Exotic spectroscopy and quarkonia at LHCb

Liu, Bo

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Preprint
Report number	arXiv:1108.5877
Title	Exotic spectroscopy and quarkonia at LHCb
Author(s)	Liu, Bo (Tsinghua U., Beijing ; Orsay, LAL)
Publication	2011
Collaboration	On behalf of the LHCb collaboration
Imprint	31 Aug 2011
Number of pages	6
Note	Comments: 6 pages, 3 figures, Hadron 2011 invited parallel-session talk 6 pages, 3 figures, Hadron 2011 invited parallel-session talk
Presented at	14th International Conference on Hadron Spectroscopy, München, Bayern, Germany, 13 - 17 Jun 2011
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; LHCb
Abstract	Measurements of the X(3872) mass, $\psi(2S)$ production cross-section and $\chi_{c2}/\chi_{c1}$ production ratio using around 35$\rm pb^{-1}$ of pp collision data at $\sqrt{s}$ = 7 TeV during the 2010 LHC running period with the LHCb detector are presented.
Other source	Inspire
Copyright/License	Preprint: (License: CC-BY-4.0)

$Invariant mass distribution of $J/\psi\pi^+\pi^-$ (black points with statistical error bars) and same-sign $J/\psi\pi^\pm\pi^\pm$ (blue filled histogram) candidates. The red curve is the result of the fit to the mass distribution. The insert shows a zoom of the region around the X(3872) mass.$ $Comparison of the LHCb results for the differential production cross-section of $\psai$ with the predictions for prompt production by a NLO NRQCD model\cite{chiccomp}. LHCb data include also $\psai$ from b: the fraction of $\psai$ from b is expected to be of the order of 10$\%$ at low $p_{\rm T}$ and to increase as function of $p_{\rm T}$ to about 40$\%$\cite{psinum}.$ $The ratio $\frac{\sigma{\chi_{c2}}}{\sigma{\chi_{c1}}}$ in bins of $p^{J/\psi}_{\rm T}$ $\in$ [3; 15]GeV/c. The internal error bars correspond to the statistical error on the $\chi_{c1}$ and $\chi_{c2}$ yields; the external error bars include the contribution from all the systematic uncertainties. The shaded area around the data points (black) shows the maximum effect of the unknown $\chic$ polarizations on the result. The upper limit corresponds to the spin state ($\chi_{c1}$: $m_J$ = 1; $\chi_{c2}$: $m_J$ = 2) and the lower limit corresponds to the spin state ($\chi_{c1}$: $m_J$ = 0; $\chi_{c2}$: $m_J$ = 0). The two other bands correspond to the ChiGen MC generator theoretical prediction \cite{chicmc}(in blue) and NLO NRQCD (in red)\cite{chiccomp}.$ Show more plots

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记录创建於2011-08-31，最後更新在2023-03-14

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