arXiv subjects

K. Belous

Publications and source records attributed to K. Belous.

At least 289 records · Page 16Linked to original sources

arXiv2022

$J/ψ$ photo-production in Pb-Pb peripheral collisions at $\sqrt{s_{\rm NN}}$ = 5 TeV

The photo-production of $J/ψ$ mesons at low transverse momentum is studied in peripheral lead-lead collisions collected by the LHCb experiment at a centre-of-mass energy per nucleon pair of 5 TeV, corresponding to an integrated luminosity of 210 $\rm{μb}^{-1}$. The $J/ψ$ candidates are reconstructed through the prompt decay into two muons of opposite charge in the rapidity region of $2.0<y<4.5$. The results significantly improve previous measurements and are compared to the latest theoretical prediction.

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arXiv2022

Observation of the doubly charmed baryon decay $\it{Ξ_{cc}^{++}\to Ξ_{c}^{'+}π^{+}}$

The $\it{Ξ_{cc}^{++}\to Ξ_{c}^{'+}π^{+}}$ decay is observed using proton-proton collisions collected by the LHCb experiment at a centre-of-mass energy of $13\mathrm{\,Te\kern -0.1em V}$, corresponding to an integrated luminosity of $5.4\,\mathrm{fb}^{-1}$. The $\it{Ξ_{cc}^{++}\to Ξ_{c}^{'+}π^{+}}$ decay is reconstructed partially, where the photon from the $\it{Ξ_{c}^{'+} \to Ξ_{c}^{+}γ}$ decay is not reconstructed and the $pK^-π^+$ final state of the $\it{Ξ_{c}^{+}}$ baryon is employed. The $\it{Ξ_{cc}^{++}\to Ξ_{c}^{'+}π^{+}}$ branching fraction relative to that of the $\it{Ξ_{cc}^{++}\to Ξ_{c}^{+}π^{+}}$ decay is measured to be $1.41 \pm 0.17 \pm 0.10$, where the first uncertainty is statistical and the second systematic.

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arXiv2022

Measurement of the charm mixing parameter $y_{CP} - y_{CP}^{Kπ}$ using two-body $D^0$ meson decays

A measurement of the ratios of the effective decay widths of $D^0 \to π^-π^+$ and $D^0 \to K^-K^+$ decays over that of $D^0 \to K^-π^+$ decays is performed with the LHCb experiment using proton-proton collisions at a centre-of-mass energy of $13 \, \mathrm{TeV}$, corresponding to an integrated luminosity of $6 \, \mathrm{fb^{-1}}$. These observables give access to the charm mixing parameters $y_{CP}^{ππ} - y_{CP}^{Kπ}$ and $y_{CP}^{KK} - y_{CP}^{Kπ}$, and are measured as $y_{CP}^{ππ} - y_{CP}^{Kπ} = (6.57 \pm 0.53 \pm 0.16) \times 10^{-3}$, $y_{CP}^{KK} - y_{CP}^{Kπ} = (7.08 \pm 0.30 \pm 0.14) \times 10^{-3}$, where the first uncertainties are statistical and the second systematic. The combination of the two measurements is $y_{CP} - y_{CP}^{Kπ} = (6.96 \pm 0.26 \pm 0.13) \times 10^{-3}$, which is four times more precise than the previous world average.

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arXiv2022

Study of charmonium and charmonium-like contributions in $B^+ \rightarrow J/ψηK^+$ decays

A study of $B^+ \rightarrow J/ψηK^+$ decays, followed by $J/ψ\rightarrow μ^+ μ^-$ and $η\rightarrow γγ$, is performed using a dataset collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb$^{-1}$. The $J/ψη$ mass spectrum is investigated for contributions from charmonia and charmonium-like states. Evidence is found for the $B^+\rightarrow \left( ψ_2(3823) \rightarrow J/ψη\right) K^+$ and $B^+\rightarrow \left( ψ(4040) \rightarrow J/ψη\right) K^+$ decays with significance of 3.4 and 4.7~standard deviations, respectively. This constitutes the~first~evidence for the $ψ_2(3823) \rightarrow J/ψη$ decay.

