arXiv subjects

J. Bartz

Publications and source records attributed to J. Bartz.

179 records · Page 10Linked to original sources

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.

hep-ex↗

arXiv2024

Tracking of charged particles with nanosecond lifetimes at LHCb

A method is presented to reconstruct charged particles with lifetimes between 10 ps and 10 ns, which considers a combination of their decay products and the partial tracks created by the initial charged particle. Using the $Ξ^-$ baryon as a benchmark, the method is demonstrated with simulated events and proton-proton collision data at $\sqrt{s}=13$ TeV, corresponding to an integrated luminosity of 2.0 fb${}^{-1}$ collected with the LHCb detector in 2018. Significant improvements in the angular resolution and the signal purity are obtained. The method is implemented as part of the LHCb Run 3 event trigger in a set of requirements to select detached hyperons. This is the first demonstration of the applicability of this approach at the LHC, and the first to show its scaling with instantaneous luminosity.

hep-ex↗

arXiv2024

Amplitude analysis and branching fraction measurement of $B^{+}\to D^{*-}D^{+}_{s}π^{+}$ decays

The decays of the $B^{+}$ meson to the final state $D^{*-}D^{+}_{s}π^{+}$ are studied in proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb$^{-1}$. The ratio of branching fractions of the $B^{+}\to D^{*-}D^{+}_{s}π^{+}$ and $B^{0}\to D^{*-}D^{+}_{s}$ decays is measured to be $0.173\pm 0.006\pm 0.010$, where the first uncertainty is statistical and the second is systematic. Using partially reconstructed $D^{*+}_{s}\to D^{+}_{s}γ$ and $D^{+}_{s}π^{0}$ decays, the ratio of branching fractions between the $B^{+}\to D^{*-}D^{*+}_{s}π^{+}$ and $B^{+}\to D^{*-}D^{+}_{s}π^{+}$ decays is determined as $1.31\pm 0.07\pm 0.14$. An amplitude analysis of the $B^{+}\to D^{*-}D^{+}_{s}π^{+}$ decay is performed for the first time, revealing dominant contributions from known excited charm resonances decaying to the $D^{*-}π^{+}$ final state. No significant evidence of exotic contributions in the $D^{+}_{s}π^{+}$ or $D^{*-}D^{+}_{s}$ channels is found. The fit fraction of the scalar state $T_{c\bar{s} 0}^{\ast}(2900)^{++}$ observed in the $B^{+}\to D^{-}D^{+}_{s}π^{+}$ decay is determined to be less than 2.3% at a 90% confidence level.

hep-ex↗

arXiv2024

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

A measurement of time-dependent $CP$ violation in $D^0 \rightarrow π^+ π^- π^0$ decays using a $pp$ collision data sample collected by the LHCb experiment in 2012 and from 2015 to 2018, corresponding to an integrated luminosity of 7.7$\,\mathrm{fb}^{-1}$, is presented. The initial flavour of each $D^0$ candidate is determined from the charge of the pion produced in the $D^*(2010)^+ \rightarrow D^0 π^+$ decay. The decay $D^0 \rightarrow K^- π^+ π^0$ is used as a control channel to validate the measurement procedure. The gradient of the time-dependent $CP$ asymmetry, $ΔY$, in $D^0 \rightarrow π^+ π^- π^0$ decays is measured to be \begin{equation*} ΔY = (-1.3 \pm 6.3 \pm 2.4) \times 10^{-4}, \end{equation*} where the first uncertainty is statistical and the second is systematic, which is compatible with $CP$ conservation.

