Engineering topics

Pueschel, Elisa

Publications and source records attributed to Pueschel, Elisa.

5 records

DOE OSTI2023

Snowmass2021 cosmic frontier white paper: Ultraheavy particle dark matter

We outline the unique opportunities and challenges in the search for "ultraheavy" dark matter candidates with masses between roughly 10 TeV and the Planck scale $m_{\rm pl} ≈ 10^{16}$ TeV. This mass range presents a wide and relatively unexplored dark matter parameter space, with a rich space of possible models and cosmic histories. We emphasize that both current detectors and new, targeted search techniques, via both direct and indirect detection, are poised to contribute to searches for ultraheavy particle dark matter in the coming decade. We highlight the need for new developments in this space, including new analyses of current and imminent direct and indirect experiments targeting ultraheavy dark matter and development of new, ultra-sensitive detector technologies like next-generation liquid noble detectors, neutrino experiments, and specialized quantum sensing techniques.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗

DOE OSTI2022

Current and Future γ-Ray Searches for Dark Matter Annihilation Beyond the Unitarity Limit

For decades, searches for electroweak-scale dark matter (DM) have been performed without a definitive detection. This lack of success may hint that DM searches have focused on the wrong mass range. A proposed candidate beyond the canonical parameter space is ultraheavy DM (UHDM). In this work, we consider indirect UHDM annihilation searches for masses between 30 TeV and 30 PeV—extending well beyond the unitarity limit at ~100 TeV—and discuss the basic requirements for DM models in this regime. We explore the feasibility of detecting the annihilation signature, and the expected reach for UHDM with current and future very-high-energy (VHE; >100 GeV) γ-ray observatories. Specifically, we focus on three reference instruments: two Imaging Atmospheric Cherenkov Telescope arrays, modeled on VERITAS and CTA-North, and one extended air shower array, motivated by HAWC. With reasonable assumptions on the instrument response functions and background rate, we find a set of UHDM parameters (mass and cross section) for which a γ-ray signature can be detected by the aforementioned observatories. Here, we further compute the expected upper limits for each experiment. With realistic exposure times, the three instruments can probe DM across a wide mass range. At the lower end, it can still have a point-like cross section, while at higher masses the DM could have a geometric cross section, indicative of compositeness.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗

DOE OSTI2019

Combined Dark Matter searches towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, HESS, MAGIC and VERITAS

The search for Dark Matter (DM) has great potential to reveal physics beyond the Standard Model. As such, searches for evidence of DM particles are being carried out using a wide range of techniques, such as direct searches for DM particles, searches for DM produced with colliders, and indirect searches for the Standard Model annihilation products of DM. Dwarf spheroidal galaxies (dSphs) are excellent targets for indirect Dark Matter searches due to their relatively high DM content and negligible expected astrophysical background. A collaboration was formed to maximise the sensitivity of DM searches towards dSphs by combining for the first time dSph data from three imaging air Cherenkov telescope (IACT) arrays: HESS, MAGIC, and VERITAS; the Fermi-LAT satellite, and the water Cherenkov detector HAWC. Due to the diverse nature of the instruments involved, each experiment will analyse their individual datasets from multiple targets and then the results will be combined at the likelihood level. For consistency of the likelihoods across the five experiments, a common approach is used to treat the astrophysical factor (J-Factor) for each target and an agreed set of annihilation channels are considered. We also agree on a com- mon statistical approach and treatment of instrumental systematic uncertainties. The results are presented in terms of constraints on the velocity-weighted cross section for DM self-annihilation as a function of the DM particle mass.

79 ASTRONOMY AND ASTROPHYSICS↗

DOE OSTI2010

Measurement of the CP Violating Phase $\boldsymbol{\sin(2\beta_{s})}$ using $\boldsymbol{B^{0}_{s}\rightarrow J/\psi\phi}$ Decays at CDF

A B 0 s meson can oscillate into its anti-particle, the $\bar{B}$ 0 s meson, before decaying. CP violation in this system is made possible by the presence of amplitudes from both mixed and unmixed B 0 s meson decays. The CP violating phase βs appears in the interference between the decay amplitudes. The quantity sin(2β s ) is expected to be small in the standard model. Thus, measuring a large value for sin(2βs) would be an unequivocal sign of new physics participation in the B 0 s mixing loop diagram. In this thesis, we present a latest measurement of sin(2β s ), using 5.2 fb -1 of data collected at CDF from p$\bar{p}$ collisions at a center of mass energy of √s=1.96 TeV. A time-dependent angular analysis, with the production flavor of the B 0 s meson identified with flavor tagging methods, is used to extract sin(2β s ) from ~6500 B 0 s → J/ψφ decays. Other parameters of interest, such as the B 0 s lifetime and the decay width difference between the heavy and light B0 s mass eigenstates are determined to high precision. Also, the effect of potential contributions to the final state from B 0 s → J/ψf 0 and B 0 s → J/ψK + K - decays is considered for the first time. We present 68% and 95% confidence regions in the β s plane. The probability that the observed central value is a fluctuation of the data from the standard model expected value of β s is calculated to be 44%. The observed confidence region shows better agreement with the standard model prediction than previous measurements.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗

DOE OSTI2010

B Physics at CDF

The authors present the latest B physics results from the CDF experiment at the Fermilab Tevatron collider. They focus on a number of analyses, including a measurement of the forward-backward asymmetry of B {yields} K{sup (*)}{mu}{mu} decays, determination of the Cp violating phase sin 2{beta}{sub s} in B{sub s}{sup 0} {yields} J/{psi}{phi} decays, B {yields} J/{psi}X lifetime measurements, observation of resonance structure in {Lambda}{sub b} {yields} {Lambda}{sub c}{pi}{sup -}{pi}{sup +}{pi}{sup -}, and {Upsilon}(1S) polarization.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