The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic
  Survey DR14 quasar sample: anisotropic clustering analysis in
  configuration-space
  We explore the cosmological implications of anisotropic clustering
measurements of the quasar sample from Data Release 14 of the Sloan Digital Sky
Survey IV Extended Baryon Oscillation Spectroscopic Survey (eBOSS) in
configuration space. The $\sim 147,000$ quasar sample observed by eBOSS offers
a direct tracer of the density field and bridges the gap of previous BAO
measurements between redshift $0.8<z<2.2$. By analysing the two-point
correlation function characterized by clustering wedges $\xi_{\rm w_i}(s)$ and
multipoles $\xi_{\ell}(s)$, we measure the angular diameter distance, Hubble
parameter and cosmic structure growth rate. We define a systematic error budget
for our measurements based on the analysis of $N$-body simulations and mock
catalogues. Based on the DR14 large scale structure quasar sample at the
effective redshift $z_{\rm eff}=1.52$, we find the growth rate of cosmic
structure $f\sigma_8(z_{\rm eff})=0.396\pm 0.079$, and the geometric parameters
$D_{\rm V}(z)/r_{\rm d}=26.47\pm 1.23$, and $F_{\rm AP}(z)=2.53\pm 0.22$, where
the uncertainties include both statistical and systematic errors. These values
are in excellent agreement with the best-fitting standard ${\rm \Lambda CDM}$
model to the latest cosmic microwave background data from Planck.
