arXiv subjects

K. Belous

Publications and source records attributed to K. Belous.

At least 325 records · Page 18Linked to original sources

arXiv2021

Observation of excited $Ω_c^0$ baryons in $Ω_b^- \to Ξ_c^+ K^-π^-$ decays

The first observation of the $Ω_b^- \to Ξ_c^+ K^- π^-$ decay is reported using $pp$ collision data at centre-of-mass energies of 7, 8 and 13\,$\mathrm{TeV}$ collected by the LHCb experiment, corresponding to an integrated luminosity of 9\,$\mathrm{fb}^{-1}$. Four excited $Ω_c^0$ baryons are observed in the $Ξ_c^+ K^-$ mass projection of the $Ω_b^- \to Ξ_c^+ K^- π^-$ decays with the significance of each exceeding five standard deviations. They coincide with the states previously observed in prompt \proton\proton and $e^+e^-$ production. Relative production rates, masses and natural widths of the states are measured, and a test of spin hypotheses is performed. Moreover, the branching ratio of $Ω_b^- \to Ξ_c^+ K^- π^-$ is measured relative to the $Ω_b^- \to Ω_c^0 π^-$ decay mode and a precise measurement of the $Ω_b^-$ mass of \mbox{$6044.3 \pm 1.2 \pm 1.1^{\,+0.19}_{\,-0.22}\,\mathrm{MeV}$} is obtained.

hep-ex↗

arXiv2021

First measurement of the $CP$-violating phase in $B^0_s\to J/ψ(\to e^+e^-)ϕ$ decays

A flavour-tagged time-dependent angular analysis of $B^0_s\to J/ψϕ$ decays is presented where the $J/ψ$ meson is reconstructed through its decay to an $e^+e^-$ pair. The analysis uses a sample of $pp$ collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb$^{-1}$. The $CP$-violating phase and lifetime parameters of the $B^0_s$ system are measured to be $ϕ_s=0.00\pm0.28\pm0.07$ rad, $ΔΓ_s=0.115\pm0.045\pm0.011$ ps$^{-1}$ and $Γ_s=0.608\pm0.018\pm0.012$ ps$^{-1}$ where the first uncertainty is statistical and the second systematic. This is the first time that $CP$-violating parameters are measured in the $B^0_s\to J/ψϕ$ decay with an $e^+e^-$ pair in the final state. The results are consistent with previous measurements in other channels and with the Standard Model predictions.

hep-ex↗

arXiv2021

Measurements of $q^2$ Moments of Inclusive $B \rightarrow X_c \ell^+ ν_{\ell}$ Decays with Hadronic Tagging

We present the measurement of the first to fourth order moments of the four-momentum transfer squared, $q^2$, of inclusive $B \rightarrow X_c \ell^+ ν_{\ell}$ decays using the full Belle data set of 711 $\mathrm{fb}^{-1}$ of integrated luminosity at the $Υ(4S)$ resonance where $\ell = e, μ$. The determination of these moments and their systematic uncertainties open new pathways to determine the absolute value of the CKM matrix element $V_{cb}$ using a reduced set of matrix elements of the heavy quark expansion. In order to identify and reconstruct the $X_c$ system, we reconstruct one of the two $B$-mesons using machine learning techniques in fully hadronic decay modes. The moments are measured with progressively increasing threshold selections on $q^2$ starting with a lower value of 3.0 $\mathrm{GeV}^2$ in steps of 0.5 $\mathrm{GeV}^2$ up to a value of 10.0 $\mathrm{GeV}^2$. The measured moments are further unfolded, correcting for reconstruction and selection effects as well as QED final state radiation. We report the moments separately for electron and muon final states and observe no lepton flavor universality violating effects.

hep-ex↗

arXiv2021

Measurement of Differential Branching Fractions of Inclusive ${B \to X_u \, \ell^+\, ν_{\ell}}$ Decays

