Observation of $$\Upsilon(\mathrm{1S})$$ pair production in proton-proton collisions at $$\sqrt{s} = $$ 8 TeV
- Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.
Here, pair production of $$\Upsilon(\mathrm{1S})$$ mesons is observed at the LHC in proton-proton collisions at $$ \sqrt{s} = $$ 8 TeV by the CMS experiment in a data sample corresponding to an integrated luminosity of 20.7 fb$$^{-1}$$. Both $$\Upsilon(\mathrm{1S})$$ candidates are fully reconstructed via their decays to $$\mu^{+}\mu^{- } $$. The fiducial acceptance region is defined by an absolute $$\Upsilon(\mathrm{1S})$$ rapidity smaller than 2.0. The fiducial cross section for the production of $$\Upsilon(\mathrm{1S})$$ pairs, assuming that both mesons decay isotropically, is measured to be 68.8 $$\pm$$ 12.7 (stat) $$\pm$$ 7.4 (syst) $$\pm$$ 2.8 ($$\mathcal{B}$$) pb, where the third uncertainty comes from the uncertainty in the branching fraction of $$\Upsilon(\mathrm{1S})$$ decays to $$\mu^{+}\mu^{-}$$. Assuming instead that the $$\Upsilon(\mathrm{1S})$$ mesons are produced with different polarizations leads to variations in the measured cross section in the range from $$-38\%$$ to $$+36\%$$.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- The CMS Collaboration
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1334982
- Report Number(s):
- FERMILAB-PUB-16-496-CMS; CMS-BPH-14-008; CERN-EP-2016-237; arXiv:1610.07095; 1494067
- Journal Information:
- Journal of High Energy Physics (Online), Vol. 2016, Issue 2; ISSN 1029-8479
- Publisher:
- Springer BerlinCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
p p: scattering
p p: colliding beams
Upsilon(9460): pair production
Upsilon(9460): leptonic decay
muon: pair production
Upsilon(9460): branching ratio
Upsilon(9460): hadroproduction
Upsilon(9460): rapidity
meson: decay
channel cross section: measured
CERN LHC Coll
Upsilon(9460): polarization
acceptance
CMS
experimental results
8000 GeV-cms