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arXiv2022

Tests of lepton universality using $B^0\to K^0_S \ell^+ \ell^-$ and $B^+\to K^{*+} \ell^+ \ell^-$ decays

Tests of lepton universality in $B^0\to K^0_S \ell^+ \ell^-$ and $B^+\to K^{*+} \ell^+ \ell^-$ decays where $\ell$ is either an electron or a muon are presented. The differential branching fractions of $B^0\to K^0_S e^+ e^-$ and $B^+\to K^{*+} e^+ e^-$ decays are measured in intervals of the dilepton invariant mass squared. The measurements are performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of $9\, \mathrm{fb}^{-1}$. The results are consistent with the Standard Model and previous tests of lepton universality in related decay modes. The first observation of $B^0 \to K^0_S e^+ e^-$ and $B^+ \to K^{*+} e^+ e^-$ decays is reported.

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arXiv2022

Search for the decay $B^0\toϕμ^+μ^-$

A search for the decay $B^0\toϕμ^+μ^-$ is performed using proton-proton collisions at centre-of-mass energies of 7, 8, and 13 TeV collected by the LHCb experiment and corresponding to an integrated luminosity of 9 fb$^{-1}$. No evidence for the $B^0\to ϕμ^+ μ^-$ decay is found and an upper limit on the branching fraction, excluding the $ϕ$ and charmonium regions in the dimuon spectrum, of $4.4 \times 10^{-3}$ at a 90$\%$ credibility level, relative to that of the $B^0_s \to ϕμ^+ μ^-$ decay, is established. Using the measured $B^0_s\toϕμ^+μ^-$ branching fraction and assuming a phase-space model, the absolute branching fraction of the decay $B^0\to ϕμ^+ μ^-$ in the full $q^2$ range is determined to be less than $3.2 \times 10^{-9}$ at a 90$\%$ credibility level.

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arXiv2022

Observation of the $B^0\rightarrow\overline{D}^{0}K^{+}π^{-}$ and $B_s^0\rightarrow\overline{D}^{0}K^{-}π^{+}$ decays

The first observations of $B^0\rightarrow\overline{D}^{*}(2007)^{0}K^{+}π^{-}$ and $B_s^0\rightarrow\overline{D}^{*}(2007)^{0}K^{-}π^{+}$ decays are presented, and their branching fractions relative to that of the $B^0\rightarrow\overline{D}^{*}(2007)^{0}π^{+}π^{-}$ decay are reported. These modes can potentially be used to investigate the spectroscopy of charm and charm-strange resonances and to determine the angle $γ$ of the CKM unitarity triangle. It is also important to understand them as a source of potential background in determinations of $γ$ from $B^{+}\rightarrow DK^{+}$ and $B^{0}\rightarrow DK^{+}π^{-}$ decays. The analysis is based on a sample corresponding to an integrated luminosity of $5.4 ~\rm{fb}^{-1}$ of proton--proton collision data at $13 ~\rm{TeV}$ centre-of-mass energy recorded with the LHCb detector. The $\overline{D}^{*}(2007)^{0}$ mesons are fully reconstructed in the $\overline{D}^{0}π^{0}$ and $\overline{D}^{0}γ$ channels, with the $\overline{D}^{0} \rightarrow K^{+}π^{-}$ decay. A novel weighting method is used to subtract background while simultaneously applying an event-by-event efficiency correction to account for resonant structures in the decays.

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arXiv2022

First test of Lepton Flavor Universality in the charmed baryon decays $Ω^{0}_{c} \to Ω^{-} \ell^{+} ν_{\ell}$ using data of the Belle experiment