The first measurements of differential branching fractions of inclusive semileptonic ${B \to X_u \, \ell^+\, ν_{\ell}}$ decays are performed using the full Belle data set of 711 fb$^{-1}$ of integrated luminosity at the $Υ(4S)$ resonance and for $\ell = e, μ$. Differential branching fractions are reported as a function of the lepton momentum, the four-momentum-transfer squared, light-cone momenta, the hadronic mass, and the hadronic mass squared. They are obtained by subtracting the backgrounds from semileptonic ${B \to X_c \, \ell^+\, ν_{\ell}}$ decays and other processes, and corrected for resolution and acceptance effects. The measured distributions are compared to predictions from inclusive and hybrid ${B \to X_u \, \ell^+\, ν_{\ell}}$ calculations.

hep-ex↗

arXiv2021

Measurement of $J/ψ$ production cross-sections in $pp$ collisions at $\sqrt{s}=5$ TeV

The production cross-sections of $J/ψ$ mesons in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=5$ TeV are measured using a data sample corresponding to an integrated luminosity of $9.13\pm0.18~\text{pb}^{-1}$, collected by the LHCb experiment. The cross-sections are measured differentially as a function of transverse momentum, $p_{\text{T}}$, and rapidity, $y$, and separately for $J/ψ$ mesons produced promptly and from beauty hadron decays (nonprompt). With the assumption of unpolarised $J/ψ$ mesons, the production cross-sections integrated over the kinematic range $0<p_{\text{T}}<20~\text{GeV}/c$ and $2.0<y<4.5$ are $8.154\pm0.010\pm0.283~μ\text{b}$ for prompt $J/ψ$ mesons and $0.820\pm0.003\pm0.034~μ\text{b}$ for nonprompt $J/ψ$ mesons, where the first uncertainties are statistical and the second systematic. These cross-sections are compared with those at $\sqrt{s}=8$ TeV and $13$ TeV, and are used to update the measurement of the nuclear modification factor in proton-lead collisions for $J/ψ$ mesons at a centre-of-mass energy per nucleon pair of $\sqrt{s_{\text{NN}}}=5$ TeV. The results are compared with theoretical predictions.

hep-ex↗

arXiv2021

Search for $B^{0} \to τ^\pm \ell^\mp$ ($\ell=e,μ$) with a hadronic tagging method at Belle

We present a search for the lepton-flavor-violating decays $B^{0} \to τ^\pm \ell^\mp$, where $\ell=(e,\,μ)$, using the full data sample of $772 \times 10^6$ $B \overline{B}$ pairs recorded by the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We use events in which one $B$ meson is fully reconstructed in a hadronic decay mode. The $τ^\pm$ lepton is reconstructed indirectly using the momentum of the reconstructed $B$ and that of the $\ell^\mp$ from the signal decay. We find no evidence for $B^{0} \to τ^\pm \ell^\mp$ decays and set upper limits on their branching fractions at 90% confidence level of $\cal B$($B^{0} \to τ^\pm μ^{\mp}$)$ < 1.5 \times 10^{-5}$ and $\cal B$($B^{0} \to τ^\pm e^{\mp}$)$ < 1.6 \times 10^{-5}$.

hep-ex↗

arXiv2021

Angular analysis of the rare decay $B_s^0\toϕμ^+μ^-$

An angular analysis of the rare decay $B^0_s\rightarrowϕμ^+μ^-$ is presented, using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of $7$, $8$ and $13~\rm{TeV}$, corresponding to an integrated luminosity of $8.4~\rm{fb}^{-1}$. The observables describing the angular distributions of the decay $B^0_s\rightarrowϕμ^+μ^-$ are determined in regions of $q^2$, the square of the dimuon invariant mass. The results are consistent with Standard Model predictions.

hep-ex↗

arXiv2021

Study of the $B_c^+$ decays into charmonia and three light hadrons

Using proton-proton collision data, corresponding to an integrated luminosity of $9fb^{-1}$ collected with the LHCb detector, seven decay modes of the $B_c^+$ meson into a $J/ψ$ or $ψ(2S)$ meson and three charged hadrons, kaons or pions, are studied. The decays $B_c^+\rightarrow ( ψ(2S) \rightarrow J/ψπ^+ π^-)π^+ $, $B_c^+\rightarrow ψ(2S)π^+π^+π^-$, $B_c^+\rightarrow J/ψK^+π^+π^-$ and $B_c^+\rightarrow K^+K^+K^-$ are observed for the first time, and evidence for the $B_c^+\rightarrow ψ(2S)K^+K^-π^+$ decay is found, where $J/ψ$ and $ψ(2S)$ mesons are reconstructed in their dimuon decay modes. The ratios of branching fractions between the different $B_c^+$ decays are reported as well as the fractions of the decays proceeding via intermediate resonances. The results largely support the factorisation approach used for a theoretical description of the studied decays.

