2024-06-03
10:41 |
Amplitude analysis of the radiative decay $B^0_s\to K^+K^-\gamma$
/ LHCb Collaboration
A search for radiative decay of $B^0_s$ mesons to orbitally excited $K^+K^-$ states is performed using proton proton collisions recorded by the \mbox{LHCb}\xspace experiment, corresponding to an integrated luminosity of 9 fb$^{-1}$. The dikaon spectrum in the mass range $m_{KK}<2400\ \text{MeV/}c^2$ is dominated by the $\phi(1020)$ resonance that accounts for almost 70$\%$ of the decay rate. [...]
arXiv:2406.00235; LHCb-PAPER-2024-002; CERN-EP-2024-115; LHCB-PAPER-2024-002.-
Geneva : CERN, 2024-08-13 - 39 p.
- Published in : 10.1007/JHEP08(2024)093
Fulltext: 2406.00235 - PDF; document - PDF; LHCb-PAPER-2024-002_arxiv - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2024-05-22
12:15 |
Study of $b-$hadron decays to $\Lambda_c^+h^-h^{\prime -}$ final states
/ LHCb Collaboration
Decays of $\Xi_{b}^{-}$ and $\Omega_{b}^{-}$ baryons to $\Lambda_{c}^{+} h^- h^{\prime -}$ final states, with $h^- h^{\prime -}$ being $\pi^{-}\pi^{-}$, $K^{-}\pi^{-}$ and $K^{-}K^{-}$ meson pairs, are searched for using data collected with the LHCb detector. The data sample studied corresponds to an integrated luminosity of $8.7 \rm fb^{-1}$ of $pp$ collisions collected at centre-of-mass energies $\sqrt{s} = 7$, $8$ and $13 \rm TeV$. [...]
arXiv:2405.12688; CERN-EP-2024-116; LHCb-PAPER-2024-013; LHCB-PAPER-2024-013.-
Geneva : CERN, 2024-08 - 32 p.
- Published in : JHEP 2408 (2024) 132
Fulltext: 2405.12688 - PDF; document - PDF; LHCb-PAPER-2024-013 - PDF; Related data file(s): ZIP;
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2024-05-02
15:37 |
First observation of $Λ_{b}^{0} \rightarrow Σ_c^{(*)++} D^{(*)-} K^{-}$ decays
/ LHCb Collaboration
The four decays, $\Lambda_{b}^{0} \rightarrow \Sigma_c^{(*)++} D^{(*)-} K^{-}$, are observed for the first time using proton-proton collision data collected with the LHCb detector at a centre-of-mass energy of $13\,\rm{TeV}$, corresponding to an integrated luminosity of $6\,\rm{fb}^{-1}$. By considering the $\Lambda_b^0 \rightarrow \Lambda_c^{+} \overline{D}^0 K^{-}$ decay as reference channel, the following branching fraction ratios are measured to be, $$\frac{\cal{B} (\Lambda_{b}^{0} \rightarrow \Sigma_{c}^{++} \rm{D}^{-} {K}^{-})}{\cal{B}(\Lambda_{b}^{0} \rightarrow \Lambda_c^{+} \rm \overline{D}^0 {K}^{-})} = {0.282}\pm{0.016}\pm{0.016}\pm{0.005},\\ \frac{\cal{B}(\Lambda_{b}^{0} \rightarrow \Sigma_{c}^{*++} \rm {D}^{-} {K}^{-})}{\cal{B}(\Lambda_{b}^{0} \rightarrow \Sigma_c^{++} \rm {D}^{-} {K}^{-})} = {0.460}\pm{0.052}\pm{0.028},\\ \frac{\cal{B}(\Lambda_{b}^{0} \rightarrow \Sigma_{c}^{++} \rm {D}^{*-} {K}^{-})}{\cal{B}(\Lambda_{b}^{0} \rightarrow \Sigma_c^{++} \rm {D}^{-} {K}^{-})} = {2.261}\pm{0.202}\pm{0.129}\pm{0.046},\\ \frac{\cal{B}(\Lambda_{b}^{0} \rightarrow \Sigma_{c}^{*++} \rm D^{*-} K^{-})}{\cal{B}(\Lambda_{b}^{0} \rightarrow \Sigma_c^{++} \rm D^{-} K^{-})} = {0.896}\pm{0.137}\pm{0.066}\pm{0.018},$$ where the first uncertainties are statistical, the second are systematic, and the third are due to uncertainties in the branching fractions of intermediate particle decays. [...]
arXiv:2404.19510; LHCb-PAPER-2023-044; CERN-EP-2024-098.-
Geneva : CERN, 2024-08-01 - 21 p.
- Published in : Phys. Rev. D 110 (2024) L031104
Fulltext: LHCb_PAPER_2023_044 - PDF; 2404.19510 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2024-05-02
11:55 |
Amplitude analysis and branching fraction measurement of $B^{+} \to D^{*-}D_{s}^{+}\pi^{+}$ decays
/ LHCb Collaboration
The decays of the $B^{+}$ meson to the final state $D^{*-}D^{+}_{s}\pi^{+}$ are studied in proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb$^{-1}$. The ratio of branching fractions of the $B^{+}\to D^{*-}D^{+}_{s}\pi^{+}$ and $B^{0}\to D^{*-}D^{+}_{s}$ decays is measured to be $0.173\pm 0.006\pm 0.010$, where the first uncertainty is statistical and the second is systematic. [...]
arXiv:2405.00098; LHCb-PAPER-2024-001; CERN-EP-2024-110.-
Geneva : CERN, 2024-08-21 - 41 p.
