arXiv subjects

G. Busetto

Publications and source records attributed to G. Busetto.

At least 163 records · Page 9Linked to original sources

arXiv2014

Observation of the resonant character of the $Z(4430)^-$ state

Resonant structures in $B^0\toψ'π^-K^+$ decays are analyzed by performing a four-dimensional fit of the decay amplitude, using $pp$ collision data corresponding to $\rm 3 fb^{-1}$ collected with the LHCb detector. The data cannot be described with $K^+π^-$ resonances alone, which is confirmed with a model-independent approach. A highly significant $Z(4430)^-\toψ'π^-$ component is required, thus confirming the existence of this state. The observed evolution of the $Z(4430)^-$ amplitude with the $ψ'π^-$ mass establishes the resonant nature of this particle. The mass and width measurements are substantially improved. The spin-parity is determined unambiguously to be $1^+$.

hep-ex↗

arXiv2014

Evidence for the decay $B_c^+ \rightarrow J/ψ3π^+ 2π^-$

Evidence is presented for the decay $B_c+\rightarrow J/ψ3π^+2π^-$ using proton-proton collision data, corresponding to an integrated luminosity of 3fb$^{-1}$, collected with the LHCb detector. A signal yield of $32\pm8$ decays is found with a significance of 4.5 standard deviations. The ratio of the branching fraction of the $B_c^+\rightarrow J/ψ3π^+ 2π^-$ decay to that of the $B_c^+ \rightarrow J/ψπ^+$ decay is measured to be $$ \frac{Br (B_c^+ \rightarrow J/ψ3π^+2π^)}{Br (B_c^+ \rightarrow J/ψπ^+)} = 1.74\pm0.44\pm0.24, $$ where the first uncertainty is statistical and the second is systematic.

hep-ex↗

arXiv2014

Evidence for the decay $X(3872)\rightarrowψ(2S)γ$

Evidence for the decay mode $X(3872)\rightarrowψ(2S)γ$ in $B^+\rightarrow X(3872)K^+$ decays is found with a significance of 4.4 standard deviations. The analysis is based on a data sample of proton-proton collisions, corresponding to an integrated luminosity of 3fb$^{-1}$ collected with the LHCb detector, at centre-of-mass energies of 7 and 8TeV. The ratio of the branching fraction of the $X(3872)\toψ(2S)γ$ decay to that of the $X(3872)\rightarrow J/ψγ$ decay is measured to be $$ \frac{Br(X(3872)\rightarrowψ(2S)γ)}{Br(X(3872)\rightarrow J/ψγ)} = 2.46\pm0.64\pm0.29, %\pm0.06,$$ where the first uncertainty is statistical and the second is systematic. The measured value agrees with expectations for a pure charmonium interpretation of the $X(3872)$ state and a mixture of charmonium and molecular interpretations. However, it does not support a pure $D\bar{D}^{*}$ molecular interpretation of the $X(3872)$state.

hep-ex↗

arXiv2014

Mass and lifetime measurements of bottom and charm baryons in $p\bar p$ collisions at $\sqrt{s}= 1.96 TeV

We report on mass and lifetime measurements of several ground state charmed and bottom baryons, using a data sample corresponding to 9.6 $\textrm{fb}^{-1}$ from $p\bar p$ collisions at $\sqrt{s}=1.96$ TeV, and recorded with the Collider Detector at Fermilab. Baryon candidates are reconstructed from data collected with an online event selection designed for the collection of long-lifetime heavy-flavor decay products and a second event selection designed to collect $J/ψ\rightarrow μ^+ \, μ^-$ candidates. First evidence for the process $Ω_b^- \rightarrow Ω_c^0 \, π^-$ is presented with a significance of $3.3σ$. We measure the following baryon masses: \begin{eqnarray} M(Ξ_c^{0}) = 2470.85\pm0.24(stat)\pm0.55(syst) \, MeV/c^2, \nonumber M(Ξ_c^{+}) = 2468.00\pm0.18(stat)\pm0.51(syst) \, MeV/c^2, \nonumber \\ M(Λ_b) = 5620.15\pm0.31(stat)\pm0.47(syst) \, MeV/c^2, \nonumber \\ M(Ξ_b^-) = 5793.4\pm1.8(stat)\pm0.7(syst) \, MeV/c^2, \nonumber \\ M(Ξ_b^0) = 5788.7\pm4.3(stat)\pm1.4(syst) \, MeV/c^2, \, and \nonumber \\ M(Ω_b^-) = 6047.5\pm3.8(stat)\pm0.6(syst) \, MeV/c^2. \nonumber \end{eqnarray} The isospin splitting of the $Ξ_b^{-,0}$ states is found to be $M(Ξ_b^-)-M(Ξ_b^0)=4.7\pm4.7(stat)\pm0.7(syst)$ MeV/$c^2$. The isospin splitting of the $Ξ_c^{0,+}$ states is found to be $M(Ξ_c^0)-M(Ξ_c^+)$ = $2.85\pm0.30(stat)\pm0.04(syst)$ MeV/$c^2$. The following lifetime measurements are made: \begin{eqnarray} τ(Λ_b) = 1.565\pm0.035(stat)\pm0.020(syst) \, ps, \nonumber \\ τ(Ξ_b^-) = 1.32\pm0.14(stat)\pm0.02(syst) \, ps, \nonumber \\ τ(Ω_b^-) = 1.66^{+0.53}_{-0.40}(stat)\pm0.02(syst) \, ps. \nonumber \end{eqnarray}

