arXiv subjects

G. Andreassi

Publications and source records attributed to G. Andreassi.

At least 253 records · Page 14Linked to original sources

arXiv2016

Observation of $ Λ_b^0 \to ψ(2S)pK^-$ and $ Λ_b^0 \to J/ψπ^+ π^- pK^-$ decays and a measurement of the $Λ_b^0$ baryon mass

The decays $ Λ_b^0 \to ψ(2S)pK^-$ and $ Λ_b^0 \to J/ψπ^+ π^- pK^-$ are observed in a data sample corresponding to an integrated luminosity of 3fb$^{-1}$, collected in proton-proton collisions at 7 and 8TeV centre-of-mass energies by the LHCb detector. The $ψ(2S)$ mesons are reconstructed through the decay modes $ψ(2S)\toμ^+μ^-$ and $ψ(2S)\to J/ψπ^+π^-$. The branching fractions relative to that of $ Λ_b^0 \to J/ψpK^-$ are measured to be \begin{eqnarray*} \frac{\mathcal{B}(Λ_b^0 \to ψ(2S) pK^-)} {\mathcal{B}(Λ_b^0 \to J/ψpK^-)} & = & (20.70\pm 0.76\pm 0.46\pm 0.37)\times10^{-2} \,, \frac{\mathcal{B}(Λ_b^0 \to J/ψπ^+ π^- pK^-)} {\mathcal{B}(Λ_b^0 \to J/ψpK^-)} & = & (20.86\pm 0.96\pm 1.34)\times10^{-2} \,, \end{eqnarray*} where the first uncertainties are statistical, the second are systematic and the third is related to the knowledge of $J/ψ$ and $ψ(2S)$ branching fractions. The mass of the $Λ_b^0$ baryon is measured to be $$ M(Λ_b^0) = 5619.65 \pm 0.17 \pm 0.17\mathrm{MeV}/c^2,$$ where the uncertainties are statistical and systematic.

hep-ex↗

arXiv2016

First observation of the decay $D^{0}\rightarrow K^{-}π^{+}μ^{+}μ^{-}$ in the $ρ^{0}$-$ω$ region of the dimuon mass spectrum

A study of the decay $D^{0}\rightarrow K^{-}π^{+}μ^{+}μ^{-}$ is performed using data collected by the LHCb detector in proton-proton collisions at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2.0 fb$^{-1}$. Decay candidates with muon pairs that have an invariant mass in the range 675--875 MeV$/c^2$ are considered. This region is dominated by the $ρ^{0}$ and $ω$ resonances. The branching fraction in this range is measured to be ${\cal B}$($D^{0}\rightarrow K^{-}π^{+}μ^{+}μ^{-}$) = $(4.17 \pm 0.12(stat) \pm 0.40(syst))\times10^{-6}$. This is the first observation of the decay $D^{0}\rightarrow K^{-}π^{+}μ^{+}μ^{-}$. Its branching fraction is consistent with the value expected in the Standard Model.

hep-ex↗

arXiv2016

Measurement of the properties of the $Ξ_b^{*0}$ baryon

We perform a search for near-threshold $Ξ_b^0$ resonances decaying to $Ξ_b^- π^+$ in a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by the LHCb experiment. We observe one resonant state, with the following properties: \begin{eqnarray*} m(Ξ_b^{*0}) - m(Ξ_b^-) - m(π^+) &=& 15.727 \pm 0.068 \, (\mathrm{stat}) \pm 0.023 \, (\mathrm{syst}) \, \mathrm{MeV}/c^2, Γ(Ξ_b^{*0}) &=& 0.90 \pm 0.16 \, (\mathrm{stat}) \pm 0.08 \, (\mathrm{syst}) \, \mathrm{MeV} . \end{eqnarray*} This confirms the previous observation by the CMS collaboration. The state is consistent with the $J^P=3/2^+$ $Ξ_b^{*0}$ resonance expected in the quark model. This is the most precise determination of the mass and the first measurement of the natural width of this state. We have also measured the ratio \begin{align*} \frac{σ(pp \to Ξ_b^{*0} X){\cal{B}}(Ξ_b^{*0} \to Ξ_b^- π^+)}{σ(pp \to Ξ_b^- X)} = 0.28 \pm 0.03 \, (\mathrm{stat}) \pm 0.01 \, (\mathrm{syst}) . \end{align*}

hep-ex↗

arXiv2016

Measurement of forward $W$ and $Z$ boson production in association with jets in proton-proton collisions at $\sqrt{s}=8$ TeV

