Hasil untuk "Economics as a science"

Bo Zhu, Yufei Zhang, Xiru Li et al.

Given the strong interdependencies between the economic and financial systems, nonfinancial firms have a significant impact on systemic risk. In this scenario, we examine the influence of bank liquidity hoarding on risk spillovers of nonfinancial firms, as it can impact firms' financing environment and operational conditions. Using data from 118 publicly listed Chinese companies between 2008 and 2021, we find that bank liquidity hoarding increases nonfinancial firms' risk spillovers, especially in the manufacturing and real estate industries. Furthermore, the path analysis results show that bank liquidity hoarding exacerbates extreme risk spillovers by increasing financing costs and intensifying corporate maturity mismatches. Moreover, the effect of bank liquidity hoarding is mitigated in firms with higher profitability and lower corporate financialization. This research bolsters the efficacy of macroprudential policies aimed at managing systemic risks amplified by bank liquidity hoarding within the financial and economic systems.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

An amplitude analysis of the $Ξ^+_c\to pK^-π^+$ decay together with a measurement of the $Ξ^+_c$ polarization vector in semileptonic beauty-hadron decays is presented. The analysis is performed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 ${\rm fb}^{-1}$. An amplitude model is developed and the resonance fractions as well as two- and three-body decay parameters are reported. A sizeable $Ξ^+_c$ polarization is found. A large sensitivity of the $Ξ^+_c\to pK^-π^+$ decay to the polarization is seen, making the amplitude model suitable for $Ξ^+_c$ polarization measurements in other systems.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

The study of a wide peaking structure in the $B_{c}^{+} γ$ mass spectrum is reported using a data sample of proton-proton collisions collected by the LHCb detector at center-of-mass energies of $7$, $8$, and $13~\text{TeV}$, corresponding to an integrated luminosity of $9~\text{fb}^{-1}$. The observed structure is consistent with the lowest excited $P$-wave $B_{c}^{+}$ states and exhibits a statistical significance exceeding seven standard deviations relative to the background-only hypothesis. A two-peak model serves as an effective description of the data, with various theory-constrained models further explored to provide physical interpretation. Based on the predictions for the $B_{c}(1P)^{+}$ spectrum, the relative production cross-section of the overall $B_{c}(1P)^{+}$ states with respect to the $B_{c}^{+}$ ground state with the transverse momentum $p_{\text{T}}$ and rapidity $y$ of $B_{c}^{+}$ mesons in the regions $p_{\text{T}}<20~\mathrm{Ge\kern -0.1em V\!/}c$ and $2.0<y<4.5$ at $\sqrt{s}=13~\text{TeV}$ is measured to be $0.20 \pm 0.03 \pm 0.02 \pm 0.03$, where the uncertainty terms represent statistical, systematic, and uncertainties related to the choice of theoretical models, respectively. The results provide a test of theoretical models and deepen our understanding of quantum chromodynamics.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

An angular analysis of the decay $B^0_s\toφe^+e^-$ is presented, using proton-proton collision data collected with the LHCb detector between 2011 and 2018 at centre-of-mass energies of 7, 8 and 13$\,\mathrm{Te\kern -0.1em V}$. The combined dataset corresponds to an integrated luminosity of $9\,\mathrm{fb}^{-1}$. Observables are determined by fitting time-integrated projections of the angular distribution in three bins of dielectron mass squared, $q^2$, corresponding to $[0.1,1.1]$, $[1.1,6.0]$ and $[15.0,19.0]\,\mathrm{Ge\kern -0.1em V}^2\!/c^4$. The results are compatible with predictions based on the Standard Model of particle physics.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

