LHCb Conference Contributions

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2025-04-04
10:35

First observation of the $\phi$ (1020) meson in the $K^+K^-$ mass spectrum of ultra-pheripheral PbPb collisions at forward rapidity /LHCb Collaboration
The first observation of the

$\phi(1020)$ meson in the invariant-mass distribution of

$K^+K^-$ meson pairs produced in ultra-peripheral PbPb interactions at forward rapidity, in the range 2.0-4.5, is presented. The PbPb data were collected by the LHCb experiment in 2018 at a nucleon-nucleon center-of-mass energy

$\sqrt{snn}$ =5.02 TeV, and correspond to an integrated luminosity of

$228\pm10 \mu b^{-1}$ [...]
LHCb-CONF-2025-001; CERN-LHCb-CONF-2025-001.- Geneva : CERN, 2025 Fulltext: PDF;
In : 31st International Conference on Ultra-relativistic Nucleus-Nucleus Collisions, Frankfurt, De, 6 - 12 Apr 2025

Detaljnije

2024-07-30
17:34

Antihelium production in $\overline{\it \Lambda}_b^0$ decays /LHCb Collaboration
Decays of

$\overline{\Lambda}^{0}_{b}$ baryons produced in dark matter annihilating into

$b\overline b$ pairs could enhance the abundance of antihelium in cosmic rays. The LHCb collaboration provides in this paper the first experimental limits on related branching fractions:

$\begin{align*} \mathcal B({\overline{\it \Lambda}_b^0\to{}^3{\rm\overline He}p p})&<1.9\times10^{-9}\text{ at 90% CL,}\\ \mathcal B({\overline{\it \Lambda}_b^0\to{}^3{\rm\overline He}pp X})&<1.6\times10^{-8}\text{ at 90% CL,}\\ \mathcal B({\overline{\it \Lambda}_b^0\to{}^3{\rm \overline He}pX})&<3.6\times10^{-8}\text{ at 90% CL,} \end{align*}$ where

$X$ denotes one or several particles. [...]
LHCb-CONF-2024-005; CERN-LHCb-CONF-2024-005.- Geneva : CERN, 2024 - 19. - Published in : PoS: ICHEP2024 (2025) , pp. 676 Fulltext: LHCb-CONF-2024-005-figures - ZIP; LHCb-CONF-2024-005 - PDF; ICHEP2024_676 - PDF;
In : 42nd International Conference on High Energy Physics (ICHEP 2024), Prague, Czech Republic, 18 - 24 Jul 2024, pp.676

Detaljnije

2024-07-26
14:09

Simultaneous determination of the CKM angle $\gamma$ and parameters related to mixing and $C\!P$ violation in the charm sector /LHCb Collaboration
A combination of measurements sensitive to the

$C\!P$ -violation angle

$\gamma$ of the Cabibbo-Kobayashi-Maskawa unitarity triangle, to the charm mixing parameters that describe oscillations between

$D^0$ and and

$\overline D^0$ mesons, and to the

$C\!P$ asymmetries in the

$D^0 \!\to K^+ K^-$ and

$D^0 \!\to \pi^+ \pi^-$ decays is performed. All relevant beauty and charm results obtained with the data collected with the LHCb detector at CERN's Large Hadron Collider to date are included. [...]
LHCb-CONF-2024-004; CERN-LHCb-CONF-2024-004.- Geneva : CERN, 2024 - 29. Fulltext: LHCb-CONF-2024-004 - PDF; LHCb-CONF-2024-004-figs - ZIP;
In : 42nd International Conference on High Energy Physics (ICHEP 2024), Prague, Czech Republic, 18 - 24 Jul 2024

Detaljnije

2024-06-06
16:32

Search for $B_{(s)}^{*0}\to\mu^+\mu^-$ in $B_c^+\to\pi^+\mu^+\mu^-$ decays /LHCb Collaboration
A search for the very rare

$B^{*0}\to\mu^+\mu^-$ and

$B_{s}^{*0}\to\mu^+\mu^-$ decays is conducted by analysing the

$B_c^+\to\pi^+\mu^+\mu^-$ process. The analysis uses proton-proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9\,fb

$^{-1}$ . [...]
LHCb-CONF-2024-003; CERN-LHCb-CONF-2024-003.- Geneva : CERN, 2024 - 15. Fulltext: LHCb-CONF-2024-003 - PDF; LHCb-CONF-2024-003.figures - ZIP;
In : 12th Edition of the Large Hadron Collider Physics Conference (LHCP2024), Boston, United States, 3 - 7 Jun 2024, pp.LHCb-CONF-2024-003 ; CERN-LHCb-CONF-2024-003

Detaljnije

2024-06-06
11:11

Observation of the $\Sigma^+ \to p \mu^+ \mu^-$ rare decay at LHCb /LHCb Collaboration
The first observation of the

$\Sigma^+ \to p \mu^+ \mu^-$ decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of

$5.4\,fb^{-1}$ , collected with the LHCb detector at a centre-of-mass energy of 13 TeV. A yield of

$279 \pm 19$

$\Sigma^+ \to p \mu^+ \mu^-$ decays is observed. [...]
LHCb-CONF-2024-002; CERN-LHCb-CONF-2024-002.- Geneva : CERN, 2024 - 16. Fulltext: LHCb-CONF-2024-002 - PDF; LHCb-CONF-2024-002-figures - ZIP;
In : The XV International Conference on Beauty, Charm, Hyperons in Hadronic Interactions (BEACH 2024) , Charleston, Sc, Us, 3 - 7 Jun 2024

