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Differential measurement of trident production in strong electromagnetic fields / Nielsen, Christian F. (Aarhus U.) ; Holtzapple, Robert (Cal. Poly.) ; Lund, Mads M. (Aarhus U.) ; Surrow, Jeppe H. (Aarhus U.) ; Sørensen, Allan H. (Aarhus U.) ; Sørensen, Marc B. (Aarhus U.) ; Uggerhøj, Ulrik I. (Aarhus U.) /CERN NA63 Collaboration
In this paper, we present experimental results and numerical simulations of trident production, $e^-\rightarrow e^-e^+e^-$, in a strong electromagnetic field. The experiment was conducted at CERN for the purpose of probing the strong-field parameter $\chi$ up to 2.4, using a 200 GeV electron beam penetrating a 400 $\mu$m thick germanium crystal oriented along the $\langle 110\rangle$ axis. [...]
arXiv:2307.03464.- 2023-09-01 - 29 p. - Published in : Phys. Rev. D 108 (2023) 052013 Fulltext: Publication - PDF; 2307.03464 - PDF;

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Precision Measurement of Trident Production in Strong Electromagnetic Fields / Nielsen, Christian F. (Aarhus U.) ; Holtzapple, Robert (Cal. Poly.) ; Lund, Mads M. (Aarhus U.) ; Surrow, Jeppe H. (Aarhus U.) ; Sørensen, Marc B. (Aarhus U.) ; Uggerhøj, Ulrik I. (Aarhus U.) /NA63 Collaboration
We demonstrate experimentally that the trident process $e^-\rightarrow e^-e^+e^-$ in a strong external field, with a spatial extension comparable to the effective radiation length, is well understood theoretically. The experiment, conducted at CERN, probes values for the strong field parameter $\chi$ up to 2.4. [...]
arXiv:2211.02390.- 2023-02-14 - 5 p. - Published in : Phys. Rev. Lett. 130 (2023) 071601 Fulltext: 2211.02390 - PDF; Publication - PDF;

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Discovering heavy neutrino oscillations in rare $B^\pm_c$ meson decays at HL-LHCb / Tapia, Sebastian (Iowa State U.) ; Vidal-Bravo, Marcelo (Andres Bello Natl. U. ; Unlisted, CL) ; Zamora-Saa, Jilberto (Andres Bello Natl. U. ; Unlisted, CL)
In this work, we study the lepton flavor and lepton number violating $B_{c}$ meson decays via two intermediate on-shell Majorana neutrinos $N_j$ into two charged leptons and a charged pion $B_{c}^{\pm} \to \mu^{\pm} \ N_j \to \mu^{\pm} \tau^{\pm} \pi^{\mp}$. We evaluated the possibility to measure the modulation of the decay width along the detector length produced as a consequence of the lepton flavor violating process, in a scenario where the heavy neutrinos masses range between $2.0$ GeV $\leq M_N \leq 6.0$ GeV. [...]
arXiv:2109.06027.- 2022-02-01 - 15 p. - Published in : Phys. Rev. D 105 (2022) 035003 Fulltext: PhysRevD.105.035003 - PDF; 2109.06027 - PDF;

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Design and performance of a novel low energy multispecies beamline for an antihydrogen experiment / ALPHA Collaboration
The ALPHA Collaboration, based at the CERN Antiproton Decelerator, has recently implemented a novel beamline for low-energy ($\lesssim$ 100 eV) positron and antiproton transport between cylindrical Penning traps that have strong axial magnetic fields. Here, we describe how a combination of semianalytical and numerical calculations were used to optimise the layout and design of this beamline. [...]
arXiv:2211.09838.- 2023-04-03 - 15 p. - Published in : Phys. Rev. Accel. Beams 26 (2023) 040101 Fulltext: 2211.09838 - PDF; Publication - PDF;

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Probing Neutral Triple Gauge Couplings at the LHC and Future Hadron Colliders / Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn ; Tsung-Dao Lee Inst., Shanghai ; SKLPPC, Shanghai) ; He, Hong-Jian (Tsung-Dao Lee Inst., Shanghai ; SKLPPC, Shanghai ; Tsinghua U., Beijing ; Tsinghua U., Beijing, CHEP) ; Xiao, Rui-Qing (King's Coll. London ; Tsung-Dao Lee Inst., Shanghai ; SKLPPC, Shanghai)
We study probes of neutral triple gauge couplings (nTGCs) at the LHC and the proposed 100TeV $pp$ colliders, and compare their sensitivity reaches with those of the proposed $e^+ e^-$ colliders. The nTGCs provide a unique window to the new physics beyond the Standard Model (SM) because they can arise from SM effective field theory (SMEFT) operators that respect the full electroweak gauge group $SU(2)_L\otimes U(1)_Y$ of the SM only at the level of dimension-8 or higher. [...]
arXiv:2206.11676; KCL-PH-TH/2022-35; CERN-TH-2022-089.- 2023-02-01 - 57 p. - Published in : Phys. Rev. D 107 (2023) 035005 Fulltext: 2206.11676 - PDF; Publication - PDF;

