arXiv subjects

J. A. Boelhauve

Publications and source records attributed to J. A. Boelhauve.

At least 37 records · Page 2Linked to original sources

arXiv2025

Measurement of the branching fraction ratios $R(D^{+})$ and $R(D^{*+})$ using muonic $τ$ decays

The branching fraction ratios of $\overline{B}^0\to D^+τ^-\overlineν_τ$ and $\overline{B}^0\to D^{*+}τ^-\overlineν_τ$ decays are measured with respect to their muonic counterparts, using a data sample corresponding to an integrated luminosity of 2.0 fb$^{-1}$ collected by the LHCb experiment in proton-proton collisions at $\sqrt{s} = 13$ TeV. The reconstructed final states are formed by combining $D^+$ mesons with $τ^-\toμ^-\overlineν_μν_τ$ candidates, where the $D^+$ is reconstructed via the $D^+\to K^-π^+π^+$ decay. The results are \begin{align*} R(D^{+}) &= 0.249 \pm 0.043 \pm 0.047, R(D^{*+}) &= 0.402 \pm 0.081\pm 0.085, \end{align*} where the first uncertainties are statistical and the second systematic. The two measurements have a correlation coefficient of $-0.39$ and are compatible with the Standard Model.

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arXiv2025

Study of charmonium production via the decay to $p\bar{p}$ at $\sqrt{s} = 13 TeV$

Charmonium production cross-section in proton-proton collisions is measured at the centre-of-mass energy $\sqrt{s}=13\,TeV$ using decays to $p\bar{p}$ final state. The study is performed using a data sample corresponding to an integrated luminosity of $2.2\,{fb}^{-1}$ collected in 2018 with the $LHCb$ detector. The production cross-section of the $η_c$ meson is measured in a rapidity range of $2.0 < y < 4.0$ and in a transverse momentum range of $5.0 < p_{T} < 20.0\,{GeV/\it{c}}$, which is extended compared with previous $LHCb$ analyses. The differential cross-section is measured in bins of $p_{T}$ and, for the first time, of $y$. Upper limits, at 90% and 95% confidence levels, on the $η_c(2S)$ and $h_c(1P)$ prompt production cross-sections are determined for the first time.

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arXiv2025

Measurement of $D^0-\overline{D}^0$ mixing and search for $CP$ violation with $D^0\rightarrow K^+π^-$ decays

A measurement of the time-dependent ratio of the $D^0\rightarrow K^+π^-$ to $\overline{D}^0\rightarrow K^+π^-$ decay rates is reported. The analysis uses a sample of proton-proton collisions corresponding to an integrated luminosity of 6 fb$^{-1}$ recorded by the LHCb experiment from 2015 through 2018 at a center-of-mass energy of 13 TeV. The $D^0$ meson is required to originate from a $D^{*+}\rightarrow D^0π^+$ decay, such that its flavor at production is inferred from the charge of the accompanying pion. The measurement is performed simultaneously for the $K^+π^-$ and $K^-π^+$ final states, allowing both mixing and $CP$-violation parameters to be determined. The value of the ratio of the decay rates at production is determined to be $R_{Kπ} = (343.1 \pm 2.0) \times 10^{-5}$. The mixing parameters are measured to be $c_{Kπ} = (51.4 \pm 3.5) \times 10^{-4}$ and $c_{Kπ}^{\prime} = (13 \pm 4) \times 10^{-6}$, where $\sqrt{R_{Kπ}}c_{Kπ}$ is the linear coefficient of the expansion of the ratio as a function of decay time in units of the $D^0$ lifetime, and $c_{Kπ}^{\prime}$ is the quadratic coefficient, both averaged between the $K^+π^-$ and $K^-π^+$ final states. The precision is improved relative to the previous best measurement by approximately 60%. No evidence for $CP$ violation is found.

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arXiv2024

Search for the lepton-flavor violating decay $B^0_s\toϕμ^\pmτ^\mp$

A search for the lepton-flavor violating decays $B^0_s\toϕμ^\pmτ^\mp$ is presented, using a sample of proton-proton collisions at center-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of $9\,\text{fb}^{-1}$. The $τ$ leptons are selected using decays with three charged pions. No significant excess is observed, and an upper limit on the branching fraction is determined to be ${\cal B}( B^0_s\toϕμ^\pmτ^\mp) < 1.0\times 10^{-5}$ at 90% confidence level.

