CERN — The European Laboratory for Particle Physics

citation:

@online{bbangles,

    author = "Christian Els{\"a}sser",

    collaboration = "LHCb collaboration",

    title = "$\overline{b}b$ production angle plots",

   url = "{\href{https://lhcb.web.cern.ch/lhcb/speakersbureau/html/bb\_ProductionAngles.html}{https://lhcb.web.cern.ch/lhcb/speakersbureau/html/bb\_ProductionAngles.html}}",  urldate = "{your date}"}


√s = 7 TeV

    Produced inside LHCb acceptance(*): 27 % of b or b quarks; 25 % of bb quark pairs.
    Produced inside GPD acceptance(*): 53 % of b or b quarks; 45 % of bb quark pairs.

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√s = 8 TeV

    Produced inside LHCb acceptance(*): 27 % of b or b quarks; 25 % of bb quark pairs.
    Produced inside GPD acceptance(*): 52 % of b or b quarks; 44 % of bb quark pairs.

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√s = 14 TeV

    Produced inside LHCb acceptance(*): 27 % of b or b quarks; 24 % of bb quark pairs.
    Produced inside GPD acceptance(*): 49 % of b or b quarks; 41 % of bb quark pairs.

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(*) The detector acceptances are defined here as

  • 1.8 < η < 4.9 for LHCb and |η| < 2.4 for the GPD
The distributions shown in these plots were created using PYTHIA8 and CTEQ6 NLO, including the following processes weighted according to their cross-sections:
  • qq → bb;    gg → bb;    qq → bbg (where q ≠ b);    bb → bbg;    gg → bbg
All five flavors (u,d,s,c,b) are considered in the PDFs. The total combined cross-sections given by PYTHIA are:
  • 251.8 μb at 7 TeV;    291.6 μb at 8 TeV;    527.3 μb at 14 TeV.
For questions or comments, please contact Christian Elsasser at che@physik.uzh.ch.