies need to be performed in the coming years to determine analysis strategies, to provide feedback for the design, construction and performance optimisation of individual detector components and to design methods for the calibration and interpretation of the experimental results. Results of a simulation for the ElectroMagnetic Calorimeter (EMC), built from lead tungstate (PWO) crystals and placed inside the Target Spectrometer (TS), are presented. The simulations were carried out using the PandaRoot framework, which is based on ROOT and being developed by the PANDA collaboration.

scholarly journals Searches for Dark Photons at Accelerators

2021 ◽  
Vol 71 (1) ◽  
Author(s):  
Matt Graham ◽  
Christopher Hearty ◽  
Mike Williams
Keyword(s):  
Dark Matter ◽  
Online Publication ◽  
Science Volume ◽  
Annual Review ◽  
Electromagnetic Current ◽  
Publication Date ◽  
Dark Sector ◽  
Ordinary Matter ◽  
Dark Photon ◽  
Near Future

Dark matter particles may interact with other dark matter particles via a new force mediated by a dark photon, A′, which would be the dark-sector analog to the ordinary photon of electromagnetism. The dark photon can obtain a highly suppressed mixing-induced coupling to the electromagnetic current, providing a portal through which dark photons can interact with ordinary matter. This review focuses on A′ scenarios that are potentially accessible to accelerator-based experiments. We summarize the existing constraints placed by such experiments on dark photons, highlight what could be observed in the near future, and discuss the major experimental challenges that must be overcome to improve sensitivities. Expected final online publication date for the Annual Review of Nuclear and Particle Science, Volume 71 is September 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

scholarly journals ANALYSIS OF HIGH ENERGY K+K- PHOTOPRODUCTION ON HYDROGEN

2005 ◽  
Vol 20 (02n03) ◽  
pp. 581-583
Author(s):  
Ł. BIBRZYCKI ◽  
L. LEŚNIAK ◽  
A. P. SZCZEPANIAK
Keyword(s):  
Effective Mass ◽  
Cross Section ◽  
Good Description ◽  
Mass Range ◽  
High Energy ◽  
Mass Region ◽  
P Wave ◽  
S Wave ◽  
Mass Distributions ◽  
Scalar Resonances

We have analyzed the γp→pK+K- reaction in the K+K- effective mass region around the mass of the ϕ(1020) meson. The interference of the S-wave contribution with the P-wave has been studied. Both scalar resonances f0(980) and a0(980) have been taken into account. We obtained a good description of the available experimental data, in particular the mass distributions and the moments of the kaon angular distribution. Our calculations give values of the integrated S-wave total photoproduction cross section between 4 and 7 nb for the K+K- effective mass range around the ϕ(1020) mass and at the laboratory photon energy near 5 GeV. These numbers favor lower experimental estimates obtained at DESY.

scholarly journals New physics with boosted single top production at the LHC and future colliders

2020 ◽  
Vol 80 (1) ◽  
Author(s):  
J. A. Aguilar–Saavedra ◽  
M. L. Mangano
Keyword(s):  
Standard Model ◽  
Mass Range ◽  
High Energy ◽  
New Physics ◽  
Final States ◽  
Hadron Colliders ◽  
High Luminosity ◽  
Anomalous Couplings ◽  
Weakly Coupled ◽  
Single Top

AbstractWe address the potential of measurements with boosted single-top final states at the high-luminosity LHC (HL-LHC) and possible future hadron colliders: the high-energy LHC (HE-LHC), and the future circular collider (FCC). As new physics examples to assess the potential, we consider the search for tbW anomalous couplings and for a weakly-coupled $$W'$$W′ boson. The FCC would improve by a factor of two the sensitivity to anomalous couplings of the HL-LHC. For $$W'$$W′ bosons, the FCC is sensitive to $$W'$$W′ couplings 2–5 times smaller than the HL-LHC in the mass range 2–4 TeV, and to masses up to 30 TeV in the case of Standard Model-like couplings.

scholarly journals Dark photon search at a circular e+e− collider

2017 ◽  
Vol 32 (23n24) ◽  
pp. 1750138 ◽  
Author(s):  
Min He ◽  
Xiao-Gang He ◽  
Cheng-Kai Huang
Keyword(s):  
Standard Model ◽  
Mass Range ◽  
Photon Mass ◽  
Dark Sector ◽  
Dark Photon ◽  
Mixing Parameter ◽  
The Standard Model ◽  
One Year ◽  
Gauge Interaction ◽  
Better Than