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arXiv2024

Transverse polarization measurement of $Λ$ hyperons in $p$Ne collisions at $\sqrt{s_{NN}}$ = 68.4 GeV with the $\mbox{LHCb}$ detector

A measurement of the transverse polarization of the $Λ$ and $\barΛ$ hyperons in $p$Ne fixed-target collisions at $\sqrt{s_{NN}}$ = 68.4 GeV is presented using data collected by the LHCb detector. The polarization is studied using the decay $Λ\rightarrow p π^-$ together with its charge conjugated process, the integrated values measured are $$ P_Λ = 0.029 \pm 0.019 \, (\rm{stat}) \pm 0.012 \, (\rm{syst}) \, , $$ $$ P_{\barΛ} = 0.003 \pm 0.023 \, (\rm{stat}) \pm 0.014 \,(\rm{syst}) \,. $$ Furthermore, the results are shown as a function of the Feynman~$x$~variable, transverse momentum, pseudorapidity and rapidity of the hyperons, and are compared with previous measurements.

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arXiv2024

Precision measurement of the $Ξ^-_b$ baryon lifetime

A sample of $pp$ collision data, corresponding to an integrated luminosity of 5.5 fb$^{-1}$ and collected by the LHCb experiment during LHC Run 2, is used to measure the ratio of the lifetime of the $Ξ^-_b$ baryon to that of the $Λ^0_b$ baryon, $r_τ\equivτ_{Ξ^-_b}/τ_{Λ^0_b}$. The value ${r_τ=1.076\pm0.013\pm0.006}$ is obtained, where the first uncertainty is statistical and the second systematic. This value is averaged with the corresponding value from Run 1 to obtain ${r_τ^{\rm Run\,1,2} = 1.078\pm0.012\pm0.007}$. Multiplying by the world-average value of the $Λ^0_b$ lifetime yields $τ_{Ξ^-_b}^{\rm Run~1,2} = 1.578\pm0.018\pm0.010\pm0.011$ ps, where the uncertainties are statistical, systematic, and due to the limited knowledge of the $Λ^0_b$ lifetime. This measurement improves the precision of the current world average of the $Ξ^-_b$ lifetime by about a factor of two, and is in good agreement with the most recent theoretical predictions.

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arXiv2024

Study of $b$-hadron decays to $\mathitΛ_{c}^+ h^- h^{\prime -}$ final states

Decays of $\mathitΞ_{b}^-$ and $\mathitΩ_{b}^-$ baryons to $\mathitΛ_{c}^+ h^- h^{\prime -}$ final states, with $h^- h^{\prime -}$ being $π^-π^-$, $K^-π^-$ and $K^-K^-$ meson pairs, are searched for using data collected with the LHCb detector. The data sample studied corresponds to an integrated luminosity of $8.7\,\mathrm{fb}^{-1}$ of $pp$ collisions collected at centre-of-mass energies $\sqrt{s} = 7$, $8$ and $13\,\mathrm{Te\kern -0.1em V}$. The products of the relative branching fractions and fragmentation fractions for each signal mode, relative to the $B^- \to \mathitΛ_{c}^+ \overline{p} π^-$ mode, are measured, with $\mathitΞ_{b}^- \to\mathitΛ_{c}^+ K^- π^-$, $\mathitΞ_{b}^- \to\mathitΛ_{c}^+ K^- K^-$ and $\mathitΩ_{b}^- \to\mathitΛ_{c}^+ K^- K^-$ decays being observed at over $5\,σ$ significance. The $\mathitΞ_{b}^- \to\mathitΛ_{c}^+ K^- π^-$ mode is also used to measure the $\mathitΞ_{b}^-$ production asymmetry, which is found to be consistent with zero. In addition, the $B^- \to \mathitΛ_{c}^+ \overline{p} K^-$ decay is observed for the first time, and its branching fraction is measured relative to that of the $B^- \to \mathitΛ_{c}^+ \overline{p} π^-$ mode.