The production of $W$ and $Z$ bosons in association with jets is studied in the forward region of proton-proton collisions collected at a centre-of-mass energy of 8 TeV by the LHCb experiment, corresponding to an integrated luminosity of 1.98 $\pm$ 0.02 fb$^{-1}$. The $W$ boson is identified using its decay to a muon and a neutrino, while the $Z$ boson is identified through its decay to a muon pair. Total cross-sections are measured and combined into charge ratios, asymmetries, and ratios of $W+$jet and $Z$+jet production cross-sections. Differential measurements are also performed as a function of both boson and jet kinematic variables. All results are in agreement with Standard Model predictions.

hep-ex↗

arXiv2016

Observations of $Λ_b^0 \to ΛK^+π^-$ and $Λ_b^0 \to ΛK^+K^-$ decays and searches for other $Λ_b^0$ and $Ξ_b^0$ decays to $Λh^+h^{\prime -}$ final states

A search is performed for the charmless three-body decays of the $Λ_b^0$ and $Ξ_b^0$ baryons to the final states $Λh^+h^{\prime -}$, where $h^{(\prime)} = π$ or $K$. The analysis is based on a data sample, corresponding to an integrated luminosity of $3 \rm fb^{-1}$ of $pp$ collisions, collected by the LHCb experiment. The $Λ_b^0 \to ΛK^+π^-$ and $Λ_b^0 \to ΛK^+K^-$ decays are observed for the first time and their branching fractions and $CP$ asymmetry parameters are measured. Evidence is seen for the $Λ_b^0 \to Λπ^+π^-$ decay and limits are set on the branching fractions of $Ξ_b^0$ baryon decays to the $Λh^+h^{\prime -}$ final states.

hep-ex↗

arXiv2016

Measurement of the mass and lifetime of the $Ω_b^-$ baryon

A proton-proton collision data sample, corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by LHCb at $\sqrt{s}=7$ and 8 TeV, is used to reconstruct $63\pm9$ $Ω_b^-\toΩ_c^0π^-$, $Ω_c^0\to pK^-K^-π^+$ decays. Using the $Ξ_b^-\toΞ_c^0π^-$, $Ξ_c^0\to pK^-K^-π^+$ decay mode for calibration, the lifetime ratio and absolute lifetime of the $Ω_b^-$ baryon are measured to be \begin{align*} \frac{τ_{Ω_b^-}}{τ_{Ξ_b^-}} &= 1.11\pm0.16\pm0.03, \\ τ_{Ω_b^-} &= 1.78\pm0.26\pm0.05\pm0.06~{\rm ps}, \end{align*} where the uncertainties are statistical, systematic and from the calibration mode (for $τ_{Ω_b^-}$ only). A measurement is also made of the mass difference, $m_{Ω_b^-}-m_{Ξ_b^-}$, and the corresponding $Ω_b^-$ mass, which yields \begin{align*} m_{Ω_b^-}-m_{Ξ_b^-} &= 247.4\pm3.2\pm0.5~{\rm MeV}/c^2, \\ m_{Ω_b^-} &= 6045.1\pm3.2\pm 0.5\pm0.6~{\rm MeV}/c^2. \end{align*} These results are consistent with previous measurements.

hep-ex↗

arXiv2016

Measurement of the difference of time-integrated CP asymmetries in $D^0 \rightarrow K^{-} K^{+} $ and $D^0 \rightarrow π^{-} π^{+} $ decays

A search for CP violation in $D^0 \rightarrow K^{-} K^{+} $ and $D^0 \rightarrow π^{-} π^{+} $ decays is performed using $pp$ collision data, corresponding to an integrated luminosity of $3~fb^{-1}$, collected using the LHCb detector at centre-of-mass energies of 7 and $8~$TeV. The flavour of the charm meson is inferred from the charge of the pion in $D^{*+}\rightarrow D^0π^+$ and $D^{*-}\rightarrow \bar{D^0}π^{-}$ decays. The difference between the CP asymmetries in $D^0 \rightarrow K^{-} K^{+} $ and $D^0 \rightarrow π^{-} π^{+} $ decays, $ΔA_{CP} \equiv A_{CP}(K^{-} K^{+}) - A_{CP}(π^{-} π^{+})$, is measured to be $\left( -0.10 \pm 0.08(stat) \pm 0.03(syst) \right) \%$. This is the most precise measurement of a time-integrated CP asymmetry in the charm sector from a single experiment.

hep-ex↗

arXiv2016

Observation of $B^0_s\to\bar{D}^0 K^0_S$ and evidence for $B^0_s\to\bar{D}^{*0} K^0_S$ decays

