arXiv subjects

G. Andreassi

Publications and source records attributed to G. Andreassi.

At least 55 records · Page 3Linked to original sources

arXiv2020

Determination of quantum numbers for several excited charmed mesons observed in $B^- \to D^{*+} π^- π^-$ decays

A four-body amplitude analysis of the $B^- \to D^{*+} π^- π^-$ decay is performed, where fractions and relative phases of the various resonances contributing to the decay are measured. Several quasi-model-independent analyses are performed aimed at searching for the presence of new states and establishing the quantum numbers of previously observed charmed meson resonances. In particular the resonance parameters and quantum numbers are determined for the $D_1(2420)$, $D_1(2430)$, $D_0(2550)$, $D^*_1(2600)$, $D_2(2740)$ and $D^*_3(2750)$ states. The mixing between the $D_1(2420)$ and $D_1(2430)$ resonances is studied and the mixing parameters are measured. The dataset corresponds to an integrated luminosity of 4.7 $fb^{-1}$, collected in proton-proton collisions at center-of-mass energies of 7, 8 and 13 TeV with the LHCb detector.

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arXiv2020

Observation of new resonances in the $Λ_{b}^0π^+π^-$ system

We report the observation of a new structure in the $Λ_b^0 π^+π^-$ spectrum using the full LHCb data set of $pp$ collisions, corresponding to an integrated luminosity of $9\,\mathrm{fb}^{-1}$, collected at $\sqrt{s}=7$, 8 and $13\,\mathrm{TeV}$. A study of the structure suggests its interpretation as a superposition of two almost degenerate narrow states. The masses and widths of these states are measured to be \begin{eqnarray*} m_{Λ_{b}\mathrm{(6146)}^0} &=&6146.17 \pm 0.33 \pm 0.22 \pm 0.16\,\mathrm{MeV} \,, m_{Λ_{b}\mathrm{(6152)}^0} &=&6152.51 \pm 0.26 \pm 0.22 \pm 0.16\,\mathrm{MeV} \,, Γ_{Λ_{b}\mathrm{(6146)}^0}&=&\phantom{615}2.9\phantom{0}\pm 1.3\phantom{0} \pm 0.3\phantom{0}\,\mathrm{MeV}\,, Γ_{Λ_{b}\mathrm{(6152)}^0} &=&\phantom{615}2.1\phantom{0}\pm 0.8\phantom{0} \pm 0.3\phantom{0}\,\mathrm{MeV}\,, \end{eqnarray*} with a mass splitting of $Δm = 6.34 \pm 0.32 \pm 0.02\,\mathrm{MeV}$, where the first uncertainty is statistical, the second systematic and the third derives from the knowledge of the mass of the $Λ_b^0$ baryon. The measured masses and widths of these new excited states suggest their possible interpretation as a doublet of $Λ_{b}\mathrm{(1D)}^0$ states.

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arXiv2020

Precision measurement of the $Ξ_{cc}^{++}$ mass

A measurement of the $Ξ_{cc}^{++}$ mass is performed using data collected by the LHCb experiment between 2016 and 2018 in $pp$ collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.6 $\mathrm{fb}^{-1}$. The $Ξ_{cc}^{++}$ candidates are reconstructed via the decay modes $Ξ_{cc}^{++}\toΛ_c^+K^-π^+π^+$ and $Ξ_{cc}^{++}\toΞ_c^+π^+$. The result, $3621.55 \pm 0.23{\rm\,(stat)\,} \pm 0.30 {\rm\,(syst)\,}{\rm MeV}/c^2$, is the most precise measurement of the $Ξ_{cc}^{++}$ mass to date.

