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EP Preprints

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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
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. [...]
CERN-EP-2019-042 ; LHCB-PAPER-2019-006. - 2019.
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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
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. [...]
CERN-EP-2019-037 ; LHCB-PAPER-2019-003. - 2019.
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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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2019-02-19
15:12
Measurement of $b$-hadron fractions in 13 TeV $pp$ collisions / LHCb Collaboration
The production fractions of $\overline{B}{_s^0}$ and $\Lambda_b^0$ hadrons, normalized to the sum of $B^-$ and $\overline{B}{^0}$ fractions, are measured in 13 TeV pp collisions using data collected by the LHCb experiment, corresponding to an integrated luminosity of 1.67fb$^{-1}$. [...]
arXiv:1902.06794 ; CERN-EP-2019-016 ; LHCb-PAPER-2018-050 ; LHCB-PAPER-2018-050. - 2019. - 23 p.
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2019-02-18
13:51
Dalitz Plot analysis of the $D^+ \to K^- K^+ K^+$ decay / LHCb Collaboration
The resonant structure of the doubly Cabibbo-suppressed decay $D^+\to K^-K^+K^+$ is studied for the first time. [...]
arXiv:1902.05884 ; LHCb-PAPER-2018-039 ; CERN-EP-2018-336 ; LHCB-PAPER-2018-039. - 2019. - 37 p.
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2019-02-15
15:26
Observation of $B^0_{(s)} \to J/\psi p \overline{p}$ decays and precision measurements of the $B^0_{(s)}$ masses / LHCb Collaboration
The first observation of the decays $B^0_{(s)} \to J/\psi p \overline{p}$ is reported, using proton-proton collision data corresponding to an integrated luminosity of $5.2{\text{fb}}^{-1}$, collected with the LHCb detector. [...]
arXiv:1902.05588 ; CERN-EP-2019-006 ; LHCb-PAPER-2018-046 ; LHCB-PAPER-2018-046. - 2019. - 19 p.
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2019-02-15
10:02
Measurement of $B^+$, $B^0$ and $\Lambda_b^0$ production in $p\mkern 1mu\mathrm{Pb}$ collisions at $\sqrt{s_{NN}} = 8.16 \ \rm TeV$ / LHCb Collaboration
The production of $B^+$, $B^0$ and $\Lambda_b^0$ hadrons is studied in proton-lead collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_\mathrm{NN}}=8.16\,{\rm TeV}$ recorded with the LHCb detector at the LHC. [...]
arXiv:1902.05599 ; LHCb-PAPER-2018-048; CERN-EP-2019-010 ; LHCb-PAPER-2018-048 ; CERN-EP-2019-010 ; LHCB-PAPER-2018-048. - 2019. - 31 p.
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