41,398 research outputs found
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
No full textThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
Branching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+
No full textAn analysis of B+ → K0
Sπ+ and B+ → K0
S K+ decays is performed with the LHCb experiment. The pp
collision data used correspond to integrated luminosities of 1 fb−1 and 2 fb−1 collected at centre-ofmass
energies of
√
s = 7 TeV and
√
s = 8 TeV, respectively. The ratio of branching fractions and the
direct CP asymmetries are measured to be B(B+ → K0
S K+
)/B(B+ → K0
Sπ+
) = 0.064 ± 0.009 (stat.) ±
0.004 (syst.), ACP(B+ → K0
Sπ+
) = −0.022 ± 0.025 (stat.) ± 0.010 (syst.) and ACP(B+ → K0
S K+
) =
−0.21 ± 0.14 (stat.) ± 0.01 (syst.). The data sample taken at
√
s = 7 TeV is used to search for
B+
c
→ K0
S K+ decays and results in the upper limit ( fc · B(B+
c
→ K0
S K+
))/( fu · B(B+ → K0
Sπ+
)) <
5.8 × 10−2 at 90% confidence level, where fc and fu denote the hadronisation fractions of a ¯b
quark
into a B+
c or a B+ meson, respectively
Measurement of b-hadron masses
No full textMeasurements of b-hadron masses are performed with the exclusive decay modes B +→J/ψK +, B 0→J/ψK +, B0→J/ψKS0, Bs0→J/ψφ and Λb0→J/ψΛ using an integrated luminosity of 35pb -1 collected in pp collisions at a centre-of-mass energy of 7 TeV by the LHCb experiment. The momentum scale is calibrated with J/ψ→μ +μ - decays and verified to be known to a relative precision of 2 ×10 -4 using other two-body decays. The results are more precise than previous measurements, particularly in the case of the Bs0 and Λb0 masses
O Pedrinho de Monteiro Lobato, Pedrinho de Lourenço Filho: dois intelectuais e dois brasis
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências da Educação, Programa de Pós-Graduação em Educação, Florianópolis, 2014.No final do ano de 1921 a editora da Revista do Brasil publicou um livro infantil do intelectual Monteiro Lobato (1882-1948), O Saci, onde emerge Pedrinho, seu personagem menino que passou a fazer parte das aventuras do Sítio do Picapau Amarelo. Trinta e dois anos mais tarde, 1953, a Edições Melhoramentos lançou Pedrinho, o primeiro volume da coleção de livros didáticos Série de leitura graduada Pedrinho do intelectual Lourenço Filho (1897-1970). A série é protagonizada pelo personagem menino nos quatro livros de leitura da coleção. Os dois Pedrinhos apresentam características semelhantes, tanto pela faixa etária, como por seus perfis de personalidade. Ambos são curiosos, ativos, autônomos, interessados por leituras diversas, gostam de assuntos científicos e são valorizados pela coragem, responsabilidade e honestidade que manifestam. O objetivo desta tese é identificar e analisar as perspectivas socializadoras dos intelectuais para seus personagens meninos e as formas de representação das instituições sociais brasileiras, por seus padrões culturais e valorativos, nos escritos sobre o Brasil e os brasileiros para o público infantil de Monteiro Lobato e Lourenço Filho. Enquanto a socialização do Pedrinho de Lobato se desenvolve nos períodos de férias escolares, o Pedrinho de Lourenço Filho vive a maior parte de suas experiências socializadoras entre a escola, a casa da família e seus arredores. Dessa forma, a hipótese inicial parte da ideia de que o personagem menino de Lourenço Filho está vinculado ao mundo da obrigação, da moral instituída, dos deveres e da ordem enquanto que o Pedrinho de Monteiro Lobato está vinculado ao mundo dos direitos, da liberdade e do prazer que o cenário das férias escolares pode proporcionar. Metodologicamente faz-se um estudo comparado (pesquisa bibliográfica, com destaque à revisão histórica, aplicando-se os princípios fundamentais do conhecimento sociológico) entre os livros da Série de leitura graduada Pedrinho de Lourenço Filho e os livros O Saci, Geografia de Dona Benta e Caçadas de Pedrinho de Monteiro Lobato. Para tanto, as análises estão fundamentadas prioritariamente nos escritos teóricos de Émile Durkheim, Max Weber, Marcel Mauss, Pierre Bourdieu, Quentin Skinner, Peter Berger, Sérgio Buarque de Holanda e Roberto DaMatta, entre outros cientistas sociais. A pesquisa assinala como os intelectuais Monteiro Lobato e Lourenço Filho se inserem no campo educacional e literário brasileiro, por suas trajetórias, lugares ocupados, campos poronde transitaram e as redes de sociabilidade tecidas por cada um deles. Seus Pedrinhos percorrem diferentes e semelhantes Brasis retratados nas perspectivas do arcaico e do moderno para cada intelectual. Enquanto o Brasil do Pedrinho de Lobato é um país de contradições, o Brasil do Pedrinho de Lourenço Filho é uma nação harmoniosa. Os dois Pedrinhos são idealizações de dois intelectuais brasileiros, num País que se modernizava nas primeiras décadas do século XX em meio a um processo de escolarização tardia. Os personagens são representações de meninos essencialmente brasileiros contextualizados em tempos e lugares de um Brasil interpretado por cada um de seus idealizadores, os intelectuais paulistas e brasileiros, Monteiro Lobato e Lourenço Filho.Abstract : In late 1921 Revista do Brasil (Brazil?s Magazine) published O Saci (The Saci), an article by intellectual Monteiro Lobato, in which we are introduced to Pedrinho (Little Peter), his boy character who later became part of the roster in the adventures of Sítio do Picapau Amarelo (Yellow Woodpecker Ranch). Thirty-two years later, in 