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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 217 records · Page 12
All sourcesNASA NTRSDOE OSTI
DOE OSTI2023

Observation of e + e – → ω χ b J ( 1 P ) and Search for X b → ω Υ ( 1 S ) at s near 10.75 GeV

We study the processes $e^{+}e^{–} → ωχ_{bJ}$(1P) (J=0, 1, or 2) using samples at center-of-mass energies $\sqrt{s}$ = 10.701, 10.745, and 10.805 GeV, corresponding to 1.6, 9.8, and 4.7 fb –1 of integrated luminosity, respectively. These data were collected with the Belle II detector during special operations of the SuperKEKB collider above the Υ(4S) resonance. We report the first observation of $ωχ_{bJ}$(1P) signals at $\sqrt{s}$ = 10.745 GeV. By combining Belle II data with Belle results at $\sqrt{s}$ = 10.867 GeV, we find energy dependencies of the Born cross sections for $e^{+}e^{–} → ωχ_{b1,b2}$(1P) to be consistent with the shape of the Υ(10753) state. These data indicate that the internal structures of the Υ(10753) and Υ(10860) states may differ. Including data at $\sqrt{s}$ = 10.653 GeV, we also search for the bottomonium equivalent of the X(3872) state decaying into ωΥ(1S). No significant signal is observed for masses between 10.45 and 10.65 GeV/c 2 .

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2025

Constraints on standard model effective field theory for a Higgs boson produced in association with W or Z bosons in the H → $\textrm{b}\overline{\textrm{b}}$ decay channel in proton-proton collisions at $\sqrt{s}$ = 13 TeV

A standard model effective field theory (SMEFT) analysis with dimension-six operators probing nonresonant new physics effects is performed in the Higgs-strahlung process, where the Higgs boson is produced in association with a W or Z boson, in proton-proton collisions at a center-of-mass energy of 13 TeV. The final states in which the W or Z boson decays leptonically and the Higgs boson decays to a pair of bottom quarks are considered. The analyzed data were collected by the CMS experiment between 2016 and 2018 and correspond to an integrated luminosity of 138 fb −1 . An approach designed to simultaneously optimize the sensitivity to Wilson coefficients of multiple SMEFT operators is employed. Likelihood scans as functions of the Wilson coefficients that carry SMEFT sensitivity in this final state are performed for different expansions in SMEFT. The results are consistent with the predictions of the standard model.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2026

Search for Higgs boson pair production in the $\mathrm{b}\overline{\mathrm{b}}\mathrm{WW}$ decay channel with two leptons in the final state using proton-proton collision data at $\sqrt{s}=13.6$ TeV

A search for Higgs boson pair production is presented, targeting final states where one Higgs boson decays to a bottom quark-antiquark pair and the other Higgs boson decays to two W bosons, both of which decay leptonically, to an electron or a muon, and a neutrino. For the first time, the search is conducted with proton-proton collision data from the LHC at $\sqrt{s}=13.6$ TeV, recorded with the CMS detector in 2022 and 2023 and corresponding to an integrated luminosity of 62 fb −1 . The results are consistent with the standard model predictions. An upper limit of 12.0 times the standard model prediction at 95% confidence level is set on the Higgs boson pair production cross section, with an expected limit of 18.5. The results are also used to constrain the strength of the trilinear self-coupling of the Higgs boson, as well as of the quartic coupling between two Higgs bosons and two vector bosons.

Hadron-Hadron Scattering↗
DOE OSTI2020

Interaction networks for the identification of boosted H → $b\overline b$ decays

We develop an algorithm based on an interaction network to identify high-transverse-momentum Higgs bosons decaying to bottom quark-antiquark pairs and distinguish them from ordinary jets that reflect the configurations of quarks and gluons at short distances. The algorithm's inputs are features of the reconstructed charged particles in a jet and the secondary vertices associated with them. Describing the jet shower as a combination of particle-to-particle and particle-to-vertex interactions, the model is trained to learn a jet representation on which the classification problem is optimized. The algorithm is trained on simulated samples of realistic LHC collisions, released by the CMS Collaboration on the CERN Open Data Portal. The interaction network achieves a drastic improvement in the identification performance with respect to state-of-the-art algorithms.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
NASA NTRS1971

The gamma ray experiment for the Small Astronomy Satellite B (SAS-B)

A magnetic core digitized spark chamber gamma ray telescope has been developed for satellite use. The detector has the following characteristics: effective area = 500 cu/cm, solid angle = 1/4 SR; efficiency (high energy) = 0.29; and time resolution of better than two milliseconds.

