Oliver Baker | Yale University (original) (raw)

Papers by Oliver Baker

experiment was the first dark matter experiment to use a photon beam from a high average power fr... more experiment was the first dark matter experiment to use a photon beam from a high average power freeelectron laser (FEL). LIPSS employed the "Light Shining through a Wall" (LSW) technique. Results from these laboratory dark matter searches established new boundaries for six possible dark matter particles. In addition, the experimental setup can be modified for dark energy particle searches using the "Particles in a Jar" technique. The LIPSS setup will be summarized and a brief description of other DM/DE search possibilities (LIPSS-2) with the FEL facility will be discussed.

Light neutral bosons with couplings to two photons are allowed in several extensions to the widel... more Light neutral bosons with couplings to two photons are allowed in several extensions to the widely accepted Standard Model. We present results from a search for such axion-like particles (ALPs) using a cylindrical Cu resonant cavity in a 7 T axial magnetic field. The present experiment is sensitive (g>10-7/GeV) to couplings between a scalar 10-4 eV ALP and two microwave photons. We will discuss the existing measurements as well as modifications that are planned for detection of pseudoscalar ALPs.

arXiv (Cornell University), Jan 31, 2012

The radiation pressure due to totally reflected (solar) chameleons by thin but dense foils or mem... more The radiation pressure due to totally reflected (solar) chameleons by thin but dense foils or membranes or mirrors is suggested to be utilized to detect (solar) chameleons and unravel their theoretically motivated behavior, i.e., their coupling to matter (β m). The underlying process is distinguished from scattered neutrinos or WIMPs off individual atomic nuclei, which require therefore massive detector targets to compensate for their extremely small interaction cross section with matter. The chameleon reflection is instead a density dependent effect, which distinguishes them theoretically and also experimentally. High sensitive photon radiation pressure or force measuring techniques, which work at the quantum limit, could become the new antennas for chameleons or other particles with similar properties. This may lead to a high detection sensitivity for (solar) chameleons, integrating either over a large focused incident flux, or, measuring eventually chameleons individually. Highly developed opto-mechanical measuring techniques, which already includes gravitational waves antennas, may extend their list of applications to unraveling the nature of dark energy in the Universe, and/or outstreaming of solar chameleons. What looks at first sight as a Gedankenexperiment, might become a real experiment. It is to be remarked that these techniques could be applied to any directed chameleon beam like in a chameleon-through-a-wall experiment for example, in particular when equipped with a Fabry-Pérot resonator.

Electrophotoproduction of Strangeness on Nucleons and Nuclei SENDAI03 - Proceedings of the International Symposium, 2004

AIP Conference Proceedings, 2010

In this note we briefly summarize the main future targets and strategies for axion and general lo... more In this note we briefly summarize the main future targets and strategies for axion and general low energy particle physics identified in the "3rd axion strategy meeting" held during the AXIONS 2010 workshop. This summary follows a wide discussion with contributions from many of the workshop attendees.

/keith baker An overview is presented of the LIPSS experimental search for very light neutral bos... more /keith baker An overview is presented of the LIPSS experimental search for very light neutral bosons using laser light from Jefferson Lab's Free Electron Laser. This facility provides very high power beams of photons over a large optical range, particularly at infrared wavelengths. Data has been collected in several experimental runs during the course of the past three years, most recently in the Fall of 2009.

AIP Conference Proceedings, 2010

Much of the focus of Beyond the Standard Model physics searches is on the TeV scale, making use o... more Much of the focus of Beyond the Standard Model physics searches is on the TeV scale, making use of hadron and lepton colliders. Additionally, however, there is the means to make these searches in different regions of parameter space using sub-electron volt photons from a Free Electron Laser, for example. We report on the experimental results of searches for opticalwavelength photons mixing with hypothetical hidden-sector paraphotons in the mass range between 10-5 and 10-2 electron volts for a mixing parameter greater than 10-7. We also report on the results of a sensitive search for scalar coupling of photons to light neutral bosons in the mass range of approximately 1.0 milli-electron volts and coupling strength greater than 10-6 GeV-1. These were generation-regeneration experiments using the "light shining through a wall" technique in which regenerated photons are searched for downstream of an optical barrier that separates it from an upstream generation region. The present results indicate no evidence for photon-paraphoton mixing or for scalar couplings of bosons to photons for the range of parameters investigated.