hep-ex↗

arXiv2014

Study of $J/ψ$ production and cold nuclear matter effects in $p$Pb collisions at $\sqrt{s_{NN}}=5 \mathrm{TeV}$

The production of $J/ψ$ mesons with rapidity $1.5<y<4.0$ or $-5.0<y<-2.5$ and transverse momentum $p_\mathrm{T}<14 \mathrm{GeV}/c$ is studied with the LHCb detector in proton-lead collisions at a nucleon-nucleon centre-of-mass energy $\sqrt{s_{NN}}=5 \mathrm{TeV}$. The analysis is based on a data sample corresponding to an integrated luminosity of about $1.6 \mathrm{nb}^{-1}$. For the first time the nuclear modification factor and forward-backward production ratio are determined separately for prompt $J/ψ$ mesons and $J/ψ$ from $b$-hadron decays. Clear suppression of prompt $J/ψ$ production with respect to proton-proton collisions at large rapidity is observed, while the production of $J/ψ$ from $b$-hadron decays is less suppressed. These results show good agreement with available theoretical predictions. The measurement shows that cold nuclear matter effects are important for interpretations of the related quark-gluon plasma signatures in heavy-ion collisions.

nucl-ex↗

arXiv2014

First Search for Exotic Z Boson Decays into Photons and Neutral Pions in Hadron Collisions

A search for forbidden and exotic Z boson decays in the diphoton mass spectrum is presented for the first time in hadron collisions, based on data corresponding to 10.0 fb^-1 of integrated luminosity from proton-antiproton collisions at sqrt(s) = 1.96 TeV collected by the CDF experiment. No evidence of signal is observed, and 95% credibility level Bayesian upper limits are set on the branching ratios of decays of the Z boson to a photon and neutral pion (which is detected as a photon), a pair of photons, and a pair of neutral pions. The observed branching ratio limits are 2.01 x 10^-5 for Z to π^0γ, 1.46 x 10^-5 for Z to γγ, and 1.52 x 10^-5 for Z to π^0π^0. The Z to π^0γ and Z to γγ limits improve by factors of 2.6 and 3.6, respectively, the most stringent results from other experiments. The Z to π^0π^0 branching ratio limit is the first experimental result on this decay.

hep-ex↗

arXiv2014

Measurements of the $B^+$, $B^0$, $B_s^0$ meson and $Λ_b^0$ baryon lifetimes

Measurements of $b$-hadron lifetimes are reported using $pp$ collision data, corresponding to an integrated luminosity of 1.0fb$^{-1}$, collected by the LHCb detector at a centre-of-mass energy of $7$Tev. Using the exclusive decays $B^+\to J/ψK^+$, $B^0\to J/ψK^*(892)^0$, $B^0\to J/ψK^0_{\rm S}$, $Λ_b^0\to J/ψΛ$ and $B^0_s\to J/ψϕ$ the average decay times in these modes are measured to be $τ_{B^+\to J/ψK^+}$ = $1.637 \pm$ 0.004 $\pm$ 0.003 ps, $τ_{B^0\to J/ψK^*(892)^0}$ = $1.524 \pm$ 0.006 $\pm$ 0.004 ps, $τ_{B^0\to J/ψK^0_{\rm S}}$ = $1.499 \pm$ 0.013 $\pm$ 0.005 ps, $τ_{Λ_b^0\to J/ψΛ}$ = $1.415 \pm$ 0.027 $\pm$ 0.006 ps and $τ_{B^0_s\to J/ψϕ}$ = $1.480 \pm$ 0.011 $\pm$ 0.005 ps, where the first uncertainty is statistical and the second is systematic. These represent the most precise lifetime measurements in these decay modes. In addition, ratios of these lifetimes, and the ratio of the decay-width difference, $ΔΓ_d$, to the average width, $Γ_d$, in the $B^0$ system, $ΔΓ_d/Γ_d = -0.044 \pm 0.025 \pm 0.011$, are reported. All quantities are found to be consistent with Standard Model expectations.

