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High Energy Physics - Phenomenology

New submissions

[ total of 31 entries: 1-31 ]
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New submissions for Thu, 22 Feb 18

[1]  arXiv:1802.07269 [pdf, other]
Title: Late-time magnetogenesis driven by ALP dark matter and dark photon
Comments: 6 pages, 2 figures
Subjects: High Energy Physics - Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO)

We propose a mechanism which generates primordial magnetic fields after the $e^+e^-$ annihilations. Our mechanism involves an ultra-light axion-like particle (ALP) which constitutes the dark matter, and a dark $U(1)_X$ gauge boson introduced to bypass the obstacle placed by the conductivity of cosmic plasma. In our scheme, coherently oscillating ALP amplifies the dark photon field, and part of the amplified dark photon field is concurrently converted to the ordinary magnetic field through the ALP-induced magnetic mixing. For the relevant ALP mass range $10^{-21} {\rm eV}\lesssim m_\phi\lesssim 10^{-17}{\rm eV}$, our mechanism can generate $B\sim 10^{-24} \,(m_\phi/10^{-17} {\rm eV})^{5/4}\,{\rm G}$ with a coherent length $\lambda \sim (m_\phi/10^{-17} {\rm eV})^{-1/2}$ kpc, which is large enough to provide a seed of the galactic magnetic fields. The mechanism also predicts a dark $U(1)_X$ electromagnetic field $E_X \sim B_X\sim 10\,(m_\phi/10^{-17}{\rm eV})^{-1/4}{\rm nG}$, which can result in interesting astrophysical/cosmological phenomena by inducing the mixings between the ALP, ordinary photon, and dark photon states.

[2]  arXiv:1802.07273 [pdf, other]
Title: Axion interferometry
Comments: 5 pages, 5 figures
Subjects: High Energy Physics - Phenomenology (hep-ph)

We propose using interferometry of circularly polarized light as a mechanism by which to test for axion dark matter. These interferometers differ from standard interferometers only by the addition of a few quarter waveplates to preserve the polarization of light upon reflection. We show that using current technology, interferometers can probe new regions of axion parameter space up to a couple orders of magnitude beyond current constraints.

[3]  arXiv:1802.07339 [pdf, ps, other]
Title: Exclusive and diffractive $μ^+ μ^-$ production in $pp$ collisions at the LHC
Comments: 9 pages, 6 figures, 3 tables. arXiv admin note: text overlap with arXiv:1705.08834
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)

In this paper we estimate the production of dimuons ($\mu^+ \mu^-$) in exclusive photon -- photon ($\gamma \gamma$) and diffractive Pomeron - Pomeron $(I\!P I\!P)$, Pomeron - Reggeon $(I\!P I\!R)$ and Reggeon - Reggeon $(I\!R I\!R)$ interactions in $pp$ collisions at the LHC energy. The invariant mass, rapidity and tranverse momentum distributions are calculated using the Forward Physics Monte Carlo (FPMC), which allows to obtain realistic predictions for the dimuon production with two leading intact hadrons. In particular, predictions taking into account the CMS and LHCb acceptances are presented. Moreover, the contribution of the single diffraction for the dimuon production also is estimated. Our results demonstrate that the experimental separation of these different mechanisms is feasible. In particular, the events characterized by pairs with large squared transverse momentum are dominated by diffractive interactions, which allows to investigate the underlying assumptions present in the description of these processes.

[4]  arXiv:1802.07365 [pdf, ps, other]
Title: Lorentz-violating contributions to the nuclear Schiff moment and nuclear EDM
Comments: 8 pages, revtex style, to appear in Phys. Rev. D
Subjects: High Energy Physics - Phenomenology (hep-ph)

In the context of an atom endowed with nuclear EDM, we consider the effects on the Schiff moment of $CPT$-even Lorentz-violating (LV) terms that modify the Coulomb potential. First, we study the modifications on the Schiff moment when the nucleus interacts with the electronic cloud by means of a Coulomb potential altered only by the $P$-even LV components. Next, by supposing the existence of an additional intrinsic LV EDM generated by other LV sources, we assess the corrections to the Schiff moment when the interaction nucleus-electrons runs mediated by a Coulomb potential modified by both the $P$-odd and $P$-even LV components. We then use known estimates and EDM measurements to discuss upper bounds on the new Schiff moment components and the possibility of a nuclear EDM component ascribed to LV effects.