We present the first observation of the $Ω_{c}^{0} \to Ω^{-} μ^{+} ν_μ$ decay and present measurements of the branching fraction ratios of the $Ω_{c}^{0} \to Ω^{-} \ell^{+} ν_{\ell}$ decays compared to the reference mode $Ω_{c}^{0} \to Ω^{-} π^+$, ($\ell = e$ or $μ$). This analysis is based on 89.5 fb$^{-1}$, 711 fb$^{-1}$, and 121.1 fb$^{-1}$ data samples collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider at the center-of-mass energies of 10.52 GeV, 10.58 GeV, and 10.86 GeV, respectively. The $Ω_{c}^{0}$ signal yields are extracted by fitting $M_{Ω^{-} \ell^{+}}$ and $M_{Ω^{-}π^+}$ spectra. The branching fraction ratios ${\cal B}(Ω_{c}^{0} \to Ω^{-} e^{+} ν_{e})/{\cal B}(Ω_{c}^{0} \to Ω^{-} π^+)$ and ${\cal B}(Ω_{c}^{0} \to Ω^{-} μ^{+} ν_μ)/{\cal B}(Ω_{c}^{0} \to Ω^{-} π^+)$ are measured to be $1.98 \pm0.13~({\rm stat.}) \pm 0.08~({\rm syst.})$ and $ 1.94 \pm 0.18~({\rm stat.}) \pm 0.10~({\rm syst.})$, respectively. The ratio of ${\cal B}(Ω_{c}^{0} \to Ω^{-} e^{+} ν_{e})/{\cal B}(Ω_{c}^{0} \to Ω^{-} μ^{+} ν_μ)$ is measured to be $1.02 \pm 0.10~({\rm stat.}) \pm 0.02~({\rm syst.})$, which is consistent with the expectation of lepton flavor universality.

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arXiv2022

Observation of two new excited ${\itΞ}_b^0$ states decaying to ${\itΛ}_b^0 K^-π^+$

Two narrow resonant states are observed in the ${\itΛ}_b^0 K^-π^+$ mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13$~\rm TeV$, collected by the LHCb experiment and corresponding to an integrated luminosity of $6~{\rm fb}^{-1}$. The minimal quark content of the ${\itΛ}_b^0 K^-π^+$ system indicates that these are excited ${\itΞ}_b^0$ baryons. The masses of the ${\itΞ}_b(6327)^0$ and ${\itΞ}_b(6333)^0$ states are $m({\itΞ}_b(6327)^0) = 6327.28 ^{\,+\,0.23}_{\,-\,0.21} \pm 0.12 \pm 0.24~{\rm MeV}$ and $m({\itΞ}_b(6333)^0) = 6332.69 ^{\,+\,0.17}_{\,-\,0.18} \pm 0.03 \pm 0.22~{\rm MeV}$, respectively, with a mass splitting of $Δm = 5.41 ^{\,+\,0.26}_{\,-\,0.27} \pm 0.12 ~{\rm MeV}$, where the uncertainties are statistical, systematic and due to the ${\itΛ}_b^0$ mass measurement. The measured natural widths of these states are consistent with zero, with upper limits of $Γ({\itΞ}_b(6327)^0)<2.20~(2.56) ~{\rm MeV}$ and $Γ({\itΞ}_b(6333)^0)<1.60~(1.92) ~{\rm MeV}$ at a $90\%~(95\%)$ credibility level. The significance of the two-peak hypothesis is larger than nine (five) Gaussian standard deviations compared to the no-peak (one-peak) hypothesis. The masses, widths and resonant structure of the new states are in good agreement with the expectations for a doublet of 1$D$ ${\itΞ}_b^0$ resonances.

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arXiv2022

Measurement of the photon polarization in $Λ_b \to Λγ$ decays

The photon polarization in $b \to s γ$ transitions is measured for the first time in radiative b-baryon decays exploiting the unique spin structure of $Λ_b \to Λγ$ decays. A data sample corresponding to an integrated luminosity of $6\;fb^{-1}$ collected by the LHCb experiment in $pp$ collisions at a center-of-mass energy of $13\;TeV$ is used. The photon polarization is measured to be $α_γ= 0.82^{\,+\,0.17\,+\,0.04}_{\,-\,0.26\,-\,0.13}$, where the first uncertainty is statistical and the second systematic. This result is in agreement with the Standard Model prediction and previous measurements in b-meson decays. Charge-parity breaking effects are studied for the first time in this observable and found to be consistent with $CP$ symmetry.

