Abstract
The production of \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) mesons in proton–proton collisions at \(\sqrt{s}=7\ensuremath {~\mathrm {TeV}}\) is studied with the LHCb detector at the LHC. The differential cross-section for prompt \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) production is measured as a function of the \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) transverse momentum pT and rapidity y in the fiducial region \({\ensuremath{p_{\mathrm{T}}}}\in[0;14]{\ensuremath{~\mathrm{GeV}\mskip-2mu/\mskip-1mu c}}\) and y∈[2.0;4.5]. The differential cross-section and fraction of \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) from b-hadron decays are also measured in the same pT and y ranges. The analysis is based on a data sample corresponding to an integrated luminosity of 5.2 pb−1. The measured cross-sections integrated over the fiducial region are for prompt \({\ensuremath{J\hspace{-1.5pt}/\hspace{-0.45pt}\psi}}\) production and
for \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) from b-hadron decays, where the first uncertainty is statistical and the second systematic. The prompt \({\ensuremath{J\hspace{-1.5pt}/\hspace{-0.45pt}\psi}}\) production cross-section is obtained assuming no \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) polarisation and the third error indicates the acceptance uncertainty due to this assumption.
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References
N. Brambilla et al., Heavy quarkonium: progress, puzzles, and opportunities. Eur. Phys. J. C 71, 1534 (2011). arXiv:1010.5827 [hep-ph]
C.-H. Chang, Hadronic production of \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) associated with a gluon. Nucl. Phys. B 172, 425 (1980)
R. Baier, R. Rückl, Hadronic collisions: a quarkonium factory. Z. Phys. C 19, 251 (1983)
F. Abe et al. (The CDF Collaboration), \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) and ψ(2S) production in \(p \overline{p}\) collisions at \(\sqrt{s} = 1.8\) TeV. Phys. Rev. Lett. 79, 572 (1997)
F. Abe et al. (The CDF Collaboration), Production of \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) mesons from χ c meson decays in \(p\overline{p}\) collisions at \(\sqrt{s}=1.8\) TeV. Phys. Rev. Lett. 79, 578 (1997)
M. Cacciari, M. Greco, \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) production via fragmentation at the Tevatron. Phys. Rev. Lett. 73, 1586 (1994). arXiv:hep-ph/9405241
E. Braaten, M.A. Doncheski, S. Fleming, M.L. Mangano, Fragmentation production of \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) and ψ′ at the Tevatron. Phys. Lett. B 333, 548 (1994). arXiv:hep-ph/9405407
G.T. Bodwin, E. Braaten, G.P. Lepage, Rigorous QCD analysis of inclusive annihilation and production of heavy quarkonium. Phys. Rev. D 51, 1125 (1995) erratum ibid. D 55, 5853 (1997). arXiv:hep-ph/9407339
P.L. Cho, A.K. Leibovich, Color octet quarkonia production. Phys. Rev. D 53, 150 (1996). arXiv:hep-ph/9505329
P.L. Cho, A.K. Leibovich, Color octet quarkonia production II. Phys. Rev. D 53, 6203 (1996). arXiv:hep-ph/9511315
A. Abulencia et al. (The CDF Collaboration), Polarization of \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) and ψ(2S) mesons produced in \(p \overline{p}\) collisions at \(\sqrt{s}= 1.96\) TeV. Phys. Rev. Lett. 99, 132001 (2007). arXiv:0704.0638 [hep-ex]
P. Artoisenet, J.-P. Lansberg, F. Maltoni, Hadroproduction of \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) and ϒ in association with a heavy-quark pair. Phys. Lett. B 653, 60 (2007). arXiv:hep-ph/0703129
S.P. Baranov, Topics in associated \({\ensuremath{J\hspace{-1.5pt}/\hspace{-0.45pt}\psi}}+ c + \overline{c}\) production at modern colliders. Phys. Rev. D 73, 074021 (2006)
J.M. Campbell, F. Maltoni, F. Tramontano, QCD corrections to \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) and ϒ production at hadron colliders. Phys. Rev. Lett. 98, 252002 (2007). arXiv:hep-ph/0703113
P. Artoisenet, QCD corrections to heavy quarkonium production. AIP Conf. Proc. 1038, 55 (2008)
P. Artoisenet, J.M. Campbell, J.-P. Lansberg, F. Maltoni, F. Tramontano, ϒ production at Fermilab Tevatron and LHC energies. Phys. Rev. Lett. 101, 152001 (2008). arXiv:0806.3282 [hep-ph]
V. Khachatryan et al. (The CMS Collaboration), Prompt and non-prompt \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) production in pp collisions at \(\sqrt{s} = 7\) TeV. Eur. Phys. J. C 71, 1575 (2011). arXiv:1011.4193 [hep-ex]
A.A. Alves et al. (The LHCb Collaboration), The LHCb detector at the LHC. JINST 3, S08005 (2008)
T. Sjöstrand, S. Mrenna, P.Z. Skands, Pythia 6.4 physics and manual, version 6.422. J. High Energy Phys. 0605, 026 (2006). arXiv:hep-ph/0603175
