Observation of charmonium pairs produced exclusively in $pp$ collisions
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 $3{\rm\ fb}^{-1}$ collected at centre-of-mass energies of 7 and 8 TeV, $J/\psi J/\psi$ and $J/\psi\psi(2S)$ pairs are observe...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Institute of Physics Publishing
2014
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| _version_ | 1797084937482928128 |
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| author | Aaij, R Adeva, B Adinolfi, M Affolder, A Ajaltouni, Z Akar, S Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Cartelle, P Jr, A Amato, S Amerio, S Amhis, Y An, L Anderlini, L Anderson, J Andreassen, R Andreotti, M Andrews, J Appleby, R Gutierrez, O Archilli, F |
| author_facet | Aaij, R Adeva, B Adinolfi, M Affolder, A Ajaltouni, Z Akar, S Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Cartelle, P Jr, A Amato, S Amerio, S Amhis, Y An, L Anderlini, L Anderson, J Andreassen, R Andreotti, M Andrews, J Appleby, R Gutierrez, O Archilli, F |
| author_sort | Aaij, R |
| collection | OXFORD |
| description | 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 $3{\rm\ fb}^{-1}$ 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 $$ \begin{array}{rl} \sigma^{J/\psi J/\psi} and= 58\pm10{(\rm stat)} \pm 6{(\rm syst)} {\rm\ pb} , \\ \sigma^{J/\psi\psi(2S)} and= 63 ^{+27}_{-18}{(\rm stat)}\pm 10{(\rm syst)} {\rm\ pb} , \\ \sigma^{\psi(2S)\psi(2S)} and< 237 {\rm\ pb}, \\ \sigma^{\chi_{c0}\chi_{c0}} and< 69 {\rm\ nb}, \\ \sigma^{\chi_{c1}\chi_{c1}} and< 45 {\rm\ pb}, \\ \sigma^{\chi_{c2}\chi_{c2}} and< 141 {\rm\ pb}, \\ \end{array} $$ where the upper limits are set at the 90% confidence level. The measured $J/\psi J/\psi$ and $J/\psi\psi(2S)$ cross-sections are consistent with theoretical expectations. |
| first_indexed | 2024-03-07T02:02:08Z |
| format | Journal article |
| id | oxford-uuid:9db99399-a739-48a7-b1d3-60b9fcaea69c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:02:08Z |
| publishDate | 2014 |
| publisher | Institute of Physics Publishing |
| record_format | dspace |
| spelling | oxford-uuid:9db99399-a739-48a7-b1d3-60b9fcaea69c2022-03-27T00:45:11ZObservation of charmonium pairs produced exclusively in $pp$ collisionsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:9db99399-a739-48a7-b1d3-60b9fcaea69cEnglishSymplectic Elements at OxfordInstitute of Physics Publishing2014Aaij, RAdeva, BAdinolfi, MAffolder, AAjaltouni, ZAkar, SAlbrecht, JAlessio, FAlexander, MAli, SAlkhazov, GCartelle, PJr, AAmato, SAmerio, SAmhis, YAn, LAnderlini, LAnderson, JAndreassen, RAndreotti, MAndrews, JAppleby, RGutierrez, OArchilli, FA 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 $3{\rm\ fb}^{-1}$ 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 $$ \begin{array}{rl} \sigma^{J/\psi J/\psi} and= 58\pm10{(\rm stat)} \pm 6{(\rm syst)} {\rm\ pb} , \\ \sigma^{J/\psi\psi(2S)} and= 63 ^{+27}_{-18}{(\rm stat)}\pm 10{(\rm syst)} {\rm\ pb} , \\ \sigma^{\psi(2S)\psi(2S)} and< 237 {\rm\ pb}, \\ \sigma^{\chi_{c0}\chi_{c0}} and< 69 {\rm\ nb}, \\ \sigma^{\chi_{c1}\chi_{c1}} and< 45 {\rm\ pb}, \\ \sigma^{\chi_{c2}\chi_{c2}} and< 141 {\rm\ pb}, \\ \end{array} $$ where the upper limits are set at the 90% confidence level. The measured $J/\psi J/\psi$ and $J/\psi\psi(2S)$ cross-sections are consistent with theoretical expectations. |
| spellingShingle | Aaij, R Adeva, B Adinolfi, M Affolder, A Ajaltouni, Z Akar, S Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Cartelle, P Jr, A Amato, S Amerio, S Amhis, Y An, L Anderlini, L Anderson, J Andreassen, R Andreotti, M Andrews, J Appleby, R Gutierrez, O Archilli, F Observation of charmonium pairs produced exclusively in $pp$ collisions |
| title | Observation of charmonium pairs produced exclusively in $pp$ collisions |
| title_full | Observation of charmonium pairs produced exclusively in $pp$ collisions |
| title_fullStr | Observation of charmonium pairs produced exclusively in $pp$ collisions |
| title_full_unstemmed | Observation of charmonium pairs produced exclusively in $pp$ collisions |
| title_short | Observation of charmonium pairs produced exclusively in $pp$ collisions |
| title_sort | observation of charmonium pairs produced exclusively in pp collisions |
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