Physics Letters B, 2009

We report on the first results of a search for optical-wavelength photons mixing with hypothetica... more We report on the first results of a search for optical-wavelength photons mixing with hypothetical hidden-sector paraphotons in the mass range between 10-5 and 10-2 electron volts for a mixing parameter greater than 10-7. This was a generation-regeneration experiment using the "light shining through a wall" technique in which regenerated photons are searched for downstream of an optical barrier that separates it from an upstream generation region. The new limits presented here are approximately three times more sensitive to this mixing than the best previous measurement. The present results indicate no evidence for photon-paraphoton mixing for the range of parameters investigated.

Symmetry

The mystery associated with a proposed Dark Sector of phenomena that are separate from the standa... more The mystery associated with a proposed Dark Sector of phenomena that are separate from the standard model of particle physics is described. A Dark Sector may possess matter particles, force carriers which mediate their interactions, and new interactions and symmetries that are beyond the standard model of particle physics. Various approaches for Dark Sector searches are described, including those at the energy frontier at the Large Hadron Collider, in astrophysical interactions with both terrestrial experiments and those in space-born platforms. Searches using low energy photons from microwave energies in cryogenic environments to x-ray energies are also described. While there is no noncontroversial evidence for Dark Sector phenomena presently, new searches with more modern equipment and analysis methods are exploring regions of phase space that have not been available before now, indicating ongoing interest and excitement in this research.

/baker keith The LIPSS search for a light neutral scalar boson coupling to optical photons is rep... more /baker keith The LIPSS search for a light neutral scalar boson coupling to optical photons is reported. The search covers a region of parameter space of approximately 1.0 meV and coupling strength greater than 10 −6 GeV −1. The LIPSS results show no evidence for scalar coupling in this region of parameter space.

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2015

Several proposed models of the cold dark matter in the universe include light neutral bosons with... more Several proposed models of the cold dark matter in the universe include light neutral bosons with sub-eV masses. In many cases their detection hinges on their infrequent interactions with Standard Model photons at sub-eV energies. We describe the design and performance of an experiment to search for aberrations from the broadband noise power associated with a 5 K copper resonant cavity in the vicinity of 34 GHz (0.1 meV). The cavity, microwave receiver, and data reduction are described. Several configurations of the experiment are discussed in terms of their impact on the sensitivity of the search for axion-like particles and hidden sector photons.

Aps April Meeting Abstracts, Apr 1, 2006

Physical Review C, 2015

Background: Measurements of forward exclusive meson production at different squared four-momenta ... more Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, Q 2 , and at different four-momentum transfer, t, can be used to probe QCD's transition from meson-nucleon degrees of freedom at long distances to quark-gluon degrees of freedom at short scales. Ratios of separated response functions in π − and π + electroproduction are particularly informative. The ratio for transverse photons may allow this transition to be more easily observed, while the ratio for longitudinal photons provides a crucial verification of the assumed pole dominance, needed for reliable extraction of the pion form factor from electroproduction data.

The sixth conference on the intersections of particle and nuclear physcis, 1997

This report was prepared as an account of work sponsored by an agency of the United States Govern... more This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liabiiity or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disdosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, ncommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thercof.

BARYONS 2002 - Proceedings of the 9th International Conference on the Structure of Baryons, 2003

Journal of Instrumentation, 2008

4.3.4 Long term high voltage test 36 4.3.5 Straw straightness measurement 36 5. The end-cap group... more 4.3.4 Long term high voltage test 36 4.3.5 Straw straightness measurement 36 5. The end-cap group 43 5.1 Overview on the design of an end-cap group 43 5.2 Assembly and integration 43 5.2.1 Mechanical assembly 43 5.2.2 Mounting and testing of the on-detector electronics 46 5.2.3 Mounting and testing of monitoring sensors 49 6. Services 50 6.1 Distribution of active gas 50 6.2 Electronics cooling 51 6.3 Straw cooling 52 6.3.1 Requirements 52 6.3.2 System tests and validation 52 6.3.3 The pump module 53 6.3.4 The gas renewal module 53 6.3.5 The distribution racks 54 6.3.6 Installation on detector and control racks 54 7. Summary of weights and material distribution 55 8. Performance of end-cap modules at beam tests 56

experiment was the first dark matter experiment to use a photon beam from a high average power fr... more experiment was the first dark matter experiment to use a photon beam from a high average power freeelectron laser (FEL). LIPSS employed the "Light Shining through a Wall" (LSW) technique. Results from these laboratory dark matter searches established new boundaries for six possible dark matter particles. In addition, the experimental setup can be modified for dark energy particle searches using the "Particles in a Jar" technique. The LIPSS setup will be summarized and a brief description of other DM/DE search possibilities (LIPSS-2) with the FEL facility will be discussed.