hep-ex↗

arXiv2014

Study of beauty hadron decays into pairs of charm hadrons

First observations of the decays $Λ_b^0 \to Λ_c^+ D_{(s)}^-$ are reported using data corresponding to an integrated luminosity of $3\,{\rm fb}^{-1}$ collected at 7 and 8 TeV center-of-mass energy in proton-proton collisions with the LHCb detector. In addition, the most precise measurement of the branching fraction ${\mathcal{B}(B_s^0 \to D^+D_s^-)}$ is made and a search is performed for the decays $B^0_{(s)} \to Λ_c^+ Λ_c^-$. The results obtained are \begin{eqnarray*} \mathcal{B}(Λ_b^0 \to Λ_c^+ D^-)/\mathcal{B}(Λ_b^0 \to Λ_c^+ D_{s}^-) &=& 0.042 \pm 0.003({\rm stat}) \pm 0.003({\rm syst}), \left[\frac{\mathcal{B}(Λ_b^0 \to Λ_c^+ D_{s}^-)}{\mathcal{B}({\kern 0.2em}\overline{\kern -0.2em B}_d^0 \to D^+D_s^-)}\right]\big/\left[\frac{\mathcal{B}(Λ_b^0 \to Λ_c^+π^-)}{\mathcal{B}({\kern 0.2em}\overline{\kern -0.2em B}_d^0 \to D^+π^-)}\right] &=& 0.96 \pm 0.02({\rm stat}) \pm 0.06({\rm syst}), \mathcal{B}(B_s^0 \to D^+D_s^-)/\mathcal{B}({\kern 0.2em}\overline{\kern -0.2em B}_d^0 \to D^+D_s^-) &=& 0.038\pm0.004({\rm stat})\pm0.003({\rm syst}), \mathcal{B}({\kern 0.2em}\overline{\kern -0.2em B}^0 \to Λ_c^+ Λ_c^-)/\mathcal{B}({\kern 0.2em}\overline{\kern -0.2em B}_d^0 \to D^+D_s^-) & < & 0.0022\; [95\% \; {\rm C.L.}], \mathcal{B}(B^0_{s} \to Λ_c^+ Λ_c^-)/\mathcal{B}(B_s^0 \to D^+D_s^-) & < & 0.30\; [95\% \; {\rm C.L.}]. \end{eqnarray*} Measurement of the mass of the $Λ_b^0$ baryon relative to the $B^0$ meson gives ${M(Λ_b^0) -M(B^0) = 339.72\pm 0.24({\rm stat}) \pm 0.18({\rm syst})}$ MeV$/c^2$. This result provides the most precise measurement of the mass of the $Λ_b^0$ baryon to date.

hep-ex↗

arXiv2014

Measurement of polarization amplitudes and CP asymmetries in $B^0 \to ϕK^*(892)^0$

An angular analysis of the decay $B^0 \to ϕK^*(892)^0$ is reported based on a $pp$ collision data sample, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected at a centre-of-mass energy of $\sqrt{s} = 7$ TeV with the LHCb detector. The P-wave amplitudes and phases are measured with a greater precision than by previous experiments, and confirm about equal amounts of longitudinal and transverse polarization. The S-wave $K^+ π^-$ and $K^+K^-$ contributions are taken into account and found to be significant. A comparison of the $B^0 \to ϕK^*(892)^0$ and $\bar{B}^0 \to ϕ\bar{K}^*(892)^0$ results shows no evidence for direct CP violation in the rate asymmetry, in the triple-product asymmetries or in the polarization amplitudes and phases.

hep-ex↗

arXiv2014

Measurement of $ψ(2S)$ polarisation in $pp$ collisions at $\sqrt{s}=7$ TeV

The polarisation of prompt $ψ(2S)$ mesons is measured by performing an angular analysis of $ψ(2S)\rightarrow μ^{+} μ^{-}$ decays using proton-proton collision data, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected by the LHCb detector at a centre-of-mass energy of 7 TeV. The polarisation is measured in bins of transverse momentum $p_\mathrm{T}$ and rapidity $y$ in the kinematic region $3.5<p_\mathrm{T}<15$ GeV$/c$ and $2.0<y<4.5$, and is compared to theoretical models. No significant polarisation is observed.