[5]  arXiv:1802.07478 [pdf, other]
Title: Neutrino astrophysics and its connections to nuclear physics
Comments: 7 pages, 1 figure, Proceedings of the "Conference on Neutrino and Nuclear Physics (CNNP2017), 15-21 October, Catania
Subjects: High Energy Physics - Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)

We highlight recent developments in neutrino astrophysics. We discuss some of the connections with nuclear physics.

[6]  arXiv:1802.07498 [pdf, other]
Title: ALP production through non-linear Compton scattering in intense fields
Comments: 23 pages, 14 figures
Subjects: High Energy Physics - Phenomenology (hep-ph)

We derive production yields for massive pseudo-scalar and scalar axion-like-particles (ALPs), through non-linear Compton scattering of an electron in the background of low- and high-intensity electromagnetic fields. In particular, we focus on electromagnetic fields from Gaussian plane wave laser pulses. A detailed study of the angular distributions and effects of the scalar and pseudo-scalar masses is presented. It is shown that ultra-relativistic seed electrons can be used to produce scalars and pseudo-scalars with masses up to the order of the electron mass. We briefly discuss future applications of this work towards lab-based searches for light beyond-the-Standard-Model particles.

[7]  arXiv:1802.07507 [pdf, ps, other]
Title: Electron-seeded ALP production and ALP decay in an oscillating electromagnetic field
Authors: B. King
Comments: 7 pages, 4 figures
Subjects: High Energy Physics - Phenomenology (hep-ph); Optics (physics.optics); Plasma Physics (physics.plasm-ph)

Certain models involving ALPs (axion-like-particles) allow for the coupling of scalars and pseudoscalars to fermions. A derivation of the total rate for production of massive scalars and pseudoscalars by an electron in a monochromatic, circularly-polarised electromagnetic background is presented. In addition, a derivation and the total rate for the decay of massive scalars and pseudoscalars into electron-positron pairs in the same electromagnetic background is given. We conclude by approximating the total yield of ALP production for a typical laser-particle experimental scenario.

[8]  arXiv:1802.07616 [pdf, other]
Title: Constraining the Higgs self couplings at $e^+e^-$ colliders
Comments: 44 pages, 24 figures
Subjects: High Energy Physics - Phenomenology (hep-ph)

We study the sensitivity to the shape of the Higgs potential of single, double, and triple Higgs production at future $e^+e^-$ colliders. Physics beyond the Standard Model is parameterised through the inclusion of higher-dimensional operators $(\Phi^\dagger \Phi- v^2/2)^n/\Lambda^{(2n-4)}$ with $n=3,4$, which allows a consistent treatment of independent deviations of the cubic and quartic self couplings beyond the tree level. We calculate the effects induced by a modified potential up to one loop in single and double Higgs production and at the tree level in triple Higgs production, for both $Z$ boson associated and $W$ boson fusion production mechanisms. We consider two different scenarios. First, the dimension six operator provides the dominant contribution (as expected, for instance, in a linear EFT); we find in this case that the corresponding Wilson coefficient can be determined at $\mathcal{O}(10\%)$ accuracy by just combining accurate measurements of single Higgs cross sections at $\sqrt{\hat s}=$240-250 GeV and double Higgs production in $W$ boson fusion at higher energies. Second, both operators of dimension six and eight can give effects of similar order, i.e., independent quartic self coupling deviations are present. Constraints on Wilson coefficients can be best tested by combining measurements from single, double and triple Higgs production. Given that the sensitivity of single Higgs production to the dimension eight operator is presently unknown, we consider double and triple Higgs production and show that combining their information colliders at higher energies will provide first coarse constraints on the corresponding Wilson coefficient.

[9]  arXiv:1802.07620 [pdf, other]
Title: Angular and polarization trails from effective interactions of Majorana neutrinos at the LHeC
Comments: 22 pages, 13 figures
Subjects: High Energy Physics - Phenomenology (hep-ph)

We study the possibility of the LHeC facility to disentangle different new physics contributions to the production of heavy sterile Majorana neutrinos in the lepton number violating channel $e^{-}p\rightarrow l_{j}^{+} + 3 jets$ ($l_j\equiv e ,\mu $). This is done investigating the angular and polarization trails of effective operators with distinct Dirac-Lorentz structure contributing to the Majorana neutrino production, which parameterize new physics from a higher energy scale. We study an asymmetry in the angular distribution of the final anti-lepton and the initial electron polarization effect on the number of signal events produced by the vectorial and scalar effective interactions, finding both analyses could well separate their contributions.