- Published in : JHEP 2408 (2024) 165
Fulltext: document - PDF; 2405.00098 - PDF; Related data file(s): ZIP;
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2024-04-11
09:27 |
Search for prompt production of pentaquarks in charm hadron final states
/ LHCb Collaboration
A search for hidden-charm pentaquark states decaying to a range of $\Sigma_{c}\bar{D}$ and $\Lambda_{c}^{+}\bar{D}$ final states, as well as doubly-charmed pentaquark states to $\Sigma_{c}D$ and $\Lambda_{c}^{+}D$, is made using samples of proton-proton collision data corresponding to an integrated luminosity of $5.7fb^{-1}$ recorded by the LHCb detector at $\sqrt{s} = 13 Te\kern -0.1em V$. Since no significant signals are found, upper limits are set on the pentaquark yields relative to that of the $\Lambda_{c}^+$ baryon in the $\Lambda_{c}^{+}\to pK^{-}\pi^{+}$ decay mode. [...]
arXiv:2404.07131; LHCb-PAPER-2023-018; CERN-EP-2024-071; LHCB-PAPER-2023-018.-
Geneva : CERN, 2024-08-01 - 19 p.
- Published in : Phys. Rev. D 110 (2024) 032001
Fulltext: 2404.07131 - PDF; LHCb-PAPER-2023-018 - PDF; Publication - PDF; Related data file(s): ZIP; Supplementary information: PDF;
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2024-04-05
15:16 |
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2024-03-07
13:59 |
Amplitude analysis of the $\Lambda_b^0\to pK^-\gamma$ decay
/ LHCb Collaboration
The resonant structure of the radiative decay $\Lambda_b^0\to pK^-\gamma$ in the region of proton-kaon invariant-mass up to 2.5 GeV$/c^2$ is studied using proton-proton collision data recorded at centre-of-mass energies of 7, 8, and 13 TeV collected with the LHCb detector, corresponding to a total integrated luminosity of 9 fb$^{-1}$. Results are given in terms of fit and interference fractions between the different components contributing to this final state. [...]
arXiv:2403.03710; LHCb-PAPER-2023-036; CERN-EP-2023-253; LHCB-PAPER-2023-036.-
Geneva : CERN, 2024-06-18 - 39 p.
Fulltext: 2403.03710 - PDF; LHCb-PAPER-2023-036 - PDF; document - PDF; Related data file(s): ZIP; External link: Previous draft version
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2024-03-06
14:45 |
First observation of the $\Lambda^0_b \to D^+ D^- \Lambda$ decay
/ LHCb Collaboration
The $\Lambda^0_b \to D^+ D^- \Lambda$ decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of $13 \mathrm{TeV}$, corresponding to an integrated luminosity of $5.3 \mathrm{fb}^{-1}$. Using the $B^0 \to D^+ D^- K_{\mathrm{S}}^0$ decay as a reference channel, the product of the relative production cross-section and decay branching fractions is measured to be $$ {\cal R}=\frac{\sigma_{\Lambda^0_b}}{\sigma_{B^0}} \times \frac{{\cal B}(\Lambda^0_b \to D^+ D^- \Lambda)}{{\cal B}(B^0 \to D^+ D^- K_{\mathrm{S}}^0)}=0.179 \pm 0.022 \pm 0.014 $$ where the first uncertainty is statistical and the second is systematic. [...]
arXiv:2403.03586; LHCb-PAPER-2023-042; CERN-EP-2024-041; LHCB-PAPER-2023-042.-
Geneva : CERN, 2024-07-16 - 23 p.
- Published in : JHEP 2407 (2024) 140
Fulltext: 2403.03586 - PDF; document - PDF; LHCb-PAPER-2023-042 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2024-02-29
14:56 |
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2024-02-26
13:36 |
Observation of the $B_c^+ \to J/\psi \pi^+ \pi^0$ decay
/ LHCb Collaboration
The first observation of the $B_c^+ \to J/\psi \pi^+ \pi^0$ decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 9 fb$^{-1}$, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV. The ratio of its branching fraction relative to the $B_c^+ \to J/\psi \pi^+$ channel is measured to be $$ \frac{ {\cal{B}}_{( B_c^+ \to J/\psi \pi^+\pi^0 ) }} { {\cal{B}}_{( B_c^+ \to J/\psi \pi^+ ) }} = 2.80 \pm 0.15 \pm 0.11 \pm 0.16 \,, $$ where the first uncertainty is statistical, the second systematic and the third related to imprecise knowledge of the branching fractions for $B^+ \to J/\psi K^{*+}$ and $B^+ \to J/\psi K^+$ decays, which are used to determine the $\pi^0$ detection efficiency. [...]
arXiv:2402.05523; LHCb-PAPER-2023-046; CERN-EP-2024-019; LHCB-PAPER-2023-046.-
Geneva : CERN, 2024-04-30 - 30 p.
- Published in : JHEP 2404 (2024) 151
Fulltext: 2402.05523 - PDF; document - PDF; Related data file(s): ZIP;
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