303 hasil untuk "LHCb Collaboration"
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Observation of structure in the J/ψ-pair mass spectrum
Using proton-proton collision data at centre-of-mass energies of s = 7 , 8 and 13 TeV recorded by the LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 9 fb - 1 , the invariant mass spectrum of J / ψ pairs is studied. A narrow structure around 6.9 GeV / c 2…
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Artikel Jurnal Teks lengkap
Evidence of a J / ψ Λ structure and observation of excited Ξ - states in the Ξ b - → J / ψ Λ K - decay
…to a total integrated luminosity of 9 fb - 1 , collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV.
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Study of the doubly charmed tetraquark $${{{{{{\rm{T}}}}}}}_{{{{{{\rm{c}}}}}}{{{{{\rm{c}}}}}}}^{+}$$ T c c +
The existence and properties of tetraquark states with two heavy quarks and two light antiquarks have been widely debated. Here, the authors use a unitarized model to study the properties of an exotic narrow state compatible with a doubly charmed tetraquark.
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Measurement of the CKM angle $$\gamma $$ γ in the $${{{B} ^0} \rightarrow {D} {{K} ^{*0}}}$$ B 0 → D K ∗ 0 channel using self-conjugate $${D} \rightarrow {{K} ^0_{\textrm{S}}} h^+ h^-$$ D → K S 0 h + h - decays
…luminosity of 9 $$\text {\,fb} ^{-1}$$ \,fb - 1 collected by the LHCb experiment at centre-of-mass energies of $$\sqrt{s}=7, \, 8$$ s = 7 , 8 and 13 $$\text {\,Te\hspace{-1.00006pt}V}$$ \,Te V . The CKM angle $$\gamma $$ γ is determined by examining the distributions of signal decays in phase-space…
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Amplitude analysis of $$B^0 \rightarrow \eta _c(1S) K^+ \pi ^- $$ B 0 → η c ( 1 S ) K + π - decays
…{fb} ^{-1}$$ fb - 1 of $$p $$ p $$p $$ p collision data collected by the LHCb detector at centre-of-mass energies of $$\sqrt{s}$$ s = 7, 8 and 13 $$\,\text {Te\hspace{-1.00006pt}V}$$ Te V . The data are described with a model including only intermediate contributions from known $${K} ^{*0}$$ K ∗ 0…
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Observation of the $${{{\varLambda } ^0_{b}} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {{\varXi } ^-} {{K} ^+} }$$ Λ b 0 → J / ψ Ξ - K + and $${{{{\varXi } ^0_{b}} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {{\varXi } ^-} {{\pi } ^+} }}$$ Ξ b 0 → J / ψ Ξ - π + decays
…ψ Ξ - K + decay are reported, using proton-proton collision data from the LHCb experiment collected in 2016–2018 at a centre-of-mass energy of 13 $$\text {\,Te\hspace{-1.00006pt}V}$$ \,Te V , corresponding to an integrated luminosity of 5.4 $$\text {\,fb} ^{-1}$$ \,fb - 1 . Using the…
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Measurements of $$\psi (2S)$$ ψ ( 2 S ) and $$\chi _{c1}(3872)$$ χ c 1 ( 3872 ) production within fully reconstructed jets
…in the forward region using proton-proton collision data collected by the LHCb experiment at the center-of-mass-energy of $$13\text {TeV} $$ 13 TeV in 2016, corresponding to an integrated luminosity of $$1.64\,\text {\,fb} ^{-1} $$ 1.64 \,fb - 1 . The fragmentation function, presented as the ratio…
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Deuteron identification via time of flight with LHCb
Abstract It is shown that the timing capabilities of the LHCb detector operated during the LHC Run 2 can be used to identify light ion particles with momenta of a few GeV/c. This is achieved by estimating the particle time of flight through a newly developed technique. A dedicated reconstruction…
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Study of charmonium production via the decay to $$p\bar{p}$$ p p ¯ at $$\sqrt{s} = 13\,\textrm{TeV}$$ s = 13 TeV
…$$2.2\,\textrm{fb}^{-1}$$ 2.2 fb - 1 collected in 2018 with the $$\text{ LHCb }$$ LHCb detector. The production cross-section of the $$\eta _c$$ η c meson is measured in a rapidity range of $$2.0< y < 4.0$$ 2.0 < y < 4.0 and in a transverse momentum range of $$5.0< p_{\textrm{T}} <…
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Measurement of exclusive $J/\psi$ and $\psi(2S)$ production at $\sqrt{s}=13$ TeV
…2016–2018 data. They are performed by requiring both muons to be in the LHCb acceptance (with pseudorapidity $2
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Search for $$B_{(s)}^{*0}\rightarrow \mu ^+\mu ^-$$ B ( s ) ∗ 0 → μ + μ - in $$B_c^+\rightarrow \pi ^+\mu ^+\mu ^-$$ B c + → π + μ + μ - decays
…The analysis uses proton-proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 $$\text {\,fb}^{-1}$$ \,fb - 1 . The signal signatures correspond to simultaneous peaks in the $$\mu ^+\mu ^-$$ μ + μ - and $$\pi ^+\mu ^+\mu ^-$$ π…
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Observation of $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$ Λ b 0 → Λ c + D ¯ ( ∗ ) 0 K - and $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} $$ Λ b 0 → Λ c + D s ∗ - decays
…luminosity of 5.4 $$\text {fb} ^{-1}$$ fb - 1 collected with the LHCb detector. Their ratios of branching fractions with respect to the $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} $$ Λ b 0 → Λ c + D s - mode are measured to be $$\begin{aligned} \begin{aligned}…
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Observation of $${{\varXi } ^0_{b}} \rightarrow {{\varXi } ^+_{c}} {{D} ^-_{s}} $$ Ξ b 0 → Ξ c + D s - and $${{\varXi } ^-_{b}} \rightarrow {{\varXi } ^0_{c}} {{D} ^-_{s}} $$ Ξ b - → Ξ c 0 D s - decays
…for the first time using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of $$\sqrt{s}=13\,\,\textrm{TeV}$$ s = 13 TeV , corresponding to an integrated luminosity of $$5.1\,\,\textrm{fb}^{-1}$$ 5.1 fb - 1 . The branching fractions times the production…
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Recent results from LHCb for astroparticle physics
The LHCb experiment is a general-purpose forward spectrometer designed for the study of heavy flavour physics at the LHC. The acceptance in the pseudorapidity range $2 < \eta < 5$ with full tracking and particle identification capabilities down to very small transverse momentum make LHCb also ideal…
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Experimental status of LNU in B decays in LHCb
…latest lepton universality tests in semileptonic $b\to c$ transitions at LHCb is reported.
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Erratum to: Measurement of $$\psi (2S)$$ ψ(2S) meson production in pp collisions at $$\sqrt{s}=7\,\hbox {TeV}$$ s=7TeV
This erratum corrects measurements of the prompt and secondary (from-b).
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Observation of X(3872) production in pp collisions at $\sqrt{s}=7\mbox{~TeV}$
Abstract Using 34.7 pb−1 of data collected with the LHCb detector, the inclusive production of the X(3872) meson in pp collisions at $\sqrt{s}=7\mbox{~TeV}$ is observed for the first time. Candidates are selected in the X(3872)→J/ψπ + π − decay mode, and used to measure where σ(pp→X(3872)+anything)…
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Erratum to: Differential branching fraction and angular analysis of Λ b 0 → Λμ + μ − decays
The angular distribution of the dimuon system of the decays.