New Physics Opportunities for Long-Lived Particles at Electron-Proton Colliders

Future electron-proton collider proposals like the LHeC or the FCC-eh can supply 1/ab of collisions with a center-of-mass energy in the TeV range, while maintaining a clean experimental environment more commonly associated with lepton colliders. We point out that this makes electron-proton colliders ideally suited to probe BSM signatures with final states that look like "hadronic noise" in the high-energy, pile-up-rich environment of hadron colliders. We focus on the generic vector boson fusion production mechanism, which is available for all BSM particles with electroweak charges at mass scales far above the reach of most lepton colliders. This is in contrast to previous BSM studies at these machines, which focused on BSM processes with large production rates from the asymmetric initial state. We propose to exploit the unique experimental environment in the search for long-lived particle signals arising from Higgsinos or exotic Higgs decays. At electron-proton colliders, the soft decay products of long-lived Higgsinos can be explicitly reconstructed ("displaced single pion"), and very short lifetimes can be probed. We find that electron-proton colliders can explore significant regions of BSM parameter space inaccessible to other collider searches, with important implications for the design of such machines.Comment: 16 pages, 11 figure

Closing the light gluino gap with electron-proton colliders

The future electron-proton collider proposals, LHeC and FCC-he, can deliver $\mathcal{O}$(TeV) center-of-mass energy collisions, higher than most of the proposed lepton accelerators, with $\mathcal{O}$(ab$^{-1}$) luminosity, while maintaining a much cleaner experimental environment as compared to the hadron machines. This unique capability of $e^- p$ colliders can be harnessed in probing BSM scenarios giving final states that look like hadronic noise at $pp$ machines. In the present study, we explore the prospects of detecting such a prompt signal having multiple soft jets at the LHeC. Such a signal can come from the decay of gluino in RPV or Stealth SUSY, where there exists a gap in the current experimental search with $m_{\tilde{g}} \approx 50 - 70$ GeV. We perform a simple analysis to demonstrate that, with simple signal selection cuts, we can close this gap at the LHeC at 95 % confidence level, even in the presence of a reasonable systematic error. More sophisticated signal selection strategies and detailed knowledge of the detector can be used to improve the prospects of signal detection.Comment: 7 pages, 5 figure

The Brother in Law Effect

Ordinarily labor market equilibrium implies that the marginal worker is indifferent to employment, and that the employer is indifferent between equally productive employees. When the marginal worker is indifferent to employment, employer preferences do not matter. If, however, the marginal worker strictly prefers to be employed, the employer can give favors, and may wish to do so even at some cost to efficient production. Not only may inefficient workers be employed, but the employer may also choose to employ too many workers. We refer to this as the brother-in law effect. When the brother-in-law effect is due to unionization, employment of brothers-inlaw leads to increased employment – under some circumstances leading even to over employment relative to the workforce that would be employed without unionization. If the employment effect is strong – because brothers-in-law are relatively good workers – nepotism improves efficiency. If the employment effect is weak – including in principalagent models where there are informational rents – nepotism is inefficient.

Financial Crisis, Health Outcomes and Aging: Mexico in the 1980s and 1990s

We study the impact of economic crisis on health in Mexico. There have been four wide-scale economic crises in Mexico in the past two decades, the most recent in 1995-96. We find that mortality rates for the very young and the elderly increase or decline less rapidly in crisis years as compared with non-crisis years. In late 1995-96 crisis, mortality rates were about 5 to 7 percent higher in the crisis years compared to the years just prior to the crisis. This translates into a 0.4 percent increase in mortality for the elderly and a 0.06 percent increase in mortality for the very young. We find tentative evidence that economic crises affect mortality by reducing incomes and possibly by placing a greater burden on the medical sector, but not by forcing less healthy members of the population to work or by forcing primary caregivers to go to work.

The brother-in-law effect

When a firm is forced to pay abnormally high wages, hiring transfers rents. This effectively endows the employer with the ability to grant favors, and he may wish to do so even at some cost to efficient production. We refer to this as the brother-in-law effect. This article analyzes its consequences. When the brother-in-law effect is due to unionization, decisions regarding both the number and type of workers employed could be inefficient; overemployment could obtain even relative to the workforce that would be employed without unionization. We also identify cases in which nepotism improves efficiency.Fil: Levine, David K.. Washington University in St. Louis; Estados Unidos. Pontificia Universidad Católica de Chile; Chile. Universidad de San Andrés; ArgentinaFil: Weinschelbaum, Federico. Washington University in St. Louis; Estados Unidos. Universidad de San Andrés; Argentina. Pontificia Universidad Católica de Chile; Chile. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Zurita, Felipe. Washington University in St. Louis; Estados Unidos. Pontificia Universidad Católica de Chile; Chile. Universidad Católica de Chile; Chil

Financial Crisis, Health Outcomes, and Aging: Mexico in the 1980s and 1990s

We study the impact of economic crisis on health in Mexico. There have been four wide-scale economic crises in Mexico in the past two decades, the most recent in 1995–96. We find that mortality rates for the very young and the elderly increase or decline less rapidly in crisis years as compared with non-crisis years. In the 1995–96 crisis, mortality rates were about 5 to 7 percent higher in the crisis years compared to the years just prior to the crisis. This translates into a 0.4 percent increase in mortality for the elderly and a 0.06 percent increase in mortality for the very young. We find tentative evidence that economic crises affect mortality by reducing incomes and possibly by placing a greater burden on the medical sector, but not by forcing less healthy members of the population to work or by forcing primary caregivers to go to work.Economic