Compton-like dark photon production in electron-nucleus collisions

2021 ◽  
Author(s):  
C.P. Oliveira ◽  
D. Hadjimichef ◽  
Magno V. T. Machado
Keyword(s):  
Mass Range ◽  
Heavy Ion ◽  
Dark Photon ◽  
Ion Collisions ◽  
Ultrarelativistic Electron ◽  
Mixing Parameter ◽  
The Standard Model ◽  
Integrated Cross Section ◽  
Event Rates ◽  
Mass Interval

Abstract The Compton-like production of massive dark photons is investigated in ultrarelativistic electron-ion collisions considering the kinetic mixing between the dark photon and the Standard Model photon. The quasi-real photons in the heavy ion are described by the EPA approximation and the model is employed to calculate the integrated cross section and event rates as a function of the dark photon mass, mγ′, and mixing parameter, ε. Predictions are shown for electron-ion colliders (EICs) in the mass range 100 ≤ mγ′ ≤ 500 MeV. Numerical results are provided within the kinematic coverage of the planned machines Electron-ion collider in China (EicC), A Polarized Electron-Ion Collider at Jefferson Lab (JLEIC), Electron Ion Collider/USA (EIC), Large Hadron Electron Collider (LHeC) and Future Circular Collider (FCC-eA). It complements existing search strategies for dark photons in the considered mass interval.

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 Dielectron Production in Proton–Proton Collisions at √s=7 TeV with ALICE

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 24
Author(s):  
Sebastian Scheid
Keyword(s):  
Cross Sections ◽  
Mass Range ◽  
Heavy Ion ◽  
Event Generator ◽  
Leading Order ◽  
Proton Proton ◽  
Total Cross Sections ◽  
Proton Collisions ◽  
Ion Collisions ◽  
Proton Proton Collisions

The ALICE Collaboration measured dielectron production as a function of the invariant mass ( m ee ), the pair transverse momentum ( p T , ee ) and the pair distance of closest approach ( DCA ee ) in pp collisions at s = 7 TeV. Prompt and non-prompt dielectron sources can be separated with the DCA ee , which will give the opportunity in heavy-ion collisions to identify thermal radiation from the medium in the intermediate-mass range dominated by contributions from open-charm and beauty hadron decays. The charm and beauty total cross sections are extracted from the data by fitting the spectra with two different MC generators, i.e., PYTHIA a leading order event generator and POWHEG a next-to-leading order event generator. Significant model dependences are observed, reflecting the sensitivity of this measurement to the heavy-flavour production mechanisms.

scholarly journals A Gas Target Internal to the LHC for the Study of pp Single-Spin Asymmetries and Heavy Ion Collisions

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Colin Barschel ◽  
Paolo Lenisa ◽  
Alexander Nass ◽  
Erhard Steffens
Keyword(s):  
Areal Density ◽  
Mass Range ◽  
Heavy Ion ◽  
Inert Gases ◽  
Spin Asymmetries ◽  
Single Spin ◽  
Ion Collisions ◽  
Gas Target ◽  
Single Spin Asymmetries ◽  
Target Experiment

We discuss the application of an open storage cell as gas target for a proposed LHC fixed-target experiment AFTER@LHC. The target provides a high areal density at minimum gas input, which may be polarized1H,2H, or3He gas or heavy inert gases in a wide mass range. For the study of single-spin asymmetries in pp interaction, luminosities of nearly 1033/cm2 s can be produced with existing techniques.

scholarly journals Pair production of new heavy leptons with U(1)′ charge at linear colliders

2014 ◽  
Vol 29 (11n12) ◽  
pp. 1450055 ◽  
Author(s):  
V. Arı ◽  
O. Çakır ◽  
S. Kuday
Keyword(s):  
Standard Model ◽  
Pair Production ◽  
Cross Sections ◽  
Production Cross ◽  
Center Of Mass ◽  
Mass Range ◽  
Mixing Parameter ◽  
The Standard Model ◽  
Linear Colliders ◽  
Heavy Leptons