hep-ex↗

arXiv2014

Search for Majorana neutrinos in $B^- \to π^+μ^-μ^-$ decays

A search for heavy Majorana neutrinos produced in the $B^- \to π^+μ^-μ^-$ decay mode is performed using 3 fb$^{-1}$ of integrated luminosity collected with the LHCb detector in $pp$ collisions at center-of-mass energies of 7 TeV and 8 TeV at the LHC. Neutrinos with masses in the range 250-5000 MeV and lifetimes from zero to 1000 ps are probed. In the absence of a signal, upper limits are set on the branching fraction ${\cal{B}}(B^- \to π^+μ^-μ^-)$ as functions of neutrino mass and lifetime. These limits are on the order of $10^{-9}$ for short neutrino lifetimes of 1 ps or less. Limits are also set on the coupling between the muon and a possible fourth-generation neutrino.

hep-ex↗

arXiv2014

Indirect measurement of $\sin^2 θ_W$ (or $M_W$) using $μ^+μ^-$ pairs from $γ^*/Z$ bosons produced in $p\bar{p}$ collisions at a center-of-momentum energy of 1.96 TeV

Drell-Yan lepton pairs are produced in the process $p\bar{p} \rightarrow μ^+μ^- + X$ through an intermediate $γ^*/Z$ boson. The forward-backward asymmetry in the polar-angle distribution of the $μ^-$ as a function of the invariant mass of the $μ^+μ^-$ pair is used to obtain the effective leptonic determination $\sin^2 θ^{lept}_{eff}$ of the electroweak-mixing parameter $\sin^2 θ_W$, from which the value of $\sin^2 θ_W$ is derived assuming the standard model. The measurement sample, recorded by the Collider Detector at Fermilab (CDF), corresponds to 9.2 fb-1 of integrated luminosity from $p\bar{p}$ collisions at a center-of-momentum energy of 1.96 TeV, and is the full CDF Run II data set. The value of $\sin^2 θ^{lept}_{eff}$ is found to be 0.2315 +- 0.0010, where statistical and systematic uncertainties are combined in quadrature. When interpreted within the context of the standard model using the on-shell renormalization scheme, where $\sin^2 θ_W = 1 - M_W^2/M_Z^2$, the measurement yields $\sin^2 θ_W$ = 0.2233 +- 0.0009, or equivalently a W-boson mass of 80.365 +- 0.047 GeV/c^2. The value of the W-boson mass is in agreement with previous determinations in electron-positron collisions and at the Tevatron collider.

hep-ex↗

arXiv2014

Measurement of resonant and $CP$ components in $\overline{B}_s^0\rightarrow J/ψπ^+π^-$ decays

The resonant structure of the decay $\overline{B}_s^0\to J/ψπ^+π^-$ is studied using data corresponding to 3 fb$^{-1}$ of integrated luminosity from $pp$ collisions by the LHC and collected by the LHCb detector. Five interfering $π^+π^-$ states are required to describe the decay: $f_0(980),f_0(1500),f_0(1790),f_2(1270)$, and $f_2^{\prime}(1525)$. An alternative model including these states and a non-resonant $J/ψπ^+π^-$ component also provides a good description of the data. Based on the different transversity components measured for the spin-2 intermediate states, the final state is found to be compatible with being entirely $CP$-odd. The $CP$-even part is found to be $<2.3$% at 95% confidence level. The $f_0(500)$ state is not observed, allowing a limit to be set on the absolute value of the mixing angle with the $f_0(980)$ of $<7.7^{\circ}$ at 90% confidence level, consistent with a tetraquark interpretation of the $f_0(980)$ substructure.

hep-ex↗

arXiv2014

Search for $s$-channel Single Top Quark Production in the Missing Energy Plus Jets Sample using the Full CDF II Data Set

The first search for single top quark production from the exchange of an $s$-channel virtual $W$ boson using events with an imbalance in the total transverse momentum, $b$-tagged jets, and no identified leptons is presented. The full data set collected by the Collider Detector at Fermilab, corresponding to an integrated luminosity of 9.45 fb$^{-1}$ from Fermilab Tevatron proton-antiproton collisions at a center of mass energy of 1.96 TeV, is used. Assuming the electroweak production of top quarks of mass 172.5 GeV/$c^2$ in the $s$-channel, a cross section of $1.12_{-0.57}^{+0.61}$ (stat+syst) pb, with a significance of 1.9 standard deviations, is measured. This measurement is combined with a previous result obtained from events with an imbalance in total transverse momentum, $b$-tagged jets, and exactly one identified lepton, yielding a cross section of $1.36_{-0.32}^{+0.37}$ (stat+syst) pb, with a significance of 4.2 standard deviations.

