arXiv subjects

A. Baranov

Publications and source records attributed to A. Baranov.

At least 127 records · Page 7Linked to original sources

arXiv2018

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

The first measurement of the lifetime of the doubly charmed baryon $Ξ_{cc}^{++}$ is presented, with the signal reconstructed in the final state $Λ_c^+ K^- π^+ π^+$. The data sample used corresponds to an integrated luminosity of $1.7\,\mathrm{fb}^{-1}$, collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of $13\mathrm{\,Te\kern -0.1em V}$. The $Ξ_{cc}^{++}$ lifetime is measured to be $0.256\,^{+0.024}_{-0.022}{\,\rm (stat)\,} \pm 0.014 {\,\rm(syst)}\mathrm{\,ps}$.

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arXiv2018

Measurement of the $CP$ asymmetry in $B^-\to D_s^-D^0$ and $B^-\to D^-D^0$ decays

The $CP$ asymmetry in $B^-\to D_s^-D^0$ and $B^-\to D^-D^0$ decays is measured using LHCb data corresponding to an integrated luminosity of 3.0 fb$^{-1}$, collected in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV. The results are $A^{CP}(B^-\to D_s^-D^0)=(-0.4\pm 0.5\pm 0.5)\%$ and $A^{CP}(B^-\to D^-D^0)=( 2.3\pm 2.7\pm 0.4)\%$, where the first uncertainties are statistical and the second systematic. This is the first measurement of $A^{CP}(B^-\to D_s^-D^0)$ and the most precise determination of $A^{CP}(B^-\to D^-D^0)$. Neither result shows evidence of $CP$ violation.

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arXiv2018

Search for $B_c^+$ decays to two charm mesons

A search for decays of $B_c^+$ mesons to two charm mesons is performed for the first time using data corresponding to an integrated luminosity of 3.0 fb$^{-1}$, collected by the LHCb experiment in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV. The decays considered are $B_c^+\to D^{(*)+}_{(s)} \overline{D}^{(*)0}$ and $B_c^+\to D^{(*)+}_{(s)} D^{(*)0}$, which are normalised to high-yield $B^+\to D^+_{(s)} \overline{D}^0$ decays. No evidence for a signal is found and limits are set on twelve $B_c^+$ decay modes.

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arXiv2018

Measurement of the inelastic $pp$ cross-section at a centre-of-mass energy of 13\,TeV

The cross-section for inelastic proton-proton collisions at a centre-of-mass energy of 13\,TeV is measured with the LHCb detector. The fiducial cross-section for inelastic interactions producing at least one prompt long-lived charged particle with momentum $p>2$\,GeV/$c$ in the pseudorapidity range $2<η<5$ is determined to be $σ_{\rm acc}= 62.2 \pm 0.2 \pm 2.5$\,mb. The first uncertainty is the intrinsic systematic uncertainty of the measurement, the second is due to the uncertainty on the integrated luminosity. The statistical uncertainty is negligible. Extrapolation to full phase space yields the total inelastic proton-proton cross-section $σ_{\rm inel}= 75.4 \pm 3.0 \pm 4.5$\,mb, where the first uncertainty is experimental and the second due to the extrapolation. An updated value of the inelastic cross-section at a centre-of-mass energy of 7\,TeV is also reported.

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arXiv2018

Measurement of $CP$ violation in $B^{0}\rightarrow D^{\mp}π^{\pm}$ decays

A measurement of the $CP$ asymmetries $S_{f}$ and $S_{\bar{f}}$ in $B^0\to D^{\mp}π^{\pm}$ decays is reported. The decays are reconstructed in a dataset collected with the LHCb experiment in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV and corresponding to an integrated luminosity of $3.0 \rm{ fb}^{-1}$. The $CP$ asymmetries are measured to be $S_{f} = 0.058 \pm 0.020 (\rm{stat}) \pm 0.011(\rm{syst})$ and $S_{\bar{f}} = 0.038\pm 0.020 (\text{stat})\pm 0.007 (\text{syst})$. These results are in agreement with, and more precise than, previous determinations. They are used to constrain $|\sin\left(2β+γ\right)|$ and $γ$ to intervals that are consistent with the current world-average values.

