Measurements of differential production cross sections for a Z boson in association with jets in pp collisions at root s=8 TeV

Peer reviewe

Search for the associated production of the Higgs boson with a top-quark pair

A search for the standard model Higgs boson produced in association with a top-quark pair t t ¯ H (tt¯H) is presented, using data samples corresponding to integrated luminosities of up to 5.1 fb −1 and 19.7 fb −1 collected in pp collisions at center-of-mass energies of 7 TeV and 8 TeV respectively. The search is based on the following signatures of the Higgs boson decay: H → hadrons, H → photons, and H → leptons. The results are characterized by an observed t t ¯ H tt¯H signal strength relative to the standard model cross section, μ = σ/σ SM ,under the assumption that the Higgs boson decays as expected in the standard model. The best fit value is μ = 2.8 ± 1.0 for a Higgs boson mass of 125.6 GeV

Measurement of prompt Jψ\psi pair production in pp collisions at \sqrt s = 7 Tev

Production of prompt J/ ψ meson pairs in proton-proton collisions at s s√ = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb −1 . The two J/ ψ mesons are fully reconstructed via their decays into μ + μ − pairs. This observation provides for the first time access to the high-transverse-momentum region of J/ ψ pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/ ψ transverse momentum ( p T J/ ψ ) and rapidity (| y J/ ψ |): | y J/ ψ | 6.5 GeV/ c ; 1.2 4.5 GeV/ c . The total cross section, assuming unpolarized prompt J/ ψ pair production is 1.49 ± 0.07 (stat) ±0.13 (syst) nb. Different assumptions about the J/ ψ polarization imply modifications to the cross section ranging from −31% to +27%

Measurements of the t(t)Overbar charge asymmetry using the dilepton decay channel in pp collisions at root s=7 TeV

The tt¯ charge asymmetry in proton-proton collisions at s√ = 7 TeV is measured using the dilepton decay channel (ee, e μ , or μμ ). The data correspond to a total integrated luminosity of 5.0 fb −1 , collected by the CMS experiment at the LHC. The tt and lepton charge asymmetries, defined as the differences in absolute values of the rapidities between the reconstructed top quarks and antiquarks and of the pseudorapidities between the positive and negative leptons, respectively, are measured to be A C = −0 . 010 ± 0 . 017 (stat . ) ± 0 . 008 (syst . ) and AlepC = 0 . 009 ± 0 . 010 (stat . ) ± 0 . 006 (syst . ). The lepton charge asymmetry is also measured as a function of the invariant mass, rapidity, and transverse momentum of the tt¯ system. All measurements are consistent with the expectations of the standard model

Charged-particle nuclear modification factors in PbPb and pPb collisions at √=sNN=5.02 TeV

The spectra of charged particles produced within the pseudorapidity window |η| < 1 at √ sNN = 5.02 TeV are measured using 404 µb −1 of PbPb and 27.4 pb−1 of pp data collected by the CMS detector at the LHC in 2015. The spectra are presented over the transverse momentum ranges spanning 0.5 < pT < 400 GeV in pp and 0.7 < pT < 400 GeV in PbPb collisions. The corresponding nuclear modification factor, RAA, is measured in bins of collision centrality. The RAA in the 5% most central collisions shows a maximal suppression by a factor of 7–8 in the pT region of 6–9 GeV. This dip is followed by an increase, which continues up to the highest pT measured, and approaches unity in the vicinity of pT = 200 GeV. The RAA is compared to theoretical predictions and earlier experimental results at lower collision energies. The newly measured pp spectrum is combined with the pPb spectrum previously published by the CMS collaboration to construct the pPb nuclear modification factor, RpA, up to 120 GeV. For pT > 20 GeV, RpA exhibits weak momentum dependence and shows a moderate enhancement above unity

Арабское единство. Почему арабы терпят неудачу в единстве, а другие преуспевают?

The Arabs, despite their predecessors, did not succeed in building an effective and influential political force. Trump recognized Jerusalem as the capital of the State of Israel in 2017. He also recognized Israeli sovereignty over the territory of the Syrian Golan in 2019. The dispersion of the Arab position is the biggest proof of the failure of Arab unity. The authors present a brief study on the success of European countries in achieving unity, while the Arabs failed to achieve unity, which has been the goal of gathering Arab countries for many years. The comparative analysis of attempts at Arab unity and the process of European unity was conducted by the authors of the paper. The study is of scientific and practical importance for political scientists and political analysts was performed. The authors ask: Why did the European Union succeed and the Arab Unions failed? Based on the analysis of various theories and concepts of research, the authors of the paper come to meaningful conclusions that may be of interest to a wide circle of readers. Both the European and Arab systems originated in different historical and international contexts, and therefore it was natural for each of them to produce different approaches and mechanisms of complementarity with these contexts. There has been a tendency to praise the European experience and praise it in the Arabic literature, and in return there is criticism of the Arab experience. In this article we will raise many issues concerning Arab unity.Авторы представляют краткое исследование об успехах европейских стран в достижении единства, в то время как арабам не удалось достичь той же цели. Они провели сравнительный анализ попыток арабского единства и процесса европейского единства. Исследование имеет научное и практическое значение для политологов. Авторы задаются вопросом: «Почему Европейский Союз преуспел, а Арабские Союзы потерпели неудачу?». На основе анализа различных теорий и концепций исследования авторы приходят к содержательным выводам, которые могут быть интересны широкому кругу читателей. Как европейская, так и арабская системы возникли в разных исторических и международных контекстах, и поэтому для каждой из них было естественно выработать разные подходы и механизмы взаимодополняемости с этими контекстами. Наблюдается тенденция хвалить европейский опыт и превозносить его в арабской литературе, но на этом фоне существует критика арабского опыта. В этой статье мы поднимаем много вопросов, касающихся арабского единства