hep-ex↗

arXiv2024

First observation of $Λ_{b}^{0} \rightarrow Σ_c^{()++} D^{()-} K^{-}$ decays

The four decays, $Λ_{b}^{0} \rightarrow Σ_c^{(*)++} D^{(*)-} K^{-}$, are observed for the first time using proton-proton collision data collected with the LHCb detector at a centre-of-mass energy of $13\,\rm{TeV}$, corresponding to an integrated luminosity of $6\,\rm{fb}^{-1}$. By considering the $Λ_b^0 \rightarrow Λ_c^{+} \overline{D}^0 K^{-}$ decay as reference channel, the following branching fraction ratios are measured to be $$\frac{\cal{B} (Λ_{b}^{0} \rightarrow Σ_{c}^{++} \rm{D}^{-} {K}^{-})}{\cal{B}(Λ_{b}^{0} \rightarrow Λ_c^{+} \rm \overline{D}^0 {K}^{-})} = {0.282}\pm{0.016}\pm{0.016}\pm{0.005}, \frac{\cal{B}(Λ_{b}^{0} \rightarrow Σ_{c}^{*++} \rm {D}^{-} {K}^{-})}{\cal{B}(Λ_{b}^{0} \rightarrow Σ_c^{++} \rm {D}^{-} {K}^{-})} = {0.460}\pm{0.052}\pm{0.028}, \frac{\cal{B}(Λ_{b}^{0} \rightarrow Σ_{c}^{++} \rm {D}^{*-} {K}^{-})}{\cal{B}(Λ_{b}^{0} \rightarrow Σ_c^{++} \rm {D}^{-} {K}^{-})} = {2.261}\pm{0.202}\pm{0.129}\pm{0.046}, \frac{\cal{B}(Λ_{b}^{0} \rightarrow Σ_{c}^{*++} \rm D^{*-} K^{-})}{\cal{B}(Λ_{b}^{0} \rightarrow Σ_c^{++} \rm D^{-} K^{-})} = {0.896}\pm{0.137}\pm{0.066}\pm{0.018},$$ where the first uncertainties are statistical, the second are systematic, and the third are due to uncertainties in the branching fractions of intermediate particle decays. These initial observations mark the beginning of pentaquark searches in these modes, with more data set to become available following the LHCb upgrade.

hep-ex↗

arXiv2024

Search for the $B_s^0 \rightarrow μ^+μ^-γ$ decay

A search for the fully reconstructed $B_s^0 \rightarrow μ^+μ^-γ$ decay is performed at the LHCb experiment using proton-proton collisions at $\sqrt{s}=13$\,TeV corresponding to an integrated luminosity of $5.4\,\mathrm{fb^{-1}}$. No significant signal is found and upper limits on the branching fraction in intervals of the dimuon mass are set \begin{align} {\cal B}(B_s^0 \rightarrow μ^+μ^-γ) < 4.2\times10^{-8},~&m(μμ)\in[2m_μ,~1.70]\,\mathrm{GeV/c^2} ,\nonumber {\cal B}(B_s^0 \rightarrow μ^+μ^-γ) < 7.7\times10^{-8},~&m(μμ)\in[1.70,~2.88]\,\mathrm{GeV/c^2},\nonumber {\cal B}(B_s^0 \rightarrow μ^+μ^-γ) < 4.2\times10^{-8},~&m(μμ)\in[3.92 ,~m_{B_s^0}]\,\mathrm{GeV/c^2},\nonumber \end{align} at 95\% confidence level. Additionally, upper limits are set on the branching fraction in the $[2m_μ,~1.70]\,\mathrm{GeV/c^2}$ dimuon mass region excluding the contribution from the intermediate $ϕ(1020)$ meson, and in the region combining all dimuon-mass intervals.

hep-ex↗

arXiv2024

Amplitude analysis of the $Λ_b^0\to pK^-γ$ decay

The resonant structure of the radiative decay $Λ_b^0\to pK^-γ$ in the region of proton-kaon invariant-mass up to 2.5 GeV$/c^2$ is studied using proton-proton collision data recorded at centre-of-mass energies of 7, 8, and 13 TeV collected with the LHCb detector, corresponding to a total integrated luminosity of 9 fb$^{-1}$. Results are given in terms of fit and interference fractions between the different components contributing to this final state. Only $Λ$ resonances decaying to $pK^-$ are found to be relevant, where the largest contributions stem from the $Λ(1520)$, $Λ(1600)$, $Λ(1800)$, and $Λ(1890)$ states.

hep-ex↗

arXiv2024

Observation of $Λ_{b}^{0} \to Λ_{c}^{+} \bar{D}^{()0} K^{-}$ and $Λ_{b}^{0} \to Λ_{c}^{+} D_{s}^{-}$ decays