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arXiv2018

Studies of the resonance structure in $D^{0} \to K^\mp π^\pm π^\pm π^\mp$ decays

Amplitude models are constructed to describe the resonance structure of ${D^{0}\to K^{-}π^{+}π^{+}π^{-}}$ and ${D^{0} \to K^{+}π^{-}π^{-}π^{+}}$ decays using $pp$ collision data collected at centre-of-mass energies of 7 and 8 TeV with the LHCb experiment, corresponding to an integrated luminosity of $3.0\mathrm{fb}^{-1}$. The largest contributions to both decay amplitudes are found to come from axial resonances, with decay modes $D^{0} \to a_1(1260)^{+} K^{-}$ and $D^{0} \to K_1(1270/1400)^{+} π^{-}$ being prominent in ${D^{0}\to K^{-}π^{+}π^{+}π^{-}}$ and $D^{0}\to K^{+}π^{-}π^{-}π^{+}$, respectively. Precise measurements of the lineshape parameters and couplings of the $a_1(1260)^{+}$, $K_1(1270)^{-}$ and $K(1460)^{-}$ resonances are made, and a quasi model-independent study of the $K(1460)^{-}$ resonance is performed. The coherence factor of the decays is calculated from the amplitude models to be $R_{K3π} = 0.459\pm 0.010\,(\mathrm{stat}) \pm 0.012\,(\mathrm{syst}) \pm 0.020\,(\mathrm{model})$, which is consistent with direct measurements. These models will be useful in future measurements of the unitary-triangle angle $γ$ and studies of charm mixing and $C\!P$ violation.

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arXiv2018

Evidence for the rare decay $Σ^+ \to p μ^+ μ^-$

A search for the rare decay $Σ^+ \to p μ^+ μ^-$ is performed using $pp$ collision data recorded by the LHCb experiment at centre-of-mass energies $\sqrt{s} = 7$ and $8$ TeV, corresponding to an integrated luminosity of $3 fb^{-1}$. An excess of events is observed with respect to the background expectation, with a signal significance of 4.1 standard deviations. No significant structure is observed in the dimuon invariant mass distribution, in contrast with a previous result from the HyperCP experiment. The measured $Σ^+ \to p μ^+ μ^-$ branching fraction is $(2.2\,^{+\,1.8}_{-\,1.3})\times 10^{-8}$, where statistical and systematic uncertainties are included, which is consistent with the Standard Model prediction.

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arXiv2018

Search for the rare decay $Λ_{c}^{+} \to pμ^+μ^-$

A search for the flavor-changing neutral-current decay $Λ_{c}^{+} \to pμ^+μ^-$ is reported using a data set corresponding to an integrated luminosity of $3.0\rm fb^{-1}$ collected by the LHCb collaboration. No significant signal is observed outside of the dimuon mass regions around the $ϕ$ and $ω$ resonances and an upper limit is placed on the branching fraction of $\mathcal{B} (Λ_{c}^{+} \to pμ^+μ^-) < 7.7~(9.6)\times 10^{-8}~{\rm at}~90\%~(95\%)$ confidence level. A significant signal is observed in the $ω$ dimuon mass region for the first time.

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arXiv2018

Test of Lepton Flavor Universality by the measurement of the $B^0 \to D^{*-} τ^+ ν_τ$ branching fraction using three-prong $τ$ decays

The ratio of branching fractions ${\cal{R}}(D^{*-})\equiv {\cal{B}}(B^0 \to D^{*-} τ^+ ν_τ)/{\cal{B}}(B^0 \to D^{*-} μ^+ν_μ)$ is measured using a data sample of proton-proton collisions collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3$~$fb$^{-1}$. The $τ$ lepton is reconstructed with three charged pions in the final state. A novel method is used that exploits the different vertex topologies of signal and backgrounds to isolate samples of semitauonic decays of $b$ hadrons with high purity. Using the $B^0 \to D^{*-}π^+π^-π^+$ decay as the normalization channel, the ratio ${\cal{B}}(B^0 \to D^{*-} τ^+ ν_τ)/{\cal{B}}(B^0 \to D^{*-}π^+π^-π^+)$ is measured to be $1.97 \pm 0.13 \pm 0.18$, where the first uncertainty is statistical and the second systematic. An average of branching fraction measurements for the normalization channel is used to derive ${\cal{B}}(B^0 \to D^{*-} τ^+ ν_τ) = (1.42 \pm 0.094 \pm 0.129 \pm 0.054) \%$, where the third uncertainty is due to the limited knowledge of ${\cal{B}}(B^0\to D^{*-}π^+π^-π^+)$. A test of lepton flavor universality is performed using the well-measured branching fraction ${\cal{B}}(B^0 \to D^{*-} μ^+ν_μ)$ to compute ${\cal{R}}(D^{*-}) = 0.291 \pm 0.019 \pm 0.026 \pm 0.013$, where the third uncertainty originates from the uncertainties on ${\cal{B}}(B^0 \to D^{*-}π^+π^-π^+)$ and ${\cal{B}}(B^0 \to D^{*-} μ^+ν_μ)$. This measurement is in agreement with the Standard Model prediction and with previous measurements.