The $\mitΥ(\mathrm{2}S)$ and $\mitΥ(\mathrm{3}S)$ production cross-sections are measured relative to that of the $\mitΥ(\mathrm{1}S)$ meson, as a function of charged-particle multiplicity in proton-proton collisions at a centre-of-mass energy of $13$ TeV. The measurement uses data collected by the LHCb experiment in 2018 corresponding to an integrated luminosity of 2 $\text{fb}^{-1}$. Both the $\mitΥ(\mathrm{2}S)$-to-$\mitΥ(\mathrm{1}S)$ and $\mitΥ(\mathrm{3}S)$-to-$\mitΥ(\mathrm{1}S)$ cross-section ratios are found to decrease significantly as a function of event multiplicity, with the $\mitΥ(\mathrm{3}S)$-to-$\mitΥ(\mathrm{1}S)$ ratio showing a steeper decline towards high multiplicity. This hierarchy is qualitatively consistent with the comover model predictions, indicating that final-state interactions play an important role in bottomonia production in high-multiplicity events.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

The $Ξ_c^+ π^- π^+$ spectrum is investigated using proton-proton collisions at a center-of-mass energy of 13TeV, corresponding to an integrated luminosity of 5.4fb$^{-1}$, collected by the LHCb experiment during 2016--2018. Four states are observed with high significance, and their masses and widths are measured to be \begin{align*} m[Ξ_c(2815)^{+}] &= 2816.65 \pm 0.03 \pm 0.03 \pm 0.23 ~\text{MeV}, Γ[Ξ_c(2815)^{+}] &= 2.07 \pm 0.08 \pm 0.12~\text{MeV},\\[5pt] m[Ξ_c(2923)^{+}] &= 2922.8 \pm 0.3 \pm 0.5 \pm 0.2~\text{MeV}, Γ[Ξ_c(2923)^{+}] &= 5.3 \pm 0.9 \pm 1.4~\text{MeV},\\[5pt] m[Ξ_c(2970)^{+}] &= 2968.6 \pm 0.5 \pm 0.5 \pm 0.2~\text{MeV}, Γ[Ξ_c(2970)^{+}] &= 31.7 \pm 1.7 \pm 1.9~\text{MeV},\\[5pt] m[Ξ_c(3080)^{+}] &= 3076.8 \pm 0.7 \pm 1.3 \pm 0.2~\text{MeV}, Γ[Ξ_c(3080)^{+}] &= 6.8 \pm 2.3 \pm 0.9~\text{MeV}, \end{align*} where the uncertainties are statistical, systematic, and due to the limited precision on the $Ξ_c^+$ mass, respectively. The $Ξ_c(2923)^{+}$ baryon is observed for the first time, and is consistent with being the isospin partner of the previously observed $Ξ_c(2923)^{0}$ state. Most of the measured parameters are more precise than existing world averages.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

An angular analysis of $B^0\rightarrow K^{*0}e^{+}e^{-}$ decays is presented using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb$^{-1}$. The analysis is performed in the region of the dilepton invariant mass squared of 1.1-6.0 GeV$^{2}/c^{4}$. In addition, a test of lepton flavour universality is performed by comparing the obtained angular observables with those measured in $B^0\rightarrow K^{*0}μ^{+}μ^{-}$ decays. In general, the angular observables are found to be consistent with the Standard Model expectations as well as with global analyses of other $b \rightarrow s \ell^{+} \ell^{-}$ processes, where $\ell$ is either a muon or an electron. No sign of lepton-flavour-violating effects is observed.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

The dissociation of quarkonium states with different binding energies produced in heavy-ion collisions is a powerful probe for investigating the formation and properties of the quark-gluon plasma. The ratio of production cross-sections of $ψ(2S)$ and $J/ψ$ mesons times the ratio of their branching fractions into the dimuon final state is measured as a function of centrality using data collected by the LHCb detector in PbPb collisions at $\sqrt{s_{\text{NN}}}$ = 5.02 TeV. The measured ratio shows no dependence on the collision centrality, and is compared to the latest theory predictions and to the recent measurements in literature.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

