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EP Preprints

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2021-02-05
19:42
Observation of new resonances decaying to $J/ \psi K^{+}$and $J \psi\phi$
The first observation of exotic states with a new quark content ccus decaying to the $J/\psi K^{+}$ final state is reported with high significance from an amplitude analysis of the $B^{+} \to J/\psi \phi K^{+} $ decay [...]
CERN-EP-2021-025 ; LHCB-PAPER-2020-044. - 2021.
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2021-01-05
10:04
Angular analysis of the $B^{+}\rightarrow K^{\ast+}\mu^{+}\mu^{-}$ decay
We present an angular analysis of the $B^{+}\rightarrow K^{\ast+}(\rightarrow K_{S}^{0}\pi^{+})\mu^{+}\mu^{-}$ decay using 9$\,\mbox{fb}^{-1}$ of $pp$ collision data collected with the LHCb experiment. [...]
arXiv:2012.13241 ; LHCb-PAPER-2020-041 ; CERN-EP-2020-239. - 2021. - 35 p.
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2021-01-05
09:46
Observation of the $B_s^0 \rightarrow D^{\ast \pm} D^{\mp}$ decay / LHCb Collaboration
A search for the $B^0_s \!\rightarrow D^{*\pm} D^\mp$ decay is performed using proton-proton collision data at centre-of-mass energies of $7$, $8$ and $13\,\text{TeV}$ collected by the LHCb experiment, corresponding to an integrated luminosity of $9\,\text{fb}^{-1}$. [...]
arXiv:2012.11341 ; LHCb-PAPER-2020-037 ; CERN-EP-2020-230. - 2021. - 18 p.
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2021-01-04
13:51
Measurement of CP violation in the decay $B^{+} \rightarrow K^{+} \pi^{0}$ / LHCb Collaboration
A measurement of direct CP violation in the decay $B^{+} \rightarrow K^{+} \pi^{0}$ is reported using a data sample corresponding to an integrated luminosity of 5.4 $\textrm{fb}^{-1}$, collected with the LHCb experiment at a center-of-mass energy of $\sqrt{s}=13$ TeV. [...]
arXiv:2012.12789 ; LHCb-PAPER-2020-040 ; CERN-EP-2020-242. - 2021. - 18 p.
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2021-01-04
13:37
Evidence of a $J/\psi \varLambda$ structure and observation of excited $\varXi^-$ states in the $\varXi_b^-\to J/\psi \varLambda K^-$ decay / LHCb Collaboration
First evidence of a structure in the $J/\psi \varLambda$ invariant mass distribution is obtained from an amplitude analysis of $\varXi_b^- \to J/\psi \varLambda K^-$ decays. [...]
arXiv:2012.10380 ; LHCb-PAPER-2020-039 ; CERN-EP-2020-233. - 2021. - 20 p.
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2020-12-18
10:36
Measurement of $C\!P$ observables in $B^\pm \to D^{(*)} K^\pm$ and $B^\pm \to D^{(*)} \pi^\pm$ decays using two-body $D$ final states / LHCb Collaboration
Measurements of $C\!P$ observables in $B^\pm \rightarrow D^{(*)} K^\pm$ and $B^\pm \rightarrow D^{(*)} \pi^\pm$ decays are presented, where $D^{(*)}$ indicates a neutral $D$ or $D^*$ meson that is an admixture of meson and anti-meson states. [...]
arXiv:2012.09903 ; LHCb-PAPER-2020-036 ; CERN-EP-2020-225 ; LHCB-PAPER-2020-036. - 2020. - 36 p.
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2020-12-10
14:24
Observation of $CP$ violation in two-body $B_{(\mathrm{s})}^{\,0}$-meson decays to charged pions and kaons / LHCb Collaboration
The time-dependent $CP$ asymmetries of $B^0\to \pi^+\pi^-$ and $B^0_\mathrm{s}\!\to K^+K^-$ decays are measured using a data sample of $pp$ collisions corresponding to an integrated luminosity of 1.9 fb$^{-1}$, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. [...]
arXiv:2012.05319 ; LHCb-PAPER-2020-029 ; CERN-EP-2020-215 ; LHCB-PAPER-2020-029. - 2020. - 44 p, 44 p.
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2020-12-07
15:32
Search for long-lived particles decaying to $e^{\pm} \mu^{\mp} \nu$ / LHCb Collaboration
Long-lived particles decaying to $e^\pm \mu^\mp \nu$, with masses between 7 and 50 GeV/c$^2$ and lifetimes between 2 and 50 ps, are searched for by looking at displaced vertices containing electrons and muons of opposite charges. [...]
arXiv:2012.02696 ; LHCb-PAPER-2020-027 ; CERN-EP-2020-212. - 2020. - 23 p.
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2020-11-30
12:03
Observation of the $\varLambda^{0}_{b}\to\varLambda^{+}_{c}K^{+}K^{-}\pi^{-}$ decay / LHCb Collaboration
The $\varLambda^{0}_{b}\to\varLambda^{+}_{c}K^{+}K^{-}\pi^{-}$ decay is observed for the first time using a data sample of proton-proton collisions at centre-of-mass energies of $\sqrt{s}=7$ and 8 $\rm{TeV}$ collected by the $\mbox{LHCb}$ detector, corresponding to an integrated luminosity of $3{\rm{fb}^{-1}}$. [...]
arXiv:2011.13738 ; LHCb-PAPER-2020-028 ; CERN-EP-2020-209 ; LHCB-PAPER-2020-028 ; LHCB-PAPER-2020-028. - 2020. - 20 p.
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2020-11-25
14:42
Measurement of the CKM angle $\gamma$ and $B_s^0-\overline{B_s^0}$ mixing frequency with $B_s^0 \to D_s^{\mp} h^{\pm} \pi^{\pm}\pi^{\mp}$ decays / LHCb Collaboration
The CKM angle $\gamma$ is measured for the first time from mixing-induced $CP$ violation between $B^0_s \rightarrow D_s^\mp K^\pm \pi^\pm \pi^\mp$ and $\bar{B}^0_s \rightarrow D_s^\pm K^\mp \pi^\mp \pi^\pm$ decays reconstructed in proton-proton collision data corresponding to an integrated luminosity of 9 ${\rm fb}^{-1}$ recorded with the LHCb detector. [...]
arXiv:2011.12041 ; LHCb-PAPER-2020-030 ; CERN-EP-2020-214 ; LHCB-PAPER-2020-030. - 2020. - 45 p.
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