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arXiv2020

Measurement of $\mathitΞ_{cc}^{++}$ production in $pp$ collisions at $\sqrt{s}=13$ TeV

The production of $\mathitΞ_{cc}^{++}$ baryons in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV is measured in the transverse-momentum range $4<p_\mathrm{T}<15~\mathrm{GeV}$/$c$ and the rapidity range $2.0<y<4.5$. The data used in this measurement correspond to an integrated luminosity of 1.7 $\mathrm{fb}^{-1}$, recorded by the LHCb experiment during 2016. The ratio of the $\mathitΞ_{cc}^{++}$ production cross-section times the branching fraction of the $\mathit{Ξ_{cc}^{++} \to Λ_{c}^{+} K^- π^+ π^+}$ decay relative to the prompt $\mathit{Λ_c^{+}}$ production cross-section is found to be $(2.22\pm 0.27 \pm 0.29)\times 10^{-4}$, assuming the central value of the measured $\mathit{Ξ_{cc}^{++}}$ lifetime, where the first uncertainty is statistical and the second systematic.

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arXiv2020

Search for $A'\!\to\!μ^+μ^-$ decays

Searches are performed for both prompt-like and long-lived dark photons, $A'$, produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look for $A'\!\to\!μ^+μ^-$ decays using a data sample corresponding to an integrated luminosity of 5.5/fb collected with the LHCb detector. Neither search finds evidence for a signal, and 90% confidence-level exclusion limits are placed on the $γ$-$A'$ kinetic-mixing strength. The prompt-like $A'$ search explores the mass region from near the dimuon threshold up to 70 GeV, and places the most stringent constraints to date on dark photons with $214 < m(A') \lesssim 740$ MeV and $10.6 < m(A') \lesssim 30$ GeV. The search for long-lived $A'\!\to\!μ^+μ^-$ decays places world-leading constraints on low-mass dark photons with lifetimes $\mathcal{O}(1)$ ps.

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arXiv2020

Study of $Υ$ production in $p$Pb collisions at $\sqrt{s_{NN}}=8.16$ TeV

The production of $Υ(nS)$ mesons ($n=1,2,3$) in $p$Pb and Pb$p$ collisions at a centre-of-mass energy per nucleon pair $\sqrt{s_{NN}}=8.16$ TeV is measured by the LHCb experiment, using a data sample corresponding to an integrated luminosity of 31.8 nb$^{-1}$. The $Υ(nS)$ mesons are reconstructed through their decays into two opposite-sign muons. The measurements comprise the differential production cross-sections of the $Υ(1S)$ and $Υ(2S)$ states, their forward-to-backward ratios and nuclear modification factors, performed as a function of the transverse momentum \pt and rapidity in the nucleon-nucleon centre-of-mass frame $y^*$ of the $Υ(nS)$ states, in the kinematic range $p_{\rm{T}}<25$ GeV/$c$ and $1.5<y^*<4.0$ ($-5.0<y^*<-2.5$) for $p$Pb (Pb$p$) collisions. In addition, production cross-sections for $Υ(3S)$ are measured integrated over phase space and the production ratios between all three $Υ(nS)$ states are determined. The measurements are compared to theoretical predictions and suppressions for quarkonium in $p$Pb collisions are observed.

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arXiv2020

Amplitude analysis of the $B^+ \rightarrow π^+π^+π^-$ decay

The results of an amplitude analysis of the charmless three-body decay $B^+ \rightarrow π^+π^+π^-$, in which $C\!P$-violation effects are taken into account, are reported. The analysis is based on a data sample corresponding to an integrated luminosity of $3 \text{fb}^{-1}$ of $pp$ collisions recorded with the LHCb detector. The most challenging aspect of the analysis is the description of the behaviour of the $π^+ π^-$ S-wave contribution, which is achieved by using three complementary approaches based on the isobar model, the K-matrix formalism, and a quasi-model-independent procedure. Additional resonant contributions for all three methods are described using a common isobar model, and include the $ρ(770)^0$, $ω(782)$ and $ρ(1450)^0$ resonances in the $π^+π^-$ P-wave, the $f_2(1270)$ resonance in the $π^+π^-$ D-wave, and the $ρ_3(1690)^0$ resonance in the $π^+π^-$ F-wave. Significant $C\!P$-violation effects are observed in both S- and D-waves, as well as in the interference between the S- and P-waves. The results from all three approaches agree and provide new insight into the dynamics and the origin of $C\!P$-violation effects in $B^+ \rightarrow π^+π^+π^-$ decays.

