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EP Preprints

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2019-04-10
11:16
Observation of a narrow pentaquark state, $P_c(4312)^+$, and of two-peak structure of the $P_c(4450)^+$ / LHCb Collaboration
A narrow pentaquark state, $P_c(4312)^+$, decaying to $J/\psi p$ is discovered with a statistical significance of $7.3\sigma$ in a data sample of $\Lambda_b^0\to J/\psi p K^-$ decays which is an order of magnitude larger than that previously analyzed by the LHCb collaboration. [...]
arXiv:1904.03947 ; LHCb-PAPER-2019-014 CERN-EP-2019-058 ; LHCB-PAPER-2019-014. - 2019.
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2019-04-03
11:16
Measurements of $CP$ asymmetries in charmless four-body $\Lambda^0_b$ and $\Xi_b^0$ decays
A search for $CP$ violation in charmless four-body decays of $\Lambda^0_b$ and $\Xi_b^0$ baryons with a proton and three charged mesons in the final state is performed. [...]
CERN-EP-2019-013 ; LHCB-PAPER-2018-044. - 2019.
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2019-04-01
11:42
Observation of an excited $B_c^+$ state / LHCb Collaboration
Using $pp$ collision data corresponding to an integrated luminosity of $8.5\,\mathrm{fb}^{-1}$ recorded by the LHCb experiment at centre-of-mass energies of $\sqrt{s} = 7$, $8$ and $13\mathrm{\,Te\kern -0.1em V}$, the observation of an excited $B_c^+$ state in the $B_c^+\pi^+\pi^-$ invariant-mass spectrum is reported. [...]
arXiv:1904.00081 ; CERN-EP-2019-050 ; LHCb-PAPER-2019-007 ; LHCB-PAPER-2019-007. - 2019. - 17 p.
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2019-04-01
09:46
Near-threshold $D\bar{D}$ spectroscopy and observation of a new charmonium state / LHCb Collaboration
Using proton-proton collisiondata, corresponding to an integrated luminosity of 9 fb$^{-1}$, collected with the~LHCb detector between 2011 and 2018, a new narrow charmonium state, the $X(3842)$ resonance, is observed in the decay modes $X(3842)\rightarrow D^0\bar{D}^0$ and $X(3842)\rightarrow D^+D^-$. [...]
arXiv:1903.12240 ; CERN-EP-2019-047 ; LHCb-PAPER-2019-005 ; LHCB-PAPER-2019-005. - 2019. - 23 p.
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2019-03-22
09:21
Search for lepton-universality violation in $B^+\to K^+\ell^+\ell^-$ decays
A measurement of the ratio of branching fractions of the decays $B^+\to K^+\mu^+\mu^-$ and $B^+\to K^+e^+e^-$ is presented. [...]
CERN-EP-2019-043 ; LHCB-PAPER-2019-009. - 2019.
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2019-03-21
08:49
Observation of $C\!P$ violation in charm decays / LHCb Collaboration
A search for charge-parity ($C\!P$) violation in $D^0 \to K^- K^+$ and $D^0 \to \pi^- \pi^+$ decays is reported, using $pp$ collision data corresponding to an integrated luminosity of 6 $\mathrm{fb}^{-1}$ collected at a center-of-mass energy of 13 TeV with the LHCb detector. [...]
arXiv:1903.08726 ; LHCb-PAPER-2019-006 ; CERN-EP-2019-042 ; LHCB-PAPER-2019-006. - 2019. - 18 p.
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2019-03-14
14:52
Measurement of the $CP$-violating phase $\phi_s$ from $B_{s}^{0}\to J/\psi\pi^+\pi^-$ decays in 13 TeV $pp$ collisions / LHCb Collaboration
Decays of $B_{s}^{0}$ and $\overline{B}{}_{s}^{0}$ mesons into $J/\psi\pi^+\pi^-$ final states are studied in a data sample corresponding to 1.9 fb$^{-1}$ of integrated luminosity collected with the LHCb detector in 13 TeV $pp$ collisions. [...]
arXiv:1903.05530 ; CERN-EP-2019-037 ; LHCb-PAPER-2019-003 ; LHCB-PAPER-2019-003. - 2019. - 24 p.
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2019-03-08
09:57
Measurement of the mass difference between neutral charm-meson eigenstates / LHCb Collaboration
We report a measurement of the mass difference between neutral charm-meson eigenstates using a novel approach that enhances sensitivity to this parameter. [...]
arXiv:1903.03074 ; CERN-EP-2019-032 ; LHCb-PAPER-2019-001 ; LHCB-PAPER-2019-001. - 2019. - 20 p.
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2019-03-05
09:57
Search for $CP$ violation in $D^+_s\to K_S^0\pi^+$, $D^+\to K_S^0K^+$ and $D^+\to\phi\pi^+$ decays / LHCb Collaboration
A search for charge-parity ($CP$) violation in Cabibbo-suppressed $D^+_s\to K_S^0\pi^+$, $D^+\to K_S^0K^+$ and $D^+\to\phi\pi^+$ decays is reported using proton-proton collision data, corresponding to an integrated luminosity of 3.8 fb$^{-1}$, collected at a center-of-mass energy of 13 TeV with the LHCb detector. [...]
arXiv:1903.01150 ; LHCb-PAPER-2019-002 ; CERN-EP-2019-027 ; LHCB-PAPER-2019-002. - 2019. - 17 p.
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2019-02-22
13:40
Amplitude analysis of $B^{0}_{s} \rightarrow K^{0}_{\textrm{S}} K^{\pm}\pi^{\mp}$ decays / LHCb Collaboration
The first untagged decay-time-integrated amplitude analysis of $B^{0}_{s} \rightarrow K^{0}_{\textrm{S}} K^{\pm}\pi^{\mp}$ decays is performed using a sample corresponding to $3.0\,$fb$^{-1}$ of $pp$ collision data recorded with the LHCb detector during 2011 and 2012. [...]
arXiv:1902.07955 ; LHCb-PAPER-2018-045 ; CERN-EP-2019-017 ; LHCB-PAPER-2018-045. - 2019. - 27 p.
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