[10]  arXiv:1802.07688 [pdf, ps, other]
Title: Generalized Wandzura Wilczek Relations and Orbital Angular Momentum
Comments: 5 pages, talk presented at QCD Evolution 2017, 22-16 May 2017, Jefferson Lab, Newport News, VA-USA
Subjects: High Energy Physics - Phenomenology (hep-ph)

New Lorentz Invariance Relations (LIRs) were presented between twist-three Generalized Parton Distributions (GPDs) and transverse momentum, $k_T$, moments of twist-two Generalized Transverse Momentum-Dependent Distributions (GTMDs). By implementing both these LIRs and the QCD Equations of Motion in the quark quark correlation function, we generated a new series of Wandzura Wilczek (WW) relations in the off-forward sector. Two of these WW relations take on a particularly interesting physical meaning in that they provide a clear interpretation of the QCD structure of Orbital Angular Momentum (OAM) in the nucleon. In particular, they provide a solution to the outstanding puzzle of how OAM could be simultaneously described by twist-two GTMDs and twist-three GPDs. Additional relations were discussed, in particular, for the helicity configurations that can be detected analyzing specific spin asymmetries: one corresponding to a longitudinally polarized quark in an unpolarized proton, associated with spin-orbit correlations, and one for transverse proton polarization, as a generalization of the relation obeyed by the $g_2$ structure function; finally, we defined a relation connecting the off-forward extension of the Sivers function to an off-forward Qiu-Sterman term.

[11]  arXiv:1802.07690 [pdf, other]
Title: Strong thermal $SO(10)$-inspired leptogenesis in the light of recent results from long-baseline neutrino experiments
Comments: 20 pages, 5 figures. arXiv admin note: text overlap with arXiv:1705.01935
Subjects: High Energy Physics - Phenomenology (hep-ph)

We confront recent experimental results on neutrino mixing parameters with the requirements from strong thermal $SO(10)$-inspired leptogenesis, where the asymmetry is produced from next-to-lightest right-handed neutrinos $N_2$ and is independent of initial conditions. There is a nice agreement with latest global analyses supporting $\sin\delta < 0$ and normal ordering at $ \sim 95\%$ C.L. On the other hand, the more stringent experimental lower bound on the atmospheric mixing angle starts to corner strong thermal $SO(10)$-inspired leptogenesis. Prompted and encouraged by this rapid experimental advance, we obtain a precise determination of the allowed region in the plane $\delta$ versus $\theta_{23}$. We confirm that for the benchmark case $\alpha_2 \equiv m_{D2} / m_{\rm charm}= 5 \, $, where $m_{D2}$ is the intermediate neutrino Dirac mass setting the mass of $N_2$, and initial pre-existing $B-L$ asymmetry $N_{B-L}^{\rm p, i} = 10^{-3}$, the bulk of the solutions lies in the first octant. Though most of the solutions are found outside the $95\%$ C.L. experimental region, there is still a big allowed fraction that does not require a too fine-tuned choice of the Majorana phases so that the neutrinoless double beta decay effective neutrino mass allowed range is still $m_{ee}\simeq [10,30]\,{\rm meV}$. We also show how the constraints depend on $N_{B-L}^{\rm p, i}$ and $\alpha_2$. In particular, the current best fit, ($\theta_{23},\delta)\simeq (47^{\circ}, -130^{\circ})$, can be reproduced for $\alpha_2 =6$, a value obtained recently in a few realistic fits. Finally, we also obtain that current neutrino data rule out values $N_{B-L}^{\rm p, i} \gtrsim 0.1$ for $\alpha_2 \lesssim 5$.

[12]  arXiv:1802.07711 [pdf, ps, other]
Title: The electromagnetic multipole moments of the charged open-flavor $Z_{\bar cq}$ states
Authors: K. Azizi, U. Ozdem
Comments: 11 pages, 2 figures and 2 tables
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex); High Energy Physics - Lattice (hep-lat)

The electromagnetic multipole moments of the open-flavor $Z_{\bar cq}$ states are investigated by assuming a diquark-antidiquark picture for their internal structure and quantum numbers $J^{PC} = 1^{+-}$ for their spin-parity. In particular, their magnetic and quadrupole moments are extracted in the framework of light-cone QCD sum rule by the help of the photon distribution amplitudes. The electromagnetic multipole moments of the open-flavor $Z_{\bar cq}$ states are important dynamical observables, which encode valuable information on their underlying structure. The results obtained for the magnetic moments of different structures are considerably large and can be measured in future experiments. We obtain very small values for the quadrupole moments of $Z_{\bar cq}$ states indicating a nonspherical charge distribution.