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arXiv2020

Observation of several sources of $CP$ violation in $B^+ \to π^+ π^+ π^-$ decays

Observations are reported of different sources of $CP$ violation from an amplitude analysis of $B^+ \to π^+ π^+ π^-$ decays, based on a data sample corresponding to an integrated luminosity of $3 \; {\rm fb}^{-1}$ of $pp$ collisions recorded with the LHCb detector. A large $CP$ asymmetry is observed in the decay amplitude involving the tensor $f_2(1270)$ resonance, and in addition significant $CP$ violation is found in the $π^+ π^-$ S-wave at low invariant mass. The presence of $CP$ violation related to interference between the $π^+ π^-$ S-wave and the P-wave $B^+ \to ρ(770)^0 π^+$ amplitude is also established; this causes large local asymmetries but cancels when integrated over the phase space of the decay. The results provide both qualitative and quantitative new insights into $CP$-violation effects in hadronic $B$ decays.

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arXiv2020

Updated measurement of decay-time-dependent CP asymmetries in $D^0 \to K^+K^-$ and $D^0 \to π^+π^-$ decays

A search for decay-time-dependent charge-parity ($CP$) asymmetry in $D^0 \to K^+K^-$ and $D^0 \to π^+π^-$ decays is performed at the LHCb experiment using proton-proton collision data recorded at a center-of-mass energy of 13TeV, and corresponding to an integrated luminosity of 5.4fb$^{-1}$. The $D^0$ mesons are required to originate from semileptonic decays of $b$ hadrons, such that the charge of the muon identifies the flavor of the neutral $D$ meson at production. The asymmetries in the effective decay widths of $D^0$ and $\overline{D}^0$ mesons are determined to be $A_Γ(K^+K^-) = ( -4.3 \pm 3.6 \pm 0.5 )\times 10^{-4}$ and $A_Γ(π^+π^-) = ( 2.2 \pm 7.0 \pm 0.8)\times 10^{-4}$, where the uncertainties are statistical and systematic, respectively. The results are consistent with $CP$ symmetry and, when combined with previous LHCb results, yield $A_Γ(K^+K^-) = ( -4.4 \pm 2.3 \pm 0.6 )\times 10^{-4}$ and $A_Γ(π^+π^-) = ( 2.5 \pm 4.3 \pm 0.7)\times 10^{-4}$.

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arXiv2020

Measurement of CP violation in the $B_s^0\rightarrowϕϕ$ decay and search for the $B^0\rightarrow ϕϕ$ decay

A measurement of the time-dependent CP-violating asymmetry in $B_s^0\rightarrowϕϕ$ decays is presented. Using a sample of proton-proton collision data corresponding to an integrated luminosity of $5.0$fb$^{-1}$ collected by the $\mbox{LHCb}$ experiment at centre-of-mass energies $\sqrt{s} = 7$ TeV in 2011, 8 TeV in 2012 and 13 TeV in 2015 and 2016, a signal yield of around 9000 $B_s^0\rightarrowϕϕ$ decays is obtained. The CP-violating phase $ϕ_s^{s\bar{s}s}$ is measured to be $-0.073 \pm 0.115$(stat)$\pm 0.027$(syst) rad, under the assumption it is independent on the helicity of the $ϕϕ$ decay. In addition, the CP-violating phases of the transverse polarisations under the assumption of CP conservation of the longitudinal phase are measured. The helicity-independent direct CP-violation parameter is also measured, and is found to be $|λ|=0.99 \pm 0.05 $(stat)$ \pm 0.01 $(syst). In addition, $T$-odd triple-product asymmetries are measured. The results obtained are consistent with the hypothesis of CP conservation in $b\rightarrow\bar{s}s\bar{s}$ transitions. Finally, a limit on the branching fraction of the $B^0\rightarrow ϕϕ$ decay is determined to be $\mathcal{B}(B^0\rightarrow ϕϕ)<2.7\times 10^{-8}$ at 90% confidence level.