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arXiv2018

Measurement of the ratio of the $B^0 \to D^{-} τ^+ ν_τ$ and $B^0 \to D^{-} μ^+ ν_μ$ branching fractions using three-prong $τ$-lepton decays

The ratio of branching fractions ${\cal{R}}(D^{*-})\equiv {\cal{B}}(B^0 \to D^{*-} τ^+ ν_τ)/{\cal{B}}(B^0 \to D^{*-} μ^+ν_μ)$ is measured using a data sample of proton-proton collisions collected with the LHCb detector at center-of-mass energies of 7 and 8 Tev, corresponding to an integrated luminosity of 3$~$fb$^{-1}$. For the first time ${\cal{R}}(D^{*-})$ is determined using the $τ$ lepton decays with three charged pions in the final state. The $B^0 \to D^{*-} τ^+ν_τ$ yield is normalized to that of the $B^0\to D^{*-} π^+π^-π^+$ mode, providing a measurement of ${\cal{B}}(B^0\to D^{*-}τ^+ν_τ)/{\cal{B}}(B^0\to D^{*-}π^+π^-π^+) = 1.97 \pm 0.13 \pm 0.18$, where the first uncertainty is statistical and the second systematic. The value of ${\cal{B}}(B^0 \to D^{*-} τ^+ ν_τ) = (1.42 \pm 0.094 \pm 0.129 \pm 0.054)\% $ is obtained, where the third uncertainty is due to the limited knowledge of the branching fraction of the normalization mode. Using the well-measured branching fraction of the $B^0 \to D^{*-} μ^+ν_μ$ decay, a value of ${\cal{R}}(D^{*-}) = 0.291 \pm 0.019 \pm 0.026 \pm 0.013$ is established, where the third uncertainty is due to the limited knowledge of the branching fractions of the normalization and $B^0\to D^{*-}μ^+ν_μ$ modes. This measurement is in agreement with the Standard Model prediction and with previous results.

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arXiv2018

Measurements of the branching fractions of $Λ_{c}^{+} \rightarrow p π^{-} π^{+}$, $Λ_{c}^{+} \rightarrow p K^{-} K^{+}$, and $Λ_{c}^{+} \rightarrow p π^{-} K^{+}$

The ratios of the branching fractions of the decays $Λ_{c}^{+} \rightarrow p π^{-} π^{+}$, $Λ_{c}^{+} \rightarrow p K^{-} K^{+}$, and $Λ_{c}^{+} \rightarrow p π^{-} K^{+}$ with respect to the Cabibbo-favoured $Λ_{c}^{+} \rightarrow p K^{-} π^{+}$ decay are measured using proton-proton collision data collected with the LHCb experiment at a 7 TeV centre-of-mass energy and corresponding to an integrated luminosity of 1.0 fb$^{-1}$: \begin{align*} \frac{\mathcal{B}(Λ_{c}^{+} \rightarrow p π^{-} π^{+})}{\mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} π^{+})} & = (7.44 \pm 0.08 \pm 0.18)\,\%, \frac{\mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} K^{+})}{\mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} π^{+})} &= (1.70 \pm 0.03 \pm 0.03)\,\%, \frac{\mathcal{B}(Λ_{c}^{+} \rightarrow p π^{-} K^{+})}{\mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} π^{+})} & = (0.165 \pm 0.015 \pm 0.005 )\,\%, \end{align*} where the uncertainties are statistical and systematic, respectively. These results are the most precise measurements of these quantities to date. When multiplied by the world-average value for $\mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} π^{+})$, the corresponding branching fractions are \begin{align*} \mathcal{B}(Λ_{c}^{+} \rightarrow p π^{-} π^{+}) &= (4.72 \pm 0.05 \pm 0.11 \pm 0.25) \times 10^{-3}, \mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} K^{+}) &= (1.08 \pm 0.02 \pm 0.02 \pm 0.06) \times 10^{-3}, \mathcal{B}(Λ_{c}^{+} \rightarrow p π^{-} K^{+}) &= (1.04 \pm 0.09 \pm 0.03 \pm 0.05) \times 10^{-4}, \end{align*} where the final uncertainty is due to $\mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} π^{+})$.

