Steven Bass

1 month ago | ici.org | Peter Brady |Steven Bass

Employer plans and individual retirement accounts (IRAs) are an important source of income for all but the lowest-income retirees. Either directly or through a spouse, more than 70 percent of Americans over age 70 receive income from retirement plans. That share increases rapidly with income, however, to nearly 90 percent for those outside the bottom quartile of the income distribution.

Aug 1, 2024 | ici.org | Steven Bass |Professor Michael Bogdan |Adam AspinallKatie Sands |Daniel Schrass

With more than $25 trillion in assets, IRAs, 401(k)s, and similar retirement accounts are a growing source of financial security for everyday Americans. Balances in these accounts have climbed to or near record highs, helping the average long-term saver build a meaningful nest egg.

Feb 3, 2024 | medrxiv.org | Pawel Moskal |Jakub Baran |Steven Bass |Jaroslaw Choinski

P. M. and G. M. are inventors on a patent related to this work [patent nos.: (Poland) PL 227658, (Europe)EP 3039453, and (United States) US 9,851,456], filed (Poland) 30 August 2013, (Europe) 29 August 2014,and (United States) 29 August 2014; published (Poland) 23 January 2018, (Europe) 29 April 2020, and (United States) 26 December 2017. The authors declare that they have no other competing interests.

Jan 2, 2024 | nature.com | Steven Bass |Deepak Kumar |Wojciech Krzemień |Bożena Jasińska |Aurélien Coussat |Meysam Dadgar | +9 more

Discrete symmetries play an important role in particle physics with violation of CP connected to the matter-antimatter imbalance in the Universe. We report the most precise test of P, T and CP invariance in decays of ortho-positronium, performed with methodology involving polarization of photons from these decays. Positronium, the simplest bound state of an electron and positron, is of recent interest with discrepancies reported between measured hyperfine energy structure and theory at the level of 10−4 signaling a need for better understanding of the positronium system at this level. We test discrete symmetries using photon polarizations determined via Compton scattering in the dedicated J-PET tomograph on an event-by-event basis and without the need to control the spin of the positronium with an external magnetic field, in contrast to previous experiments. Our result is consistent with QED expectations at the level of 0.0007 and one standard deviation. Positronium decay events can be used to test violation of fundamental symmetries. Here, the authors use events in the J-PET to improve existing limits on P, T and CP invariance in positronium decays, thanks to a method that does not require to measure the positronium spin but determining polarization of the annihilation photons instead.

Oct 25, 2023 | ebri.org | Sarah Holden |Steven Bass |Craig Copeland

EBRI Issue Brief Changes in 401(k) Plan Asset Allocation Among Consistent Participants, 2016–2020 SummaryKey Findings:This paper provides an update of a longitudinal analysis of 401(k) plan participants drawn from the EBRI/ICI 401(k) database.