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arXiv2022

Search for charged lepton flavor violating decays of $Υ(1S)$

We present a search for the charged lepton-flavor-violating decays $Υ(1S)\rightarrow\ell\ell^\prime$ and radiative charged lepton-flavour-violating decays $Υ(1S)\rightarrowγ\ell\ell^\prime$ [$\ell,\ell^\prime = e, μ, τ$] using the 158 million $Υ(2S)$ sample collected by the Belle detector at the KEKB collider. This search uses $Υ(1S)$ mesons produced in $π^+π^-Υ(1S)$ transitions. We do not find any significant signal, so we provide upper limits on the branching fractions at the 90% confidence level.

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arXiv2022

Observation of $Λ_b^0\rightarrow D^+ p π^-π^-$ and $Λ_b^0\rightarrow D^{*+} p π^-π^-$ decays

The multihadron decays $Λ_b^0\rightarrow D^+ p π^-π^-$ and $Λ_b^0\rightarrow D^{*+} p π^-π^-$ are observed in data corresponding to an integrated luminosity of 3fb$^{-1}$, collected in proton-proton collisions at centre-of-mass energies of 7 and 8TeV by the LHCb detector. Using the~decay $Λ_b^0\rightarrow Λ_c^+ π^+ π^-π^-$ as a normalisation channel, the ratio of branching fractions is measured to be $$ \frac { {\mathcal{B}} ( Λ_b^0\rightarrow D^+ p π^-π^- ) } { {\mathcal{B}} ( Λ_b^0\rightarrow Λ_c^+ π^+ π^-π^- ) } \times \frac { {\mathcal{B}} ( D^+ \rightarrow K^-π^+π^+) } { {\mathcal{B}} ( Λ_c^+ \rightarrow p K^-π^+ ) } = ( 5.35 \pm 0.21 \pm 0.16 ) \% \,, $$ where the first uncertainty is statistical and the second systematic. The ratio of branching fractions for $Λ_b^0\rightarrow D^{*+} p π^-π^-$ and $Λ_b^0\rightarrow D^+ p π^-π^-$ decays is found to be $$ \frac{ {\mathcal{B}} ( Λ_b^0\rightarrow D^{*+} p π^-π^- )} { {\mathcal{B}} ( Λ_b^0\rightarrow D^{+} p π^-π^- )} \times ( {\mathcal{B}}( D^{*+} \rightarrow π^0 ) + {\mathcal{B}}( D^{*+} \rightarrow γ)) = ( 61.3 \pm 4.3 \pm 4.0 ) \% \,. $$

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arXiv2022

Measurement of prompt charged-particle production in pp collisions at a centre-of-mass energy of 13 TeV

The differential cross-section of prompt inclusive production of long-lived charged particles in proton-proton collisions is measured using a data sample recorded by the LHCb experiment at a centre-of-mass energy of ${\sqrt{s} = 13\,\mathrm{TeV}}$. The data sample, collected with an unbiased trigger, corresponds to an integrated luminosity of ${5.4\,\mathrm{nb}^{-1}}$. The differential cross-section is measured as a function of transverse momentum and pseudorapidity in the ranges ${p_\mathrm{T} \in [0.08, 10)\,\mathrm{GeV}\,c^{-1}}$ and ${η\in [2.0, 4.8)}$ and is determined separately for positively and negatively charged particles. The results are compared with predictions from various hadronic-interaction models.

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arXiv2022

Analysis of neutral $B$-meson decays into two muons

Branching fraction and effective lifetime measurements of the rare decay $B^0_s\toμ^+μ^-$ and searches for the decays $B^0\toμ^+μ^-$ and $B^0_s\toμ^+μ^-γ$ are reported using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of $7$ TeV, $8$ TeV and $13$ TeV, corresponding to a luminosity of $9$ fb$^{-1}$. The branching fraction ${\mathcal{B}}(B^0_s\toμ^+μ^-)=\left(3.09^{+0.46+0.15}_{-0.43-0.11}\right)\times 10^{-9}$ and the effective lifetime $τ(B^0_s\toμ^+μ^-)=(2.07\pm 0.29\pm 0.03)$ are measured, where the first uncertainty is statistical and the second systematic. No significant signal for $B^0\toμ^+μ^-$ and $B^0_s\toμ^+μ^-γ$ decays is found and upper limits $\mathcal{B}(B^0\toμ^+μ^-)<2.6\times 10^{-10}$ and $\mathcal{B}(B^0_s\toμ^+μ^-γ)<2.0\times 10^{-9}$ at the 95% CL are determined, where the latter is limited to the range $m_{μμ} > 4.9$ GeV$/c^2$. The results are in agreement with the Standard Model expectations.