We study the pair production of new heavy leptons within a new U(1)′ symmetry extension of the Standard Model. Because of the new symmetry, the production and decay modes of the new heavy leptons would be different from those of three families of the standard model. The pair production cross-sections depending on the mixing parameter and the mass of heavy leptons have been calculated for the center-of-mass energies of 0.5 TeV, 1 TeV and 3 TeV. The accessible ranges of the parameters have been obtained for different luminosity projections at linear colliders. The search can be performed within the range of mixing parameter -1<x<-0.35 and 0.05<x<1, given that the heavy lepton mass Ml′ = 400 GeV at [Formula: see text] and L int = 100 fb -1. We find the sensitivity to the range of mixing parameter -1<x<1 for the mass range Ml′<800 GeV at [Formula: see text] and L int = 100 fb -1.

scholarly journals Dark photon search at Yemilab, Korea

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
S. H. Seo ◽  
Y. D. Kim
Keyword(s):  
Electron Beam ◽  
Confidence Level ◽  
Particle Physics ◽  
Absorption Process ◽  
Neutrino Detector ◽  
Dark Sector ◽  
Dark Photon ◽  
Mixing Parameter ◽  
The Standard Model ◽  
Background Events

Abstract Dark photons are well motivated hypothetical dark sector particles that could account for observations that cannot be explained by the standard model of particle physics. A search for dark photons that are produced by an electron beam striking a thick tungsten target and subsequently interact in a 3 kiloton-scale neutrino detector in Yemilab, a new underground lab in Korea, is proposed. Dark photons can be produced by “darkstrahlung” or by oscillations from ordinary photons produced in the target and detected by their visible decays, “absorption” or by their oscillation to ordinary photons. By detecting the absorption process or the oscillation-produced photons, a world’s best sensitivity for measurements of the dark-photon kinetic mixing parameter of ϵ2> 1.5 × 10−13(6.1 × 10−13) at the 95% confidence level (C.L.) could be obtained for dark photon masses between 80 eV and 1 MeV in a year-long exposure to a 100 MeV–100 kW electron beam with zero (103) background events. In parallel, the detection of e+e− pairs from decays of dark photons with mass between 1 MeV and ∼86 MeV would have sensitivities of ϵ2>$$ \mathcal{O}\left({10}^{-17}\right)\left(\mathcal{O}\left({10}^{-16}\right)\right) $$ O 10 − 17 O 10 − 16 at the 95% C.L. with zero (103) background events. This is comparable to that of the Super-K experiment under the same zero background assumption.

scholarly journals Constraining dark photon properties with Asteroseismology

2019 ◽  
Vol 491 (1) ◽  
pp. 409-416
Author(s):  
Adrián Ayala ◽  
Ilidio Lopes ◽  
Antonio García Hernández ◽  
Juan Carlos Suárez ◽  
Íñigo Muñoz Elorza
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Matter Content ◽  
Solar Mass ◽  
Dark Photon ◽  
Mixing Parameter ◽  
The Standard Model ◽  
Red Giant ◽  
The Impact ◽  
The Universe

ABSTRACT Dark photons are particles invoked in some extensions of the Standard Model that could account for at least part of the dark matter content of the Universe. It has been proposed that the production of dark photons in stellar interiors could happen at a rate that depends on both, the dark photon mass and its coupling to Standard Model particles (the kinetic mixing parameter χ). In this work, we aim at exploring the impact of dark photon productions in the stellar core of solar mass red giant branch (RGB) stars during late evolutionary phases. We demonstrate that near the so-called RGB bump, dark photons production may be an energy sink for the star sufficiently significative to modify the extension of the star convective zones. We show that Asteroseismology is able to detect such variations in the structure, allowing us to predict an upper limit of $\rm 900\ eV$ and 5 × 10−15 for the mass and kinetic mixing of the dark photons, respectively. We also demonstrate that additional constraints can be derived from the fact that dark photons increase the luminosity of the RGB tip over the current observational uncertainties. This work thus paves the way for an empirical approach to deepen the study of such dark matter particles.

