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LHCb Papers

Darreres entrades:
2018-07-18
10:00
Search for $C\!P$ violation in $\Lambda^0_b \to p K^-$ and $\Lambda^0_b \to p \pi^-$ decays / LHCb Collaboration
A search for $C\!P$ violation in $\Lambda^0_b \to p K^-$ and $\Lambda^0_b \to p \pi^-$ decays is presented using a sample of $pp$ collisions collected with the LHCb detector and corresponding to an integrated luminosity of 3.0 fb$^{-1}$. [...]
arXiv:1807.06544 ; LHCb-PAPER-2018-025 ; CERN-EP-2018-189 ; LHCB-PAPER-2018-025.
- 2018.
00019 Distributions of (top) momentum, (middle) transverse momentum and (bottom) pseudorapidity for (left) protons from \Lb decays and (right) \Lb baryons. The distributions are background-subtracted and normalised to unit area. Below each plot the ratio between the two distributions corresponding to \LbTopK and \LbToppi decays is also shown. - 00014 Distributions of (top) momentum, (middle) transverse momentum and (bottom) pseudorapidity for (left) protons from \Lb decays and (right) \Lb baryons. The distributions are background-subtracted and normalised to unit area. Below each plot the ratio between the two distributions corresponding to \LbTopK and \LbToppi decays is also shown. - 00017 Distributions of (top) momentum, (middle) transverse momentum and (bottom) pseudorapidity for (left) protons from \Lb decays and (right) \Lb baryons. The distributions are background-subtracted and normalised to unit area. Below each plot the ratio between the two distributions corresponding to \LbTopK and \LbToppi decays is also shown. - 00015 Distributions of (top) momentum, (middle) transverse momentum and (bottom) pseudorapidity for (left) protons from \Lb decays and (right) \Lb baryons. The distributions are background-subtracted and normalised to unit area. Below each plot the ratio between the two distributions corresponding to \LbTopK and \LbToppi decays is also shown. - 00018 Distributions of (top) momentum, (middle) transverse momentum and (bottom) pseudorapidity for (left) protons from \Lb decays and (right) \Lb baryons. The distributions are background-subtracted and normalised to unit area. Below each plot the ratio between the two distributions corresponding to \LbTopK and \LbToppi decays is also shown. - 00016 Distributions of (top) momentum, (middle) transverse momentum and (bottom) pseudorapidity for (left) protons from \Lb decays and (right) \Lb baryons. The distributions are background-subtracted and normalised to unit area. Below each plot the ratio between the two distributions corresponding to \LbTopK and \LbToppi decays is also shown. - 00013 Invariant-mass distributions: (top left) $m_{\proton \Km}$, (top right) $m_{\antiproton \Kp}$, (bottom left) $m_{\proton \pim}$ and (bottom right) $m_{\antiproton \pip}$ for candidates passing the (top) \SpK and (bottom) \Sppi selections. The results of the fits are superimposed. - 00011 Invariant-mass distributions: (top left) $m_{\proton \Km}$, (top right) $m_{\antiproton \Kp}$, (bottom left) $m_{\proton \pim}$ and (bottom right) $m_{\antiproton \pip}$ for candidates passing the (top) \SpK and (bottom) \Sppi selections. The results of the fits are superimposed. - 00010 Invariant-mass distributions: (top left) $m_{\proton \Km}$, (top right) $m_{\antiproton \Kp}$, (bottom left) $m_{\proton \pim}$ and (bottom right) $m_{\antiproton \pip}$ for candidates passing the (top) \SpK and (bottom) \Sppi selections. The results of the fits are superimposed. - 00012 Invariant-mass distributions: (top left) $m_{\proton \Km}$, (top right) $m_{\antiproton \Kp}$, (bottom left) $m_{\proton \pim}$ and (bottom right) $m_{\antiproton \pip}$ for candidates passing the (top) \SpK and (bottom) \Sppi selections. The results of the fits are superimposed. - Fulltext - Related data file(s) - Supplementary Information - Fulltext - Fulltext

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2018-07-16
15:53
Measurement of $\Upsilon$ production in $pp$ collisions at $\sqrt{s}=13$ TeV / LHCb Collaboration
The production cross-sections of $\Upsilon(1S)$, $\Upsilon(2S)$ and $\Upsilon(3S)$ mesons in proton-proton collisions at $\sqrt{s}=13$ TeV are measured with a data sample corresponding to an integrated luminosity of $277\pm11~\rm{pb}^{-1}$ recorded by the LHCb experiment in 2015. [...]
LHCB-PAPER-2018-002 ; CERN-EP-2018-054 ; arXiv:1804.09214 ; LHCB-PAPER-2018-002.
- 2018. - 26 p.
Fulltext - Related data file(s) - Full text - Article from SCOAP3

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2018-07-06
10:57
First observation of the doubly charmed baryon decay $\Xi_{cc}^{++} \rightarrow \Xi_{c}^{+} \pi^{+}$ / LHCb Collaboration
The doubly charmed baryon decay $\Xi_{cc}^{++} \rightarrow \Xi_{c}^{+} \pi^{+}$ is observed for the first time, with a statistical significance of $5.9\sigma$, confirming a recent observation of the baryon in the $\Lambda_c^{+} K^{-} \pi^{+} \pi^{+}$ final state [...]
LHCb-PAPER-2018-026 ; CERN-EP-2018-172 ; LHCB-PAPER-2018-026 ; CERN-EP-2018-172 ; arXiv:1807.01919 ; LHCB-PAPER-2018-026.
- 2018. - 17 p.
Fulltext - Related data file(s) - Supplementary information - Full text