The first observation of the $B^0_s\to\bar{D}^0 K^0_S$ decay mode and evidence for the $B^0_s\to\bar{D}^{*0} K^0_S$ decay mode are reported. The data sample corresponds to an integrated luminosity of 3.0 $\text{fb}^{-1}$ collected in $pp$ collisions by LHCb at center-of-mass energies of 7 and 8 TeV. The branching fractions are measured to be \begin{align*} \mathcal{B}(B^0_s\to\bar{D}^0 \bar{K}^0) &= (4.3\pm0.5(\text{stat})\pm0.3(\text{syst})\pm0.3(\text{frag})\pm0.6(\text{norm}))\times10^{-4},\\ \mathcal{B}(B^0_s\to\bar{D}^{*0} \bar{K}^0) &= (2.8\pm1.0(\text{stat})\pm0.3(\text{syst})\pm0.2(\text{frag})\pm0.4(\text{norm}))\times10^{-4}, \end{align*} where the uncertainties are due to contributions coming from statistical precision, systematic effects, and the precision of two external inputs, the ratio $f_s/f_d$ and the branching fraction of $B^0\to\bar{D}^0 K^0_S$, which is used as a calibration channel.

hep-ex↗

arXiv2016

Observation of the $B_s^0 \rightarrow J/ψϕϕ$ decay

The $B_s^0 \rightarrow J/ψϕϕ$ decay is observed in $pp$ collision data corresponding to an integrated luminosity of 3 fb$^{-1}$ recorded by the LHCb detector at centre-of-mass energies of 7 TeV and 8 TeV. This is the first observation of this decay channel, with a statistical significance of 15 standard deviations. The mass of the $B_s^0$ meson is measured to be $5367.08\,\pm \,0.38\,\pm\, 0.15$ MeV/c$^2$. The branching fraction ratio $\mathcal{B}(B_s^0 \rightarrow J/ψϕϕ)/\mathcal{B}(B_s^0 \rightarrow J/ψϕ)$ is measured to be $0.0115\,\pm\, 0.0012\, ^{+0.0005}_{-0.0009}$. In both cases, the first uncertainty is statistical and the second is systematic. No evidence for non-resonant $B_s^0 \rightarrow J/ψϕK^+ K^-$ or $B_s^0 \rightarrow J/ψK^+ K^- K^+ K^-$ decays is found.

hep-ex↗

arXiv2016

Model-independent evidence for $J/ψp$ contributions to $Λ_b^0\to J/ψp K^-$ decays

The data sample of $Λ_b^0\to J/ψp K^-$ decays acquired with the LHCb detector from 7 and 8~TeV $pp$ collisions, corresponding to an integrated luminosity of 3 fb$^{-1}$, is inspected for the presence of $J/ψp$ or $J/ψK^-$ contributions with minimal assumptions about $K^- p$ contributions. It is demonstrated at more than 9 standard deviations that $Λ_b^0\to J/ψp K^-$ decays cannot be described with $K^- p$ contributions alone, and that $J/ψp$ contributions play a dominant role in this incompatibility. These model-independent results support the previously obtained model-dependent evidence for $P_c^+\to J/ψp$ charmonium-pentaquark states in the same data sample.

hep-ex↗

arXiv2016

Model-independent measurement of mixing parameters in $D^0 \to K_S π^+ π^-$ decays

The first model-independent measurement of the charm mixing parameters in the decay $D^0 \to K_S π^+ π^-$ is reported, using a sample of $pp$ collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 1.0 fb$^{-1}$ at a centre-of-mass energy of 7 TeV. The measured values are \begin{eqnarray*} x &=& (-0.86 \pm 0.53 \pm 0.17) \times 10^{-2}, \\ y &=& (+0.03 \pm 0.46 \pm 0.13) \times 10^{-2}, \end{eqnarray*} where the first uncertainties are statistical and include small contributions due to the external input for the strong phase measured by the CLEO collaboration, and the second uncertainties are systematic.