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arXiv2024

Search for the rare decay of charmed baryon $Λ_c^+$ into $p μ^+ μ^-$ final state

A search for the nonresonant $Λ_c^+ \to p μ^+ μ^-$ decay is performed using proton-proton collision data recorded at a centre-of-mass energy of 13 TeV by the LHCb experiment, corresponding to an integrated luminosity of 5.4 fb$^{-1}$. No evidence for the decay is found in the dimuon invariant-mass regions where the expected contributions of resonances is subdominant. The upper limit on the branching fraction of the $Λ_c^+ \to p μ^+ μ^-$ decay is determined to be $2.9~(3.2) \times 10^{-8}$ at 90% (95%) confidence level. The branching fractions in the dimuon invariant-mass regions dominated by the $η$, $ρ$ and $ω$ resonances are also determined.

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arXiv2024

Measurement of the mass difference and relative production rate of the $Ω^-_b$ and $Ξ^-_b$ baryons

The mass difference between the $Ω^-_b$ and $Ξ^-_b$ baryons is measured using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9 \, \text{fb}^{-1}$, and is found to be \begin{equation} m(Ω^-_b)- m(Ξ^-_b) = 248.54 \pm 0.51 \text{(stat)} \pm 0.38 \text{(syst)} \, \text{MeV}/c^2. \end{equation} The mass of the $Ω^-_b$ baryon is measured to be \begin{equation} m(Ω^-_b)= 6045.9 \pm 0.5 \text{(stat)} \pm 0.6 \text{(syst)} \, \text{MeV}/c^2. \end{equation} This is the most precise determination of the $Ω^-_b$ mass to date. In addition, the production rate of $Ω^-_b$ baryons relative to that of $Ξ^-_b$ baryons is measured for the first time in $pp$ collisions, using an LHCb dataset collected at a center-of-mass energy of $13 \, \text{TeV}$ and corresponding to an integrated luminosity of $6\,\text{fb}^{-1}$. Reconstructing beauty baryons in the kinematic region $2 < η< 6$ and $p_T < 20\,\text{GeV}/c$ with their decays to a $J/ψ$ meson and a hyperon, the ratio \begin{equation} \frac{f_{Ω^-_b}}{f_{Ξ^-_b}}\times\frac{\mathcal{B}(Ω^-_b \to J/ψΩ^-)}{\mathcal{B}(Ξ^-_b \to J/ψΞ^-)} = 0.120 \pm 0.008 \text{(stat)} \pm 0.008 \text{(syst)}, \end{equation} is obtained, where $f_{Ω^-_b}$ and $f_{Ξ^-_b}$ are the fragmentation fractions of $b$ quarks into $Ω^-_b$ and $Ξ^-_b$ baryons, respectively, and $\mathcal{B}$ represents the branching fractions of their respective decays.

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arXiv2024

Test of lepton flavour universality using $B^0 \to D^{*-}τ^+ν_τ$ decays with hadronic $τ$ channels

The branching fraction $\mathcal{B}(B^0 \to D^{*-}τ^+ν_τ)$ is measured relative to that of the normalization mode $B^0 \to D^{*-}π^+π^-π^+$ using hadronic $τ^+ \to π^+π^-π^+(π^0)\overlineν_τ$ decays in proton-proton collision data at a center-of-mass energy of 13 TeV collected by the LHCb experiment, corresponding to an integrated luminosity of 2 fb$^{-1}$. The measured ratio is $\mathcal{B}(B^0 \to D^{*-}τ^+ν_τ)/\mathcal{B}(B^0 \to D^{*-}π^+π^-π^+) = 1.79 \pm 0.11 \pm 0.11$, where the first uncertainty is statistical and the second is related to systematic effects. Using established branching fractions for the $B^0 \to D^{*-}π^+π^-π^+$ and $B^0 \to D^{*-}μ^+ν_μ$ modes, the lepton universality test, $\mathcal{R}(D^{*-}) \equiv \mathcal{B}(B^0 \to D^{*-}τ^+ν_τ)/\mathcal{B}(B^0 \to D^{*-}μ^+ν_μ)$ is calculated, $$ \mathcal{R}(D^{*-}) = 0.260 \pm 0.015 \pm 0.016 \pm 0.012\, , $$ where the third uncertainty is due to the uncertainties on the external branching fractions. This result is consistent with the Standard Model prediction and with previous measurements.

