Papers by Deepak Kumar Sahoo
The second-order Fourier coefficients ($v_2$) characterizing the azimuthal distribution of $\Upsi... more The second-order Fourier coefficients ($v_2$) characterizing the azimuthal distribution of $\Upsilon$(1S) and $\Upsilon$(2S) mesons arising from PbPb collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV are studied. The $\Upsilon$ mesons are reconstructed in their dimuon decay channel, as measured by the CMS detector. The data set was collected in 2018 and corresponds to an integrated luminosity of 1.7 nb$^{-1}$. The scalar product method is used to extract the $v_2$ coefficients of the azimuthal distribution. Results are reported for the rapidity range $|y|\lt$ 2.4, with the transverse momentum 0 $\lt p_\mathrm{T} \lt$ 50 GeV/$c$, and in three centrality ranges of 10-30, 30-50 and 50-90%. In contrast to the J/$\psi$ mesons, no azimuthal anisotropy is observed for the $\Upsilon$ mesons.
A measurement is presented of the effective leptonic weak mixing angle (sin2 θ eff) using the for... more A measurement is presented of the effective leptonic weak mixing angle (sin2 θ eff) using the forward– backward asymmetry of Drell–Yan lepton pairs (μμ and ee) produced in proton–proton collisions at √ s = 8 TeV at the CMS experiment of the LHC. The data correspond to integrated luminosities of 18.8 and 19.6 fb−1 in the dimuon and dielectron channels, respectively, containing 8.2 million dimuon and 4.9 million dielectron events. With more events and new analysis techniques, including constraints obtained on the parton distribution functions from the measured forward–backward asymmetry, the statistical and systematic uncertainties are significantly reduced relative to previous CMS measurements. The extracted value of sin2 θ eff from the combined dilepton data is sin2 θ eff = 0.23101 ± 0.00036 (stat) ± 0.00018 (syst) ± 0.00016 (theo) ± 0.00031 (parton distributions in proton) = 0.23101 ± 0.00053.
Physical Review Letters, 2017
The differential production cross sections of B$^±$ mesons are measured via the exclusive decay c... more The differential production cross sections of B$^±$ mesons are measured via the exclusive decay channels B$^±$ → J/ψ K$^±$ → μ$^+$μ$^-$K$^±$ as a function of transverse momentum in pp and Pb-Pb collisions at a center-of-mass energy $\sqrt{{s}_{NN}}=$ 5.02 TeV per nucleon pair with the CMS detector at the LHC. The pp(Pb-Pb) data set used for this analysis corresponds to an integrated luminosity of 28.0 pb$^{-1}$ (351 μb$^{-1}$). The measurement is performed in the B$^±$ meson transverse momentum range of 7 to 50 GeV/c, in the rapidity interval $|y|
The determination of the differential branching fraction and the first angular analysis of the de... more The determination of the differential branching fraction and the first angular analysis of the decay B 0 s → φµ + µ − are presented using data, corresponding to an integrated luminosity of 1.0 fb −1 , collected by the LHCb experiment at √ s = 7 TeV. The differential branching fraction is determined in bins of q 2 , the invariant dimuon mass squared. Integration over the full q 2 range yields a total branching fraction of B(B 0 s → φµ + µ −) = 7.07 +0.64 −0.59 ± 0.17 ± 0.71 × 10 −7 , where the first uncertainty is statistical, the second systematic, and the third originates from the branching fraction of the normalisation channel. An angular analysis is performed to determine the angular observables F L , S 3 , A 6 , and A 9. The observables are consistent with Standard Model expectations.
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Papers by Deepak Kumar Sahoo