Weak decays of heavy-quark baryons

Weak decays of heavy-quark baryons offer an attractive laboratory to search for effects beyond the Standard Model (SM), complementary to searches in meson decays. However, the properties of these baryons are not well understood. In particular, the $\Omega^-_b$ baryon is the least studied weakly decaying $b$ baryon. Therefore, the most precise determination of the $\Omega^{-}_{b}$ baryon mass is reported, using $\Omega^-_b \to J/\psi \Omega^-$ decays at the LHCb experiment. In addition, the relative production rate of the $\Omega^-_b$ baryon in $pp$ collisions at the LHC is determined for the first time. These quantities are crucial to predict and measure branching fractions of $\Omega^{-}_{b}$ baryon decays.Comment: Contribution to the 2023 Electroweak session of the 57th Rencontres de Morion

The FLUXNET2015 dataset and the ONEFlux processing pipeline for eddy covariance data

The FLUXNET2015 dataset provides ecosystem-scale data on CO2, water, and energy exchange between the biosphere and the atmosphere, and other meteorological and biological measurements, from 212 sites around the globe (over 1500 site-years, up to and including year 2014). These sites, independently managed and operated, voluntarily contributed their data to create global datasets. Data were quality controlled and processed using uniform methods, to improve consistency and intercomparability across sites. The dataset is already being used in a number of applications, including ecophysiology studies, remote sensing studies, and development of ecosystem and Earth system models. FLUXNET2015 includes derived-data products, such as gap-filled time series, ecosystem respiration and photosynthetic uptake estimates, estimation of uncertainties, and metadata about the measurements, presented for the first time in this paper. In addition, 206 of these sites are for the first time distributed under a Creative Commons (CC-BY 4.0) license. This paper details this enhanced dataset and the processing methods, now made available as open-source codes, making the dataset more accessible, transparent, and reproducible.Peer reviewe

Weak decays of heavy-quark baryons

International audienceWeak decays of heavy-quark baryons offer an attractive laboratory to search for effects beyond the Standard Model (SM), complementary to searches in meson decays. However, the properties of these baryons are not well understood. In particular, the $\Omega^-_b$ baryon is the least studied weakly decaying $b$ baryon. Therefore, the most precise determination of the $\Omega^{-}_{b}$ baryon mass is reported, using $\Omega^-_b \to J/\psi \Omega^-$ decays at the LHCb experiment. In addition, the relative production rate of the $\Omega^-_b$ baryon in $pp$ collisions at the LHC is determined for the first time. These quantities are crucial to predict and measure branching fractions of $\Omega^{-}_{b}$ baryon decays

Weak decays of heavy-quark baryons

Weak decays of heavy-quark baryons offer an attractive laboratory to search for effects beyond the Standard Model (SM), complementary to searches in meson decays. However, the properties of these baryons are not well understood. In particular, the $\Omega^-_b$ baryon is the least studied weakly decaying $b$ baryon. Therefore, the most precise determination of the $\Omega^{-}_{b}$ baryon mass is reported, using $\Omega^-_b \to J/\psi \Omega^-$ decays at the LHCb experiment. In addition, the relative production rate of the $\Omega^-_b$ baryon in $pp$ collisions at the LHC is determined for the first time. These quantities are crucial to predict and measure branching fractions of $\Omega^{-}_{b}$ baryon decays

The Pixel Luminosity Telescope: a detector for luminosity measurement at CMS using silicon pixel sensors

International audienceThe Pixel Luminosity Telescope is a silicon pixel detector dedicated to luminosity measurement at the CMS experiment at the LHC. It is located approximately 1.75 m from the interaction point and arranged into 16 “telescopes”, with eight telescopes installed around the beam pipe at either end of the detector and each telescope composed of three individual silicon sensor planes. The per-bunch instantaneous luminosity is measured by counting events where all three planes in the telescope register a hit, using a special readout at the full LHC bunch-crossing rate of 40 MHz. The full pixel information is read out at a lower rate and can be used to determine calibrations, corrections, and systematic uncertainties for the online and offline measurements. This paper details the commissioning, operational history, and performance of the detector during Run 2 (2015–18) of the LHC, as well as preparations for Run 3, which will begin in 2022

Reprints and permissions:

sagepub.co.uk/journalsPermissions.na