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arXiv2018

A measurement of the $CP$ asymmetry difference in $\varLambda_{c}^{+} \to pK^{-}K^{+}$ and $pπ^{-}π^{+}$ decays

The difference between the $CP$ asymmetries in the decays $\varLambda_{c}^{+} \to pK^{-}K^{+}$ and $\varLambda_{c}^{+} \to pπ^{-}π^{+}$ is presented. Proton-proton collision data taken at centre-of-mass energies of $7$ and $8\,\mathrm{TeV}$ collected by the LHCb detector in 2011 and 2012 are used, corresponding to an integrated luminosity of $3\,\mathrm{fb}^{-1}$. The $\varLambda_{c}^{+}$ candidates are reconstructed as part of the $\varLambda_{b}^{0} \to \varLambda_{c}^{+}μ^{-}X$ decay chain. In order to maximize the cancellation of production and detection asymmetries in the difference, the final-state kinematic distributions of the two samples are aligned by applying phase-space-dependent weights to the $\varLambda_{c}^{+} \to pπ^{-}π^{+}$ sample. This alters the definition of the integrated $CP$ asymmetry to $A_{CP}^{\text{wgt}}(pπ^{-}π^{+})$. Both samples are corrected for reconstruction and selection efficiencies across the five-dimensional $\varLambda_{c}^{+}$ decay phase space. The difference in $CP$ asymmetries is found to be \begin{align*} Δ{A^{\text{wgt}}_{CP}} &= A_{CP}(pK^{-}K^{+}) - A_{CP}^{\text{wgt}}(pπ^{-}π^{+})\\ &= (0.30 \pm 0.91 \pm 0.61)\,\%, \end{align*} where the first uncertainty is statistical and the second is systematic.

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arXiv2018

Measurement of $CP$ observables in $B^{\pm} \rightarrow D K^{*\pm}$ decays using two- and four-body $D$ final states

Measurements of $CP$ observables in $B^{\pm} \rightarrow D K^{*\pm}$ decays are presented, where $D$ denotes a superposition of $D^0$ and $\overline{D^0}$ meson states. Decays of the $D$ meson to $K^{-}π^{+}$, $K^{-}K^{+}$, $π^{-}π^{+}$, $K^{-}π^{+}π^{-}π^{+}$ and $π^{-}π^{+}π^{-}π^{+}$ are used and the $K^{*\pm}$ meson is reconstructed in the $K^{0}_{\mathrm{S}}π^{\pm}$ final state. This analysis uses a data sample of $pp$ collisions collected with the LHCb experiment, corresponding to integrated luminosities of 1 $\mathrm{fb}^{-1}$, 2 $\mathrm{fb}^{-1}$ and 1.8 $\mathrm{fb}^{-1}$ at centre-of-mass energies $\sqrt{s} = $ 7 TeV, 8 TeV and 13 TeV, respectively. The sensitivity of the results to the CKM angle $γ$ is discussed.

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arXiv2018

First measurement of the $CP$-violating phase $ϕ_s^{d\overline{d}}$ in $B_s^0\to(K^+π^-)(K^-π^+)$ decays

A flavour-tagged decay-time-dependent amplitude analysis of $B_s^0\to(K^+π^-)(K^-π^+)$ decays is presented in the $K^{\pm}π^{\mp}$ mass range from 750 to 1600 MeV$/c^2$. The analysis uses $pp$ collision data collected with the LHCb detector at centre-of-mass energies of $7$ and $8$ TeV, corresponding to an integrated luminosity of $3.0$ fb$^{-1}$. Several quasi-two-body decay modes are considered, corresponding to $K^{\pm}π^{\mp}$ combinations with spin 0, 1 and 2, which are dominated by the $K_0^*(800)^0$ and $K_0^*(1430)^0$, the $K^*(892)^0$ and the $K_2^*(1430)^0$ resonances, respectively. The longitudinal polarisation fraction for the $B_s^0\to K^*(892)^0\overline{K}^*(892)^0$ decay is measured as $f_L=0.208 \pm 0.032 \pm 0.046$, where the first uncertainty is statistical and the second is systematic. The first measurement of the mixing-induced $CP$-violating phase, $ϕ_s^{d\overline{d}}$, in $b\to d\overline{d}s$ transitions is performed, yielding a value of $ϕ_s^{d\overline{d}}=-0.10$ $\pm$ $0.13$ (stat) $\pm$ $0.14$ (syst) rad.