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arXiv2024

Study of coherent $J/ψ$ production in lead-lead collisions at $\sqrt{s_{NN}} = 5 TeV$

Coherent production of $J/ψ$ mesons is studied in ultraperipheral lead-lead collisions at a nucleon-nucleon centre-of-mass energy of 5 TeV, using a data sample collected by the LHCb experiment corresponding to an integrated luminosity of about $10 μb^{-1}$. The $J/ψ$ mesons are reconstructed in the dimuon final state and are required to have transverse momentum below 1 GeV. The cross-section within the rapidity range of $2.0 < y < 4.5$ is measured to be $4.45\pm0.24\pm0.18\pm0.58$ mb, where the first uncertainty is statistical, the second systematic and the third originates from the luminosity determination. The cross-section is also measured in $J/ψ$ rapidity intervals. The results are compared to predictions from phenomenological models.

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arXiv2024

A search for rare $B \rightarrow D μ^+ μ^-$ decays

A search for rare $B \rightarrow D μ^+ μ^-$ decays is performed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb$^{-1}$. No significant signals are observed in the non-resonant $μ^+μ^-$ modes, and upper limits of $\mathcal{B}(B^0 \rightarrow \overline{D}^0 μ^+ μ^-) < 5.1 \times 10^{-8}$, $\mathcal{B}(B^+ \rightarrow D_s^+ μ^+ μ^-) < 3.2 \times 10^{-8}$, $\mathcal{B}(B_s^0 \rightarrow \overline{D}^0 μ^+ μ^-) < 1.6 \times 10^{-7}$ and $f_c/f_u \cdot \mathcal{B}(B_c^+ \rightarrow D_s^+ μ^+ μ^-) < 9.6 \times 10^{-8}$ are set at the 95\% confidence level, where $f_c$ and $f_u$ are the fragmentation fractions of a $B$ meson with a $c$ and $u$ quark respectively in proton-proton collisions. Each result is either the first such measurement or an improvement by three orders of magnitude on an existing limit. Separate upper limits are calculated when the muon pair originates from a $J/ψ\rightarrow μ^+ μ^-$ decay. The branching fraction of $B_c^+ \rightarrow D_s^+ J/ψ$ multiplied by the fragmentation-fraction ratio is measured to be $f_c/f_u \cdot \mathcal{B}(B_c^+ \rightarrow D_s^+ J/ψ) = (1.63 \pm 0.15 \pm 0.13) \times 10^{-5}$, where the first uncertainty is statistical and the second systematic.

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arXiv2024

Open charm production and asymmetry in $p$Ne collisions at $\sqrt{s_{\scriptscriptstyle\rm NN}} =$ 68.5 GeV

A measurement of $D^0$ meson production by the LHCb experiment in its fixed-target configuration is presented. The production of $D^0$ mesons is studied with a beam of 2.5 TeV protons colliding on a gaseous neon target at rest, corresponding to a nucleon-nucleon centre-of-mass energy of $\sqrt{s_{\rm NN}}$ = 68.5 GeV. The sum of the $D^0$ and ${\overline D^0}$ production cross-section in $p$Ne collisions in the centre-of-mass rapidity range $y^{\star}\in [-2.29, 0]$ is found to be $σ_{D^{0}}^{y^\star \in [-2.29, 0]} = 48.2 \pm 0.3 \pm 4.5 \,μ\textrm{b/nucleon}$ where the first uncertainty is statistical and the second is systematic. The $D^0-{\overline D^0}$ production asymmetry is also evaluated and suggests a trend towards negative values at large negative $y^{\star}$. The considered models do not account precisely for all the features observed in the LHCb data, but theoretical predictions including 1$\%$ intrinsic charm and 10$\%$ recombination contributions better describe the data than the other models considered.

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arXiv2023

Observation of the $B^0_s\rightarrow χ_{c1}(3872)π^+π^-$ decay

The first observation of the $B^0_s \rightarrow \left( χ_{c1}(3872) \rightarrow J/ψπ^+π^-\right) π^+ π^-$ decay is reported using proton-proton collision data, corresponding to integrated luminosities of 1, 2 and 6fb$^{-1}$, collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13TeV, respectively. The ratio of branching fractions relative to the $B^0_s \rightarrow \left( ψ(2S) \rightarrow Jψπ^+π^- \right) π^+ π^-$ decay is measured to be $$ \frac{ \mathcal{B} \left( B^0_s \rightarrow χ_{c1}(3872) π^+π^-\right) \times \mathcal{B} \left( χ_{c1}(3872) \rightarrow Jψπ^+π^-\right)} { \mathcal{B} \left( B^0_s \rightarrow ψ(2S) π^+ π^- \right) \times \mathcal{B} \left( ψ(2S) \rightarrow Jψπ^+π^-\right) } = \left( 6.8 \pm 1.1 \pm 0.2 \right) \times 10^{-2} , $$ where the first uncertainty is statistical and the second systematic. The mass spectrum of the $π^+π^-$ system recoiling against the $χ_{c1}(3872)$ meson exhibits a large contribution from $B^0_s \rightarrow χ_{c1}(3872) \left( f_0(980) \rightarrow π^+ π^-\right)$ decays.