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Neutrino Detection without Neutrino Detectors: Discovering Collider Neutrinos at FASER with Electronic Signals Only / Arakawa, Jason (Delaware U. ; UC, Irvine) ; Feng, Jonathan L. (UC, Irvine) ; Ismail, Ahmed (Oklahoma State U.) ; Kling, Felix (DESY) ; Waterbury, Michael (Technion)
The detection of collider neutrinos will provide new insights about neutrino production, propagation, and interactions at TeV energies, the highest human-made energies ever observed. During Run 3 of the LHC, the FASER experiment is expected to detect roughly $10^4$ collider neutrinos using its emulsion-based neutrino detector FASER$\nu$. [...]
arXiv:2206.09932; DESY-22-101; UCI-TR-2022-09.- 2022-09-01 - 16 p. - Published in : Phys. Rev. D 106 (2022) 052011 Fulltext: PhysRevD.106.052011 - PDF; 2206.09932 - PDF;

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Dynamically Induced Topological Inflation / Choi, Gongjun (CERN) ; Lin, Weikang (Tsung-Dao Lee Inst., Shanghai) ; Yanagida, Tsutomu T. (Tsung-Dao Lee Inst., Shanghai ; Tokyo U., IPMU)
We propose an inflation model in which the inflationary era is driven by the strong dynamics of $Sp(2)$ gauge theory. The quark condensation in the confined phase of $Sp(2)$ gauge theory generates the inflaton potential comparable to the energy of the thermal bath at the time of phase transition. [...]
arXiv:2204.03675; CERN-TH-2022-061.- 2023-02-01 - 5 p. - Published in : Phys. Rev. D 107 (2023) 036005 Fulltext: 2204.03675 - PDF; Publication - PDF;

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Generic Tests of <math display="inline"><mi>C</mi><mi>P</mi></math> Violation in High-<math display="inline"><msub><mi>p</mi><mi>T</mi></msub></math> Multilepton Signals at the LHC and Beyond / Afik, Yoav (CERN) ; Bar-Shalom, Shaouly (Technion) ; Pal, Kuntal (UC, Riverside) ; Soni, Amarjit (Brookhaven) ; Wudka, Jose (UC, Riverside)
We introduce a modification to the standard expression for tree-level CP-violation in scattering processes at the LHC, which is important when the initial state in not self-conjugate. Based on that, we propose a generic and model-independent search strategy for probing tree-level CP-violation in inclusive multi-lepton signals. [...]
arXiv:2212.09433.- 2023-10-23 - 8 p. - Published in : Phys. Rev. Lett. 131 (2023) 171801 Fulltext: 2212.09433 - PDF; Publication - PDF;

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$(J/\psi, J/\psi)$, and $(\eta_c, \eta_c)$ production through two intermediate photons in electron-positron annihilation at B-factories / Bhatnagar, Shashank (Delhi U.) ; Negash, Hluf (Samara U.)
We study the processes, $e^- e^+ \rightarrow \gamma^* \gamma^* \rightarrow J/\psi +J/\psi$, and $e^- e^+ \rightarrow \gamma^* \gamma^* \rightarrow \eta_c+ \eta_c$ at $\sqrt{s}=10.6$ GeV in the framework of $4\times 4$ Bethe-Salpeter equation. For $J/\psi+J/\psi$ production, the dominant contribution is through fragmentation process, while for $\eta_c+\eta_c$ production, the quark rearrangement diagrams contribute. [...]
arXiv:2406.07508; CERN-TH-2024-081.- 2024-10-15 - 11 p. - Published in : Nucl. Phys. A 1053 (2025) 122969 Fulltext: PDF;

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Discovering true tauonium via two-photon fusion at $e^+e^-$ and hadron colliders / d'Enterria, David (CERN) ; Shao, Hua-Sheng (Paris, LPTHE)
The feasibility of observing true tauonium, the bound state of two tau leptons, $\mathcal{T}_0\equiv(\tau^+\tau^-)_0$, via photon-photon collisions at $e^+e^-$ colliders and at the LHC, is studied. The production cross sections of the process $\gamma\gamma\to\mathcal{T}_0\to\gamma\gamma$-- as well as those of all relevant backgrounds: spin-0 and 2 charmonium resonances decaying to diphotons, and light-by-light scattering -- are computed in the equivalent photon approximation for $e^+e^-$ collisions at BES III ($\sqrt{s} = 3.8$ GeV), Belle II ($\sqrt{s} = 10.6$ GeV), and FCC-ee ($\sqrt{s} = 91.2$ GeV), as well as for ultraperipheral p-p, p-Pb, and Pb-Pb collisions at the LHC. [...]
arXiv:2202.02316.- 2022-05-01 - 9 p. - Published in : Phys. Rev. D 105 (2022) 093008 Fulltext: PDF;

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