Light neutral bosons with couplings to two photons are allowed in several extensions to the widel... more Light neutral bosons with couplings to two photons are allowed in several extensions to the widely accepted Standard Model. We present results from a search for such axion-like particles (ALPs) using a cylindrical Cu resonant cavity in a 7 T axial magnetic field. The present experiment is sensitive (g>10-7/GeV) to couplings between a scalar 10-4 eV ALP and two microwave photons. We will discuss the existing measurements as well as modifications that are planned for detection of pseudoscalar ALPs.

arXiv (Cornell University), Jan 31, 2012

The radiation pressure due to totally reflected (solar) chameleons by thin but dense foils or mem... more The radiation pressure due to totally reflected (solar) chameleons by thin but dense foils or membranes or mirrors is suggested to be utilized to detect (solar) chameleons and unravel their theoretically motivated behavior, i.e., their coupling to matter (β m). The underlying process is distinguished from scattered neutrinos or WIMPs off individual atomic nuclei, which require therefore massive detector targets to compensate for their extremely small interaction cross section with matter. The chameleon reflection is instead a density dependent effect, which distinguishes them theoretically and also experimentally. High sensitive photon radiation pressure or force measuring techniques, which work at the quantum limit, could become the new antennas for chameleons or other particles with similar properties. This may lead to a high detection sensitivity for (solar) chameleons, integrating either over a large focused incident flux, or, measuring eventually chameleons individually. Highly developed opto-mechanical measuring techniques, which already includes gravitational waves antennas, may extend their list of applications to unraveling the nature of dark energy in the Universe, and/or outstreaming of solar chameleons. What looks at first sight as a Gedankenexperiment, might become a real experiment. It is to be remarked that these techniques could be applied to any directed chameleon beam like in a chameleon-through-a-wall experiment for example, in particular when equipped with a Fabry-Pérot resonator.

Electrophotoproduction of Strangeness on Nucleons and Nuclei SENDAI03 - Proceedings of the International Symposium, 2004

AIP Conference Proceedings, 2010

In this note we briefly summarize the main future targets and strategies for axion and general lo... more In this note we briefly summarize the main future targets and strategies for axion and general low energy particle physics identified in the "3rd axion strategy meeting" held during the AXIONS 2010 workshop. This summary follows a wide discussion with contributions from many of the workshop attendees.

/keith baker An overview is presented of the LIPSS experimental search for very light neutral bos... more /keith baker An overview is presented of the LIPSS experimental search for very light neutral bosons using laser light from Jefferson Lab's Free Electron Laser. This facility provides very high power beams of photons over a large optical range, particularly at infrared wavelengths. Data has been collected in several experimental runs during the course of the past three years, most recently in the Fall of 2009.

AIP Conference Proceedings, 2010

Much of the focus of Beyond the Standard Model physics searches is on the TeV scale, making use o... more Much of the focus of Beyond the Standard Model physics searches is on the TeV scale, making use of hadron and lepton colliders. Additionally, however, there is the means to make these searches in different regions of parameter space using sub-electron volt photons from a Free Electron Laser, for example. We report on the experimental results of searches for opticalwavelength photons mixing with hypothetical hidden-sector paraphotons in the mass range between 10-5 and 10-2 electron volts for a mixing parameter greater than 10-7. We also report on the results of a sensitive search for scalar coupling of photons to light neutral bosons in the mass range of approximately 1.0 milli-electron volts and coupling strength greater than 10-6 GeV-1. These were generation-regeneration experiments using the "light shining through a wall" technique in which regenerated photons are searched for downstream of an optical barrier that separates it from an upstream generation region. The present results indicate no evidence for photon-paraphoton mixing or for scalar couplings of bosons to photons for the range of parameters investigated.

