Observation of charmonium pairs produced exclusively in $pp$ collisions - INSPIRE

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Observation of charmonium pairs produced exclusively in $pp$ collisions

LHCb

Collaboration

Jul 22, 2014

20 pages

Published in:

J.Phys.G 41 (2014) 11, 115002

Published: Sep 19, 2014

e-Print:

1407.5973 [hep-ex]

DOI:

10.1088/0954-3899/41/11/115002

Report number:

CERN-PH-EP-2014-174,
LHCB-PAPER-2014-027

Experiments:

CERN-LHC-LHCb

View in:

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Abstract: (IOP)

A search is performed for the central exclusive production of pairs of charmonia produced in proton-proton collisions. Using data corresponding to an integrated luminosity of

3{\rm f}{{{\rm b}}^{-1}}

collected at centre-of-mass energies of 7 and 8 TeV,

J/\psi J/\psi

and

J/\psi \psi (2S)

pairs are observed, which have been produced in the absence of any other activity inside the LHCb acceptance that is sensitive to charged particles in the pseudorapidity ranges

(-3.5,-1.5)

and

(1.5,5.0)

. Searches are also performed for pairs of P-wave charmonia and limits are set on their production. The cross-sections for these processes, where the dimeson system has a rapidity between 2.0 and 4.5, are measured to be

\begin{array}{rcl} {{\sigma }^{{\rm J}/\psi {\rm J}/\psi }} & = & 58\pm 10({\rm stat})\pm 6({\rm syst})\,{\rm pb}, \\ {{\sigma }^{{\rm J}/\psi \psi (2S)}} & = & 63_{-18}^{+27}({\rm stat})\pm 10({\rm syst})\,{\rm pb}, \\ {{\sigma }^{\psi (2S)\psi (2S)}} & \lt & 237\,{\rm pb}, \\ {{\sigma }^{{{\chi }_{{\rm c}0}}{{\chi }_{{\rm c}0}}}} & \lt & 69\,{\rm nb}, \\ {{\sigma }^{{{\chi }_{{\rm c}1}}{{\chi }_{{\rm c}1}}}} & \lt & 45\,{\rm pb}, \\ {{\sigma }^{{{\chi }_{{\rm c}2}}{{\chi }_{{\rm c}2}}}} & \lt & 141\,{\rm pb}, \\ \end{array}

where the upper limits are set at the 90% confidence level. The measured

{\rm J}/\psi {\rm J}/\psi

and

{\rm J}/\psi \psi (2S)

cross-sections are consistent with theoretical expectations.

Note:

21 pages, 5 figures

QCD
diffraction
charmonia
p p: exclusive reaction
psi(3685)
charmonium: pair production
rapidity dependence
LHC-B
pomeron: exchange
exchange: multiple

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