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LHCb Conference Contributions

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2017-04-24
11:43
Measurement of antiproton production in $p$He collisions at $\sqrt{s_{\scriptscriptstyle\rm NN}}=110$ GeV /LHCb Collaboration
The antiproton production cross-section in collisions of a 6.5 TeV LHC proton beam on helium at rest is measured by the LHCb experiment using the SMOG internal gas target from a dataset corresponding to an integrated luminosity of 0.4 $\mbox{\,nb}^{-1}$. This is the first direct measurement of antimatter production in $p$He collisions, and has important implications for the interpretation of recent results from the PAMELA and AMS-02 experiments, which measure the antiproton component in cosmic rays outside of the Earth's atmosphere..
LHCb-CONF-2017-002; CERN-LHCb-CONF-2017-002.- Geneva : CERN, 2017 - 26. Fulltext: LHCb-CONF-2017-002_Figs - ZIP; LHCb-CONF-2017-002 - PDF;
In : 52nd Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy, 18 - 25 Mar 2017

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2017-03-14
15:42
Measurement of $J/\psi$ and $D^0$ production in $p$Ar collisions at $\sqrt{s_{NN}}=110$ GeV /LHCb Collaboration
The first analysis of heavy flavour production measured by the LHCb experiment in fixed-target mode is presented. The $J/\psi$ and $D^0$ production processes are studied in 6.5 TeV proton-beam-induced reactions on an argon gaseous target. [...]
LHCb-CONF-2017-001; CERN-LHCb-CONF-2017-001.- Geneva : CERN, 2017 - 16. Fulltext: LHCb-CONF-2017-001 - PDF; figsCONFnote - ZIP;
In : The XXVI international conference on ultrarelativistic heavy-ion collisions, Chicago, United States Of America, 6 - 11 Feb 2017

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2017-01-26
10:27
Measurement of time-dependent $C\!P$-violating asymmetries in $B^0\to\pi^+\pi^-$ and $B_s^0\to K^+K^-$ decays at LHCb /LHCb Collaboration
The $C\!P$-violating asymmetries in the decay and in the interference between mixing and decay in the $B^0\to\pi^+\pi^-$ and $B_s^0\to K^+K^-$ modes are measured using a data sample of $pp$ collisions corresponding to an integrated luminosity of 3 fb$^{-1}$, collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. Flavour tagging is performed using only a subset of the current available taggers [...]
LHCb-CONF-2016-018; CERN-LHCb-CONF-2016-018.- Geneva : CERN, 2017 - 25. Fulltext: LHCb-CONF-2016-018_Figures - ZIP; LHCb-CONF-2016-018 - PDF;
In : 9th International Workshop on the CKM Unitarity Triangle, Mumbai, India, 28 Nov - 2 Dec 2016

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2017-01-16
12:17
First observation of a baryonic $B_s^0$ decay /LHCb Collaboration
The first observation of a baryonic $B_s^0$ decay, $B^0_s \to p \bar{\Lambda} K^-$, is reported using proton-proton collision data corresponding to an integrated luminosity of 3.0 $\text {fb}^{-1}$recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The branching fraction is measured to be $$ {\cal B}(B^0_s \to p \bar{\Lambda} K^- + \bar{B}^0_s \to p \bar{\Lambda} K^-) = \left[5.48 \,^{+0.82}_{-0.80} \pm 0.60 \pm 0.51 ({\cal B}) \pm 0.32 (f_s/f_d)\right]\times 10^{-6}\,, $$ where the first uncertainty is statistical and the second systematic, the third uncertainty accounts for the experimental uncertainty on the branching fraction of the $B^0 \to p \bar{\Lambda} \pi^-$ decay used for normalisation, and the fourth uncertainty relates to the knowledge of the ratio of $b$-quark hadronisation probabilities $f_s/f_d$. [...]
LHCb-CONF-2016-016; CERN-LHCb-CONF-2016-016.- Geneva : CERN, 2017 - 16. Fulltext: LHCb-CONF-2016-016 - PDF; LHCb-CONF-2016-016-figures - ZIP;
In : 9th International Workshop on the CKM Unitarity Triangle, Mumbai, India, 28 Nov - 2 Dec 2016

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2017-01-16
11:53
Measurement of $C\!P$ asymmetry in $B_s^0\to D_s^{\mp}K^{\pm}$ decays /LHCb Collaboration
Reported are measurements of the time-dependent $C\!P$ violating observables in $B_s^0\to D_s^{\mp}K^{\pm}$ decays using a dataset corresponding to $3.0\,\text{fb}^{-1}$ of $pp$ collisions recorded with the LHCb detector in Run 1 of the LHC. We measure $C_f = 0.735 \pm 0.142 \pm 0.048$, $S_f = -0.518 \pm 0.202 \pm 0.073$, $S_{\bar{f}} = -0.496 \pm 0.197 \pm 0.071$, $D_f = 0.395 \pm 0.277 \pm 0.122$, $D_{\bar{f}} = 0.314 \pm 0.274 \pm 0.107$, where the uncertainties are statistical and systematic, respectively. [...]
LHCb-CONF-2016-015; CERN-LHCb-CONF-2016-015.- Geneva : CERN, 2017 - 21. Fulltext: LHCb-CONF-2016-015 - PDF; Figs - ZIP;
In : 9th International Workshop on the CKM Unitarity Triangle, Mumbai, India, 28 Nov - 2 Dec 2016