One of the interesting portals linking a dark sector and the Standard Model (SM) is the kinetic mixing between the SM [Formula: see text] field with a new dark photon [Formula: see text] from a [Formula: see text] gauge interaction. Stringent limits have been obtained for the kinetic mixing parameter [Formula: see text] through various processes. In this work, we study the possibility of searching for a dark photon interaction at a circular [Formula: see text] collider through the process [Formula: see text]. We find that the constraint on [Formula: see text] for dark photon mass in the few tens of GeV range, assuming that the [Formula: see text] invariant mass can be measured to an accuracy of 0.5% [Formula: see text], can be better than [Formula: see text] for the proposed CEPC with a 10-year running at [Formula: see text] (statistic) level, and better than [Formula: see text] for FCC-ee with even just one-year running at [Formula: see text], better than the LHCb, ATLAS, CMS experiments and other facilities can do in a similar dark photon mass range. For FCC-ee, running at [Formula: see text], the constraint can be even better.

scholarly journals HIGH ENERGY ASTROPHYSICAL NEUTRINO FLUX AND MODIFIED DISPERSION RELATIONS

2009 ◽  
Vol 24 (31) ◽  
pp. 5819-5829 ◽  
Author(s):  
J. L. BAZO ◽  
M. BUSTAMANTE ◽  
A. M. GAGO ◽  
O. G. MIRANDA
Keyword(s):  
Neutrino Flux ◽  
High Energy ◽  
New Physics ◽  
Cpt Violation ◽  
Cpt Invariance ◽  
Oscillation Phase ◽  
Flavor Oscillation ◽  
Cosmological Neutrinos ◽  
Near Future ◽  
Astrophysical Neutrino

Motivated by the interest in searches for violation of CPT invariance, we study its possible effects in the flavor ratios of high-energy neutrinos coming from cosmic accelerators. In particular, we focus on the effect of an energy-independent new physics contribution to the neutrino flavor oscillation phase and explore whether it is observable in future detectors. Such a contribution could be related not only to CPT violation but also to a nonuniversal coupling of neutrinos to a torsion field. We conclude that this extra phase contribution only becomes observable, in the best case, at energies greater than 1016.5 GeV, which is about five orders of magnitude higher than the most energetic cosmological neutrinos to be detected in the near future. Therefore, if these effects are present only in the oscillation phase, they are going to be unobservable, unless a new mechanism or source capable to produce neutrinos of such energy were detected.

PRECISION LOW ENERGY WEAK NEUTRAL CURRENT EXPERIMENTS

1995 ◽  
Vol 10 (39) ◽  
pp. 2979-2992 ◽  
Author(s):  
K.S. KUMAR ◽  
E.W. HUGHES ◽  
R. HOLMES ◽  
P.A. SOUDER
Keyword(s):  
High Energy Physics ◽  
Neutral Current ◽  
High Energy ◽  
New Physics ◽  
Coupling Constants ◽  
Current Status ◽  
Weak Neutral Current ◽  
Weak Mixing Angle ◽  
Precision Data ◽  
Moller Scattering

Precision measurements of weak neutral current amplitudes at [Formula: see text] are a sensitive probe of contact interactions arising from new high energy physics. Such measurements significantly enhance the analysis of precision data on the Z0 resonance, permitting tests of the running of the electroweak coupling constants. The behavior of the coupling constants as a function of Q2 can reveal the presence of many possible new physics scenarios, such as new gauge bosons, superparticles and substructure; some of these effects are difficult to observe on the Z0 pole. In order to probe energy scales up to 1 TeV, future low Q2 measurements must be precise enough to measure electroweak radiative corrections. Two experimental programs which aim to reach this sensitivity are deep inelastic neutrino nucleon scattering and atomic parity violation experiments. Another important technique is polarized electron scattering off unpolarized targets. We review the current status and future prospects of such measurements. We present an experimental design to measure the left-right parity violating asymmetry in polarized Møller scattering (e−e−→e−e−), which could constitute the most precise measurement of the weak mixing angle [Formula: see text] at [Formula: see text].

Sign in / Sign up

Export Citation Format

Share Document