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EP Preprints

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2019-05-16
15:50
Search for the lepton-flavour-violating decays $B^{0}_{s}\to\tau^{\pm}\mu^{\mp}$ and $B^{0}\to\tau^{\pm}\mu^{\mp}$ / LHCb Collaboration
A search for $B^{0}_{s}\to\tau^{\pm}\mu^{\mp}$ and $B^{0}\to\tau^{\pm}\mu^{\mp}$ decays is performed using data corresponding to an integrated luminosity of 3 fb$^{-1}$ of proton-proton collisions, recorded with the LHCb detector in 2011 and 2012. [...]
arXiv:1905.06614 ; CERN-EP-2019-076 ; LHCb-PAPER-2019-016 ; LHCB-PAPER-2019-016. - 2019. - 15 p.
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2019-05-16
14:53
Amplitude analysis of the $B^0_{(s)} \to K^{*0} \overline{K}^{*0}$ decay and measurement of its relative branching fraction relative to the $B_s^0 \to K^{*0} \overline{K}^{*0}$ decay / LHCb Collaboration
The $B^0 \to K^{*0} \overline{K}^{*0}$ and $B^0_s \to K^{*0} \overline{K}^{*0}$ decays are studied using proton-proton collision data corresponding to an integrated luminosity of 3fb$^{-1}$. [...]
arXiv:1905.06662 ; LHCb-PAPER-2019-004 CERN-EP-2019-063 ; LHCB-PAPER-2019-004. - 2019.
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2019-05-16
14:31
Measurement of the mixing-induced and $CP$-violating observables of $B^0_s\to\phi\gamma$ decays / LHCb Collaboration
A time-dependent analysis of the $B_s^0 \to \phi\gamma$ decay rate is performed to determine the $CP$-violating observables $S_{\phi\gamma}$ and $C_{\phi\gamma}$, and the mixing-induced observable $\mathcal{A}^{\Delta}_{\phi\gamma}$. [...]
arXiv:1905.06284 ; LHCb-PAPER-2019-015; CERN-EP-2019-077 ; LHCB-PAPER-2019-015. - 2019.
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2019-05-09
11:08
A search for $\Xi_{cc}^{++}\to D^+pK^-\pi^+$ decays / LHCb Collaboration
A search for the $\it{\Xi}^{++}_{cc}$ baryon through the $\it{\Xi}^{++}_{cc} \rightarrow D^{+} p K^{-} \pi^{+}$ decay is performed with a data sample corresponding to an integrated luminosity of 1.7 $\mathrm{fb}^{-1}$ recorded by the LHCb experiment in $pp$ collisions at a centre-of-mass energy of 13 TeV [...]
arXiv:1905.02421 ; LHCb-PAPER-2019-011 ; CERN-EP-2019-067 ; LHCB-PAPER-2019-011. - 2019. - 20 p, 20 p.
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2019-05-06
17:27
Measurement of charged hadron production in $Z$-tagged jets in proton-proton collisions at $\sqrt{s}=8$ TeV / LHCb Collaboration
The production of charged hadrons within jets recoiling against a $Z$ boson is measured in proton-proton collision data at $\sqrt{s}=8$ TeV recorded by the LHCb experiment. [...]
arXiv:1904.08878 ; CERN-EP-2019-065 ; LHCb-PAPER-2019-012 ; LHCB-PAPER-2019-012. - 2019. - 17 p.
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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. - 26 p.
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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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2019-03-21
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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