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2018-07-06
10:51
Measurement of the $\Omega_c^0$ baryon lifetime / LHCb Collaboration
We report a measurement of the lifetime of the $\Omega_c^0$ baryon using proton-proton collision data at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb$^{-1}$ collected by the LHCb experiment. [...]
LHCb-PAPER-2018-028 ; CERN-EP-2018-175 ; arXiv:1807.02024 ; LHCB-PAPER-2018-028 ; CERN-EP-2018-175 ; LHCB-PAPER-2018-028.
- 2018. - 17 p.
Fulltext - Related data file(s) - Supplementary information - Fulltext

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2018-06-29
15:46
Measurement of angular and $C\!P$ asymmetries in $D^0 \to \pi^+\pi^-\mu^+\mu^-$ and $D^0 \to K^+K^-\mu^+\mu^-$ decays / LHCb Collaboration
The first measurements of the forward-backward asymmetry of the dimuon pair ($A_{FB}$), the triple-product asymmetry ($A_{2\phi}$), and the charge-parity-conjugation asymmetry ($A_{CP}$), in $D^0\to\pi^+\pi^-\mu^+\mu^-$ and $D^0\to K^+K^-\mu^+\mu^-$ decays are reported. [...]
CERN-EP-2018-162 ; LHCb-PAPER-2018-020 ; arXiv:1806.10793 ; CERN-EP-2018-162 ; LHCB-PAPER-2018-020 ; LHCB-PAPER-2018-020.
- 2018. - 15 p.
Fulltext - Related data file(s) - Fulltext - Supplementary information

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2018-06-28
12:03
Observation of the decay $\overline{B_s^0} \rightarrow \chi_{c2} K^+ K^- $ / LHCb Collaboration
The $\overline{B_s^0} \rightarrow \chi_{c2} K^+ K^- $ decay mode is observed and its branching fraction relative to the corresponding $\chi_{c1}$ decay mode, in a $\pm 15 \textrm{MeV}/c^2$ window around the $\phi$ mass, is found to be $$\frac{\mathcal{B}(\overline{B_s^0} \rightarrow \chi_{c2} K^+ K^-) }{ \mathcal{B}(\overline{B_s^0} \rightarrow \chi_{c1} K^+K^-)} = (17.1 \pm 3.1 \pm 0.4 \pm 0.9)\%,$$ where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the branching fractions of radiative $\chi_c$ decays. [...]
LHCb-PAPER-2018-018 ; CERN-EP-2018-160 ; arXiv:1806.10576 ; LHCB-PAPER-2018-018.
- 2018. - 20 p, 20 p.
Fulltext - Related data file(s) - Supplementary information

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2018-06-26
11:08
Search for beautiful tetraquarks in the $\Upsilon(1S)\mu^+\mu^-$ invariant-mass spectrum / LHCb Collaboration
The $\Upsilon(1S)\mu^+\mu^-$ invariant-mass distribution is investigated for a possible exotic meson state composed of two $b$ quarks and two $\overline{b}$ quarks, $X_{b\overline{b}b\overline{b}}$. [...]
LHCb-PAPER-2018-027 ; CERN-EP-2018-163 ; arXiv:1806.09707 ; LHCB-PAPER-2018-027 ; CERN-EP-2018-163 ; LHCB-PAPER-2018-027.
- 2018. - 21 p.
Fulltext - Related data file(s) - Fulltext

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2018-06-21
14:15
Observation of the decay $\Lambda^0_b\rightarrow\psi(2S)p\pi^-$ / LHCb Collaboration
The Cabibbo-suppressed decay $\Lambda^0_b\rightarrow\psi(2S)p\pi^-$ is observed for the first time using a data sample collected by the LHCb experiment in proton-proton collisions corresponding to 1.0, 2.0 and 1.9fb$^{-1}$ of integrated luminosity at centre-of-mass energies of 7, 8 and 13TeV, respectively. [...]
CERN-EP-2018-156 ; LHCb-PAPER-2018-022 ; arXiv:1806.08084 ; CERN-EP-2018-156 ; LHCB-PAPER-2018-022 ; LHCB-PAPER-2018-022.
- 2018. - 16 p.
Fulltext - Related data file(s) - Supplementary information - Fulltext

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2018-06-13
16:55
Measurement of $Z\rightarrow\tau^+\tau^-$ production in proton-proton collisions at $\sqrt{s} = 8$ TeV / LHCb Collaboration
A measurement of the $Z\rightarrow\tau^+\tau^-$ production cross-section is presented using data, corresponding to an integrated luminosity of 2 fb$^{-1}$, from $pp$ collisions at $\sqrt{s}=8$ TeV collected by the LHCb experiment. [...]
CERN-EP-2018-147 ; LHCB-PAPER-2018-016 ; arXiv:1806.05008 ; LHCB-PAPER-2018-016.
- 2018. - 19 p.
Related data file(s) - Fulltext - Preprint

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2018-06-11
15:02
Central exclusive production of $J/\psi$ and $\psi(2S)$ mesons in $pp$ collisions at $\sqrt{s}=13~$TeV / LHCb Collaboration
Measurements are reported of the central exclusive production of $J/\psi$ and $\psi(2S)$ mesons in $pp$ collisions at a centre-of-mass energy of 13$\ \rm {TeV}$. [...]
LHCB-PAPER-2018-011 ; CERN-EP-2018-152 ; arXiv:1806.04079 ; LHCB-PAPER-2018-011.
- 2018. - 27 p.
Fulltext - Related data file(s) - Full text

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