The decays $Λ_b^0 \to Λ_c^+\bar{D}^{(*)0}K^-$ and $Λ_b^0 \to Λ_c^+ D_s^{*-}$ are observed for the first time, in proton-proton collision data at $\sqrt{s}=13$TeV corresponding to an integrated luminosity of 5.4 fb${}^{-1}$ collected with the LHCb detector. Their ratios of branching fractions with respect to the $Λ_b^0\!\toΛ_c^+\mathrm{D}_s^-$ mode are measured to be \begin{align*} \begin{split} \frac{\mathcal{B}(Λ_b^0 \to Λ_c^+\bar{D}^0 K^-)}{\mathcal{B}(Λ_b^0 \to Λ_c^+ D_s^-)} & = 0.1908 {}_{-0.0034}^{+0.0036} {}_{-0.0018}^{+0.0016} \pm 0.0038 \frac{\mathcal{B}(Λ_b^0 \to Λ_c^+\bar{D}^{*0} K^-)}{\mathcal{B}(Λ_b^0 \to Λ_c^+ D_s^-)} & = 0.589 {}_{-0.017}^{+0.018} {}_{-0.018}^{+0.017} \pm 0.012 \frac{\mathcal{B}(Λ_b^0 \to Λ_c^+ D_s^{*-})}{\mathcal{B}(Λ_b^0 \to Λ_c^+ D_s^-)} & = 1.668 \pm 0.022 {}_{-0.055}^{+0.061}\ , \end{split} \end{align*} where the first uncertainties are statistical, the second systematic, and the third, for the $Λ_b^0 \to Λ_c^+ \bar{D}^{(*)0} K^-$ decays, are due to the uncertainties on the branching fractions of the $D_s^- \to K^- K^+ π^-$ and $\bar{D}^0 \to K^+π^-$ decay modes. The measured branching fractions probe factorization assumptions in effective theories and provide the normalization for future pentaquark searches in $Λ_b^0 \to Λ_c^+ \bar{D}^{(*)0}K^-$ decay channels.

hep-ex↗

arXiv2024

Multiplicity dependence of $σ_{ψ(2S)}/σ_{J/ψ}$ in $pp$ collisions at $\sqrt{s}=13$ TeV

The ratio of production cross-sections of $ψ(2S)$ over $J/ψ$ mesons as a function of charged-particle multiplicity in proton-proton collisions at a centre-of-mass energy $\sqrt{s}=13$ TeV is measured with a data sample collected by the LHCb detector, corresponding to an integrated luminosity of 658 pb$^{-1}$. The ratio is measured for both prompt and non-prompt $ψ(2S)$ and $J/ψ$ mesons. When there is an overlap between the rapidity ranges over which multiplicity and charmonia production are measured, a multiplicity-dependent modification of the ratio is observed for prompt mesons. No significant multiplicity dependence is found when the ranges do not overlap. For non-prompt production, the $ψ(2S)-to-J/ψ$ production ratio is roughly independent of multiplicity irrespective of the rapidity range over which the multiplicity is measured. The results are compared to predictions of the co-mover model and agree well except in the low multiplicity region. The ratio of production cross-sections of $ψ(2S)$ over $J/ψ$ mesons are cross-checked with other measurements in di-lepton channels and found to be compatible.

hep-ex↗

arXiv2024

Measurement of the Branching Fraction of $B^{0} \rightarrow J/ψπ^{0}$ Decays

The ratio of branching fractions between $B^{0} \rightarrow J/ψπ^{0}$ and $B^{+} \rightarrow J/ψK^{*+}$ decays is measured with proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb$^{-1}$. The measured value is $\frac{\mathcal{B}_{B^{0} \rightarrow J/ψπ^{0}}}{\mathcal{B}_{B^{+} \rightarrow J/ψK^{*+}}} = (1.153 \pm 0.053 \pm 0.048 ) \times 10^{-2}$, where the first uncertainty is statistical and the second is systematic. The branching fraction for $B^{0} \rightarrow J/ψπ^{0}$ decays is determined using the branching fraction of the normalisation channel, resulting in $\mathcal{B}_{B^{0} \rightarrow J/ψπ^{0}} = (1.670 \pm 0.077 \pm 0.069 \pm 0.095) \times 10^{-5}$, where the last uncertainty corresponds to that of the external input. This result is consistent with the current world average value and competitive with the most precise single measurement to date.