Physics Letters B, 2009

We report on the first results of a search for optical-wavelength photons mixing with hypothetica... more We report on the first results of a search for optical-wavelength photons mixing with hypothetical hidden-sector paraphotons in the mass range between 10-5 and 10-2 electron volts for a mixing parameter greater than 10-7. This was a generation-regeneration experiment using the "light shining through a wall" technique in which regenerated photons are searched for downstream of an optical barrier that separates it from an upstream generation region. The new limits presented here are approximately three times more sensitive to this mixing than the best previous measurement. The present results indicate no evidence for photon-paraphoton mixing for the range of parameters investigated.

Symmetry

The mystery associated with a proposed Dark Sector of phenomena that are separate from the standa... more The mystery associated with a proposed Dark Sector of phenomena that are separate from the standard model of particle physics is described. A Dark Sector may possess matter particles, force carriers which mediate their interactions, and new interactions and symmetries that are beyond the standard model of particle physics. Various approaches for Dark Sector searches are described, including those at the energy frontier at the Large Hadron Collider, in astrophysical interactions with both terrestrial experiments and those in space-born platforms. Searches using low energy photons from microwave energies in cryogenic environments to x-ray energies are also described. While there is no noncontroversial evidence for Dark Sector phenomena presently, new searches with more modern equipment and analysis methods are exploring regions of phase space that have not been available before now, indicating ongoing interest and excitement in this research.

/baker keith The LIPSS search for a light neutral scalar boson coupling to optical photons is rep... more /baker keith The LIPSS search for a light neutral scalar boson coupling to optical photons is reported. The search covers a region of parameter space of approximately 1.0 meV and coupling strength greater than 10 −6 GeV −1. The LIPSS results show no evidence for scalar coupling in this region of parameter space.

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2015

Several proposed models of the cold dark matter in the universe include light neutral bosons with... more Several proposed models of the cold dark matter in the universe include light neutral bosons with sub-eV masses. In many cases their detection hinges on their infrequent interactions with Standard Model photons at sub-eV energies. We describe the design and performance of an experiment to search for aberrations from the broadband noise power associated with a 5 K copper resonant cavity in the vicinity of 34 GHz (0.1 meV). The cavity, microwave receiver, and data reduction are described. Several configurations of the experiment are discussed in terms of their impact on the sensitivity of the search for axion-like particles and hidden sector photons.

Aps April Meeting Abstracts, Apr 1, 2006

Physical Review C, 2015

Background: Measurements of forward exclusive meson production at different squared four-momenta ... more Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, Q 2 , and at different four-momentum transfer, t, can be used to probe QCD's transition from meson-nucleon degrees of freedom at long distances to quark-gluon degrees of freedom at short scales. Ratios of separated response functions in π − and π + electroproduction are particularly informative. The ratio for transverse photons may allow this transition to be more easily observed, while the ratio for longitudinal photons provides a crucial verification of the assumed pole dominance, needed for reliable extraction of the pion form factor from electroproduction data.

The sixth conference on the intersections of particle and nuclear physcis, 1997

This report was prepared as an account of work sponsored by an agency of the United States Govern... more This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liabiiity or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disdosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, ncommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thercof.

BARYONS 2002 - Proceedings of the 9th International Conference on the Structure of Baryons, 2003

Journal of Instrumentation, 2008

4.3.4 Long term high voltage test 36 4.3.5 Straw straightness measurement 36 5. The end-cap group... more 4.3.4 Long term high voltage test 36 4.3.5 Straw straightness measurement 36 5. The end-cap group 43 5.1 Overview on the design of an end-cap group 43 5.2 Assembly and integration 43 5.2.1 Mechanical assembly 43 5.2.2 Mounting and testing of the on-detector electronics 46 5.2.3 Mounting and testing of monitoring sensors 49 6. Services 50 6.1 Distribution of active gas 50 6.2 Electronics cooling 51 6.3 Straw cooling 52 6.3.1 Requirements 52 6.3.2 System tests and validation 52 6.3.3 The pump module 53 6.3.4 The gas renewal module 53 6.3.5 The distribution racks 54 6.3.6 Installation on detector and control racks 54 7. Summary of weights and material distribution 55 8. Performance of end-cap modules at beam tests 56