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Study of charmonium production via the decay to $p\bar{p}$ at $\sqrt{s} = 13\,\rm{TeV}$ / LHCb Collaboration
Charmonium production cross-section in proton-proton collisions is measured at the centre-of-mass energy $\sqrt{s}=13\,\rm{TeV}$ using decays to $p\bar{p}$ final state. The study is performed using a data sample corresponding to an integrated luminosity of $2.2\,\rm{fb}^{-1}$ collected in 2018 with the $\mbox{LHCb}$ detector. [...]
arXiv:2407.14261; LHCb-PAPER-2024-004; CERN-EP-2024-165; LHCB-PAPER-2024-004.- Geneva : CERN, 2024-12-09 - 32 p. - Published in : Eur. Phys. J. C 84 (2024) 1274 Fulltext: 2407.14261 - PDF; document - PDF; Related data file(s): ZIP;

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Observation of Exotic <math display="inline"><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi><mi>ϕ</mi></mrow></math> Resonant Structure in Diffractive Processes in Proton-Proton Collisions / LHCb Collaboration
The first study of $J\mskip -3mu/\mskip -2mu\psi\phi$ production in diffractive processes in proton-proton collisions is presented. The study is based on an LHCb dataset recorded at centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of $5\,\mathrm{fb}^{-1}$. [...]
arXiv:2407.14301; LHCb-PAPER-2023-043; CERN-EP-2024-149; LHCB-PAPER-2023-043.- Geneva : CERN, 2025-01-24 - 12 p. - Published in : Phys. Rev. Lett. 134 (2025) 031902 Fulltext: LHCb-PAPER-2023-043-arXiv - PDF; 2407.14301 - PDF; Publication - PDF; Related data file(s): ZIP;

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Search for the rare decay of charmed baryon <math display="inline"><msubsup><mi mathvariant="normal">Λ</mi><mi>c</mi><mo>+</mo></msubsup></math> into the <math display="inline"><mi>p</mi><msup><mi>μ</mi><mo>+</mo></msup><msup><mi>μ</mi><mo>-</mo></msup></math> final state / LHCb Collaboration
A search for the nonresonant $\Lambda_c^+ \to p \mu^+ \mu^-$ decay is performed using proton-proton collision data recorded at a centre-of-mass energy of 13 TeV by the LHCb experiment, corresponding to an integrated luminosity of 5.4 fb$^{-1}$. No evidence for the decay is found in the dimuon invariant-mass regions where the expected contributions of resonances is subdominant. [...]
arXiv:2407.11474; LHCb-PAPER-2024-005; CERN-EP-2024-158; LHCB-PAPER-2024-005.- Geneva : CERN, 2024-09-01 - 13 p. - Published in : Phys. Rev. D 110 (2024) 052007 Fulltext: 2407.11474 - PDF; Publication - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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Observation of New Charmonium or Charmoniumlike States in <math display="inline"><msup><mi>B</mi><mo>+</mo></msup><mo stretchy="false">→</mo><msup><mi>D</mi><mrow><mo>*</mo><mo>±</mo></mrow></msup><msup><mi>D</mi><mo>∓</mo></msup><msup><mi>K</mi><mo>+</mo></msup></math> Decays / LHCb Collaboration
A study of resonant structures in $B^{+}\rightarrow{D^{*+}D^{-}K^{+}}$ and $B^{+}\rightarrow{D^{*-}D^{+}K^{+}}$ 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 $D^{*-}D^{+}$ and $D^{*+}D^{-}$ states linked by $C$-parity. [...]
arXiv:2406.03156; LHCb-PAPER-2023-047; CERN-EP-2024-096.- Geneva : CERN, 2024-09-27 - 14 p. - Published in : Phys. Rev. Lett. 133 (2024) 131902 Fulltext: 2406.03156 - PDF; Publication - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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Acceleration beyond lowest order event generation. An outlook on further parallelism within MadGraph5_aMC@NLO / Wettersten, Zenny (CERN ; Vienna, OAW) ; Mattelaer, Olivier (Louvain U., CP3) ; Roiser, Stefan (CERN) ; Schöfbeck, Robert (Vienna, OAW) ; Valassi, Andrea (CERN)
An important area of high energy physics studies at the Large Hadron Collider (LHC) currently concerns the need for more extensive and precise comparison data. Important tools in this realm are event reweighing and evaluation of more precise next-to-leading order (NLO) processes via Monte Carlo event generators, especially in the context of the upcoming High Luminosity LHC. [...]
arXiv:2312.07440.- 2024 - 8 p. - Published in : EPJ Web Conf.: 295 (2024) , pp. 10001
Fulltext: 2312.07440 - PDF; document - PDF;
In : 26th International Conference on Computing in High Energy & Nuclear Physics, Norfolk, Virginia, Us, 8 - 12 May 2023, pp.10001