hep-ex↗

arXiv2021

Centrality determination in heavy-ion collisions with the LHCb detector

The centrality of heavy-ion collisions is directly related to the medium created therein. A procedure to determine the centrality of collisions with the LHCb detector is implemented for lead-lead collisions at $\sqrt{s_{\scriptscriptstyle\text{NN}}}=5\, \mathrm{TeV}$ and lead-neon fixed-target collisions at $\sqrt{s_{\scriptscriptstyle\text{NN}}}=69\, \mathrm{GeV}$. The energy deposits in the electromagnetic calorimeter are used to determine and define the centrality classes. The correspondence between the number of participants and the centrality for the lead-lead collisions is in good agreement with the correspondence found in other experiments, and the centrality measurements for the lead-neon collisions presented here are the first performed in fixed-target collisions at the LHC.

nucl-ex↗

arXiv2021

Search for time-dependent $CP$ violation in $D^0 \to K^+ K^-$ and $D^0 \to π^+ π^-$ decays

A search for time-dependent violation of the charge-parity symmetry in $D^0 \to K^+ K^-$ and $D^0 \to π^+ π^-$ decays is performed at the LHCb experiment using proton-proton collision data recorded from 2015 to 2018 at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb$^{-1}$. The $D^0$ meson is required to originate from a $D^*(2010)^+ \to D^0 π^+$ decay, such that its flavour at production is identified by the charge of the accompanying pion. The slope of the time-dependent asymmetry of the decay rates of $D^0$ and $\bar{D}^0$ mesons into the final states under consideration is measured to be $ΔY_{K^+ K^-} = (-2.3 \pm 1.5 \pm 0.3) \times 10^{-4}$, $ΔY_{π^+ π^-} = (-4.0 \pm 2.8 \pm 0.4)\times 10^{-4}$, where the first uncertainties are statistical and the second are systematic. These results are compatible with the conservation of the charge-parity symmetry at the level of 2 standard deviations and improve the precision by nearly a factor of two.

hep-ex↗

arXiv2021

Search for $B^0$ meson decays into $Λ$ and missing energy with a hadronic tagging method at Belle

We present a search for the decays of $B^0$ mesons into a final state containing a $Λ$ baryon and missing energy. These results are obtained from a $711\text{fb}^{-1}$ data sample that contains $772 \times 10^6$ $B{\kern 0.18em}\overline{\kern -0.18em B}$ pairs and was collected near the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We use events in which one $B$ meson is fully reconstructed in a hadronic decay mode and require the remainder of the event to consist of only a single $Λ$. No evidence for these decays is found and we set $90\%$ confidence level upper limits on the branching fractions in the range $2.1$-$3.8\times 10^{-5}$. This measurement provides the world's most restrictive limits, with implications for baryogenesis and dark matter production.

hep-ex↗

arXiv2021

Search for the doubly charmed baryon $\itΩ_{cc}^{+}$

A search for the doubly charmed baryon $\itΩ_{cc}^{+}$ with the decay mode $\itΩ_{cc}^{+}\to\itΞ_c^{+}K^{-}π^{+}$ is performed using proton-proton collision data at a centre-of-mass energy of 13$\mathrm{\,Te\kern -0.1em V}$ collected by the LHCb experiment from 2016 to 2018, corresponding to an integrated luminosity of $5.4\,\mathrm{fb}^{-1}$. No significant signal is observed within the invariant mass range of 3.6 to 4.0$\mathrm{\,Ge\kern -0.1em V}/c^2$. Upper limits are set on the ratio $R$ of the production cross-section times the total branching fraction of the $\itΩ_{cc}^{+}\to\itΞ_c^{+}K^{-}π^{+}$ decay with respect to the $\itΞ_{cc}^{++}\to\itΛ_c^{+}K^{-}π^{+}π^{+}$ decay. Upper limits at 95% credibility level for $R$ in the range $0.005$ to $0.11$ are obtained for different hypotheses on the $\itΩ_{cc}^{+}$ mass and lifetime in the rapidity range from 2.0 to 4.5 and transverse momentum range from 4 to 15$\mathrm{\,Ge\kern -0.1em V}/c$.

