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2023-08-14
13:46
$\Lambda_c^+$ polarimetry using the dominant hadronic mode / LHCb Collaboration
The polarimeter vector field for multibody decays of a spin-half baryon is introduced as a generalisation of the baryon asymmetry parameters. Using a recent amplitude analysis of the $\Lambda_c^+ \to p K^- \pi^+$ decay performed at the LHCb experiment, we compute the distribution of the kinematic-dependent polarimeter vector for this process in the space of Mandelstam variables to express the polarised decay rate in a model-agnostic form. [...]
arXiv:2301.07010; LHCb-PAPER-2022-044; CERN-EP-2022-287.- Geneva : CERN, 2023-07-31 - 20 p. - Published in : JHEP 2307 (2023) 228 Fulltext: document - PDF; 2301.07010 - PDF; Related data file(s): ZIP;

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2023-08-04
11:20
Observation of the decays $ {B}_{(s)}^0 $ → D$_{s1}$(2536)$^{∓}$K$^{±}$ / LHCb Collaboration
This paper reports the observation of the decays $B_{(s)}^{0}\to D_{s1}(2536)^{\mp}K^{\pm}$ using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9\,\mathrm{fb}^{-1}$. The branching fractions of these decays are measured relative to the normalisation channel $B^{0}\to \kern 0.18em\overline{\kern -0.18em D}^{0}K^{+}K^{-}$. [...]
arXiv:2308.00587; LHCb-PAPER-2023-014; CERN-EP-2023-140.- Geneva : CERN, 2023-10-17 - 26 p. - Published in : JHEP 2310 (2023) 106 Fulltext: 2308.00587 - PDF; document - PDF; Related data file(s): ZIP;

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2023-07-28
13:52
Observation of New Baryons in the <math display="inline"><msubsup><mi mathvariant="normal">Ξ</mi><mi>b</mi><mo>-</mo></msubsup><msup><mi>π</mi><mo>+</mo></msup><msup><mi>π</mi><mo>-</mo></msup></math> and <math display="inline"><mrow><msubsup><mrow><mi mathvariant="normal">Ξ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mn>0</mn></mrow></msubsup><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>-</mo></mrow></msup></mrow></math> Systems / LHCb Collaboration
The first observation and study of two new baryonic structures in the final state $\Xi_b^0\pi^+\pi^-$ and the confirmation of the $\Xi_b(6100)^-$ state in the $\Xi_b^-\pi^+\pi^-$ decay mode are reported using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 $\mathrm{fb}^{-1}$. In addition, the properties of the known $\Xi_b^{*0}$, $\Xi_b^{'-}$ and $\Xi_b^{*-}$ resonances are measured with improved precision. [...]
arXiv:2307.13399; LHCb-PAPER-2023-008; CERN-EP-2023-126.- Geneva : CERN, 2023-10-23 - 11 p. - Published in : Phys. Rev. Lett. 131 (2023) 171901 Fulltext: 2307.13399 - PDF; Publication - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2023-07-13
13:59
Transformation of transverse momentum distributions from Parton Branching to Collins-Soper-Sterman framework / Bermudez Martinez, Armando (CERN)
Two main frameworks for defining transverse momentum dependent (TMD) parton densities are the Collins-Soper-Sterman (CSS) formalism, and the Parton Branching (PB) approach. While PB-TMDs have an explicit dependence on a single scale which is used to evolve PB-TMDs in momentum space, TMDs defined in CSS formalism present a double-scale evolution in renormalization and rapidity scales, via a pair of coupled evolution equations. [...]
arXiv:2307.06704; CERN-OPEN-2023-016.- Geneva : CERN, 2023-09-15 - 5 p. - Published in : Phys. Lett. B 845 (2023) 138182 Fulltext: 2307.06704 - PDF; Publication - PDF; Preprint: PDF;

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2023-06-23
10:35
Search for $CP$ violation in the phase space of $D^0 \to \pi^-\pi^+\pi^0$ decays with the energy test / LHCb Collaboration
A search for $CP$ violation in $D^0 \to \pi^-\pi^+\pi^0$ decays is reported, using $pp$ collision data collected by the LHCb experiment from 2015 to 2018 corresponding to an integrated luminosity of 6$fb^{-1}$. An unbinned model-independent approach provides sensitivity to local $CP$ violation within the two-dimensional phase space of the decay. [...]
arXiv:2306.12746; CERN-EP-2023-103; LHCb-PAPER-2023-005.- Geneva : CERN, 2023-09-20 - 24 p. - Published in : JHEP 2309 (2023) 129 Fulltext: document - PDF; 2306.12746 - PDF; Related data file(s): ZIP;