scholarly journals Constraints on the U(1)L gauge boson in a wide mass range

2016 ◽  
Vol 31 (11) ◽  
pp. 1650059 ◽  
Author(s):  
Yu Seon Jeong ◽  
C. S. Kim ◽  
Hye-Sung Lee
Keyword(s):  
Standard Model ◽  
Gauge Boson ◽  
Mass Range ◽  
Small Mass ◽  
Low Energy ◽  
Gauge Bosons ◽  
Dark Photon ◽  
The Standard Model ◽  
Similarities And Differences ◽  
New Discovery

There is a growing interest for the search of new light gauge bosons. The small mass of a new boson can turn various kinds of low-energy experiments to a new discovery machine, depending on their couplings to the Standard Model particles. It is important to understand the properties of each type of gauge boson and their current constraints for a given mass. While the dark photon (which couples to the electric charges) and the [Formula: see text] gauge boson have been well studied in an extensive mass range, the [Formula: see text] gauge boson has not been fully investigated yet. We consider the gauge boson of the [Formula: see text] in a wide mass range [Formula: see text] and investigate the constraints on its coupling from various experiments, discussing the similarities and differences from the dark photon and the [Formula: see text] gauge boson.

LOCAL VACUUM EXCITATIONS IN STRONG ELECTROMAGNETIC FIELDS?

1988 ◽  
Vol 03 (07) ◽  
pp. 1751-1757 ◽  
Author(s):  
ANDREAS SCHÄFER ◽  
BERNDT MÜLLER ◽  
WALTER GREINER
Keyword(s):  
Electromagnetic Fields ◽  
Electric Fields ◽  
Gluon Condensate ◽  
Vacuum State ◽  
Heavy Ion ◽  
Energy Scale ◽  
Ion Collisions ◽  
Electron Positron ◽  
The Standard Model ◽  
Text Component

We discuss the possibility that strong electromagnetic fields might induce local changes in the vacuum state of the standard model and argue that such states could have all the necessary properties to explain the coincident electron-positron lines observed at GSI. Two specific ideas are investigated. The first relies on the assumption that the Higgs-vacuum state is nearly destabilized by radiative corrections, so that the electric fields produced in heavy ion collisions are strong enough to induce a local phase transition. The second one relies on vacuum changes in the QCD sector. We propose a scenario in which the gluon condensate acquires a [Formula: see text] component and argue that this could change the energy scale of QCD, i.e. ΛQCD.

scholarly journals Dark photon bounds in the dark EFT

2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
Daniele Barducci ◽  
Enrico Bertuzzo ◽  
Giovanni Grilli di Cortona ◽  
Gabriel M. Salla
Keyword(s):  
Degrees Of Freedom ◽  
Dipole Interaction ◽  
Effective Field ◽  
Gauge Bosons ◽  
Abelian Gauge ◽  
Dark Photon ◽  
Mixing Parameter ◽  
The Standard Model ◽  
New States ◽  
Strength Tensor

Abstract Dark photons are massive abelian gauge bosons that interact with ordinary photons via a kinetic mixing with the hypercharge field strength tensor. This theory is probed by a variety of different experiments and limits are set on a combination of the dark photon mass and kinetic mixing parameter. These limits can however be strongly modified by the presence of additional heavy degrees of freedom. Using the framework of dark effective field theory, we study how robust are the current experimental bounds when these new states are present. We focus in particular on the possible existence of a dark dipole interaction between the Standard Model leptons and the dark photon. We show that, under certain assumptions, the presence of a dark dipole modifies existing supernovæ bounds for cut-off scales up to $$ \mathcal{O} $$ O (10–100 TeV). On the other hand, terrestrial experiments, such as LSND and E137, can probe cut-off scales up to $$ \mathcal{O} $$ O (3 TeV). For the latter experiment we highlight that the bound may extend down to vanishing kinetic mixing.

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