8th Forward Physics Facility Meeting

Session

Parallel 1

21 Jan 2025, 15:00

6/2-024 - BE Auditorium Meyrin (CERN)

Conveners

Parallel 1: New Physics Searches

• Tomohiro Inada (Kyushu University, RCAPP)

Description

Chair: Tomohiro Inada

4. Cosmic Millicharge Background: Probing Reheating Cosmology, String Theory, and GUTs in FORMOSA & FPF

Yu-Dai Tsai (University of California, Irvine)

21/01/2025, 15:00

We demonstrate that the searches for dark sector particles can provide probes of reheating scenarios, focusing on the cosmic millicharge background produced in the early universe. We discuss two types of millicharge particles (mCPs): either with, or without, an accompanying dark photon. These two types of mCPs have distinct theoretical motivations and cosmological signatures. We discuss...

35. Dark photon pair production via off-shell dark Higgs at FASER

Yohei Nakashima

21/01/2025, 15:20

We consider a dark photon model in which the dark U(1) gauge symmetry is spontaneously broken by a vacuum expectation value of a new scalar boson. We focus on the ForwArd Search ExpeRiment (FASER) and calculate its sensitivity to the dark photon produced from the off-shell decay of the new scalar boson. It is found that the off-shell production extends the sensitivity region beyond the...

32. Dark Vector Splitting Functions in Proton Bremsstrahlung

Saeid Foroughi-Abari

21/01/2025, 15:40

Experiments at the Forward Physics Facility are sensitive to new weakly coupled degrees of freedom across a broad mass range. Among the various production modes in proton-proton collisions, bremsstrahlung is particularly important for dark sector degrees of freedom with masses between 0.5 and 2.0 GeV, due to mixing with hadronic resonances. In this talk, I will revisit the calculation of dark...

7. Discovering Light Scalars Beyond Minimal Flavor Violation

Noam Burger

21/01/2025, 16:00

We study a simple class of flavored scalar models, in which the couplings of a new light scalar to standard-model fermions are controlled by the flavor symmetry responsible for fermion masses and mixings. The scalar couplings are then aligned with the Yukawa matrices, with small but nonzero flavor-violating entries. D-meson decays are an important source of scalar production in these models,...

33. FASER-2 simulation and detector design performance document

Josh McFayden (University of Sussex), Olivier Salin (Université Paris-Saclay)

21/01/2025, 16:50

This talk will aim to present and discuss the in-progress FASER-2 simulation and detector design performance document, which outlines the physics goals, detector requirements, simulation studies, and conceptual design scenarios for the proposed detector. The simulation framework developed uses Geant4 to describe detector geometry for sensitivity studies, along with the ACTS toolkit for track...

34. DELIGHT and FOREHUNT: dedicated detectors at FCC-hh for light long-lived particles

Rhitaja Sengupta (BCTP and Physikalisches Institut der Universität Bonn, Germany)

21/01/2025, 17:10

Our efforts in searching for hints of new physics require close attention to the signatures of light particles arising in theories beyond the Standard Model (BSM) physics, as they could have eluded our searches. In many theories, these light BSM particles can have long lifetimes and are worth exploring. We focus on light long-lived particles (LLPs) coming from the decay of the discovered Higgs...

38. Unlocking the Inelastic Dark Matter Window with Vector Mediators

Peter Reimitz

21/01/2025, 17:30

Despite the robust cosmological and astrophysical evidence confirming the existence of a non-baryonic matter component in the Universe, the underlying nature of Dark Matter (DM) remains a mystery. Among the several possible scenarios, light DM candidates thermally produced in the early Universe are especially interesting, since their abundance could be set via the standard freeze-out...

37. Exploring the LHC as a TeV Muon Beam Dump: Muonphilic Scalars at FASER

Roshan Mammen Abraham (University of California Irvine (US))

21/01/2025, 17:50

At FASER, neutrinos are predominantly produced from meson decays, which also result in an intense energetic flux of muons in the forward direction, which are regularly observed by FASER. So far, these muons are treated only as backgrounds to neutrino and new physics studies, and extensive effort is required to suppress them. Here, we consider the opposite scenario and use muons produced in the...