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arXiv2019

Measurement of the $B_c^-$ meson production fraction and asymmetry in 7 and 13 TeV $pp$ collisions

The production fraction of the $B_c^-$ meson with respect to the sum of $B^-$ and $\bar{B}^0$ mesons is measured in both 7 and 13 TeV center-of-mass energy $pp$ collisions produced by the Large Hadron Collider (LHC), using the LHCb detector. The rate, approximately 3.7 per mille, does not change with energy, but shows a transverse momentum dependence. The $B_c^- - B_c^+$ production asymmetry is also measured, and is consistent with zero within the determined statistical and systematic uncertainties of a few percent.

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arXiv2019

Amplitude analysis of $B^\pm \to π^\pm K^+ K^-$ decays

The first amplitude analysis of the $B^\pm \to π^\pm K^+ K^-$ decay is reported based on a data sample corresponding to an integrated luminosity of 3.0 fb$^{-1}$ of $pp$ collisions recorded in 2011 and 2012 with the LHCb detector. The data is found to be best described by a coherent sum of five resonant structures plus a nonresonant component and a contribution from $ππ\leftrightarrow KK$ $S$-wave rescattering. The dominant contributions in the $π^\pm K^\mp$ and $K^{+}K^{-}$ systems are the nonresonant and the $B^\pm \to ρ(1450)^{0}π^{\pm}$ amplitudes, respectively, with fit fractions around $30\%$. For the rescattering contribution, a sizeable fit fraction is observed. This component has the largest $CP$ asymmetry reported to date for a single amplitude of $(-66 \pm 4 \pm 2)\%$, where the first uncertainty is statistical and the second systematic. No significant $CP$ violation is observed in the other contributions.

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arXiv2019

Measurement of charged hadron production in $Z$-tagged jets in proton-proton collisions at $\sqrt{s}=8$ TeV

The production of charged hadrons within jets recoiling against a $Z$ boson is measured in proton-proton collision data at $\sqrt{s}=8$ TeV recorded by the LHCb experiment. The charged-hadron structure of the jet is studied longitudinally and transverse to the jet axis for jets with transverse momentum $p_{\mathrm{T}}>20$ GeV and in the pseudorapidity range $2.5<η<4$. These are the first measurements of jet hadronization at these forward rapidities and also the first where the jet is produced in association with a $Z$ boson. In contrast to previous hadronization measurements at the Large Hadron Collider, which are dominated by gluon jets, these measurements probe predominantly light-quark jets which are found to be more longitudinally and transversely collimated with respect to the jet axis when compared to the previous gluon dominated measurements. Therefore, these results provide valuable information on differences between quarks and gluons regarding nonperturbative hadronization dynamics.

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arXiv2019

Search for the lepton-flavour-violating decays $B^{0}_{s}\toτ^{\pm}μ^{\mp}$ and $B^{0}\toτ^{\pm}μ^{\mp}$

A search for $B^{0}_{s}\toτ^{\pm}μ^{\mp}$ and $B^{0}\toτ^{\pm}μ^{\mp}$ decays is performed using data corresponding to an integrated luminosity of 3 fb$^{-1}$ of proton-proton collisions, recorded with the LHCb detector in 2011 and 2012. For this search, the $τ$ lepton is reconstructed in the $τ^{-}\toπ^{-}π^{+}π^{-}ν_τ$ channel. No significant signal is observed. Assuming no contribution from $B^{0}\toτ^{\pm}μ^{\mp}$ decays, an upper limit is set on the $B^{0}_{s}\toτ^{\pm}μ^{\mp}$ branching fraction of $\mathcal{B}\left( B^{0}_{s}\toτ^{\pm}μ^{\mp}\right) < 4.2\times 10^{-5}$ at $95\%$ confidence level. If instead no contribution from $B^{0}_{s}\toτ^{\pm}μ^{\mp}$ decays is assumed, a limit of $\mathcal{B}\left( B^{0}\toτ^{\pm}μ^{\mp}\right) < 1.4\times 10^{-5}$ is obtained at $95\%$ confidence level. These are the first limit on $\mathcal{B}\left( B^{0}_{s}\toτ^{\pm}μ^{\mp}\right)$ and the world's best limit on $\mathcal{B}\left( B^{0}\toτ^{\pm}μ^{\mp}\right)$.