I. Belyaev et al., Handling of the generation of primary events in Gauss, the LHCb simulation framework. CERN-LHCb-PROC-2010-056, to appear in the proceedings of NSS 2010, the 2010 Nuclear Science Symposium, October 30-November 6, 2010, Knoxville, USA
D.J. Lange, The EvtGen particle decay simulation package. Nucl. Instrum. Methods A 462, 152 (2001)
S. Agostinelli et al. (The GEANT4 Collaboration), GEANT4: a simulation toolkit, version 9.2. Nucl. Instrum. Methods A 506, 250 (2003)
P. Golonka, Z. Was, PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays, version 2.15. Eur. Phys. J. C 45, 97 (2006). arXiv:hep-ph/0506026
K. Nakamura et al. (The Particle Data Group), Review of particle physics. J. Phys. G 37, 075021 (2010)
J.E. Gaiser, Charmonium spectroscopy from radiative decays of the \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) and ψ′. Ph.D. Thesis, SLAC-R-255 (1982)
T. Skwarnicki, A study of the radiative cascade transitions between the ϒ′ and ϒ resonances. Ph.D. Thesis, DESY-F31-86-02 (1986)
S. van der Meer, Calibration of the effective beam height in the ISR. ISR-PO/68-31 (1968)
M. Ferro-Luzzi, Proposal for an absolute luminosity determination in colliding beam experiments using vertex detection of beam-gas interactions. Nucl. Instrum. Methods A 553, 388 (2005)
R. Aaij et al. (The LHCb Collaboration), Prompt \(K^{0}_{\mathrm{S}}\) production in pp collisions at \(\sqrt{s} = 0.9\) TeV. Phys. Lett. B 693, 69 (2010). arXiv:1008.3105 [hep-ex]
K. Gottfried, J.D. Jackson, On the connection between production mechanism and decay of resonances at high-energies. Nuovo Cimento 33, 309 (1964)
C.S. Lam, W.-K. Tung, A systematic approach to inclusive lepton pair production in hadronic collisions. Phys. Rev. D 18, 2447 (1978)
B. Aubert et al. (The BaBar Collaboration), Study of inclusive production of charmonium in B decay. Phys. Rev. D 67, 032002 (2003). arXiv:hep-ex/0207097
R. Aaij et al. (The LHCb Collaboration), Measurement of \(\sigma(pp\to b\overline{b}X)\) at \(\sqrt{s}=7\) TeV in the forward region. Phys. Lett. B 694, 209 (2010). arXiv:1009.2731 [hep-ex]
P. Abreu et al. (The DELPHI Collaboration), \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) production in the hadronic decays of the Z. Phys. Lett. B 341, 109 (1994)
O. Adriani et al. (The L3 Collaboration), χ c production in hadronic Z decays. Phys. Lett. B 317, 467 (1993)
D. Buskulic et al. (The ALEPH Collaboration), Measurements of mean lifetime and branching fractions of b hadrons decaying to \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\). Phys. Lett. B 295, 396 (1992)
T. Aaltonen et al. (The CDF Collaboration), Measurement of ratios of fragmentation fractions for bottom hadrons in \(p\overline{p}\) collisions at \(\sqrt{s} = 1.96\) TeV. Phys. Rev. D 77, 072003 (2008). arXiv:0801.4375 [hep-ex]
D. Asner et al. (The Heavy Flavour Averaging Group (HFAG)), Averages of b-hadron, c-hadron, and τ-lepton properties. arXiv:1010.1589 [hep-ex]
M. Cacciari, M. Greco, P. Nason, The pT spectrum in heavy-flavour hadroproduction. J. High Energy Phys. 9805, 007 (1998). arXiv:hep-ph/9803400
M. Cacciari, S. Frixione, P. Nason, The pT spectrum in heavy-flavor photoproduction. J. High Energy Phys. 0103, 006 (2001). arXiv:hep-ph/0102134
P. Artoisenet, Quarkonium production at the Tevatron and the LHC. PoS ICHEP 2010, 192 (2010)
M. Butenschön, B.A. Kniehl, Reconciling \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) production at HERA, RHIC, Tevatron, and LHC with NRQCD factorization at next-to-leading order. Phys. Rev. Lett. 106, 022301 (2011). arXiv:1009.5662 [hep-ph]
J.-P. Lansberg, On the mechanisms of heavy-quarkonium hadroproduction. Eur. Phys. J. C 61, 693 (2009). arXiv:0811.4005 [hep-ph]
Y.Q. Ma, K. Wang, K.T. Chao, \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) (ψ′) production at Tevatron and LHC at \(O(\alpha_{s}^{4}v^{4})\) in nonrelativistic QCD. Phys. Rev. Lett. 106, 042002 (2011). arXiv:1009.3655 [hep-ph]
A.D. Frawley, T. Ullrich, R. Vogt, Heavy flavor in heavy-ion collisions at RHIC and RHIC II. Phys. Rep. 462, 125 (2008). arXiv:0806.1013 [nucl-ex]
P. Faccioli et al., Study of ψ′ and χ c decays as feed-down sources of \(J\hspace{-1.5pt}/\hspace{-0.45pt}\psi\) hadroproduction. J. High Energy Phys. 0810, 004 (2008). arXiv:0809.2153 [hep-ph]
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The LHCb Collaboration., Aaij, R., Adeva, B. et al. Measurement of J/Ψ production in pp collisions at \(\sqrt{s}=7\) TeV. Eur. Phys. J. C 71, 1645 (2011). https://doi.org/10.1140/epjc/s10052-011-1645-y
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DOI: https://doi.org/10.1140/epjc/s10052-011-1645-y