Observation of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>Ω</mml:mi><mml:mi>b</mml:mi><mml:mo>−</mml:mo></mml:msubsup></mml:math>baryon and measurement of the properties of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>Ξ</mml:mi><mml:mi>b</mml:mi><mml:mo>−</mml:mo></mml:msubsup></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>Ω</mml:mi><mml:mi>b</mml:mi><mml:mo>−</mml:mo></mml:msubsup></mml:math>baryons
Bibliographic record
Abstract
We report the observation of the bottom, doubly-strange baryon ${\ensuremath{\Omega}}_{b}^{\ensuremath{-}}$ through the decay chain ${\ensuremath{\Omega}}_{b}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\Omega}}^{\ensuremath{-}}$, where $J/\ensuremath{\psi}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$, ${\ensuremath{\Omega}}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\Lambda}{K}^{\ensuremath{-}}$, and $\ensuremath{\Lambda}\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{\ensuremath{-}}$, using $4.2\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data from $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$, and recorded with the Collider Detector at Fermilab. A signal is observed whose probability of arising from a background fluctuation is $4.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$, or 5.5 Gaussian standard deviations. The ${\ensuremath{\Omega}}_{b}^{\ensuremath{-}}$ mass is measured to be $6054.4\ifmmode\pm\else\textpm\fi{}6.8(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.9(\mathrm{syst})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$. The lifetime of the ${\ensuremath{\Omega}}_{b}^{\ensuremath{-}}$ baryon is measured to be ${1.13}_{\ensuremath{-}0.40}^{+0.53}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.02(\mathrm{syst})\text{ }\text{ }\mathrm{ps}$. In addition, for the ${\ensuremath{\Xi}}_{b}^{\ensuremath{-}}$ baryon we measure a mass of $5790.9\ifmmode\pm\else\textpm\fi{}2.6(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.8(\mathrm{syst})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ and a lifetime of ${1.56}_{\ensuremath{-}0.25}^{+0.27}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.02(\mathrm{syst})\text{ }\text{ }\mathrm{ps}$. Under the assumption that the ${\ensuremath{\Xi}}_{b}^{\ensuremath{-}}$ and ${\ensuremath{\Omega}}_{b}^{\ensuremath{-}}$ are produced with similar kinematic distributions to the ${\ensuremath{\Lambda}}_{b}^{0}$ baryon, we find $\frac{\ensuremath{\sigma}({\ensuremath{\Xi}}_{b}^{\ensuremath{-}})\mathcal{B}({\ensuremath{\Xi}}_{b}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\Xi}}^{\ensuremath{-}})}{\ensuremath{\sigma}({\ensuremath{\Lambda}}_{b}^{0})\mathcal{B}({\ensuremath{\Lambda}}_{b}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\Lambda})}={0.167}_{\ensuremath{-}0.025}^{+0.037}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.012(\mathrm{syst})$ and $\frac{\ensuremath{\sigma}({\ensuremath{\Omega}}_{b}^{\ensuremath{-}})\mathcal{B}({\ensuremath{\Omega}}_{b}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\Omega}}^{\ensuremath{-}})}{\ensuremath{\sigma}({\ensuremath{\Lambda}}_{b}^{0})\mathcal{B}({\ensuremath{\Lambda}}_{b}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\Lambda})}={0.045}_{\ensuremath{-}0.012}^{+0.017}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}\phantom{\rule{0ex}{0ex}}0.004(\mathrm{syst})$ for baryons produced with transverse momentum in the range of $6--20\text{ }\text{ }\mathrm{GeV}/c$.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.003 |
| Meta-epidemiology (narrow) | 0.002 | 0.003 |
| Meta-epidemiology (broad) | 0.001 | 0.003 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.003 | 0.005 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.003 | 0.002 |
| Research integrity | 0.002 | 0.003 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".