A search for the rare two-body charmless baryonic decay $B^+ \to p \bar\Lambda$ is performed with $pp$ collision data, corresponding to an integrated luminosity of $3\mbox{\,fb}^{-1}$, collected by ...the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. An excess of $B^+ \to p \bar\Lambda$ candidates with respect to background expectations is seen with a statistical significance of 4.1 standard deviations, and constitutes the first evidence for this decay. The branching fraction, measured using the $B^+ \to K^0_{\mathrm S} \pi^+$ decay for normalisation, is \begin{eqnarray} \mathcal{B}(B^+ \to p \bar\Lambda) & = & ( 2.4 \,^{+1.0}_{-0.8} \pm 0.3 ) \times 10^{-7} \,, \nonumber \end{eqnarray} where the first uncertainty is statistical and the second systematic.
The $B_s^0\pi^\pm$ invariant mass distribution is investigated in order to search for possible exotic meson states. The analysis is based on a data sample recorded with the LHCb detector ...corresponding to $3$ fb$^{-1}$ of $pp$ collision data at $\sqrt{s} = 7$ and $8$ TeV. No significant excess is found, and upper limits are set on the production rate of the claimed $X(5568)$ state. Upper limits are also set as a function of the mass and width of a possible exotic meson decaying to the $B_s^0\pi^\pm$ final state.
A search for $B_s^0 \to \overline{D}^{0} f_{0}(980)$ decays is performed using $3.0\, {\rm fb}^{-1}$ of $pp$ collision data recorded by the LHCb experiment during 2011 and 2012. The $f_{0}(980)$ ...meson is reconstructed through its decay to the $\pi^{+}\pi^{-}$ final state in the mass window $900\, {\rm MeV}/c^{2} < m(\pi^{+}\pi^{-}) < 1080\, {\rm MeV}/c^{2}$. No significant signal is observed. The first upper limits on the branching fraction of $\mathcal{B}(B_s^0 \to \overline{D}^{0} f_{0}(980)) < 3.1\,(3.4) \times 10^{-6}$ are set at $90\,\%$ ($95\,\%$) confidence level.
Journal of High Energy Physics 04 (2019) 063 The resonant structure of the doubly Cabibbo-suppressed decay $D^+ \to
K^-K^+K^+$ is studied for the first time. The measurement is based on a sample
of ...pp-collision data, collected at a centre-of-mass energy of 8 TeV with the
LHCb detector and corresponding to an integrated luminosity of 2 fb$^-1$. The
amplitude analysis of this decay is performed with the isobar model and a
phenomenological model based on an effective chiral Lagrangian. In both models
the S-wave component in the $K^-K^+$ system is dominant, with a small
contribution of the $\phi(1020)$ meson and a negligible contribution from
tensor resonances. The $K^-K^+$ scattering amplitudes for the considered
combinations of spin (0,1) and isospin (0,1) of the two-body system are
obtained from the Dalitz plot fit with the phenomenological decay amplitude.
The LHCb Outer Tracker is a gaseous detector covering an area of \(5\times 6 m^2\) with 12 double layers of straw tubes. The performance of the detector is presented based on data of the LHC Run 2 ...running period from 2015 and 2016. Occupancies and operational experience for data collected in \(p p\), pPb and PbPb collisions are described. An updated study of the ageing effects is presented showing no signs of gain deterioration or other radiation damage effects. In addition several improvements with respect to LHC Run 1 data taking are introduced. A novel real-time calibration of the time-alignment of the detector and the alignment of the single monolayers composing detector modules are presented, improving the drift-time and position resolution of the detector by 20\%. Finally, a potential use of the improved resolution for the timing of charged tracks is described, showing the possibility to identify low-momentum hadrons with their time-of-flight.
The resonant structure of the doubly Cabibbo-suppressed decay \(D^+ \to K^-K^+K^+\) is studied for the first time. The measurement is based on a sample of pp-collision data, collected at a ...centre-of-mass energy of 8 TeV with the LHCb detector and corresponding to an integrated luminosity of 2 fb\(^-1\). The amplitude analysis of this decay is performed with the isobar model and a phenomenological model based on an effective chiral Lagrangian. In both models the S-wave component in the \(K^-K^+\) system is dominant, with a small contribution of the \(\phi(1020)\) meson and a negligible contribution from tensor resonances. The \(K^-K^+\) scattering amplitudes for the considered combinations of spin (0,1) and isospin (0,1) of the two-body system are obtained from the Dalitz plot fit with the phenomenological decay amplitude.
Purpose
The purpose of this paper is to describe a case study from the master program management in nonprofit organizations at the University of Applied Sciences in Osnabrück, Germany and show how ...this case of innovative teaching helps to educate responsible managers for the world of tomorrow.
Design/methodology/approach
The authors developed a model of a think tank to create a surrounding for students to learn about models and theories such as systems thinking and social innovations and work with practical instruments like the business canvas and design thinking. The objective was for the students to work on solutions for societal challenges.
Findings
The main findings were twofold: First, it is clear that the objective of the case was met. The evaluation at the end of both iterations made it clear, that the result is important for the students and something that they can embrace as their own. Second, the students show intense problems with the freedom that they get. It is very interesting how students are primed to perform in the regulation given by professors. Once these frameworks are loosened, they seem lost.
Originality/value
The value lies in the creation of a model that can be used by multiple professors in very different management studies. Through the model students can be taught to solve societal problems.
Although digital media are increasingly important for adolescent athletes, few studies explore their influence on mental health in this population. This study aimed to examine this relationship in ...591 German adolescent athletes (aged 12–19 years) from 42 different sports. Longer daily social media usage was connected to increased negative affect and dysfunctional eating patterns. Similar results were found for cognitive-behavioral symptoms of excessive media usage and mental health. Structural equation modeling revealed these relationships were mediated by social comparison and quality of sleep. Higher athletic performance level was related to increased social comparison, but not to quality of sleep, negative affect, and dysfunctional eating. The negative relationship between excessive media usage and sleep was stronger in competitive and elite than in recreational athletes. Results imply digital media should receive attention when aiming to improve mental health in athletes. Relevant targets for future intervention could be social comparison and sleep.
•Digital and social media are highly relevant to adolescent athletes.•Effects of digital media usage in adolescent athletes are previously unknown.•Social comparison and sleep mediate effect of digital media on mental health.•High-performance athletes show higher social comparison than recreational athletes.•Athletic performance moderates relationship between digital media and sleep quality.
PurposeThe study aims to understand how practicing organizational performance evaluation (OPE) is related to the performance paradox (tensions between creative freedom and survival challenges) in ...“evaluation-hesitant” cultural and creative industries (CCI) organizations.Design/methodology/approachMixed methods research, consisting of moderation analyses and unstructured expert interviews.FindingsA conceptual model is developed to explain how creative freedom and survival challenges affect OPE in “evaluation-hesitant” CCI organizations.Originality/valueThe authors bring a new understanding to the factors that contribute to evaluation-hesitance in CCI. The paper contributes to discussing both the theory of paradox and flow theory in explaining the relations between OPE, creative freedom and survival challenges.
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