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2017-01-05
12:07
Study of the decay $B^{\pm} \to DK^{*\pm}$ with two-body $D$ decays /LHCb Collaboration
Results on measurement of $CP$-sensitive observables in the decay $B^{\pm} \to DK^{*\pm}$, where $D$ denotes a superposition of $D^0$ and $\overline{D}{^0}$ are presented. Decays of the $D$ meson to $D \to K^-\pi^+, K^-K^+, \pi^-\pi^+, \pi^-K^+$ are used, and the $K^{*\pm}$ is considered in the $K_S^0\pi^{\pm}$ final state. [...]
LHCb-CONF-2016-014; CERN-LHCb-CONF-2016-014.- Geneva : CERN, 2016 - 17. Fulltext: LHCb-CONF-2016-014 - PDF; confFigures - ZIP;
In : 9th International Workshop on the CKM Unitarity Triangle, Mumbai, India, 28 Nov - 2 Dec 2016

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2016-10-14
09:00
Evidence for the rare decay $\Sigma^+ \to p \mu^+ \mu^-$ /LHCb Collaboration
A search for the rare decay $\Sigma^+ \to p \mu^+ \mu^-$ is performed using $pp$ collision data recorded by the LHCb experiment at centre-of-mass energies $\sqrt{s} = 7$ and $8 TeV$, corresponding to an integrated luminosity of $3 ~ \text {fb}^{-1}$. An excess of events is observed with respect to the background expectations with a signal significance of 4.0 standard deviations [...]
LHCb-CONF-2016-013; CERN-LHCb-CONF-2016-013.- Geneva : CERN, 2016 - 13. Fulltext: LHCb-CONF-2016-013-figures - ZIP; LHCb-CONF-2016-013 - PDF;
In : 2016 International Conference on Kaon Physics, Birmingham, United Kingdom, 14 - 17 Sep 2016

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2016-10-14
08:55
Updated limit for the decay $K_{\rm\scriptscriptstyle S}^0\rightarrow\mu^+\mu^-$ /LHCb Collaboration
A search is performed for the decay $K_{\rm\scriptscriptstyle S}^0\rightarrow\mu^+\mu^-$, using the data sample of $pp$ collisions at $\sqrt{s}=8$ TeV collected by the LHCb experiment at the Large Hadron Collider in 2012, corresponding to an integrated luminosity of 2.0 fb$^{-1}$. In the Standard Model, the decay is expected to be suppressed at a level below the experimental sensitivity, but could be enhanced by new sources of $CP$ violation [...]
LHCb-CONF-2016-012; CERN-LHCb-CONF-2016-012.- Geneva : CERN, 2016 - 16. Fulltext: figures - ZIP; LHCb-CONF-2016-012 - PDF;
In : 2016 International Conference on Kaon Physics, Birmingham, United Kingdom, 14 - 17 Sep 2016

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2016-09-30
15:31
Search for the rare decays $B^0_{(s)}\to\tau^+\tau^-$ / De Bruyn, Kristof (Centre National de la Recherche Scientifique (FR)) /LHCb Collaboration
A search for the rare decays $B^0_{(s)}\to\tau^+\tau^-$ is performed using $pp$ collision data, corresponding to an integrated luminosity of 3.0 fb$^{-1}$ collected by the LHCb detector in 2011 and 2012 at centre-of-mass energies of 7 and 8 TeV, respectively. The $\tau$ leptons are reconstructed through the hadronic decay $\tau^+\to\pi^+\pi^-\pi^+\overline\nu_{\tau}$. [...]
LHCb-CONF-2016-011; CERN-LHCb-CONF-2016-011.- Geneva : CERN, 2016 - 18. Fulltext: PDF; Related data file(s): ZIP;

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2016-09-28
12:05
$CP$-violating asymmetries from the decay-time distribution of prompt $D^0 \to K^+ K^-$ and $D^0 \to \pi^+\pi^-$ decays in the full $\mbox{LHCb}$ Run 1 data sample. Measurement using unbinned, acceptance corrected decay-time. /LHCb Collaboration
A study of indirect $CP$ violation in $D^0$ mesons is presented through a measurement of the asymmetry of the effective decay widths of $D^0$ and $\overline{D}^0$ mesons to $CP$ eigenstates. This observable, known as $A_{\Gamma}$, is measured with the $CP$ eigenstates $K^+ K^-$ and $\pi^+ \pi^-$ using data collected in $pp$ collisions by the LHCb experiment in 2012 with an integrated luminosity of $1.9\ \rm fb^{-1}$. [...]
LHCb-CONF-2016-010; CERN-LHCb-CONF-2016-010.- Geneva : CERN, 2016 - 13. Fulltext: Figures - ZIP; LHCb-CONF-2016-010 - PDF;
In : The 8th International workshop on CHARM physics (CHARM 2016), Bologna, Italy, 5 - 9 Sep 2016

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