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arXiv2018

Search for the lepton-flavour violating decays $B^0_{(s)} \rightarrow e^\pm μ^\mp$

A search for the lepton-flavour violating decays $B^0_s \rightarrow e^\pm μ^\mp$ and $B^0 \rightarrow e^\pm μ^\mp$ is performed based on a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb$^{-1}$, collected with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The observed yields are consistent with the background-only hypothesis. Upper limits on the branching fractions are determined to be $\mathcal{B}(B^0_s \rightarrow e^\pm μ^\mp) < 5.4\,(6.3) \times 10^{-9}$ and $\mathcal{B}(B^0 \rightarrow e^\pm μ^\mp) < 1.0\,(1.3) \times 10^{-9}$ at $90\%\,(95\%)$ confidence level, which are the strongest limits on these decays to date.

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arXiv2018

Measurement of the ratio of branching fractions $\mathcal{B}(B_c^+\,\to\,J/ψτ^+ν_τ)$/$\mathcal{B}(B_c^+\,\to\,J/ψμ^+ν_μ)$

A measurement is reported of the ratio of branching fractions $\mathcal{R}(J/ψ)=\mathcal{B}(B_c^+\,\to\,J/ψτ^+ν_τ)/\mathcal{B}(B_c^+\,\to\,J/ψμ^+ν_μ)$, where the $τ^+$ lepton is identified in the decay mode $τ^+\,\to\,μ^+ν_μ\overlineν_τ$. This analysis uses a sample of proton-proton collision data corresponding to 3.0$\mathrm{\,fb}^{-1}$ of integrated luminosity recorded with the LHCb experiment at center-of-mass energies $7\,\mathrm{TeV}$ and $8\,\mathrm{TeV}$. A signal is found for the decay $B_c^+\,\to\,J/ψτ^+ν_τ$ at a significance of 3 standard deviations, corrected for systematic uncertainty, and the ratio of the branching fractions is measured to be $\mathcal{R}(J/ψ) = 0.71 \pm 0.17 \mathrm{\,(stat)} \pm 0.18\mathrm{\,(syst)}$. This result lies within 2 standard deviations above the range of existing predictions in the Standard Model.

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arXiv2018

Measurement of $CP$ asymmetry in $B_s^0 \to D_s^{\mp} K^{\pm}$ decays

We report the measurements of the $CP$-violating parameters in $B_s^0 \to D_s^{\mp} K^{\pm}$ decays observed in $pp$ collisions, using a data set corresponding to an integrated luminosity of $3.0\,\text{fb}^{-1}$ recorded with the LHCb detector. We measure $C_f = 0.73 \pm 0.14 \pm 0.05$, $A^{ΔΓ}_f = 0.39 \pm 0.28 \pm 0.15$, $A^{ΔΓ}_{\overline{f}} = 0.31 \pm 0.28 \pm 0.15$, $S_f = -0.52 \pm 0.20 \pm 0.07$, $S_{\overline{f}} = -0.49 \pm 0.20 \pm 0.07$, where the uncertainties are statistical and systematic, respectively. These parameters are used together with the world-average value of the $B_s^0$ mixing phase, $-2β_s$, to obtain a measurement of the CKM angle $γ$ from $B_s^0 \to D_s^{\mp} K^{\pm}$ decays, yielding $γ= (128\,_{-22}^{+17})^\circ$ modulo $180^\circ$, where the uncertainty contains both statistical and systematic contributions. This corresponds to $3.8\,σ$ evidence for $CP$ violation in the interference between decay and decay after mixing.

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arXiv2018

Measurement of the shape of the $Λ_b^0\toΛ_c^+ μ^- \overlineν$ differential decay rate

A measurement of the shape of the differential decay rate and the associated Isgur-Wise function for the decay $Λ_b^0\toΛ_c^+μ^-\overlineν$ is reported, using data corresponding to $3 fb^{-1}$ collected with the LHCb detector in proton-proton collisions. The $Λ_c^+μ^-\overlineν$(+ anything) final states are reconstructed through the detection of a muon and a $Λ_c^+$ baryon decaying into $pK^-π^+$, and the decays $Λ_b^0\toΛ_c^+π^+π^-μ^-\overlineν$ are used to determine contributions from $Λ_b^0\to Λ_c^{\star+}μ^-\barν$ decays. The measured dependence of the differential decay rate upon the squared four-momentum transfer between the heavy baryons, $q^2$, is compared with expectations from heavy-quark effective theory and from unquenched lattice QCD predictions.

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