hep-ex↗

arXiv2024

Search for $B_c^+\toπ^+μ^+μ^-$ decays and measurement of the branching fraction ratio ${\cal B}(B_c^+\toψ(2S)π^+)/{\cal B}(B_c^+\to J/ψπ^+)$

The first search for nonresonant $B_c^+\toπ^+μ^+μ^-$ decays is reported. The analysis uses proton-proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb$^{-1}$. No evidence for an excess of signal events over background is observed and an upper limit is set on the branching fraction ratio ${\cal B}(B_c^+\toπ^+μ^+μ^-)/{\cal B}(B_c^+\to J/ψπ^+) < 2.1\times 10^{-4}$ at $90\%$ confidence level. Additionally, an updated measurement of the ratio of the $B_c^+\toψ(2S)π^+$ and $B_c^+\to J/ψπ^+$ branching fractions is reported. The ratio ${\cal B}(B_c^+\toψ(2S)π^+)/{\cal B}(B_c^+\to J/ψπ^+)$ is measured to be $0.254\pm 0.018 \pm 0.003 \pm 0.005$, where the first uncertainty is statistical, the second systematic, and the third is due to the uncertainties on the branching fractions of the leptonic $J/ψ$ and $ψ(2S)$ decays. This measurement is the most precise to date and is consistent with previous LHCb results.

hep-ex↗

arXiv2024

Observation of the $B_c^+ \to J/ψπ^+ π^0$ decay

The first observation of the $B_c^+ \to J/ψπ^+ π^0$ decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 9fb$^{-1}$, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV. The ratio of its branching fraction relative to the $B_c^+ \to J/ψπ^+$ channel is measured to be $$ \frac{ {\cal{B}}( B_c^+ \to J/ψπ^+π^0 ) } { {\cal{B}}( B_c^+ \to J/ψπ^+ ) } = 2.80 \pm 0.15 \pm 0.11 \pm 0.16 \,, $$ where the first uncertainty is statistical, the second systematic and the third related to imprecise knowledge of the branching fractions for $B^+ \to J/ψK^{*+}$ and $B^+ \to J/ψK^+$ decays, which are used to determine the $π^0$ detection efficiency. The $π^+π^0$ mass spectrum is found to be consistent with the dominance of an intermediate $ρ^+$ contribution in accordance with a model based on QCD factorisation.

hep-ex↗

arXiv2024

Study of $CP$ violation in $B^0_{(s)} \to D K^{*}(892)^0$ decays with $D \to K π( ππ)$, $ ππ( ππ)$, and $KK$ final states

A measurement of $CP$-violating observables associated with the interference of $B^0\to D^0 K^{*}(892)^0$ and $B^0\to \bar{D}^0 K^*(892)^0$ decay amplitudes is performed in the $D^0 \to K^{\mp}π^{\pm}(π^+π^-),$ $D^0 \to π^+π^-(π^+π^-)$, and $D^0\to K^+K^-$ final states using data collected by the LHCb experiment corresponding to an integrated luminosity of $9$ $\text{fb}^{-1}$. $CP$-violating observables related to the interference of $B^0_s\to D^0 \bar{K}^*(892)^0$ and $B_s^0\to \bar{D}^0 \bar{K}^*(892)^0$ are also measured, but no evidence for interference is found. The $B^0$ observables are used to constrain the parameter space of the CKM angle $γ$ and the hadronic parameters $r_{B^0}^{DK^*}$ and $δ_{B^0}^{DK^*}$ with inputs from other measurements. In a combined analysis, these measurements allow for four solutions in the parameter space, only one of which is consistent with the world average.

