arXiv subjects

G. Bencivenni

Publications and source records attributed to G. Bencivenni.

At least 271 records · Page 15Linked to original sources

arXiv2022

Evidence for a new structure in the $J/ψp$ and $J/ψ\bar{p}$ systems in $B_s^0 \to J/ψp \bar{p}$ decays

An amplitude analysis of flavour-untagged $B_s^0 \to J/ψp \bar{p}$ decays is performed using a sample of $797\pm31$ decays reconstructed with the LHCb detector. The data, collected in proton-proton collisions between 2011 and 2018, correspond to an integrated luminosity of 9 $\text{fb}^{-1}$. Evidence for a new structure in the $J/ψp$ and $J/ψ\bar{p}$ systems with a mass of $4337 \ ^{+7}_{-4} \ ^{+2}_{-2}~\text{MeV}$ and a width of $29 \ ^{+26}_{-12} \ ^{+14}_{-14}~\text{MeV}$ is found, where the first uncertainty is statistical and the second systematic, with a significance in the range of 3.1 to 3.7 $σ$, depending on the assigned $J^P$ hypothesis.

hep-ex↗

arXiv2022

Angular analysis of $D^0 \to π^+π^-μ^+μ^-$ and $D^0 \to K^+K^-μ^+μ^-$ decays and search for $CP$ violation

The first full angular analysis and an updated measurement of the decay-rate $CP$ asymmetry of the $D^0 \to π^+π^-μ^+μ^-$ and $D^0 \to K^+K^-μ^+μ^-$ decays are reported. The analysis uses proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13 TeV. The data set corresponds to an integrated luminosity of 9 fb$^{-1}$. The full set of $CP$-averaged angular observables and their $CP$ asymmetries are measured as a function of the dimuon invariant mass. The results are consistent with expectations from the standard model and with $CP$ symmetry.

hep-ex↗

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.

hep-ex↗

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.

hep-ex↗

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.

hep-ex↗

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.

hep-ex↗

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.

hep-ex↗

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.

hep-ex↗

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.

hep-ex↗

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.

hep-ex↗

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.

hep-ex↗

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 $$ \frac{ {\mathcal{B}} ( Λ_b^0\rightarrow D^{*+} p π^-π^- )} { {\mathcal{B}} ( Λ_b^0\rightarrow D^{+} p π^-π^- )} \times ( {\mathcal{B}}( D^{*+} \rightarrow π^0 ) + {\mathcal{B}}( D^{*+} \rightarrow γ)) = ( 61.3 \pm 4.3 \pm 4.0 ) \% \,. $$

hep-ex↗

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.

hep-ex↗

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.

hep-ex↗

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.

hep-ex↗

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.

hep-ex↗

arXiv2022

MPGDs for tracking and Muon detection at future high energy physics colliders

In the next years, the energy and intensity frontiers of the experimental Particle Physics will be pushed forward with the upgrade of existing accelerators (LHC at CERN) and the envisaged construction of new machines at energy scales up to hundreds TeV or with unprecedented intensity (FCC-hh, FCC-ee, ILC, Muon Collider). Large size, cost-effective, high-efficiency detection systems in high background environments are required in order to accomplish the physics program. MPGDs offer a diversity of technologies that allow them to meet the required performance challenges at future facilities thanks to the specific advantages that each technology provides. MPGDs allow stable operation, with environmentally friendly gas mixtures, at very high background particle flux with high detection efficiency and excellent spatial resolution. These features make MPGD one of the primary choices as precise muon tracking and trigger system in general-purpose detectors at future HEP colliders. In addition, the low material budget and the flexibility of the base material make MPGDs suitable for the development of very light, full cylindrical fine tracking inner trackers at lepton colliders. On-going R&Ds aim at pushing the detector performance at the limits of each technology. We are working in continuing to consolidate the construction and stable operation of large-size detectors, able to cope with large particle fluxes. In this white paper, we describe some of the most prominent MPGD technologies, their performance measurements, the challenges faced in the most recent applications, and the areas of improvement towards efficient tracking and Muon detection at future high energy physics colliders.

physics.ins-det↗

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.

hep-ex↗