[13]  arXiv:1802.07720 [pdf, other]
Title: Dark quarkonium formation in the early universe
Comments: 28 pages, 11 figures
Subjects: High Energy Physics - Phenomenology (hep-ph)

The relic abundance of heavy stable particles charged under a confining gauge group can be depleted by a second stage of annihilations near the deconfinement temperature. This proceeds via the formation of quarkonia-like states, in which the heavy pair subsequently annihilates. The size of the quarkonium formation cross section was the subject of some debate. We estimate this cross section in a simple toy model. The dominant process can be viewed as a rearrangement of the heavy and light quarks, leading to a geometric cross section of hadronic size. In contrast, processes in which only the heavy constituents are involved lead to mass-suppressed cross sections. These results apply to any scenario with bound states of sizes much larger than their inverse mass, such as U(1) models with charged particles of different masses, and can be used to construct ultra-heavy dark-matter models with masses above the na\"ive unitarity bound. They are also relevant for the cosmology of any stable colored relic.

Cross-lists for Thu, 22 Feb 18

[14]  arXiv:1802.06733 (cross-list from gr-qc) [pdf, other]
Title: Gravitational Wave Emission from Collisions of Compact Scalar Solitons
Comments: 8 Pages, 8 figures, movies : this https URL
Subjects: General Relativity and Quantum Cosmology (gr-qc); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)

We numerically investigate the gravitational waves generated by the head-on collision of equal-mass, self-gravitating, real scalar field solitons (oscillatons) as a function of their compactness $\mathcal{C}$. We show that there exist three different possible outcomes for such collisions: (1) an excited stable oscillaton for low $\mathcal{C}$, (2) a merger and formation of a black-hole for intermediate $\mathcal{C}$, and (3) a pre-merger collapse of both oscillatons into individual black-holes for large $\mathcal{C}$. For (1), the excited, aspherical oscillaton continues to emit gravitational waves. For (2), the total energy in gravitational waves emitted increases with compactness, and possesses a maximum which is greater than that from the merger of a pair of equivalent mass black-holes. The initial amplitudes of the quasi-normal modes in the post-merger ring-down in this case are larger than that of corresponding mass black-holes -- potentially a key observable to distinguish black-hole mergers with their scalar mimics. For (3), the gravitational wave output is indistinguishable from a similar mass, black-hole--black-hole merger.

[15]  arXiv:1802.07675 (cross-list from hep-th) [pdf, ps, other]
Title: Exact Correlators from Conformal Ward Identities in Momentum Space and the Perturbative $TJJ$ Vertex
Comments: 59 pages, 1 Figure
Subjects: High Energy Physics - Theory (hep-th); High Energy Physics - Phenomenology (hep-ph)

We present a general study of 3-point functions of conformal field theory in momentum space, following a reconstruction method for tensor correlators, based on the solution of the conformal Ward identities (CWI' s), introduced in recent works by Bzowski, McFadden and Skenderis (BMS). We investigate and detail the structure of the CWI's and their non-perturbative solutions, and compare them to perturbation theory, taking QED as an example. In a first part we address in full generality some methodological issues emerging when re-expressing the conformal generators in momentum space from position space, filling a gap in the related literature. Such are the violation of the Leibniz rule and the treatment of the derivative of the Dirac $\delta$ terms related to conservation of the total momentum, induced by the Fourier transform. We present a complete discussion of this transition. We then proceed with an analysis of the $TJJ$ correlator, presenting independent and detailed re-derivations of the conformal equations in the reconstruction method of BMS, originally formulated using a minimal tensor basis in the transverse traceless sector. Our results are then exemplified in massless QED at one-loop in $d$-dimensions expressed in terms of master integrals. The action of the conformal generators on the $TJJ$ in $d$-dimensions is directly worked out on the corresponding master integrals. We show how the conformal constraints are explicitly imposed and solved in such perturbative realization of the conformal equations in their exact $d$-dimensional form and in their anomalous forms in $d=4$ after renormalization.