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2023-06-21
16:56
Measurement of CP asymmetries and branching fraction ratios of B$^{−}$ decays to two charm mesons / LHCb Collaboration
The $CP$ asymmetries of seven $B^-$ decays to two charm mesons are measured using data corresponding to an integrated luminosity of $9\text{fb}^{-1}$ of proton-proton collisions collected by the LHCb experiment. Decays involving a $D^{*0}$ or $D^{*-}_s$ meson are analysed by reconstructing only the $D^0$ or $D^-_s$ decay products. [...]
arXiv:2306.09945; LHCb-PAPER-2023-007; CERN-EP-2023-104.- Geneva : CERN, 2023-09-28 - 29 p. - Published in : JHEP 2309 (2023) 202 Fulltext: 2306.09945 - PDF; document - PDF; Related data file(s): ZIP; Supplementary information: ZIP; Supplementary material: PDF;

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2023-06-19
10:35
Study of the Bose-Einstein correlations of same-sign pions in proton-lead collisions / LHCb Collaboration
Correlations of same-sign charged particles are analysed using proton-lead collision data collected by the LHCb experiment at a nucleon-nucleon centre-of-mass energy of 5.02 $\textrm{TeV}$, corresponding to an integrated luminosity of 1.06 nb$^{-1}$. Bose-Einstein correlations are observed in the form of an enhancement of pair production for same-sign charged pions with a small four-momentum difference squared. [...]
arXiv:2306.09755; LHCb-PAPER-2023-002; CERN-EP-2023-096.- Geneva : CERN, 2023-09-26 - 29 p. - Published in : JHEP 2309 (2023) 172 Fulltext: 2306.09755 - PDF; document - PDF; Publication - PDF; Related data file(s): ZIP;

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2023-06-07
08:44
Evidence for the decays $B^{0}\rightarrow\bar{D}^{(*)0}\phi$ and updated measurements of the branching fractions of the $B^{0}_{s}\rightarrow\bar{D}^{(*)0}\phi$ decays / LHCb Collaboration
Evidence for the decays $B^{0}\rightarrow\bar{D}^{0}\phi$ and $B^{0} \rightarrow \bar{D}^{*0}\phi$ is reported with a significance of 3.6$\,\sigma$ and 4.3$\,\sigma$, respectively. The analysis employs $pp$ collision data at centre-of-mass energies $\sqrt{s}=7$, 8 and 13 TeV collected by the LHCb detector and corresponding to an integrated luminosity of 9 $\rm{fb}^{-1}$ [...]
arXiv:2306.02768; LHCb-PAPER-2023-003,CERN-EP-2023-077; CERN-EP-2023-077; LHCB-PAPER-2023-003; LHCB-PAPER-2023-003.- Geneva : CERN, 2023-10-20 - 26 p. - Published in : JHEP 2310 (2023) 123 Fulltext: 2306.02768 - PDF; document - PDF; Related data file(s): ZIP;

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2023-05-31
10:45
Associated production of prompt $J/\psi$ and $\mathit{\Upsilon}$ mesons in $pp$ collisions at $\sqrt{s}=13\,\mathrm{TeV}$ / LHCb Collaboration
The associated production of prompt $J/\psi$ and $\mathit{\mathit{\Upsilon}}$ mesons in $pp$ collisions at a centre-of-mass energy of $\sqrt{s}=13\,\mathrm{TeV}$ is studied using LHCb data, corresponding to an integrated luminosity of $4\,\mathrm{fb}^{-1}$. The measurement is performed for $J/\psi$ ($\mathit{\Upsilon}$) mesons with a transverse momentum $p_{\mathrm{T}}<10\,(30)\mathrm{GeV}/c$ in the rapidity range $2.0 < y < 4.5$. [...]
arXiv:2305.15580; LHCb-PAPER-2022-047; CERN-EP-2023-078.- Geneva : CERN, 2023-08-17 - 24 p. - Published in : JHEP 2308 (2023) 093 Fulltext: 2305.15580 - PDF; document - PDF; Related data file(s): ZIP;

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2023-05-26
10:31
Measurement of the mass difference and relative production rate of the $\Omega^-_b$ and $\Xi^-_b$ baryons / LHCb Collaboration
The mass difference between the $\Omega^-_b$ and $\Xi^-_b$ baryons is measured using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9 \, \textrm{fb}^{-1}$, and is found to be \begin{equation} m(\Omega^-_b)- m(\Xi^-_b) = 248.54 \pm 0.51 \textrm{(stat)} \pm 0.38 \textrm{(syst)} \, \textrm{MeV}/c^2. \end{equation} The mass of the $\Omega^-_b$ baryon is measured to be \begin{equation} m(\Omega^-_b)= 6045.9 \pm 0.5 \textrm{(stat)} \pm 0.6 \textrm{(syst)} \, \textrm{MeV}/c^2. [...]
arXiv:2305.15329; LHCb-PAPER-2022-053; CERN-EP-2023-086.- Geneva : CERN, 2023-09-01 - 23 p. - Published in : Phys. Rev. D 108 (2023) 052008 Fulltext: Publication - PDF; 2305.15329 - PDF; Related data file(s): ZIP;

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