University of Rajasthan

About: University of Rajasthan is a education organization based out in Jaipur, India. It is known for research contribution in the topics: Chemical shift & Derivative (chemistry). The organization has 15058 authors who have published 15733 publications receiving 117400 citations. The organization is also known as: Rajasthan University.

Inclusive quarkonium production at forward rapidity in pp collisions at root s=8 TeV

Abstract: We report on the inclusive production cross sections of J/$\psi$, $\psi$(2S), $\Upsilon$(1S), $\Upsilon$(2S) and $\Upsilon$(3S), measured at forward rapidity with the ALICE detector in pp collisions at a center-of-mass energy $\sqrt{s}=8$ TeV. The analysis is based on data collected at the LHC and corresponds to an integrated luminosity of 1.28 pb$^{-1}$. Quarkonia are reconstructed in the dimuon-decay channel. The differential production cross sections are measured as a function of the transverse momentum $p_{\rm T}$ and rapidity $y$, over the $p_{\rm T}$ ranges $0

Measurement of deuteron spectra and elliptic flow in Pb-Pb collisions at √sNN = 2.76 TeV at the LHC

Abstract: The transverse momentum ( $$p_\mathrm{T} $$ ) spectra and elliptic flow coefficient ( $$v_{2}$$ ) of deuterons and anti-deuterons at mid-rapidity ( $$|y|<0.5$$ ) are measured with the ALICE detector at the LHC in Pb–Pb collisions at $$\sqrt{s_{\mathrm {NN}}}$$ = 2.76 TeV. The measurement of the $$p_\mathrm{T} $$ spectra of (anti-)deuterons is done up to 8 GeV $$/c$$ in 0–10% centrality class and up to 6 GeV $$/c$$ in 10–20% and 20–40% centrality classes. The $$v_{2}$$ is measured in the 0.8 < $$p_\mathrm{T} $$ $$<~$$ 5 GeV $$/c$$ interval and in six different centrality intervals (0–5, 5–10, 10–20, 20–30, 30–40 and 40–50%) using the scalar product technique. Measured $$\pi $$ $$^{\pm }$$ , K $$^{\pm }$$ and p+ $$\overline{\mathrm {p}}$$ transverse-momentum spectra and $$v_{2}$$ are used to predict the deuteron $$p_\mathrm{T} $$ spectra and $$v_{2}$$ within the Blast-Wave model. The predictions are able to reproduce the $$v_{2}$$ coefficient in the measured $$p_\mathrm{T} $$ range and the transverse-momentum spectra for $$p_\mathrm{T} $$ > 1.8 GeV $$/c$$ within the experimental uncertainties. The measurement of the coalescence parameter $$B_2$$ is performed, showing a $$p_\mathrm{T} $$ dependence in contrast with the simplest coalescence model, which fails to reproduce also the measured $$v_{2}$$ coefficient. In addition, the coalescence parameter $$B_2$$ and the elliptic flow coefficient in the 20–40% centrality interval are compared with the AMPT model which is able, in its version without string melting, to reproduce the measured $$v_{2}$$ ( $$p_\mathrm{T} $$ ) and the $$B_2$$ ( $$p_\mathrm{T} $$ ) trend.

Observation of Two-Source Interference in the Photoproduction Reaction AuAu -> AuAu rho(0)

Abstract: In ultraperipheral relativistic heavy-ion collisions, a photon from the electromagnetic field of one nucleus can fluctuate to a quark-antiquark pair and scatter from the other nucleus, emerging as a ρ0. The ρ0 production occurs in two well-separated (median impact parameters of 20 and 40 F for the cases considered here) nuclei, so the system forms a two-source interferometer. At low transverse momenta, the two amplitudes interfere destructively, suppressing ρ0 production. Since the ρ0 decays before the production amplitudes from the two sources can overlap, the two-pion system can only be described with an entangled nonlocal wave function, and is thus an example of the Einstein-Podolsky-Rosen paradox. We observe this suppression in 200 GeV per nucleon-pair gold-gold collisions. The interference is 87%±5%(stat.)±8%(syst.) of the expected level. This translates into a limit on decoherence due to wave function collapse or other factors of 23% at the 90% confidence level.