Fichtel, C. E.↗
NASA NTRS2021

Mass and density of the transiting hot and rocky super-EarthLHS 1478 b (TOI-1640 b)

One of the main objectives of the Transiting Exoplanet Survey Satellite (TESS) mission is the discovery of small rocky planets around relatively bright nearby stars. Here, we report the discovery and characterization of the transiting super-Earth planet orbiting LHS 1478 (TOI-1640). The star is an inactive red dwarf (J∼9.6mag and spectral type m3 V) with mass and radius estimates of 0.20±0.01 M and 0.25±0.01R, respectively, and an effective temperature of 3381±54K. It was observed by TESS in four sectors. These data revealed a transit-like feature with a period of 1.949 days. We combined the TESS data with three ground-based transit measurements, 57 radial velocity (RV) measurements from CARMENES, and 13 RV measurements from IRD, determining that the signal is produced by a planet with a mass of 2.33+0.20−0.20M and a radius of 1.24+0.05−0.05R. The resulting bulk density of this planet is 6.67 g cm−3, which is consistent with a rocky planet with an Fe- and MgSiO3-dominated composition. Although the planet would be too hot to sustain liquid water on its surface (its equilibrium temperature is about ∼595 K, suggesting a Venus-like atmosphere), spectroscopic metrics based on the capabilities of the forthcomingJames WebbSpace Telescope and the fact that the host star is rather inactive indicate that this is one of the most favorable known rocky exoplanets for atmospheric characterization.

M. G. Soto↗
DOE OSTI2020

Materials Data on B by Materials Project

B is beta Boron structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are fifteen inequivalent B sites. In the first B site, B is bonded in a distorted hexagonal planar geometry to six B atoms. There are a spread of B–B bond distances ranging from 1.75–1.77 Å. In the second B site, B is bonded in a 8-coordinate geometry to eight B atoms. There are a spread of B–B bond distances ranging from 1.76–1.88 Å. In the third B site, B is bonded in a 6-coordinate geometry to six B atoms. There are a spread of B–B bond distances ranging from 1.69–1.86 Å. In the fourth B site, B is bonded in a 6-coordinate geometry to six B atoms. There are a spread of B–B bond distances ranging from 1.70–1.85 Å. In the fifth B site, B is bonded in a 6-coordinate geometry to six B atoms. There is one shorter (1.64 Å) and two longer (1.75 Å) B–B bond length. In the sixth B site, B is bonded in a distorted q6 geometry to nine B atoms. There is three shorter (1.73 Å) and three longer (1.85 Å) B–B bond length. In the seventh B site, B is bonded in a 6-coordinate geometry to six equivalent B atoms. All B–B bond lengths are 1.73 Å. In the eighth B site, B is bonded in a distorted hexagonal planar geometry to six B atoms. There is two shorter (1.78 Å) and one longer (1.82 Å) B–B bond length. In the ninth B site, B is bonded in a 6-coordinate geometry to six B atoms. There is one shorter (1.70 Å) and one longer (1.83 Å) B–B bond length. In the tenth B site, B is bonded in a 6-coordinate geometry to six B atoms. Both B–B bond lengths are 1.78 Å. In the eleventh B site, B is bonded in a 6-coordinate geometry to six B atoms. Both B–B bond lengths are 1.82 Å. In the twelfth B site, B is bonded in a 8-coordinate geometry to eight B atoms. There are a spread of B–B bond distances ranging from 1.76–2.01 Å. In the thirteenth B site, B is bonded in a 6-coordinate geometry to six B atoms. There is one shorter (1.79 Å) and one longer (1.91 Å) B–B bond length. In the fourteenth B site, B is bonded in a 6-coordinate geometry to six B atoms. There is one shorter (1.86 Å) and one longer (1.92 Å) B–B bond length. In the fifteenth B site, B is bonded in a 8-coordinate geometry to eight B atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on B by Materials Project