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arXiv2019

Measurement of the electron reconstruction efficiency at LHCb

The single electron track-reconstruction efficiency is calibrated using a sample corresponding to $1.3~\mathrm{fb}^{-1}$of $pp$ collision data recorded with the LHCb detector in 2017. This measurement exploits $B^+\to J/ψ(e^+e^-)K^+$ decays, where one of the electrons is fully reconstructed and paired with the kaon, while the other electron is reconstructed using only the information of the vertex detector. Despite this partial reconstruction, kinematic and geometric constraints allow the $B^+$-meson mass to be reconstructed and the signal to be well separated from backgrounds. This in turn allows the electron reconstruction efficiency to be measured by matching the partial track segment found in the vertex detector to tracks found by LHCb's regular reconstruction algorithms. The agreement between data and simulation is evaluated, and corrections are derived for simulated electrons in bins of kinematics. These correction factors allow LHCb to measure branching fractions involving single electrons with a systematic uncertainty below $1\%$.

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arXiv2019

Search for the doubly charmed baryon $Ξ_{cc}^{+}$

A search for the doubly charmed baryon $Ξ_{cc}^{+}$ is performed through its decay to the $Λ_c^+ K^- π^+$ final state, using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13$\mathrm{\,Te\kern -0.1em V}$. The data correspond to a total integrated luminosity of $9\,\mathrm{fb}^{-1}$. No significant signal is observed in the mass range from 3.4 to 3.8$\mathrm{\,Ge\kern -0.1em V}/c^2$. Upper limits are set at $95\%$ credibility level on the ratio of the $Ξ_{cc}^{+}$ production cross-section times the branching fraction to that of $Λ_c^+$ and $Ξ_{cc}^{++}$ baryons. The limits are determined as functions of the $Ξ_{cc}^{+}$ mass for different lifetime hypotheses, in the rapidity range from 2.0 to 4.5 and the transverse momentum range from 4 to 15$\mathrm{\,Ge\kern -0.1em V}/c$.

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arXiv2019

First measurement of charm production in fixed-target configuration at the LHC

The first measurement of heavy-flavour production by the LHCb experiment in its fixed-target mode is presented. The production of $J/ψ$ and $D^0$ mesons is studied with beams of protons of different energies colliding with gaseous targets of helium and argon with nucleon-nucleon centre-of-mass energies of $\sqrt{s_{NN}} = 86.6 $ and $ 110.4$ ${\rm GeV}$, respectively. The $J/ψ$ and $D^0$ (including charge conjugate) production cross sections in $p{\rm He}$ collisions in the rapidity range $[2,4.6]$ are found to be $σ_{J/ψ} = 652 \pm 33$ (stat) $\pm 42$ (syst) nb$/$nucleon and $σ_{D^0} = 80.8 \pm 2.4$ (stat) $\pm 6.3$ (syst) $μ$b$/$nucleon, where the first uncertainty is statistical and the second is systematic. No evidence for a substantial intrinsic charm content of the nucleon is observed in the large Bjorken-$x$ region.

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arXiv2019

A search for $\itΞ^{++}_{cc} \rightarrow D^{+} p K^{-} π^{+}$ decays

A search for the $\itΞ^{++}_{cc}$ baryon through the $\itΞ^{++}_{cc} \rightarrow D^{+} p K^{-} π^{+}$ decay is performed with a data sample corresponding to an integrated luminosity of 1.7 $\mathrm{fb}^{-1}$ recorded by the LHCb experiment in $pp$ collisions at a centre-of-mass energy of 13 TeV. No significant signal is observed in the mass range from the kinematic threshold of the decay to 3800 $\mathrm{MeV}/c^{2}$. An upper limit is set on the ratio of branching fractions $\mathcal{R} = \frac{\mathcal{B}(\itΞ^{++}_{cc} \rightarrow D^{+} p K^{-} π^{+})}{\mathcal{B}(\itΞ^{++}_{cc} \rightarrow Λ^{+}_{c} K^{-} π^{+}π^{+})}$ with $\mathcal{R} < 1.7 \hspace{2pt} (2.1) \times 10^{-2}$ at the 90% (95%) confidence level at the known mass of the $\itΞ^{++}_{cc}$ state.

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