hep-ex↗

arXiv2021

Observation of a $Λ_b^0-\overlineΛ_b^0$ production asymmetry in proton-proton collisions at $\sqrt{s} = 7 \textrm{ and } 8\,\textrm{TeV}$

This article presents differential measurements of the asymmetry between $Λ_b^0$ and $\overlineΛ_b^0$ baryon production rates in proton-proton collisions at centre-of-mass energies of $\sqrt{s}=7$ and $8\,\textrm{TeV}$ collected with the LHCb experiment, corresponding to an integrated luminosity of $3\,\textrm{fb}^{-1}$. The $Λ_b^0$ baryons are reconstructed through the inclusive semileptonic decay $Λ_b^0\rightarrowΛ_c^+μ^-\overlineν_μX$. The production asymmetry is measured both in intervals of rapidity in the range $2.15<y<4.10$ and transverse momentum in $2<p_T<27\,\textrm{GeV}/c$. The results are found to be incompatible with symmetric production with a significance of 5.8 standard deviations for both $\sqrt{s}=7$ and $8\,\textrm{TeV}$ data, assuming no $C\!P$ violation in the decay. There is evidence for a trend as a function of rapidity with a significance of 4 standard deviations. Comparisons to predictions from hadronisation models in PYTHIA and heavy-quark recombination are provided. This result constitutes the first observation of a particle-antiparticle asymmetry in $b$-hadron production at LHC energies.

hep-ex↗

arXiv2021

Branching fraction measurements of the rare $B^0_s\rightarrowϕμ^+μ^-$ and $B^0_s\rightarrow f_2^\prime(1525)μ^+μ^-$ decays

The branching fraction of the rare $B^0_s\rightarrowϕμ^+μ^-$ decay is measured using data collected by the LHCb experiment at center-of-mass energies of $7$, $8$ and $13\,\rm{TeV}$, corresponding to integrated luminosities of $1$, $2$ and $6\,{\rm fb}^{-1}$, respectively. The branching fraction is reported in intervals of $q^2$, the square of the dimuon invariant mass. In the $q^2$ region between $1.1$ and $6.0\,{\rm Ge\kern -0.1em V}^2\!/c^4$, the measurement is found to lie $3.6$ standard deviations below a Standard Model prediction based on a combination of Light Cone Sum Rule and Lattice QCD calculations. In addition, the first observation of the rare $B^0_s\rightarrow f_2^\prime(1525)μ^+μ^-$ decay is reported with a statistical significance of nine standard deviations and its branching fraction is determined.

hep-ex↗

arXiv2021

Search for $CP$ violation in $Ξ_b^- \to p K^- K^-$ decays

A search for $CP$ violation in charmless three-body $Ξ_b^- \to p K^- K^-$ decays is performed using $pp$ collision data recorded with the LHCb detector, corresponding to integrated luminosities of $1\,\text{fb}^{-1}$ at a centre-of-mass energy $\sqrt{s} = 7\,\text{TeV}$, $2\,\text{fb}^{-1}$ at $\sqrt{s} = 8\,\text{TeV}$ and $2\,\text{fb}^{-1}$ at $\sqrt{s} = 13\,\text{TeV}$. A good description of the phase-space distribution is obtained with an amplitude model containing contributions from $Σ(1385)$, $Λ(1405)$, $Λ(1520)$, $Λ(1670)$, $Σ(1775)$ and $Σ(1915)$ resonances. The model allows for $CP$-violation effects, which are found to be consistent with zero. The branching fractions of $Ξ_b^- \to Σ(1385) K^-$, $Ξ_b^- \to Λ(1405) K^-$, $Ξ_b^- \to Λ(1520) K^-$, $Ξ_b^- \to Λ(1670) K^-$, $Ξ_b^- \to Σ(1775) K^-$ and $Ξ_b^- \to Σ(1915) K^-$ decays are also reported. In addition, an upper limit is placed on the product of ratios of $Ω_b^-$ and $Ξ_b^-$ fragmentation fractions and the $Ω_b^- \to p K^- K^-$ and $Ξ_b^- \to p K^- K^-$ branching fractions.