Detaljnije

2024-04-02
18:14

Observation of the rare decay $J\mskip -3mu/\mskip -2mu\psi \to \mu^+\mu^-\mu^+\mu^-$ /LHCb Collaboration
The rare electromagnetic decay

$J\mskip -3mu/\mskip -2mu\psi \to \mu^+\mu^-\mu^+\mu^-$ is observed with significance greatly exceeding the discovery threshold, using the proton-proton collision data collected by the LHCb experiment in 2016-2018 at a center-of-mass energy of 13

$\textrm{TeV}$ , corresponding to an integrated luminosity of 5.4

$\text{fb}^{-1}$ . The rate of this decay is measured relative to that of

$J\mskip -3mu/\mskip -2mu\psi \to \mu^+\mu^-$ mode. [...]
LHCb-CONF-2024-001; CERN-LHCb-CONF-2024-001.- Geneva : CERN, 2024 - 17. Fulltext: LHCb-CONF-2024-001 - PDF; LHCb-CONF-2024-001_Figures - ZIP;
In : 58th Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, Italy, 31 Mar - 7 Apr 2024

Detaljnije

2023-10-24
09:25

Pending /LHCb Collaboration
Pending
LHCb-CONF-2023-005; CERN-LHCb-CONF-2023-005.- Geneva : CERN, 2023 - 23.
In : 12th International Workshop on the CKM Unitarity Triangle (CKM 2023), Santiago De Compostela, Spain, 18 - 22 Sep 2023

Detaljnije

2023-10-04
14:36

Measurement of $CP$ asymmetry in $B^0_s \rightarrow D^{\mp}_s K^{\pm}$ decays /LHCb Collaboration
A measurement of the

$CP$ -violating parameters in

$B^0_s \rightarrow > D^{\mp}_s K^{\pm}$ decays obtained from

$pp$ collisions is reported, using a data set corresponding to an integrated luminosity of

$6\,\textrm{fb}^{-1}$ at a centre-of-mass energy of

${\sqrt{s}=13 \,\textrm{TeV}}$ recorded with the LHCb detector between 2015 and 2018. The measured values are: >

$\begin{align*} C_f &= \phantom{+}0.791 \pm 0.061 \pm 0.022 \, , \\ A_f^{\Delta \Gamma} &= -0.051 \pm 0.134 \pm 0.037\, , \\ A_{\bar{f}}^{\Delta \Gamma} &= -0.303 \pm 0.125 \pm 0.036\, , \\ S_f &= -0.571 \pm 0.084 \pm 0.023\, , \\ S_{\bar{f}} &= -0.503 \pm 0.084 \pm 0.025 \, , \end{align*}$ where the uncertainties are statistical and systematic, respectively. [...]
LHCb-CONF-2023-004; CERN-LHCb-CONF-2023-004.- Geneva : CERN, 2023 - 25. Fulltext: LHCb-CONF-2023-004-Fig-Supplementary - ZIP; LHCb-CONF-2023-004 - PDF; LHCb-CONF-2023-004_final_typofix - PDF; LHCb-CONF-2023-004-Fig - ZIP;
In : 12th International Workshop on the CKM Unitarity Triangle (CKM 2023), Santiago De Compostela, Spain, 18 - 22 Sep 2023

Detaljnije

2023-10-04
14:25

Study of $CP$ -violation in $B^0 \to D K^{*}(892)^0$ decays with $D\to K\pi(\pi\pi)$ , $\pi\pi(\pi\pi)$ , and $KK$ final states /LHCb Collaboration
The

$CP$ -violating observables associated with the interference of

$B^0\to D^0 K^{*}(892)^0$ and

$B^0\to \overline{D}^{0} K^{*}(892)^0$ decay amplitudes are measured in the

$D^0 \to K^{\mp}\pi^{\pm}(\pi^{+}\pi^{-}),$

$D^0 \to \pi^{+}\pi^{-}(\pi^{+}\pi^{-})$ , and

$D^0\to K^+K^-$ final states with proton-proton data collected by the LHCb experiment corresponding to an integrated luminosity of

$9 \text{fb}^{-1}$ . These observables are used to set constraints on the parameter space of the CKM angle

$\gamma$ and the hadronic parameters

$r_{B^0}^{D K^{*}}$ and

$\delta_{B^0}^{DK^{*}}$ with inputs from other measurements [...]
LHCb-CONF-2023-003; CERN-LHCb-CONF-2023-003.- Geneva : CERN, 2023 - 23. Fulltext: figs - ZIP; LHCb-CONF-2023-003 - PDF;
In : 12th International Workshop on the CKM Unitarity Triangle (CKM 2023), Santiago De Compostela, Spain, 18 - 22 Sep 2023

Detaljnije

2023-08-23
09:47

Observation of antihypertriton in $pp$ collisions with LHCb /LHCb Collaboration
The first observation at the LHCb experiment of hypertritons and antihypertritons is reported. The dataset consists of

$pp$ collisions at

$\sqrt{s}=13{\rm \,Te\kern -0.1em V}$ , collected between 2016 and 2018 and corresponding to an integrated luminosity of

$5.5\,{\rm fb}^{-1}$ . [...]
LHCb-CONF-2023-002; CERN-LHCb-CONF-2023-002.- Geneva : CERN, 2023 - 8. Fulltext: LHCb-CONF-2023002zip - ZIP; LHCb-CONF-2023-002 - PDF;
In : 2023 European Physical Society Conference on High Energy Physics (EPS-HEP2023), Hamburg, Germany, 20 - 25 Aug 2023

Detaljnije

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