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1.
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An integrated flux-symmetric spectrometer-magnet system for the SND@LHC experiment upgrade
/ SND@LHC Collaboration
The proposed upgrade of the SND@LHC experiment for the High Luminosity phase of the LHC (HL-LHC) will strongly benefit from the presence of a magnetized region, allowing for muon momentum and chargemeasurement. In this paper we describe an iron core magnet system that is partly integrated with the calorimeter and that is designed to respect the strict constraints from the available space in the experimental cavern, power consumption, and field requirements.Semi-analytical tools are introduced to explore the parameter space, in order to define the primary design options. [...]
2024 - 26 p.
- Published in : JINST 19 (2024) P12002
Fulltext: PDF;
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2.
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Observation of collider neutrinos without final state muons with the SND@LHC experiment
/ Abbaneo, D. (CERN) ; Ahmad, S. (PINSTECH, Islamabad) ; Albanese, R. (INFN, Naples ; Naples U.) ; Alexandrov, A. (INFN, Naples ; Naples U.) ; Alicante, F. (INFN, Naples ; Naples U.) ; Androsov, K. (Ecole Polytechnique, Lausanne) ; Anokhina, A. ; Asada, T. (INFN, Naples ; Naples U.) ; Asawatangtrakuldee, C. (Chulalongkorn U.) ; Ayala Torres, M.A. (Andres Bello Natl. U.) et al.
/SND@LHC
We report the observation of neutrino interactions without final state muons at the LHC, with a significance of 6.4\,$\sigma$. A data set of proton-proton collisions at $\sqrt{s}= 13.6$\,TeV collected by \SND in 2022 and 2023 is used, corresponding to an integrated luminosity of 68.6\,fb$^{-1}$. [...]
arXiv:2411.18787; CERN-EP-2024-316.-
Geneva : CERN, 2024 - 7 p.
Draft (restricted): PDF; Fulltext: Observation_of_electron_neutrino_or_neutral_current_collider_events - PDF; CERN-EP-2024-316 - PDF; 2411.18787 - PDF;
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3.
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Addendum to the AdvancedSND LoI
/ Abbaneo, D ; Albanese, R ; Alexandrov, A ; Alicante, F ; Androsov, K ; Anokhina, A ; Asada, T ; Asawatangtrakuldee, C ; Ayala Torres, M A ; Battilana, C et al.
Over the six months since the submission of the AdvSND LoI \cite{ADVSND_LOI}, the Collaboration has been intensively discussing with the CERN civil engineering team and the High Luminosity LHC (HL LHC) planning officers to fully understand the constraints related to the civil engineering modifications required for TI18 [...]
CERN-LHCC-2024-014 ; LHCC-I-040-ADD-1.
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2024.
Original Document (LHCC-I-040) - Full text
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4.
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5.
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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 - 13 p.
- Published in : Phys. Rev. D 110 (2024) L031104
Fulltext: LHCb_PAPER_2023_044 - PDF; Publication - PDF; 2404.19510 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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6.
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AdvSND, The Advanced Scattering and NeutrinoDetector at High Lumi LHC Letter of Intent
/ Abbaneo, D ; Albanese, R ; Alexandrov, A ; Alicante, F ; Androsov, K ; Anokhina, A ; Asada, T ; Asawatangtrakuldee, C ; Ayala Torres, M A ; Battilana, C et al.
The SND@LHC experiment has been taking data at the LHC since the beginning of Run3 [...]
CERN-LHCC-2024-007 ; LHCC-I-040.
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2024.
Fulltext
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7.
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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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Search for the $B_s^0 \rightarrow \mu^+\mu^-\gamma$ decay
/ LHCb Collaboration
A search for the fully reconstructed $B_s^0 \rightarrow \mu^+\mu^-\gamma$ decay is performed at the LHCb experiment using proton-proton collisions at $\sqrt{s}=13$ TeV corresponding to an integrated luminosity of $5.4\,\mathrm{fb^{-1}}$. No significant signal is found and upper limits on the branching fraction in intervals of the dimuon mass are set \begin{align} {\cal B}(B_s^0 \rightarrow \mu^+\mu^-\gamma) < 4.2\times10^{-8},~&m;(\mu\mu)\in[2m_\mu,~1.70]\,\mathrm{GeV/c^2} ,\nonumber {\cal B}(B_s^0 \rightarrow \mu^+\mu^-\gamma) < 7.7\times10^{-8},~&m;(\mu\mu)\in[1.70,~2.88]\,\mathrm{GeV/c^2},\nonumber {\cal B}(B_s^0 \rightarrow \mu^+\mu^-\gamma) < 4.2\times10^{-8},~&m;(\mu\mu)\in[3.92 ,~m_{B_s^0}]\,\mathrm{GeV/c^2},\nonumber \end{align} at 95% confidence level. [...]
arXiv:2404.03375; LHCb-PAPER-2023-045; CERN-EP-2024-065.-
2024-07-11 - 28 p.
- Published in : JHEP 2407 (2024) 101
Fulltext: 2404.03375 - PDF; document - PDF;
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9.
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10.
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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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