hep-ex↗

arXiv2021

Measurement of the branching fraction of $Λ_c^+ \to p ω$ decay at Belle

Using 980.6 $\rm fb^{-1}$ of data collected with the Belle detector operating at the KEKB asymmetric-energy $e^+e^-$ collider, we present a measurement of the branching fraction of the singly Cabibbo-suppressed decay $Λ_c^+ \to p ω$. A clear $Λ_c^+$ signal is observed for $Λ_c^+ \to p ω$ with a statistical significance of 9.1 standard deviations, and we measure the ratio of branching fractions ${\cal B}(Λ_c^+ \to p ω)/{\cal B}(Λ_c^+ \to p K^- π^+) = (1.32 \pm 0.12 (\rm stat) \pm 0.10 (\rm syst))\times 10^{-2}$, from which we infer the branching fraction ${\cal B}(Λ_c^+ \to p ω) = (8.27 \pm 0.75 (\rm stat) \pm 0.62 (\rm syst) \pm 0.42 (\rm ref))\times 10^{-4}$. The first quoted uncertainty is statistical, the second systematic, and the third from the reference mode $Λ_c^+ \to p K^- π^+$.

hep-ex↗

arXiv2021

Study of the $ψ_2(3823)$ and $χ_{c1}(3872)$ states in $B^+ \rightarrow \left( Jψπ^+π^-\right)K^+$ decays

The decays $B^+\rightarrow J/ψπ^+ π^- K^+$ are studied using a data set corresponding to an integrated luminosity of 9fb$^{-1}$ collected with the LHCb detector in proton-proton collisions between 2011 and 2018. Precise measurements of the ratios of branching fractions with the intermediate $ψ_2(3823)$, $χ_{c1}(3872)$ and $ψ(2S)$ states are reported. The decay of $B^+\rightarrow ψ_2(3823)K^+$ with $ψ_2(3823)\rightarrow Jψπ^+π^-$ is observed for the first time with a significance of 5.1 standard deviations. The mass differences between the $ψ_2(3823)$, $χ_{c1}(3872)$ and $ψ(2S)$ states are measured to be $$ \begin{array}{rcl} m_{χ_{c1(3872)}} - m_{ψ_2(3823)} &= & 47.50 \pm 0.53 \pm 0.13\,\mathrm{MeV/}c^2\,, \\ m_{ψ_2(3823)} - m_{ψ(2S)} &= & 137.98 \pm 0.53 \pm 0.14\,\mathrm{MeV/}c^2\,, \\ m_{χ_{c1}(3872)} - m_{ψ(2S)} &= & 185.49 \pm 0.06 \pm 0.03\,\mathrm{MeV/}c^2\,, \end{array} $$ resulting in the most precise determination of the $χ_{c1}(3782)$ mass. The width of the $ψ_2(3823)$ state is found to be below 5.2MeV at 90\% confidence level. The Breit-Wigner width of the $χ_{c1}(3872)$ state is measured to be $$ Γ^{\mathrm{BW}}_{χ_{c1}(3872)} = 0.96^{+0.19}_{-0.18}\pm0.21 \mathrm{MeV},$$ which is inconsistent with zero by 5.5 standard deviations.

hep-ex↗

arXiv2021

Measurement of $CP$ asymmetry in $D^0 \to K^0_S K^0_S$ decays

A measurement of the $CP$ asymmetry in $D^0 \to K^0_S K^0_S$ decays is reported, based on a data sample of proton-proton collisions collected by the LHCb experiment from 2015 to 2018, corresponding to an integrated luminosity of 6 fb$^{-1}$. The flavor of the $D^0$ candidate is determined using the charge of the $D^{*\pm}$ meson, from which the decay is required to originate. The $D^0 \to K^+ K^-$ decay is used as a calibration channel. The time-integrated $CP$ asymmetry for the $D^0 \to K^0_S K^0_S$ mode is measured to be: $$A^{CP}(D^0 \to K^0_S K^0_S) = (-3.1\pm 1.2\pm 0.4 \pm 0.2)\%, $$ where the first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty on the $CP$ asymmetry of the calibration channel. This is the most precise determination of this quantity to date.

hep-ex↗