# LHCb Conference Contributions

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

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

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

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

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

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;

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

2016-09-28
10:30
 $CP$-violating asymmetries from the decay-time distribution of prompt $D^0 \to K^+K^-$ and $D^0 \to \pi^+\pi^-$ decays in the full LHCb Run~1 data sample. Measurement using yield asymmetries in bins of decay time. /LHCb Collaboration Time-dependent $CP$ asymmetries in the decay rates of the singly Cabibbo-suppressed decays $D^0 \to K^+K^-$ and $D^0 \to \pi^+\pi^-$ are measured in $pp$ collision data at centre-of-mass energies of $7$ and $8\,\mathrm{TeV}$ collected by the LHCb detector, corresponding to an integrated luminosity of $3\,\mathrm{fb}^{-1}$. The strong-interaction decay $D^{*+} \to D^0\pi^+$ is used to infer the flavour of the $D^0$ mesons at production. [...] LHCb-CONF-2016-009; CERN-LHCb-CONF-2016-009.- Geneva : CERN, 2016 - 14. Fulltext: LHCb-CONF-2016-009 - PDF; figs - ZIP; In : The 8th International workshop on CHARM physics (CHARM 2016), Bologna, Italy, 5 - 9 Sep 2016

2016-09-28
10:19
 Dalitz plot analysis of the $D^+ \rightarrow K^- K^+ K^+$ decay with the isobar model /LHCb Collaboration This note presents a study of the $K^-K^+$ S-wave amplitude in doubly Cabibbo-suppressed ${D^+ \rightarrow K^- K^+ K^+}$ decays performed using $2 \text{fb}^{-1}$ of data collected by the LHCb detector in $pp$ collisions at $8~\text{TeV}$ centre-of-mass energy. The Dalitz plot is studied under the assumption of the isobar model for resonance scattering [...] LHCb-CONF-2016-008; CERN-LHCb-CONF-2016-008.- Geneva : CERN, 2016 - 28. Fulltext: LHCb-CONF-2016-008 - PDF; Figs - ZIP; In : The 8th International workshop on CHARM physics (CHARM 2016), Bologna, Italy, 5 - 9 Sep 2016

2016-08-22
17:00
 Central exclusive production of $J/\psi$ and $\psi(2S)$ mesons in pp collisions at $\sqrt{s}=13$ TeV /LHCb Collaboration A measurement is made of the central exclusive production of $J/\psi$ and $\psi(2S)$ mesons in $pp$ collisions at a centre-of-mass energy of 13 TeV. Backgrounds are significantly reduced compared to previous measurements made at lower energies through the use of new forward shower counters [...] LHCb-CONF-2016-007; CERN-LHCb-CONF-2016-007.- Geneva : CERN, 2016 - 16. Fulltext: lhcb_conf_2016_007 - PDF; LHCb-CONF-2016-007 - ZIP; In : 38th International Conference on High Energy Physics, Chicago, IL, USA, 03 - 10 Aug 2016