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arXiv2023

Observation of the $B^+ \rightarrow J/ψη^{\prime} K^+$ decay

The $B^+ \rightarrow J/ψη^{\prime} K^+$ decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13TeV, corresponding to a total integrated luminosity of 9fb$^{-1}$. The branching fraction of this decay is measured relative to the known branching fraction of the $B^+ \rightarrow ψ(2S) K^+$ decays and found to be $$ \frac{\mathcal{B}( B^+ \rightarrow J/ψη^{\prime}K^+)}{\mathcal{B}( B^+ \rightarrow ψ(2S)K^+)} = \left(4.91\pm 0.47\pm0.29\pm0.07\right)\times10^{-2}, $$ where the first uncertainty is statistical, the second is systematic and the third is related to external branching fractions. A first look at the $J/ψη^{\prime}$ mass distribution is performed and no signal of intermediate resonances is observed.

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arXiv2023

Measurement of lepton universality parameters in $B^+\to K^+\ell^+\ell^-$ and $B^0\to K^{*0}\ell^+\ell^-$ decays

A simultaneous analysis of the $B^+\to K^+\ell^+\ell^-$ and $B^0\to K^{*0}\ell^+\ell^-$ decays is performed to test muon-electron universality in two ranges of the square of the dilepton invariant mass, $q^2$. The measurement uses a sample of beauty meson decays produced in proton-proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of $9$ $\text{fb}^{-1}$. A sequence of multivariate selections and strict particle identification requirements produce a higher signal purity and a better statistical sensitivity per unit luminosity than previous LHCb lepton universality tests using the same decay modes. Residual backgrounds due to misidentified hadronic decays are studied using data and included in the fit model. Each of the four lepton universality measurements reported is either the first in the given $q^2$ interval or supersedes previous LHCb measurements. The results are compatible with the predictions of the Standard Model.

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arXiv2023

First observation of the $B^+ \rightarrow D_s^+ D_s^- K^+$ decay

The $B^+ \rightarrow D_s^+ D_s^- K^+$ decay is observed for the first time using proton-proton collision data collected by the LHCb detector at centre-of-mass energies of $7$, $8$ and $13\, \text{TeV}$, corresponding to an integrated luminosity of $9\,\text{fb}^{-1}$. Its branching fraction relative to that of the $B^{+} \rightarrow D^{+} D^{-} K^{+}$ decay is measured to be $$\frac{B\left(B^{+} \rightarrow D_s^{+} D_s^{-} K^{+}\right)}{B\left(B^{+} \rightarrow D^{+} D^{-} K^{+}\right)}=0.525 \pm 0.033 \pm 0.027 \pm 0.034,$$ where the first uncertainty is statistical, the second systematic, and the third is due to the uncertainties on the branching fractions of the $D_s^{\pm} \rightarrow K^{\mp} K^{\pm} π^{\pm}$ and $D^{\pm} \rightarrow K^{\mp} π^{\pm} π^{\pm}$ decays. This measurement fills an experimental gap in the knowledge of the family of Cabibbo$-$favoured $\bar{b} \rightarrow \bar{c} c \bar{s}$ transitions and opens the path for unique studies of spectroscopy in future.

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arXiv2023

Test of lepton universality in $b \rightarrow s \ell^+ \ell^-$ decays

The first simultaneous test of muon-electron universality using $B^{+}\rightarrow K^{+}\ell^{+}\ell^{-}$ and $B^{0}\rightarrow K^{*0}\ell^{+}\ell^{-}$ decays is performed, in two ranges of the dilepton invariant-mass squared, $q^{2}$. The analysis uses beauty mesons produced in proton-proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 $\mathrm{fb}^{-1}$. Each of the four lepton universality measurements reported is either the first in the given $q^{2}$ interval or supersedes previous LHCb measurements. The results are compatible with the predictions of the Standard Model.

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