hep-ex↗

arXiv2014

Searches for $B^{0}_{(s)} \rightarrow J/ψ p \overline{p}$ and $B^{+} \to J/ψ p \overline{p} π^{+}$ decays

The results of searches for $B^{0}_{(s)} \rightarrow J/ψ p \overline{p}$ and $B^{+} \to J/ψ p \overline{p} π^{+}$ decays are reported. The analysis is based on a data sample, corresponding to an integrated luminosity of 1.0 fb$^{-1}$ of $pp$ collisions, collected with the LHCb detector. An excess with 2.8$\,σ$ significance is seen for the decay $B^{0}_{s} \to J/ψ p \overline{p}$ and an upper limit on the branching fraction is set at the 90 % confidence level: ${\cal B}(B^{0}_{s} \to J/ψ p \overline{p}) < 4.8 \times 10^{-6}$, which is the first such limit. No significant signals are seen for $B^{0} \to J/ψ p \overline{p}$ and $B^{+} \to J/ψ p \overline{p} π^{+}$ decays, for which the corresponding limits are set: ${\cal{B}}(B^{0} \to J/ψ p \overline{p}) < 5.2 \times 10^{-7}$, which significantly improves the existing limit; and ${\cal{B}}(B^{+} \to J/ψ p \overline{p} π^{+}) < 5.0 \times 10^{-7}$, which is the first limit on this branching fraction.

hep-ex↗

arXiv2014

Measurements of indirect CP asymmetries in $D^0\to K^-K^+$ and $D^0\toπ^-π^+$ decays

A study of indirect CP violation in $D^0$ mesons through the determination of the parameter $A_Γ$ is presented using a data sample of $pp$ collisions, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected with the LHCb detector and recorded at the centre-of-mass energy of 7 TeV at the LHC. The parameter $A_Γ$ is the asymmetry of the effective lifetimes measured in decays of $D^0$ and $\bar{D}^0$ mesons to the CP eigenstates $K^-K^+$ and $π^-π^+$. Fits to the data sample yield $A_Γ(KK)=(-0.35\pm0.62\pm0.12)\times 10^{-3}$ and $A_Γ(ππ)=(0.33\pm1.06\pm0.14)\times 10^{-3}$, where the first uncertainties are statistical and the second systematic. The results represent the world's best measurements of these quantities. They show no difference in $A_Γ$ between the two final states and no indication of CP violation.

hep-ex↗

arXiv2014

Measurement of the $B_c^+$ meson lifetime using $B_c^+ \to J\!/\!ψμ^+ ν_μ X$ decays

The lifetime of the $B_c^+$ meson is measured using semileptonic decays having a $J\!/\!ψ$ meson and a muon in the final state. The data, corresponding to an integrated luminosity of $2\mathrm{~fb^{-1}}$, are collected by the LHCb detector in $pp$ collisions at a centre-of-mass energy of $8\,\mathrm{TeV}$. The measured lifetime is $$τ= 509 \pm 8 \pm 12 \mathrm{~fs},$$ where the first uncertainty is statistical and the second is systematic.

hep-ex↗

arXiv2014

Updated measurements of exclusive $J/ψ$ and $ψ(2S)$ production cross-sections in $pp$ collisions at $\sqrt{s}=7$ TeV

The differential cross-section as a function of rapidity has been measured for the exclusive production of $J/ψ$ and $ψ(2S)$ mesons in proton-proton collisions at $\sqrt{s}=7$ TeV, using data collected by the LHCb experiment, corresponding to an integrated luminosity of 930 pb$^{-1}$. The cross-sections times branching fractions to two muons having pseudorapidities between 2.0 and 4.5 are measured to be $$\begin{array}{rl} σ_{pp\rightarrow J/ψ\rightarrow{μ^+}{μ^-}}(2.0<η_{μ^\pm }<4.5)=&291\pm 7\pm19 {\rm \ pb},\\ σ_{pp\rightarrowψ(2S)\rightarrow{μ^+}{μ^-}}(2.0<η_{μ^\pm}<4.5)=&6.5\pm 0.9\pm 0.4 {\rm \ pb},\end{array}$$ where the first uncertainty is statistical and the second is systematic. The measurements agree with next-to-leading order QCD predictions as well as with models that include saturation effects.

hep-ex↗