A time-dependent, flavour-tagged measurement of $CP$ violation is performed with ${B^0}\rightarrow{D^{+}D^{-}}$ and ${B^{0}_{s}}\rightarrow{D^{+}_{s}D^{-}_{s}}$ decays, using data collected by the LHCb detector in proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 6 fb$^{-1}$. In ${B^0}\rightarrow{D^{+}D^{-}}$ decays the $CP$-violation parameters are measured to be \begin{align} S_{D^{+}D^{-}} & = -0.552 \pm 0.100\,\text{(stat)} \pm 0.010\,\text{(syst)}, \nonumber \newline C_{D^{+}D^{-}} & = \phantom{-}0.128 \pm0.103\,\text{(stat)} \pm 0.010\,\text{(syst)}. \nonumber \end{align} In $B^{0}_{s} \rightarrow D^{+}_{s}D^{-}_{s}$ decays the $CP$-violating parameter formulation in terms of $φ_{s}$ and $|λ|$ results in \begin{align} φ_{s} & = -0.086 \pm 0.106 \,\text{(stat)} \pm 0.028\,\text{(syst)} \,\text{rad}, \nonumber \newline |λ_{D^{+}_{s}D^{-}_{s}}| & = \phantom{-}1.145 \pm 0.126\,\text{(stat)} \pm 0.031\,\text{(syst)}. \nonumber \end{align} These results represent the most precise single measurement of the $CP$-violation parameters in their respective channels. For the first time in a single measurement, $CP$ symmetry is observed to be violated in ${B^0}\rightarrow{D^{+}D^{-}}$ decays with a significance exceeding six standard deviations.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

A study of resonant structures in $B^{+}\rightarrow{D^{\ast+}D^{-}K^{+}}$ and $B^{+}\rightarrow{D^{\ast-}D^{+}K^{+}}$ decays is performed, using proton-proton collision data at centre-of-mass energies of $\sqrt{s}=7, 8$, and $13$ TeV recorded by the LHCb experiment, corresponding to an integrated luminosity of 9 fb$^{-1}$. A simultaneous amplitude fit is performed to the two channels with contributions from resonances decaying to $D^{\ast-}D^{+}$ and $D^{\ast+}D^{-}$ states linked by $C$ parity. This procedure allows the $C$-parities of resonances in the $D^{\ast\pm}D^{\mp}$ mass spectra to be determined. Four charmonium(-like) states are observed decaying into $D^{\ast\pm}D^{\mp}$: $η_c(3945)$, $h_c(4000)$, $χ_{c1}(4010)$ and $h_c(4300)$, with quantum numbers $J^{PC}$ equal to $0^{-+}$, $1^{+-}$, $1^{++}$ and $1^{+-}$, respectively. At least three of these states have not been observed previously. In addition, the existence of the $T_{\bar{c}\bar{s}0}^{*}(2870)^{0}$ and $T_{\bar{c}\bar{s}1}^{*}(2900)^{0}$ resonances in the $D^-K^+$ mass spectrum, already observed in the $B^+ \to D^+ D^- K^+$ decay, is confirmed in a different production channel.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

The first full amplitude analysis of $B^+ \to ψ(2S) K^+ π^+ π^-$ decays is performed using proton-proton collision data corresponding to an integrated luminosity of $9\,\text{fb}^{-1}$ recorded with the LHCb detector. The rich $K^+ π^+ π^-$ spectrum is studied and the branching fractions of the resonant substructure associated with the prominent $K_1(1270)^+$ contribution are measured. The data cannot be described by conventional strange and charmonium resonances only. An amplitude model with 53 components is developed comprising 11 hidden-charm exotic hadrons. New production mechanisms for charged charmonium-like states are observed. Significant resonant activity with spin-parity $J^P = 1^+$ in the $ψ(2S) π^+$ system is confirmed and a multi-pole structure is demonstrated. The spectral decomposition of the $ψ(2S) π^+ π^-$ invariant-mass structure, dominated by $X^0 \to ψ(2S) ρ(770)^0$ decays, broadly resembles the $J/ψφ$ spectrum observed in $B^+ \to J/ψφK^+$ decays. Exotic $ψ(2S) K^+ π^-$ resonances are observed for the first time.

