Measurement of ϒ production in pp collisions at √s = 2.76 TeV

The production of ϒ(1S), ϒ(2S) and ϒ(3S) mesons decaying into the dimuon final state is studied with the LHCb detector using a data sample corresponding to an integrated luminosity of 3.3 pb−1 collected in proton–proton collisions at a centre-of-mass energy of √s = 2.76 TeV. The differential production cross-sections times dimuon branching fractions are measured as functions of the ϒ transverse momentum and rapidity, over the ranges pT < 15 GeV/c and 2.0 < y < 4.5. The total cross-sections in this kinematic region, assuming unpolarised production, are measured to be σ (pp → ϒ(1S)X) × B ϒ(1S)→μ+μ− = 1.111 ± 0.043 ± 0.044 nb, σ (pp → ϒ(2S)X) × B ϒ(2S)→μ+μ− = 0.264 ± 0.023 ± 0.011 nb, σ (pp → ϒ(3S)X) × B ϒ(3S)→μ+μ− = 0.159 ± 0.020 ± 0.007 nb, where the first uncertainty is statistical and the second systematic

An Isolated Stellar-Mass Black Hole Detected Through Astrometric Microlensing

We report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (BH). We used the Hubble Space Telescope (HST) to carry out precise astrometry of the source star of the long-duration (t_E ~ 270 days), high-magnification microlensing event MOA-2011-BLG-191/OGLE-2011-BLG-0462, in the direction of the Galactic bulge. HST imaging, conducted at eight epochs over an interval of six years, reveals a clear relativistic astrometric deflection of the background star's apparent position. Ground-based photometry shows a parallactic signature of the effect of the Earth's motion on the microlensing light curve. Combining the HST astrometry with the ground-based light curve and the derived parallax, we obtain a lens mass of 7.1 +/- 1.3 M_Sun and a distance of 1.58 +/- 0.18 kpc. We show that the lens emits no detectable light, which, along with having a mass higher than is possible for a white dwarf or neutron star, confirms its BH nature. Our analysis also provides an absolute proper motion for the BH. The proper motion is offset from the mean motion of Galactic-disk stars at similar distances by an amount corresponding to a transverse space velocity of ~45 km/s, suggesting that the BH received a modest natal 'kick' from its supernova explosion. Previous mass determinations for stellar-mass BHs have come from radial-velocity measurements of Galactic X-ray binaries, and from gravitational radiation emitted by merging BHs in binary systems in external galaxies. Our mass measurement is the first ever for an isolated stellar-mass BH using any technique

astropy/astroquery: v0.4.5

What's Changed Update Spectra URLs by @weaverba137 in https://github.com/astropy/astroquery/pull/2214ALMA integration tests fix by @andamian in https://github.com/astropy/astroquery/pull/2224Fix doc build issues by @bsipocz in https://github.com/astropy/astroquery/pull/2226Allow retrieval from a previous ESO archive request by @gbrammer in https://github.com/astropy/astroquery/pull/1614Turn off default verbosity for TapPlus by @bsipocz in https://github.com/astropy/astroquery/pull/2228Refreshing content of RTD config by @bsipocz in https://github.com/astropy/astroquery/pull/2229NED: String has to remain raw by @bsipocz in https://github.com/astropy/astroquery/pull/2230eJWST prelaunch by @jespinosaar in https://github.com/astropy/astroquery/pull/2140MNT: Cleanup of old unused code and configs by @bsipocz in https://github.com/astropy/astroquery/pull/2231Adding changelog rendering to narrative docs by @bsipocz in https://github.com/astropy/astroquery/pull/2233Mast cloudaccess docs update by @jaymedina in https://github.com/astropy/astroquery/pull/2235eJWST release by @jespinosaar in https://github.com/astropy/astroquery/pull/2238eJWST: remove disclaimer for release by @jespinosaar in https://github.com/astropy/astroquery/pull/2243Fix to allow html downloads with alma package by @andamian in https://github.com/astropy/astroquery/pull/2246Deprecate astroquery/utils/download_file_list.py by @eerovaher in https://github.com/astropy/astroquery/pull/2247Expand contribution guidelines by @keflavich in https://github.com/astropy/astroquery/pull/2248Fix for issue #2237: do not cache results that cannot be parsed. by @mkelley in https://github.com/astropy/astroquery/pull/2253Adding python 3.10 to CI by @bsipocz in https://github.com/astropy/astroquery/pull/2186 New Contributors @gbrammer made their first contribution in https://github.com/astropy/astroquery/pull/1614 Full Changelog: https://github.com/astropy/astroquery/compare/v0.4.4...v0.4.