Replacements for Thu, 22 Feb 18

[16]  arXiv:1506.02660 (replaced) [pdf, other]
Title: Fully differential VBF Higgs production at NNLO
Comments: 5 pages, 2 figures, Version 2: Inclusion of bugfix of NLO H+3jet virtual corrections
Journal-ref: Phys. Rev. Lett. 115, 082002 (2015)
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
[17]  arXiv:1703.00343 (replaced) [pdf, other]
Title: Light Neutralino Dark Matter in the NMSSM
Comments: 13 pp, plots and refs added; Modified conclusion based on wider parameter ranges
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
[18]  arXiv:1706.02502 (replaced) [pdf, other]
Title: Colorphilic Spin-2 Resonances in the LHC Dijet Channel
Comments: 23 pages, 4 figures, updated notation and figures
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
[19]  arXiv:1706.05007 (replaced) [pdf, other]
Title: On the robustness of the primordial power spectrum in renormalized Higgs inflation
Comments: 12 pages, 8 figures - matches the published version
Journal-ref: JCAP02(2018)040
Subjects: High Energy Physics - Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics - Theory (hep-th)
[20]  arXiv:1706.09735 (replaced) [pdf, other]
Title: Loop inflection-point inflation
Comments: 4 pages, 1 figure. Additional graph and sectioning
Subjects: High Energy Physics - Phenomenology (hep-ph)
[21]  arXiv:1709.05128 (replaced) [pdf, ps, other]
Title: Dark matter scenarios with multiple spin-2 fields
Comments: 30 pages, 4 figures; comments of referee implemented, matches published version
Subjects: High Energy Physics - Theory (hep-th); Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph)
[22]  arXiv:1709.05962 (replaced) [pdf, ps, other]
Title: Electromagnetic fields in small systems from a multiphase transport model
Comments: 7 pages, 10 figures; final published version
Journal-ref: Phys. Rev. C 97, 024910 (2018)
Subjects: High Energy Physics - Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
[23]  arXiv:1710.04360 (replaced) [pdf, other]
Title: Status of Sterile Neutrino fits with Global Data
Authors: Alejandro Diaz
Comments: Talk presented at the APS Division of Particles and Fields Meeting (DPF 2017), July 31-August 4, 2017, Fermilab. C170731
Subjects: High Energy Physics - Experiment (hep-ex); High Energy Physics - Phenomenology (hep-ph)
[24]  arXiv:1711.03319 (replaced) [pdf, other]
Title: Parton Shower and NLO-Matching uncertainties in Higgs Boson Pair Production
Subjects: High Energy Physics - Phenomenology (hep-ph)
[25]  arXiv:1711.04344 (replaced) [pdf, other]
Title: Trident pair production in plane waves: Coherence, exchange, and spacetime inhomogeneity
Comments: Version 2: To appear in PRD, misprints corrected, minor changes to improve presentation, slight change of the title. 27 pages, 15 figures
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)
[26]  arXiv:1711.11376 (replaced) [pdf, other]
Title: Model-independent analysis of the DAMPE excess
Comments: 28 pages, 5 figures and 2 tables. v2: references added. v3: minor changes, matches published version
Journal-ref: JHEP02(2018)121
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE)
[27]  arXiv:1712.03527 (replaced) [pdf, other]
Title: Mass scale of vectorlike matter and superpartners from IR fixed point predictions of gauge and top Yukawa couplings
Comments: 31 pages, 9 figures, typos corrected, matches the published version
Subjects: High Energy Physics - Phenomenology (hep-ph)
[28]  arXiv:1712.04956 (replaced) [pdf, other]
Title: Higgs-Dilaton Cosmology: An inflation - dark energy connection and forecasts for future galaxy surveys
Comments: 17 pages, 7 figures, added forecasts for DESI - matches the published version
Journal-ref: Phys. Rev. D 97, 043520 (2018)
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph)
[29]  arXiv:1801.04604 (replaced) [pdf]
Title: Dynamical Symmetry Breaking by SU(2) Gauge Bosons
Authors: F. J. Himpsel
Comments: 17 pages, 2 figures. Versions 2,3: added Ref. [15], augmented Appendix B, clarified the text
Subjects: High Energy Physics - Phenomenology (hep-ph)
[30]  arXiv:1801.09722 (replaced) [pdf, other]
Title: Status of Flavour Maximal Non-minimal Universal Extra Dimension
Comments: 22 pages, 6 figures, 4 tables; added discussion on $R_{K*}$; added references
Subjects: High Energy Physics - Phenomenology (hep-ph)
[31]  arXiv:1802.04998 (replaced) [pdf, ps, other]
Title: Interacting hadron resonance gas model in K-matrix formalism
Comments: With updated references
Subjects: Nuclear Theory (nucl-th); High Energy Physics - Phenomenology (hep-ph)
[ total of 31 entries: 1-31 ]
[ showing up to 2000 entries per page: fewer | more ]

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