arXiv subjects

G. Bassi

Publications and source records attributed to G. Bassi.

At least 163 records · Page 9Linked to original sources

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

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

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

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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arXiv2022

Identification of charm jets at LHCb

The identification of charm jets is achieved at LHCb for data collected in 2015-2018 using a method based on the properties of displaced vertices reconstructed and matched with jets. The performance of this method is determined using a dijet calibration dataset recorded by the LHCb detector and selected such that the jets are unbiased in quantities used in the tagging algorithm. The charm-tagging efficiency is reported as a function of the transverse momentum of the jet. The measured efficiencies are compared to those obtained from simulation and found to be in good agreement.

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arXiv2022

Precise determination of the B0s-B0sbar oscillation frequency

Mesons comprising a beauty quark and a strange quark can oscillate between particle (B0s) and antiparticle (B0s) flavour eigenstates, with a frequency given by the mass difference between heavy and light mass eigenstates, deltams. Here we present ameasurement of deltams using B0s2DsPi decays produced in proton-proton collisions collected with the LHCb detector at the Large Hadron Collider. The oscillation frequency is found to be deltams = 17.7683 +- 0.0051 +- 0.0032 ps-1, where the first uncertainty is statistical and the second systematic. This measurement improves upon the current deltams precision by a factor of two. We combine this result with previous LHCb measurements to determine deltams = 17.7656 +- 0.0057 ps-1, which is the legacy measurement of the original LHCb detector.

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arXiv2022

Measurement of the $B^0_s\toμ^+μ^-$ decay properties and search for the $B^0\toμ^+μ^-$ and $B^0_s\toμ^+μ^-γ$ decays

An improved measurement of the decay $B^0_s\toμ^+μ^-$ and searches for the decays $B^0\toμ^+μ^-$ and $B^0_s\toμ^+μ^-γ$ are performed at the LHCb experiment using data collected in proton-proton collisions at $\sqrt{s} = 7,~8$ and $13$ TeV, corresponding to integrated luminosities of 1, 2 and 6 fb$^{-1}$, respectively. The $B^0_s\toμ^+μ^-$ branching fraction and effective lifetime are measured to be ${\mathcal{B}}(B^0_s\toμ^+μ^-)=\left(3.09^{+0.46+0.15}_{-0.43-0.11}\right)\times 10^{-9}$ and $τ(B^0_s\toμ^+μ^-)=(2.07\pm 0.29\pm 0.03)$ ps, respectively, where the uncertainties include both statistical and systematic contributions. No significant signal for $B^0\toμ^+μ^-$ and $B^0_s\toμ^+μ^-γ$ decays is found and the 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 95% confidence level are determined, where the latter is limited to the range $m_{μμ} > 4.9$ GeV$/c^2$. Additionally, the ratio between the $B^0\toμ^+μ^-$ and $B^0_s\toμ^+μ^-$ branching fractions is measured to be $\mathcal{R}_{μ^+μ^-}<0.095$ at 95% confidence level. The results are in agreement with the Standard Model predictions.

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arXiv2022

Measurement of $χ_{c1}(3872)$ production in proton-proton collisions at $\sqrt{s}=8$ and $13$ TeV

The production cross-section of the $χ_{c1}(3872)$ state relative to the $ψ(2S)$ meson is measured using proton-proton collision data collected with the LHCb experiment at centre-of-mass energies of $\sqrt{s}=8$ and 13 TeV, corresponding to integrated luminosities of 2.0 and 5.4 fb$^{-1}$, respectively. The two mesons are reconstructed in the $J/ψπ^{+}π^{-}$ final state. The ratios of the prompt and nonprompt $χ_{c1}(3872)$ to $ψ(2S)$ production cross-sections are measured as a function of transverse momentum, $p_{\rm T}$, and rapidity, $y$, in the kinematic range $4 < p_{\rm T} < 20$ GeV/$c$ and $2.0 < y < 4.5$. The prompt ratio is found to increase with $p_{\rm T}$ independently of $y$. The double-differential cross-section ratio of $χ_{c1}(3872)$ relative to $ψ(2S)$ mesons between 13 and 8 TeV is also measured for the prompt component and observed to be consistent with unity, independent of $p_{\rm T}$ and centre-of-mass energy.

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