Development of IPM Module of Varroa destructor Infesting Apis mellifera in Kashmir

The studies on the “Development of IPM Module of Varroa destructor infesting Apis mellifera in Kashmir” were carried out in an apiary near the vicinity of SKUAST-K, Shalimar, Srinagar during the year 2008 and 2009. The studies on the assessment of damage caused by Varroa destructor revealed that mean mortality of worker brood was 36.80 per cent in case of bees inoculated with 5-mites per bee followed by 29.09 and 19.78 per cent at 3 and 1-mite infestation level during the spring season 2008 and 2009; in case of drone brood, the mean mortality of 54.67 per cent was recorded at 5-mite infestation level followed by 45.48 and 31.39 per cent at 3 and 1-mite infestation level, respectively. However, the mean mortality of 42.22, 33.46 and 22.89 per cent was recorded at 5, 3 and 1-mite infestation level in case of drone brood during the autumn season, 2008 and 2009, whereas, the mean mortality of 52.42, 41.65 and 31.21 per cent was observed at 5, 3 and 1-mite infestation level in drone brood during the autumn season, 2008 and 2009. The mean mite abundance on adult worker bees was 34.04; 26.52 and 15.59 per cent at 5, 3 and 1-mite infestation level whereas in case of drone bees the mean mite abundance of 43.21; 34.43 and 22.51 per cent was observed at 5, 3 and 1-mite infestation level during the spring season 2008 and 2009. The studies revealed that the mean mite abundance of 35.50, 27.23 and 16.36 per cent in adult worker bees at 5, 3 and 1-mite infestation level during the autumn season 2008 and 2009. However, in case of adult drone bees, the mean mite abundance of 45.80, 37.34 and 25.65 per cent was observed at 5, 3 and 1-mite infestation level, respectively during the autumn season 2008 and 2009. The studies on the effect of Varroa destructor mite on the life span of worker bees revealed that the mean mortality of worker bees was 30.80, 21.06 and 10.20 per cent at 5, 3 and 1-mite infestation level, respectively during spring 2008 and 2009. However, during autumn 2008 and 2009, mean mortality of worker bees was 32.06, 21.06 and 10.25 per cent at 5, 3 and 1-mite infestation level. In case of worker bees inoculated with 1-mite, the mean life span was 49.66 days followed by 23.83 and 13.86 days at 3 and 5 mite infestation level, respectively during spring 2008 and 2009, while during autumn season 2008 and 2009, the mean life span of worker bees was 39.50, 22.16 and 13.65 days at 1, 3 and 5-mite infestation level, respectively. In case of drone bees infested with 1, 3 and 5-mites, the respective body weight loss averaged to 7.96, 11.07 and 16.32 per cent. However, in case of adult worker bees infested with 1, 3 and 5-mites, the respective body weight loss averaged to 6.94, 14.58 and 17.76 per cent whereas in case of drone pupae infested with 1, 3 and 5-mites, the respective body weight loss averaged to 11.69, 16.93 and 19.69 per cent. However, in case of worker pupae, the body loss averaged to 11.30, 13.43 and 14.53 per cent at 1, 3 and 5-mite infestation level. The studies on the development of IPM module of Varroa destructor revealed that queen caging and drone trap combs were highly effective in suppressing the mite population as compared to control. The studies revealed that all the chemicals were highly effective against the Varroa destructor mite as compared to control and the efficacy of different chemicals was in the following order – taufluvalinate (Apistan strips, 2 strips/10 frame colony) > formic acid, 85% (@ 35 ml/colony through paper napkins) > thymol (@ 0.3 g/comb) > oxalic acid 3.5% (@ 50 ml of 1:1 sugar solution/colony) > formic acid, 65% (@ 35 ml/colony through cotton wicks) > oxalic acid, 3% (@ 50 ml/colony) > thymol (@ 2.5 g/comb)

Overexpression of the phytochrome B gene from Arabidopsis thaliana increases plant growth and yield of cotton (Gossypium hirsutum)

The phytochrome B (PHYB) gene of Arabidopsis thaliana was introduced into cotton through Agrobacterium tumefaciens. Integration and expression of PHYB gene in cotton plants were confirmed by molecular evidence. Messenger RNA (mRNA) expression in one of the transgenic lines, QCC11, was much higher than those of control and other transgenic lines. Transgenic cotton plants showed more than a two-fold increase in photosynthetic rate and more than a four-fold increase in transpiration rate and stomatal conductance. The increase in photosynthetic rate led to a 46% increase in relative growth rate and an 18% increase in net assimilation rate. Data recorded up to two generations, both in the greenhouse and in the field, revealed that overexpression of Arabidopsis thaliana PHYB gene in transgenic cotton plants resulted in an increase in the production of cotton by improving the cotton plant growth, with 35% more yield. Moreover, the presence of the Arabidopsis thaliana PHYB gene caused pleiotropic effects like semi-dwarfism, decrease in apical dominance, and increase in boll size