arXiv subjects

N. Beliy

Publications and source records attributed to N. Beliy.

130 records · Page 8Linked to original sources

arXiv2017

Search for baryon-number-violating $Ξ_b^0$ oscillations

A search for baryon-number-violating $Ξ_b^0$ oscillations is performed with a sample of $pp$ collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 3 fb$^{-1}$. The baryon number at the moment of production is identified by requiring that the $Ξ_b^0$ come from the decay of a resonance $Ξ_b^{*-} \to Ξ_b^0 π^-$ or $Ξ_b^{\prime-} \to Ξ_b^0 π^-$, and the baryon number at the moment of decay is identified from the final state using the decays $Ξ_b^0 \to Ξ_c^+ π^-, ~ Ξ_c^+ \to p K^- π^+$. No evidence of baryon number violation is found, and an upper limit at the 95% confidence level is set on the oscillation rate of $ω< 0.08$ ps$^{-1}$, where $ω$ is the associated angular frequency.

hep-ex↗

arXiv2017

Observation of the doubly charmed baryon $Ξ_{cc}^{++}$

A highly significant structure is observed in the $Λ_c^+K^-π^+π^+$ mass spectrum, where the $Λ_c^+$ baryon is reconstructed in the decay mode $pK^-π^+$. The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon $Ξ_{cc}^{++}$. The difference between the masses of the $Ξ_{cc}^{++}$ and $Λ_c^+$ states is measured to be $1334.94 \pm 0.72 (\mathrm{stat}) \pm 0.27 (\mathrm{syst}~\mathrm{MeV}/c^2$, and the $Ξ_{cc}^{++}$ mass is then determined to be $3621.40 \pm 0.72 (\mathrm{stat}) \pm 0.27 (\mathrm{syst} \pm 0.14 \, (Λ_c^+)~\mathrm{MeV}/c^2$, where the last uncertainty is due to the limited knowledge of the $Λ_c^+$ mass. The state is observed in a sample of proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.7 $\mathrm{fb}^{-1}$, and confirmed in an additional sample of data collected at 8 TeV.

hep-ex↗

arXiv2017

Study of prompt D$^0$ meson production in pPb collisions at $\sqrt{s}$=5 TeV

Production of prompt D$^0$ mesons is studied in proton-lead and lead-proton collisions recorded at the LHCb detector at the LHC. The data sample corresponds to an integrated luminosity of $1.58\pm0.02$ nb$^{-1}$ recorded at a nucleon-nucleon centre-of-mass energy of $\sqrt{s}=5$ TeV. Measurements of the differential cross-section, the forward-backward production ratio and the nuclear modification factor are reported using D$^0$ candidates with transverse momenta less than 10 GeV/c and rapidities in the ranges $1.5<y^*<4.0$ and $-5.0<y^*<-2.5$ in the nucleon-nucleon centre-of-mass system.

hep-ex↗

arXiv2015

Trapping in irradiated p-on-n silicon sensors at fluences anticipated at the HL-LHC outer tracker

The degradation of signal in silicon sensors is studied under conditions expected at the CERN High-Luminosity LHC. 200 $μ$m thick n-type silicon sensors are irradiated with protons of different energies to fluences of up to $3 \cdot 10^{15}$ neq/cm$^2$. Pulsed red laser light with a wavelength of 672 nm is used to generate electron-hole pairs in the sensors. The induced signals are used to determine the charge collection efficiencies separately for electrons and holes drifting through the sensor. The effective trapping rates are extracted by comparing the results to simulation. The electric field is simulated using Synopsys device simulation assuming two effective defects. The generation and drift of charge carriers are simulated in an independent simulation based on PixelAV. The effective trapping rates are determined from the measured charge collection efficiencies and the simulated and measured time-resolved current pulses are compared. The effective trapping rates determined for both electrons and holes are about 50% smaller than those obtained using standard extrapolations of studies at low fluences and suggests an improved tracker performance over initial expectations.

physics.ins-det↗