B crystallizes in the trigonal R-3m space group. The structure is three-dimensional and consists of three boron molecules and one B framework. In the B framework, there are fourteen inequivalent B sites. In the first B site, B is bonded in a 6-coordinate geometry to six B atoms. There are a spread of B–B bond distances ranging from 1.69–1.83 Å. In the second B site, B is bonded in a 6-coordinate geometry to six B atoms. There are a spread of B–B bond distances ranging from 1.63–1.82 Å. In the third B site, B is bonded in a 8-coordinate geometry to eight B atoms. There are a spread of B–B bond distances ranging from 1.75–1.96 Å. In the fourth B site, B is bonded in a 6-coordinate geometry to six B atoms. There is one shorter (1.71 Å) and two longer (1.78 Å) B–B bond length. In the fifth B site, B is bonded in a 6-coordinate geometry to six B atoms. There are a spread of B–B bond distances ranging from 1.72–1.76 Å. In the sixth B site, B is bonded in a 5-coordinate geometry to five B atoms. There is one shorter (1.70 Å) and one longer (1.96 Å) B–B bond length. In the seventh B site, B is bonded in a 6-coordinate geometry to six B atoms. All B–B bond lengths are 1.84 Å. In the eighth B site, B is bonded in a 8-coordinate geometry to eight B atoms. Both B–B bond lengths are 1.87 Å. In the ninth B site, B is bonded in a 6-coordinate geometry to six B atoms. There is three shorter (1.83 Å) and two longer (1.94 Å) B–B bond length. In the tenth B site, B is bonded in a 6-coordinate geometry to six B atoms. There are a spread of B–B bond distances ranging from 1.75–1.90 Å. In the eleventh B site, B is bonded in a 7-coordinate geometry to seven B atoms. There are a spread of B–B bond distances ranging from 1.83–2.01 Å. In the twelfth B site, B is bonded in a 8-coordinate geometry to eight B atoms. There are a spread of B–B bond distances ranging from 1.72–1.79 Å. In the thirteenth B site, B is bonded in a 8-coordinate geometry to eight B atoms. In the fourteenth B site, B is bonded in a 6-coordinate geometry to six B atoms. Both B–B bond lengths are 1.78 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on B by Materials Project

B crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are fourteen inequivalent B sites. In the first B site, B is bonded in a 5-coordinate geometry to five B atoms. There are a spread of B–B bond distances ranging from 1.65–1.86 Å. In the second B site, B is bonded in a 7-coordinate geometry to seven B atoms. There are a spread of B–B bond distances ranging from 1.73–2.14 Å. In the third B site, B is bonded in a 5-coordinate geometry to five B atoms. There is two shorter (1.68 Å) and two longer (1.96 Å) B–B bond length. In the fourth B site, B is bonded in a 6-coordinate geometry to five B atoms. There are a spread of B–B bond distances ranging from 1.72–1.95 Å. In the fifth B site, B is bonded in a 7-coordinate geometry to seven B atoms. There are a spread of B–B bond distances ranging from 1.70–1.89 Å. In the sixth B site, B is bonded in a 6-coordinate geometry to six B atoms. There is one shorter (1.80 Å) and two longer (1.87 Å) B–B bond length. In the seventh B site, B is bonded in a 6-coordinate geometry to six B atoms. There are a spread of B–B bond distances ranging from 1.75–2.03 Å. In the eighth B site, B is bonded in a 7-coordinate geometry to seven B atoms. The B–B bond length is 1.73 Å. In the ninth B site, B is bonded in a 6-coordinate geometry to six B atoms. There is two shorter (1.70 Å) and one longer (1.77 Å) B–B bond length. In the tenth B site, B is bonded in a distorted hexagonal planar geometry to six B atoms. Both B–B bond lengths are 1.80 Å. In the eleventh B site, B is bonded in a 5-coordinate geometry to five B atoms. There are a spread of B–B bond distances ranging from 1.65–1.73 Å. In the twelfth B site, B is bonded in a 7-coordinate geometry to seven B atoms. The B–B bond length is 2.04 Å. In the thirteenth B site, B is bonded in a 8-coordinate geometry to eight B atoms. In the fourteenth B site, B is bonded in a 7-coordinate geometry to seven B atoms. Both B–B bond lengths are 1.75 Å.

36 MATERIALS SCIENCE↗