A. V. Pogorelov

Олександр Храпкін, Олена Кіндрат, Ратібор Чопей

Управління ІТ-проєктами ускладнюється стрімким розвитком нових технологій та постійним підвищенням вимог до актуальності та якості продуктів, що створюються в результаті. Стаття присвячена проблемам проєктного управління у сучасних IT-компаніях та напрямам удосконалення управління проєктами. Відзначено, що кожна IT-компанія унікальна і має свої особливості, а значить, для кожної компанії може знадобитися індивідуальний підхід до проєктного управління. У ході управління ІТ-проєктом, вирішення потребують такі питання: дедлайни, обмеження бюджету або недоліки людей, які можуть бути залучені до проєкту, керівник стикається з постійною необхідністю вирішення неординарних технологічних питань, пов'язаних з різними технічними засобами, ПЗ, операційною системою, труднощами з базами даних. Оскільки управляти ІТ-проєктами найскладніше, розглянуто низку загальних принципів, що дозволяють полегшити та спростити роботу з ними. Проаналізовано та систематизовано методологічні засади управління ІТ-проєктами, а також відзначено роль новації, яка почала застосовуватися нещодавно – штучний інтелект.

Kevin Ivander Budiono, Auditia Setiobudi

Penelitian ini bertujuan untuk mengetahui pengaruh kualitas produk, price consciousness, status consumption, dan inovasi produk terhadap minat beli produk T’Nuners. Populasi yang digunakan dalam penelitian ini adalah followers Instagram T’Nuners yang diambil sampel sebanyak 91 responden dengan teknik non probability sampling. Penyebaran kuesioner melalui google form dengan jumlah item pernyataan sebanyak 22. Skala pengukuran pada penelitian ini menggunakan skala Likert dengan kisaran 1 sampai 4. Penelitian ini menggunakan metode kuantitatif dan menggunakan teknik analisis regresi linear berganda yang diolah dengan bantuan software SPSS version 26 for Windows. Variabel bebas pada penelitian ini adalah kualitas produk (X1), price consciousness (X2), status consumption (X3), dan inovasi produk (X4). Variabel terikat pada penelitian ini adalah minat beli (Y). Hasil penelitian ini menunjukkan bahwa kualitas produk, price consciousness, status consumption, dan inovasi produk berpengaruh secara simultan terhadap minat beli. Variabel kualitas produk dan status consumption tidak berpengaruh secara parsial terhadap minat beli, sedangkan variabel price consciousness dan inovasi produk berpengaruh secara parsial terhadap minat beli.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

The fraction of $χ_{c1}$ and $χ_{c2}$ decays in the prompt $J/ψ$ yield, $F_{χc}=σ_{χ_c \to J/ψ}/σ_{J/ψ}$, is measured by the LHCb detector in pPb collisions at $\sqrt{s_{NN}}=8.16$ TeV. The study covers the forward ($1.5<y^*<4.0$) and backward ($-5.0<y^*<-2.5$) rapidity regions, where $y^*$ is the $J/ψ$ rapidity in the nucleon-nucleon center-of-mass system. Forward and backward rapidity samples correspond to integrated luminosities of 13.6 $\pm$ 0.3 nb$^{-1}$ and 20.8 $\pm$ 0.5 nb$^{-1}$, respectively. The result is presented as a function of the $J/ψ$ transverse momentum $p_{T,J/ψ}$ in the range 1$<p_{T, J/ψ}<20$ GeV/$c$. The $F_{χc}$ fraction at forward rapidity is compatible with the LHCb measurement performed in $pp$ collisions at $\sqrt{s}=7$ TeV, whereas the result at backward rapidity is 2.4 $σ$ larger than in the forward region for $1<p_{T, J/ψ}<3$ GeV/$c$. The increase of $F_{χc}$ at low $p_{T, J/ψ}$ at backward rapidity is compatible with the suppression of the $ψ$(2S) contribution to the prompt $J/ψ$ yield. The lack of in-medium dissociation of $χ_c$ states observed in this study sets an upper limit of 180 MeV on the free energy available in these pPb collisions to dissociate or inhibit charmonium state formation.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

