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2026-03-20
04:17
The gravitational S-matrix from the path integral: asymptotic symmetries and soft theorems / Isen, Jack (UCLA, Los Angeles (main)) ; Kraus, Per (UCLA, Los Angeles (main)) ; Monten, Ruben (CERN) ; Myers, Richard M. (Amsterdam U.)
We extend a previously developed formulation of the S-matrix, based on a path integral with asymptotic boundary conditions, to include gravity. [...]
CERN-TH-2026-044 ; arXiv:2603.17045. - 59.
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2026-03-20
04:17
$K π$ scattering as a step towards $B \to K^* \ell^+ \ell^-$ from Lattice QCD / Erben, Felix (CERN) ; Black, Matthew (U. Edinburgh (main)) ; Boyle, Peter (Brookhaven Natl. Lab. ; U. Edinburgh (main)) ; Di Carlo, Matteo (CERN) ; Gülpers, Vera (U. Edinburgh (main)) ; Hansen, Maxwell T. (U. Edinburgh (main)) ; Lachini, Nelson Pitanga (Cambridge U. (main)) ; Mukherjee, Rajnandini (U. Edinburgh (main)) ; Portelli, Antonin (U. Edinburgh (main)) ; Tsang, J. Tobias (U. Liverpool (main))
Rare $b\to s\ell^+\ell^-$ decays provide some of the most sensitive tests of the Standard Model and require precise and systematically improvable hadronic input from lattice QCD. [...]
CERN-TH-2026-053 ; arXiv:2603.17900. -
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2026-03-19
16:17
Combined effective field theory interpretation of measurements sensitive to quartic gauge boson couplings in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
A combination of measurements sensitive to anomalous quartic electroweak gauge boson couplings is presented using proton-proton collision data collected by the ATLAS detector at $\sqrt{s} = 13$ TeV at the LHC. [...]
CERN-EP-2026-076. - 2026
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2026-03-19
11:27
Measurement of hadronic form-factor parameters with an angular analysis of $B^0 \rightarrow D^{*-} \mu^{+} \nu_{\mu}$ decays /LHCb Collaboration
The hadronic form-factor parameters of the $B^{0}\to D^{\ast-} \mu^{+} \nu_\mu$ decay are determined from a differential analysis of the decay rate in dilepton momentum squared, $q^2$, the three helicity angles and the squared invariant mass of the visible system, $m^2_{miss}$. The data sample used corresponds to an integrated luminosity of 3.0 fb$^{-1}$ collected by the LHCb experiment in proton-proton collisions at centre-of-mass energies 7 TeV and 8 TeV [...]
LHCb-CONF-2026-001; CERN-LHCb-CONF-2026-001.- Geneva : CERN, 2026 - mult.p. Fulltext: LHCb-CONF-2026-001 - PDF; LHCb-CONF-2026-001-figures - ZIP;
In : 60th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, It, 15 - 22 Mar 2026

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2026-03-19
04:06
Shocks from Exploding Primordial Black Holes in the Early Universe / Vanvlasselaer, Miguel (Brussels U., IIHE ; U. Barcelona (main)) ; Trifinopoulos, Sokratis (MIT ; CERN ; Zurich U.) ; Klipfel, Alexandra P. (MIT) ; Kaiser, David I. (MIT)
We investigate how Hawking radiation from low-mass primordial black holes deposits energy into the early-universe plasma and show that the resulting phenomena are hydrodynamic rather than purely diffusive. [...]
CERN-TH-2026-048 ; MIT-CTP/5978 ; arXiv:2603.15746. - 34.
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2026-03-19
04:03
Latin American HECAP Physics Briefing Book 2025 / Acero, Mario A. (U. Atlantico, Barranquilla) ; Aguilar-Arevalo, Alexis A. (UNAM, Mexico) ; Andrada, Belén (Buenos Aires, CONICET) ; Larriva, Andrés Baquero (U. del Azuay, Cuenca) ; Cambiaso, Mauro (Andres Bello Natl. U.) ; Carrera, Edgar (San Francisco de Quito U.) ; Cruz, Melissa (Honduras U.) ; Duarte, Lucía (Republica U., Montevideo) ; Estrada, Juan (Brookhaven) ; Gago, Alberto (Lima, Pont. U. Catolica) et al.
The first process for the Latin American Strategy Forum for Research Infrastructure for High Energy, Cosmology and Astroparticle Physics (LASF4RI-HECAP) came to a conclusion in October 2020, with a Physics Briefing Book (PBB) presented in (2104.06852). [...]
arXiv:2603.06291. - 135.
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2026-03-19
04:01
The photon-energy spectrum in $B\to X_sγ$ to N$^3$LO: light-fermion and large-$N_{\rm c}$ corrections / Fael, Matteo (U. Padua (main) ; INFN, Padua) ; Lange, Fabian (Zurich U. ; PSI, Villigen) ; Schönwald, Kay (CERN) ; Steinhauser, Matthias (KIT, Karlsruhe)
We calculate the photon-energy spectrum of the inclusive radiative decay $B\to X_sγ$, induced by the electromagnetic dipole operator $O_7$, to next-to-next-to-next-to-leading order and consider the complete corrections for light fermions, for the contributions with two closed massive fermion loops, and for the limit of large QCD colour factors $N_{\rm c}$ in the remaining part. [...]
CERN-TH-2026-049 ; P3H-26-018 ; TTP26-007 ; ZU-TH 11/26 ; arXiv:2603.15751. - 38.
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2026-03-19
04:01
$gg \to ZH$ at NLO matched to parton showers with ggxy and POWHEG / Davies, Joshua (U. Liverpool (main)) ; Schönwald, Kay (CERN) ; Steinhauser, Matthias (KIT, Karlsruhe) ; Stremmer, Daniel (KIT, Karlsruhe)
We implement the recently-calculated analytic expressions for the next-to-leading order QCD corrections to $gg\to ZH$ in ggxy. [...]
CERN-TH-2026-051 ; P3H-26-019 ; TTP26-008 ; arXiv:2603.15762. - 23.
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2026-03-18
12:40
A search for lepton-flavour violating $\tau \to 3\mu$ decays with the ATLAS detector
A search for charged lepton flavour violation in $\tau \to 3\mu$ decays is performed in $pp$ collisions at a centre-of-mass energy of 13 TeV using ATLAS data collected between 2016 and 2018, corresponding to an integrated luminosity of 137 $\text{fb}^{-1}$ [...]
CERN-EP-2026-059. - 2026
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2026-03-18
06:17
Laboratory observation of collective beam-plasma instabilities in a relativistic pair jet / Halliday, J W D (U. Oxford (main) ; Rutherford Appleton Laboratory) ; Arrowsmith, C D (U. Oxford (main) ; Unlisted, US) ; Goillot, A M (CERN) ; Bilbao, P J (Unlisted) ; Simon, P (Darmstadt, GSI) ; Stergiou, V (U. Oxford (main) ; CERN) ; Zhang, S (U. Oxford (main)) ; Alexaki, P (CERN ; Athens Natl. Capodistrian U.) ; Bochmann, M (Unlisted, AT) ; Bott, A F A (U. Oxford (main)) et al.
We report on a measurement of collective behavior in a relativistic electron-positron pair plasma produced in the laboratory. [...]
arXiv:2602.16542. - 2026 - 7.
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