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EP Preprints

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2017-09-15
14:53
Precise measurement of the $\chi_{c1}$ and $\chi_{c2}$ resonance parameters with the decays $\chi_{c1,c2}\to J\psi\mu^+\mu^-$ / LHCb Collaboration
The decays $\chi_{c1} \rightarrow J/\psi \mu^+ \mu^-$ and $\chi_{c2} \rightarrow J/\psi \mu^+ \mu^-$ are observed and used to study the resonance parameters of the $\chi_{c1}$ and $\chi_{c2}$ mesons. [...]
CERN-EP-2017-228 ; LHCB-PAPER-2017-036 ; arXiv:1709.04247 ; LHCB-PAPER-2017-036. - 2017. - 17 p.
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2017-09-14
12:21
Measurement of $CP$ violation in $B^0\rightarrow J/\psi K^0_\mathrm{S}$ and $B^0\rightarrow\psi(2S) K^0_\mathrm{S}$ decays / LHCb Collaboration
A measurement is presented of decay-time-dependent $CP$ violation in the decays $B^0\rightarrow J/\psi K^0_\mathrm{S}$ and $B^0\rightarrow\psi(2S) K^0_\mathrm{S}$, where the $J/\psi$ is reconstructed from two electrons and the $\psi(2S)$ from two muons. [...]
CERN-EP-2017-209 ; arXiv:1709.03944 ; LHCB-PAPER-2017-029. - 2017.
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2017-09-12
11:56
Measurement of forward $Z \rightarrow b \bar{b}$ production in $pp$ collisions at $\sqrt{s}=8$ TeVMeasurement of forward $Z \rightarrow b \bar{b}$ production in $pp$ collisions at $\sqrt{s}=8$~TeV / LHCb Collaboration
The decay $Z \rightarrow b \bar{b}$ is reconstructed in $pp$ collision data, corresponding to 2 fb$^{-1}$ of integrated luminosity, collected by the LHCb experiment at a centre-of-mass energy of $\sqrt{s}=8$ TeV. [...]
LHCB-PAPER-2017-024 ; CERN-EP-2017-211 ; arXiv:1709.03458 ; LHCB-PAPER-2017-024-AND-CERN-EP-2017-211 ; LHCB-PAPER-2017-024. - 2017.
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2017-09-08
16:35
Measurement of the shape of the $\Lambda_b^0\to\Lambda_c^+\mu^{-}\overline{\nu}_{\mu}$ differential decay rate / LHCb Collaboration
A measurement of the shape of the differential decay rate and the associated Isgur-Wise function for the decay decay ${\Lambda}^0_b \to \Lambda^+_c \mu^- \bar {\nu} _\mu$ is reported, using data corresponding to 3 fb$^{-1}$ collected with the LHCb detector in proton-proton collisions. [...]
CERN-PH-EP-2017-164 ; LHCB-PAPER-2017-016 ; arXiv:1709.01920 ; LHCB-PAPER-2017-016. - 2017. - 24 p.
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2017-09-08
10:15
Bose-Einstein correlations of same-sign charged pions in the forward region in $pp$ collisions at $\sqrt{s}$ = 7 TeV / LHCb Collaboration
Bose-Einstein correlations of same-sign charged pions, produced in proton-proton collisions at a $7 ~\text {TeV}$ centre-of-mass energy, are studied using a data sample collected by the LHCb experiment. [...]
CERN-EP-2017-203 ; LHCB-PAPER-2017-025 ; arXiv:1709.01769 ; LHCB-PAPER-2017-025. - 2017.
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2017-09-08
10:09
First observation of the rare purely baryonic decay $B^0 \to p \bar{p}$ / LHCb Collaboration
The first observation of the decay of a $B^0$ meson to a purely baryonic final state, $B^0 \to p \bar{p}$, is reported. [...]
LHCB-PAPER-2017-022 ; CERN-EP-2017-190 ; arXiv:1709.01156 ; LHCB-PAPER-2017-022. - 2017.
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2017-09-05
12:23
Measurement of $\Upsilon$ polarizations in $pp$ collisions at $\sqrt{s} = 7$ and $8$ TeV / LHCb Collaboration
The polarization of the $\Upsilon(1S)$, $\Upsilon(2S)$ and $\Upsilon(3S) $mesons, produced in $pp$ collisions at centre-of-mass energies $\sqrt{s}$=7 and 8TeV, is measured using data samples collected by the LHCb experiment, corresponding to integrated luminosities of 1 and 2fb$^{-1}$, respectively. [...]
CERN-EP-2017-210 ; LHCB-PAPER-2017-028 ; arXiv:1709.01301 ; LHCB-PAPER-2017-028. - 2017.
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2017-08-30
09:35
Measurement of the ratio of the $B^0 \to D^{*-} \tau^+ \nu_{\tau}$ and $B^0 \to D^{*-} \mu^+ \nu_{\mu}$ branching fractions using three-prong $\tau$-lepton decays / LHCb Collaboration
The ratio of branching fractions $\mbox{${\cal{R}}(D^{*-})\equiv {\cal{B}}(B^0 \to D^{*-} \tau^+ \nu_{\tau})/{\cal{B}}(B^0 \to D^{*-} \mu^+\nu_{\mu})$}$ is measured using a data sample of proton-proton collisions collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb$^{-1}$. [...]
LHCB-PAPER-2017-017 ; CERN-EP-2017-212 ; arXiv:1708.08856 ; LHCB-PAPER-2017-017-CERN-EP-2017-212 ; LHCB-PAPER-2017-017. - 2017.
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2017-08-22
10:19
Study of $b\bar{b}$ correlations in high energy proton-proton collisions / LHCb Collaboration
Kinematic correlations for pairs of beauty hadrons, produced in high energy proton-proton collisions, are studied. [...]
CERN-EP-2017-178 ; LHCB-PAPER-2017-020 ; arXiv:1708.05994 ; LHCB-PAPER-2017-020. - 2017. - 29 p.
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2017-08-22
09:20
Search for baryon-number-violating $\Xi_b^0$ oscillations / LHCb Collaboration
A search for baryon-number-violating $\Xi_b^0$ oscillations is performed with a sample of $pp$ collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 3 fb$^{-1}$. [...]
LHCB-PAPER-2017-023 ; CERN-EP-2017-189 ; arXiv:1708.05808 ; LHCB-PAPER-2017-023. - 2017.
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