917 research outputs found
Was There a Quiet Revolution? Belarus After the 2006 Presidential Election
No full textThe 2006 presidential election in Belarus mobilized a large cross-section of society to protest against the Lukashenko regime. Although unprecedented, the mass mobilization was short-lived, failing to develop into another kind of coloured revolution in the region. The key to our understanding of the endurance of Lukashenko's regime seems to lie in its internal environment, and notably, in the seemingly contradictory feature of the Belarusian electorate. Not only do they fully identify with the president, thus effectively legitimizing his politics and policies; they also do so knowingly, through their strategic learning of how to survive and even thrive under Lukashenko's regime. This type of learning, however, may not necessarily lead to a critical reflection of the regime's malpractice, and thus is unlikely to challenge its foundations
Search for CP violation using (T)over-cap-odd correlations in B0 → p(p)over-barK+ π- decays
No full textA search for CP and P violation in charmless four-body B0→pp ̄K+π- decays is performed using triple-product asymmetry observables. It is based on proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV, corresponding to a total integrated luminosity of 8.4 fb-1. The CP- and P-violating asymmetries are measured both in the integrated phase space and in specific regions. No evidence is seen for CP violation. P-parity violation is observed at a significance of 5.8 standard deviations
Measurement of the Nuclear Modification Factor and Prompt Charged Particle Production in p-Pb and pp Collisions at root s(NN )=5 TeV
No full textThe production of prompt charged particles in proton-lead collisions and in proton-proton collisions at the nucleon-nucleon center-of-mass energy root s(NN) = 5 TeV is studied at LHCb as a function of pseudorapidity (eta) and transverse momentum (p(T) ) with respect to the proton beam direction. The nuclear modification factor for charged particles is determined as a function of eta between -4.8 < eta < -2.5 (backward region) and 2.0 < eta < 4.8 (forward region), and p(T) between 0.2 < p(T) < 8.0 GeV/c. The results show a suppression of charged particle production in proton-lead collisions relative to proton-proton collisions in the forward region and an enhancement in the backward region for p(T) larger than 1.5 GeV/c. This measurement constrains nuclear PDFs and saturation models at previously unexplored values of the parton momentum fraction down to 10(-6)
Search for CP violation using T ^ -odd correlations in B0 →p p ̄ K+π- decays
No full textA search for CP and P violation in charmless four-body B0→pp ̄K+π- decays is performed using triple-product asymmetry observables. It is based on proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV, corresponding to a total integrated luminosity of 8.4 fb-1. The CP- and P-violating asymmetries are measured both in the integrated phase space and in specific regions. No evidence is seen for CP violation. P-parity violation is observed at a significance of 5.8 standard deviation
Measurement of the Branching Fractions B (B0 →p p ̄ p p ̄) and B (Bs0 →p p ̄ p p ̄)
No full textSearches for the rare hadronic decays B-0 -> p (p) over barp (p) over bar and B-s(0) -> p (p) over barp (p) over bar are performed using proton-proton collision data recorded by the LHCb experiment and corresponding to an integrated luminosity of 9 fb-1. Significances of 9.3 sigma and 4.0 sigma, including statistical and systematic uncertainties, are obtained for the B-0 -> p (p) over barp (p) over bar and B-s(0) -> p (p) over barp (p) over bar signals, respectively. The branching fractions are measured relative to the topologically similar normalization decays B-0 -> J/psi(-> p (p) over bar )K*(0)(-> K+ pi(-) ) and B-s(0) -> J/psi(-> p (p) over bar )X phi(-> K+ K- ). The branching fractions are measured to be B(B-0 -> p (p) over barp (p) over bar) = (2.2 +/- 0.4 +/- 0.1 +/- 0.1) x 10(-8) and B(B-s(0) -> p (p) over barp (p) over bar) = (2.3 +/- 1.0 +/- 0.2 +/- 0.1) x 10(-8). In these measurements, the first uncertainty is statistical, the second is systematic, and the third one is due to the external branching fraction of the normalization channel
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