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Search for the lepton-flavor violating decay $B_s^0\to \phi \mu^\pm \tau^\mp$ / LHCb Collaboration
A search for the lepton-flavor violating decays $B^0_s\to\phi\mu^\pm\tau^\mp$ is presented, using a sample of proton-proton collisions at center-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of $9\,\text{fb}^{-1}$. The $\tau$ leptons are selected using decays with three charged pions. [...]
arXiv:2405.13103; LHCb-PAPER-2024-006; CERN-EP-2024-114.- Geneva : CERN, 2024-10-01 - 12 p. - Published in : Phys. Rev. D 110 (2024) 072014 Fulltext: 2405.13103 - PDF; Publication - PDF; Related data file(s): ZIP;

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Search for Time-Dependent <math display="inline"><mi>C</mi><mi>P</mi></math> Violation in <math display="inline"><mrow><msup><mrow><mi>D</mi></mrow><mrow><mn>0</mn></mrow></msup><mo stretchy="false">→</mo><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>-</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup></mrow></math> Decays / LHCb Collaboration
A measurement of time-dependent $CP$ violation in $D^0 \rightarrow \pi^+ \pi^- \pi^0$ decays using a $pp$ collision data sample collected by the LHCb experiment in 2012 and from 2015 to 2018, corresponding to an integrated luminosity of 7.7$\,\mathrm{fb}^{-1}$, is presented. The initial flavour of each $D^0$ candidate is determined from the charge of the pion produced in the $D^*(2010)^+ \rightarrow D^0 \pi^+$ decay. [...]
arXiv:2405.06556; LHCb-PAPER-2024-003; CERN-EP-2024-111; LHCB-PAPER-2024-003.- Geneva : CERN, 2024-09-05 - 12 p. - Published in : Phys. Rev. Lett. 133 (2024) 101803 Fulltext: 2405.06556 - PDF; Publication - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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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: 2404.19510 - PDF; Publication - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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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: 2405.00098 - PDF; document - PDF; Related data file(s): ZIP;

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10.

Madgraph5_aMC@NLO on GPUs and vector CPUs Experience with the first alpha release / Hageboeck, Stephan (CERN) ; Childers, Taylor (Argonne (main)) ; Hopkins, Walter (Argonne (main)) ; Mattelaer, Olivier (Cathol. U. Louvain (main)) ; Nichols, Nathan (Argonne (main)) ; Roiser, Stefan (CERN) ; Teig, Jørgen (CERN) ; Valassi, Andrea (CERN) ; Vuosalo, Carl (U. Wisconsin, Madison (main)) ; Wettersten, Zenny (CERN)
Madgraph5_aMC@NLO is one of the most-frequently used Monte-Carlo event generators at the LHC, and an important consumer of compute resources. The software has been reengineered to maintain the overall look and feel of the user interface while speeding up event generation on CPUs and GPUs. [...]
arXiv:2312.02898.- 2024 - 8 p. - Published in : EPJ Web Conf. 295 (2024) 11013 Fulltext: document - PDF; 2312.02898 - PDF;
In : 26th International Conference on Computing in High Energy & Nuclear Physics, Norfolk, Virginia, Us, 8 - 12 May 2023, pp.11013

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39	VALASSI, A
691	VALASSI, Andrea
39	Valassi, A
138	Valassi, A.

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