hep-ex↗

arXiv2016

Studies of the resonance structure in $D^0\to K^0_S K^{\pm}π^{\mp}$ decays

Amplitude models are applied to studies of resonance structure in $D^0\to K^0_S K^- π^+$ and $D^0\to K^0_S K^+ π^-$ decays using $pp$ collision data corresponding to an integrated luminosity of $3.0\,\mathrm{fb}^{-1}$ collected by the LHCb experiment. Relative magnitude and phase information is determined, and coherence factors and related observables are computed for both the whole phase space and a restricted region of $100\,\mathrm{MeV/}c^2$ around the $K^{*}(892)^{\pm}$ resonance. Two formulations for the $Kπ$ $S$-wave are used, both of which give a good description of the data. The ratio of branching fractions $\mathcal{B}(D^0\to K^0_S K^+ π^-)/\mathcal{B}(D^0\to K^0_S K^- π^+)$ is measured to be $0.655\pm0.004\,(\textrm{stat})\pm0.006\,(\textrm{syst})$ over the full phase space and $0.370\pm0.003\, (\textrm{stat})\pm0.012\,(\textrm{syst})$ in the restricted region. A search for $CP$ violation is performed using the amplitude models and no significant effect is found. Predictions from $SU(3)$ flavor symmetry for $K^{*}(892)K$ amplitudes of different charges are compared with the amplitude model results.

hep-ex↗

arXiv2016

Angular analysis of the $B^{0}\rightarrow K^{*0}μ^{+}μ^{-}$ decay using $3\,\mbox{fb}^{-1}$ of integrated luminosity

An angular analysis of the $B^{0}\rightarrow K^{*0}(\rightarrow K^{+}π^{-})μ^{+}μ^{-}$ decay is presented. The dataset corresponds to an integrated luminosity of $3.0\,{\mbox{fb}^{-1}}$ of $pp$ collision data collected at the LHCb experiment. The complete angular information from the decay is used to determine $C\!P$-averaged observables and $C\!P$ asymmetries, taking account of possible contamination from decays with the $K^{+}π^{-}$ system in an S-wave configuration. The angular observables and their correlations are reported in bins of $q^2$, the invariant mass squared of the dimuon system. The observables are determined both from an unbinned maximum likelihood fit and by using the principal moments of the angular distribution. In addition, by fitting for $q^2$-dependent decay amplitudes in the region $1.1<q^{2}<6.0\mathrm{\,Ge\kern -0.1em V}^{2}/c^{4}$, the zero-crossing points of several angular observables are computed. A global fit is performed to the complete set of $C\!P$-averaged observables obtained from the maximum likelihood fit. This fit indicates differences with predictions based on the Standard Model at the level of 3.4 standard deviations. These differences could be explained by contributions from physics beyond the Standard Model, or by an unexpectedly large hadronic effect that is not accounted for in the Standard Model predictions.

hep-ex↗

arXiv2016

A model-independent confirmation of the $Z(4430)^-$ state

The decay $B^0\to ψ(2S) K^+π^-$ is analyzed using $\rm 3~fb^{-1}$ of $pp$ collision data collected with the LHCb detector. A model-independent description of the $ψ(2S) π$ mass spectrum is obtained, using as input the $Kπ$ mass spectrum and angular distribution derived directly from data, without requiring a theoretical description of resonance shapes or their interference. The hypothesis that the $ψ(2S)π$ mass spectrum can be described in terms of $Kπ$ reflections alone is rejected with more than 8$σ$ significance. This provides confirmation, in a model-independent way, of the need for an additional resonant component in the mass region of the $Z(4430)^-$ exotic state.

hep-ex↗

arXiv2016

Study of $D^{()+}_{sJ}$ mesons decaying to $D^{+} K^0_{\rm S}$ and $D^{*0} K^+$ final states

A search is performed for $D^{(*)+}_{sJ}$ mesons in the reactions $pp \to D^{*+} K^0_{\rm S} X$ and $pp \to D^{*0} K^+ X$ using data collected at centre-of-mass energies of 7 and 8 TeV with the LHCb detector. For the $D^{*+} K^0_{\rm S}$ final state, the decays $D^{*+} \to D^0 π^+$ with $D^0 \to K^- π^+$ and $D^0 \to K^- π^+ π^+ π^-$ are used. For $D^{*0} K^+$, the decay $D^{*0} \to D^0 π^0$ with $D^0 \to K^- π^+$ is used. A prominent $D_{s1}(2536)^+$ signal is observed in both $D^{*+} K^0_{\rm S}$ and $D^{*0} K^+$ final states. The resonances $D^*_{s1}(2700)^+$ and $D^*_{s3}(2860)^+$ are also observed, yielding information on their properties, including spin-parity assignments. The decay $D^*_{s2}(2573)^+ \to D^{*+} K^0_{\rm S}$ is observed for the first time, at a significance of 6.9 $σ$, and its branching fraction relative to the $D^*_{s2}(2573)^+ \to D^+ K^0_{\rm S}$ decay mode is measured.