The cross-section of associated $J/ψ$-$ψ(2S)$ production in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV is measured using a data sample corresponding to an integrated luminosity of 4.2 fb$^{-1}$, collected by the LHCb experiment. The measurement is performed for both $J/ψ$ and $ψ(2S)$ mesons having transverse momentum $p_{\text{T}}<14$ GeV/$c$ and rapidity $2.0<y<4.5$, assuming negligible polarisation of the $J/ψ$ and $ψ(2S)$ mesons. The production cross-section is measured to be $4.5\pm0.7\pm0.3$ nb, where the first uncertainty is statistical and the second systematic. The differential cross-sections are measured as functions of several kinematic variables of the $J/ψ$-$ψ(2S)$ candidates. The results are combined with a measurement of $J/ψ$-$J/ψ$ production, giving a cross-section ratio between $J/ψ$-$ψ(2S)$ and $J/ψ$-$J/ψ$ production of $0.274\pm0.044\pm0.008$, where the first uncertainty is statistical and the second systematic.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

A study of $B_c^+ \rightarrow χ_c π^+$ decays is reported using proton-proton collision data, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9fb$^{-1}$. The decay $B_c^+ \rightarrow χ_{c2} π^+$ is observed for the first time, with a significance exceeding seven standard deviations. The relative branching fraction with respect to the $B_c^+ \rightarrow J/ψπ^+$ decay is measured to be $$ \frac{\mathcal{B}_{B_c^+ \rightarrow χ_{c2} π^+}} {\mathcal{B}_{B_c^+ \rightarrow J/ψπ^+}} = 0.37 \pm 0.06 \pm 0.02 \pm 0.01 , $$ where the first uncertainty is statistical, the second is systematic, and the third is due to the knowledge of the $χ_c \rightarrow J/ψγ$ branching fraction. No significant $B_c^+ \rightarrow χ_{c1} π^+$ signal is observed and an upper limit for the relative branching fraction for the $B_c^+ \rightarrow χ_{c1} π^+$ and $B_c^+ \rightarrow χ_{c2} π^+$ decays of $$ \frac{\mathcal{B}_{B_c^+ \rightarrow χ_{c1} π^+}} {\mathcal{B}_{B_c^+ \rightarrow χ_{c2} π^+}} < 0.49 $$ is set at the 90\% confidence level.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

The production of prompt $D^+_{s}$ and $D^+$ mesons is measured by the LHCb experiment in proton-lead ($p\mathrm{Pb}$) collisions in both the forward ($1.5<y^*<4.0$) and backward ($-5.0<y^*<-2.5$) rapidity regions at a nucleon-nucleon center-of-mass energy of $\sqrt {s_{\mathrm{NN}}}=8.16\,$TeV. The nuclear modification factors of both $D^+_{s}$ and $D^+$ mesons are determined as a function of transverse momentum, $p_{\mathrm{T}}$, and rapidity. In addition, the $D^+_{s}$ to $D^+$ cross-section ratio is measured as a function of the charged particle multiplicity in the event. An enhanced $D^+_{s}$ to $D^+$ production in high-multiplicity events is observed for the whole measured $p_{\mathrm{T}}$ range, in particular at low $p_{\mathrm{T}}$ and backward rapidity, where the significance exceeds six standard deviations. This constitutes the first observation of strangeness enhancement in charm quark hadronization in high-multiplicity $p\mathrm{Pb}$ collisions. The results are also qualitatively consistent with the presence of quark coalescence as an additional charm quark hadronization mechanism in high-multiplicity proton-lead collisions.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb et al.

A study of prompt $Ξ_{c}^{+}$ production in proton-lead collisions is performed with the LHCb experiment at a centre-of-mass energy per nucleon pair of 8.16 TeV in 2016 in $p$Pb and Pb$p$ collisions with an estimated integrated luminosity of approximately 12.5 and 17.4 nb$^{-1}$, respectively. The $Ξ_{c}^{+}$ production cross-section, as well as the $Ξ_{c}^{+}$ to $Λ_{c}^{+}$ production cross-section ratio, are measured as a function of the transverse momentum and rapidity and compared to latest theory predictions. The forward-backward asymmetry is also measured as a function of the $Ξ_{c}^{+}$ transverse momentum.