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arXiv2022

Study of $Z$ bosons produced in association with charm in the forward region

Events containing a $Z$ boson and a charm jet are studied for the first time in the forward region of proton-proton collisions. The data sample used corresponds to an integrated luminosity of $6 \, {\rm fb}^{-1}$ collected at a center-of-mass energy of 13 TeV with the LHCb detector. In events with a $Z$ boson and a jet, the fraction of charm jets is determined in intervals of $Z$-boson rapidity in the range $2.0 < y(Z) < 4.5$. A sizable enhancement is observed in the forward-most $y(Z)$ interval, which could be indicative of a valence-like intrinsic-charm component in the proton wave function.

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arXiv2022

Searches for rare $B_s^0$ and $B^0$ decays into four muons

Searches for rare $B_s^0$ and $B^0$ decays into four muons are performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 9 $\text{fb}^{-1}$. Direct decays and decays via light scalar and $J/ψ$ resonances are considered. No evidence for the six decays searched for is found and upper limits at the 95% confidence level on their branching fractions ranging between $1.8\times10^{-10}$ and $2.6\times10^{-9}$ are set.

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arXiv2022

Search for $B^{0} \to K_S^{0}K_S^{0}γ$ decays at Belle

We report the first search for the penguin-dominated process $B^0 \rightarrow K_S^0 K_S^0 γ$ using the full data sample of $772\times 10^6$ $B\bar{B}$ pairs collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We do not observe any statistically significant signal yield in the $K_S^0$-pair invariant mass range 1 GeV/$c^2 < M_{K_S^0 K_S^0} < $ 3 GeV/$c^2$, and set the following upper limits at 90% confidence level: $\mathcal{B}(B^0 \to K_S^0 K_S^0 γ) < 5.8\times10^{-7}$, $\mathcal{B}(B^0 \to f_2 γ)\times \mathcal{B}(f_2 (1270) \to K_S^0 K_S^0 ) < 3.1\times10^{-7}$, and $\mathcal{B}(B^0 \to f_2^{\prime} γ)\times \mathcal{B}(f_2^{\prime} (1525) \to K_S^0 K_S^0 ) < 2.1\times10^{-7}$. Further, 90% confidence upper limits have also been set in the range of [0.7-2.9]$\times10^{-7}$ on the $B^0 \rightarrow K_S^0 K_S^0 γ$ branching fraction in bins of $M_{K_S^0 K_S^0}$.

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arXiv2022

Measurement of the lifetimes of promptly produced $Ω^{0}_{c}$ and $Ξ^{0}_{c}$ baryons

A measurement of the lifetimes of the $Ω^{0}_{c}$ and $Ξ^{0}_{c}$ baryons is reported using proton-proton collision data at a centre-of-mass energy of $13\text{ TeV}$, corresponding to an integrated luminosity of $5.4\text{ fb}^{-1}$ collected by the LHCb experiment. The $Ω^{0}_{c}$ and $Ξ^{0}_{c}$ baryons are produced directly from proton interactions and reconstructed in the $pK^{-}K^{-}π^{+}$ final state. The $Ω^{0}_{c}$ lifetime is measured to be $276.5\pm13.4\pm4.4\pm0.7\text{ fs}$, and the $Ξ^{0}_{c}$ lifetime is measured to be $148.0\pm2.3\pm2.2\pm0.2\text{ fs}$, where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the $D^{0}$ lifetime. These results confirm previous LHCb measurements based on semileptonic beauty-hadron decays, which disagree with earlier results of a four times shorter $Ω^{0}_{c}$ lifetime, and provide the single most precise measurement of the $Ω^{0}_{c}$ lifetime.

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