hep-ex↗

arXiv2016

Measurement of forward $W$ and $Z$ boson production in $pp$ collisions at $\sqrt{s} = 8\mathrm{\,Te\kern -0.1em V}$

Measurements are presented of electroweak boson production using data from $pp$ collisions at a centre-of-mass energy of $\sqrt{s} = 8\mathrm{\,Te\kern -0.1em V}$. The analysis is based on an integrated luminosity of $2.0\mathrm{\,fb}^{-1}$ recorded with the LHCb detector. The bosons are identified in the $W\rightarrowμν$ and $Z\rightarrowμ^{+}μ^{-}$ decay channels. The cross-sections are measured for muons in the pseudorapidity range $2.0 < η< 4.5$, with transverse momenta $p_{\rm T} > 20{\mathrm{\,Ge\kern -0.1em V\!/}c}$ and, in the case of the $Z$ boson, a dimuon mass within $60 < M_{μ^{+}μ^{-}} < 120{\mathrm{\,Ge\kern -0.1em V\!/}c^{2}}$. The results are \begin{align*} σ_{W^{+}\rightarrowμ^{+}ν} &= 1093.6 \pm 2.1 \pm 7.2 \pm 10.9 \pm 12.7{\rm \,pb} \, , σ_{W^{-}\rightarrowμ^{-}\barν} &= \phantom{0}818.4 \pm 1.9 \pm 5.0 \pm \phantom{0}7.0 \pm \phantom{0}9.5{\rm \,pb} \, , σ_{Z\rightarrowμ^{+}μ^{-}} &= \phantom{00}95.0 \pm 0.3 \pm 0.7 \pm \phantom{0}1.1 \pm \phantom{0}1.1{\rm \,pb} \, , \end{align*} where the first uncertainties are statistical, the second are systematic, the third are due to the knowledge of the LHC beam energy and the fourth are due to the luminosity determination. The evolution of the $W$ and $Z$ boson cross-sections with centre-of-mass energy is studied using previously reported measurements with $1.0\mathrm{\,fb}^{-1}$ of data at $7\mathrm{\,Te\kern -0.1em V}$. Differential distributions are also presented. Results are in good agreement with theoretical predictions at next-to-next-to-leading order in perturbative quantum chromodynamics.

hep-ex↗

arXiv2016

Study of $ψ(2S)$ production and cold nuclear matter effects in pPb collisions at $\sqrt{s_{NN}}=5~\mathrm{TeV}$

The production of $ψ(2S)$ mesons is studied in dimuon final states using proton-lead collision data collected by the LHCb detector. The data sample corresponds to an integrated luminosity of $1.6~\mathrm{nb}^{-1}$. The nucleon-nucleon centre-of-mass energy of the proton-lead collisions is $\sqrt{s_{NN}}=5~\mathrm{TeV}$. The measurement is performed using $ψ(2S)$ mesons with transverse momentum less than $14~\mathrm{GeV}/c$ and rapidity $y$ in the ranges $1.5<y<4.0$ and $-5.0<y<-2.5$ in the nucleon-nucleon centre-of-mass system. The forward-backward production ratio and the nuclear modification factor are determined for $ψ(2S)$ mesons. Using the production cross-section results of $ψ(2S)$ and $J/ψ$ mesons from $b$-hadron decays, the $b\bar{b}$ cross-section in pPb collisions at $\sqrt{s_{NN}}=5~\mathrm{TeV}$ is obtained.

nucl-ex↗

arXiv2016

Search for the lepton-flavour violating decay $D^0 \to e^\pmμ^\mp$

A search for the lepton-flavour violating decay $D^0 \to e^\pm μ^\mp$ is made with a dataset corresponding to an integrated luminosity of 3.0 fb$^{-1}$ of proton-proton collisions at centre-of-mass energies of $7$ TeV and $8$ TeV, collected by the LHCb experiment. Candidate $D^0$ mesons are selected using the decay $D^{*+} \to D^0 π^+$ and the $D^0 \to e^\pm μ^\mp$ branching fraction is measured using the decay mode $D^0 \to K^-π^+$ as a normalisation channel. No significant excess of $D^0 \to e^\pm μ^\mp$ candidates over the expected background is seen, and a limit is set on the branching fraction, $\mathcal{B}(D^0 \to e^\pm μ^\mp) < 1.3 \times 10^{-8}$, at 90 % confidence level. This is an order of magnitude lower than the previous limit and it further constrains the parameter space in some leptoquark models and in supersymmetric models with R-parity violation.

hep-ex↗