hep-ex↗

arXiv2024

Curvature-bias corrections using a pseudomass method

Momentum measurements for very high momentum charged particles, such as muons from electroweak vector boson decays, are particularly susceptible to charge-dependent curvature biases that arise from misalignments of tracking detectors. Low momentum charged particles used in alignment procedures have limited sensitivity to coherent displacements of such detectors, and therefore are unable to fully constrain these misalignments to the precision necessary for studies of electroweak physics. Additional approaches are therefore required to understand and correct for these effects. In this paper the curvature biases present at the LHCb detector are studied using the pseudomass method in proton-proton collision data recorded at centre of mass energy $\sqrt{s}=13$ TeV during 2016, 2017 and 2018. The biases are determined using $Z\toμ^+μ^-$ decays in intervals defined by the data-taking period, magnet polarity and muon direction. Correcting for these biases, which are typically at the $10^{-4}$ GeV$^{-1}$ level, improves the $Z\toμ^+μ^-$ mass resolution by roughly 18% and eliminates several pathological trends in the kinematic-dependence of the mean dimuon invariant mass.

hep-ex↗

arXiv2024

Study of $B_c^+ \rightarrow χ_c π^+$ decays

A study of $B_c^+ \rightarrow χ_c π^+$ decays is reported using proton-proton collision data, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9fb$^{-1}$. The decay $B_c^+ \rightarrow χ_{c2} π^+$ is observed for the first time, with a significance exceeding seven standard deviations. The relative branching fraction with respect to the $B_c^+ \rightarrow J/ψπ^+$ decay is measured to be $$ \frac{\mathcal{B}_{B_c^+ \rightarrow χ_{c2} π^+}} {\mathcal{B}_{B_c^+ \rightarrow J/ψπ^+}} = 0.37 \pm 0.06 \pm 0.02 \pm 0.01 , $$ where the first uncertainty is statistical, the second is systematic, and the third is due to the knowledge of the $χ_c \rightarrow J/ψγ$ branching fraction. No significant $B_c^+ \rightarrow χ_{c1} π^+$ signal is observed and an upper limit for the relative branching fraction for the $B_c^+ \rightarrow χ_{c1} π^+$ and $B_c^+ \rightarrow χ_{c2} π^+$ decays of $$ \frac{\mathcal{B}_{B_c^+ \rightarrow χ_{c1} π^+}} {\mathcal{B}_{B_c^+ \rightarrow χ_{c2} π^+}} < 0.49 $$ is set at the 90\% confidence level.

hep-ex↗

arXiv2024

Momentum scale calibration of the LHCb spectrometer

For accurate determination of particle masses accurate knowledge of the momentum scale of the detectors is crucial. The procedure used to calibrate the momentum scale of the LHCb spectrometer is described and illustrated using the performance obtained with an integrated luminosity of $1.6~ fb^{-1}$ collected during 2016 in $pp$ running. The procedure uses large samples of $J/ψ\rightarrow μ^+ μ^-$ and $B^+ \rightarrow J/ψK^+$ decays and leads to a relative accuracy of $3 \times 10^{-4}$ on the momentum scale.

hep-ex↗

arXiv2015

Characterizing the Rigidly Rotating Magnetosphere Stars HD 345439 and HD 23478

The SDSS III APOGEE survey recently identified two new $σ$ Ori E type candidates, HD 345439 and HD 23478, which are a rare subset of rapidly rotating massive stars whose large (kGauss) magnetic fields confine circumstellar material around these systems. Our analysis of multi-epoch photometric observations of HD 345439 from the KELT, SuperWASP, and ASAS surveys reveals the presence of a $\sim$0.7701 day period in each dataset, suggesting the system is amongst the faster known $σ$ Ori E analogs. We also see clear evidence that the strength of H-alpha, H I Brackett series lines, and He I lines also vary on a $\sim$0.7701 day period from our analysis of multi-epoch, multi-wavelength spectroscopic monitoring of the system from the APO 3.5m telescope. We trace the evolution of select emission line profiles in the system, and observe coherent line profile variability in both optical and infrared H I lines, as expected for rigidly rotating magnetosphere stars. We also analyze the evolution of the H I Br-11 line strength and line profile in multi-epoch observations of HD 23478 from the SDSS-III APOGEE instrument. The observed periodic behavior is consistent with that recently reported by Sikora and collaborators in optical spectra.

astro-ph.SR↗