1953, Melhoramentos Publishing released Pedrinho, first in the Série de leitura graduada Pedrinho (Little Peter Gradated Series) collection of textbooks from intellectual Lourenço Filho (1897-1970). The main character in this four-book series is a boy named Pedrinho. Both Pedrinhos display common traits of age or personality. Both are curious, active, autonomous, keen on assorted reading subjects, enjoy scientific matters and are valued on their courage, responsibility and honesty. The goal with this thesis is to identify and analyze the socializing perspectives of the intellectuals towards their boy characters and the representation of the Brazilian social institutions, by means of their cultural and value standards, in the writings on Brazil and the Brazilian people for the young audiences of Monteiro Lobato Lourenço Filho. While the socializing of Lobato's Pedrinho happens during school break, Loureço FIlhos' Pedrinho lives most of his socializing experiences in school, his family's home, and their surroundings. As such, the initial hypothesis comes from the idea that Lourenço Filho's boy character is linked to the world of duty, of institutionalized morals, and of order, meanwhile Lobato?s Pedrinho is linked to world of rights, of freedom and pleasure that the school break backdrop can provide. As for methodology, one makes a comparative study (literature research, with attention to history, putting in practice fundamental principles of sociologic knowledge) between the Série de leitura graduada Pedrinho books and Monteiro Lobato?s O Saci, Geografia da Dona Benta (Miss Benta?s Geography) and Caçadas de Pedrinho (Pedrinho's Hunting Trips). For that matter, the analysis is based upon the writings of Émile Durkheim, Max Weber, Marcel Mauss, Pierre Bourdieu, Quentin Skinner, Peter Berger, Sérgio Buarque de Holanda and Roberto DaMatta, among other social scientists. This research points out how the intellectuals Monteiro Lobato and Lourenço Filho enter the Brazilian education and literature field, through their careers, positions held, knowledge fields walked through, and networking. Their Pedrinhos cross both different and similar Brazils, portrayed in the differencebetween each intellectual's vision of archaic and modern. While the Brazil of Lobato?s Pedrinho is a country of contradictions, the one of Lourenço Filho's Pedrinho is a nation in harmony. Both Pedrinhos are idealizations of their Brazillian intellectuals, in a country facing modernization in the first decades of the 20th century among a lagging schooling process. The characters are representations of essentially Brazilian boys placed in times and places of a Brazil interpreted by each one of their idealizers, Paulistano Brazilian itellectuals Monteiro Lobato and Lourenço Filho
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
No full textThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
Calycomyza rolandrae Monteiro & Esposito 2017
No full text<i>Calycomyza rolandrae</i> Monteiro & Esposito, 2017 <p> <i>Calycomyza rolandrae</i> Monteiro & Esposito, 2017: 575.</p> <p> <b>Diagnosis.</b> Wing length 2.0– 2.1 mm. Fronto-orbital predominantly yellowish, greyish in the upper half; face greyish; pedicel brown with margin yellowish; legs brown, with apex of femur and base of tibia yellow in the fore leg; calypter greyish, fringe brown. Aedeagus (Fig. 1–3 in Monteiro & Esposito 2017): basiphallus slightly sclerotized; mesophallus slender with two plate-like extensions basally and distal end bent ventrally in lateral view; distiphallus conic with two medial process long, fused and about the same length as the distiphallus.</p> <p> <b>Host-plant.</b> Asteraceae— <i>Rolandra fruticosa</i> (L.) Kuntze.</p> <p> <b>Distribution.</b> Brazil.</p> <p> <b>Material examined.</b> <b>BRAZIL, Pará state, Belém:</b> Universidade Federal Rural da Amazônia (UFRA), 1º27′13.8″S, 48º26′43.8″W, 14-I-1994, M.C. Esposito [collector], ex leaf of <i>Rolandra fruticosa</i> (♂); Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA), 1º26′06.4″S, 48º26′58.1″W, 25-IV-1994, M.C. Esposito [collec- tor], ex leaf of <i>Rolandra fruticosa</i> (♂); same location, 25-II-1994, M.C. Esposito [collector], ex leaf of <i>Rolandra fruticosa</i> (2 ♂); same location, 18-III-1994, M.C. Esposito [collector]; 2 ♀, same location, 25-II-1994, M.C. Es- posito [collector], ex leaf of <i>Rolandra fruticosa</i> (2 ♀).</p> <p> <b>Comments.</b> According to Spencer (1990), many of the <i>Calycomyza</i> species that mine leaves of Asteraceae and Lamiaceae present similarities in the shape of genitalia, expecially in the aedeagus (usually a tubular mesophallus and a distiphallus with lobes separated forming a tubule distally), forming a informal species group (<i>C. humeralis</i> group in Spencer (1990) and <i>C. jucunda</i> group in Sasakawa (1994)) without phylogenetics analysis that support it.. <i>Calycomyza rolandrae</i> presents a similar pattern in aedeagus, differing from the others by the mesophallus not enlarged basally and the shape of the extensions present in the distiphallus, stoutest than other species and with same length of didtiphallus.</p>Published as part of <i>Monteiro, Nilton Juvencio Santiago, Barbosa, Rodrigo Rendeiro & Esposito, Maria Cristina, 2019, Agromyzidae (Diptera: Schizophora) in the state of Pará: new species and new records in Brazil, pp. 151-182 in Zootaxa 4624 (2)</i> on pages 168-169, DOI: 10.11646/zootaxa.4624.2.1, <a href="http://zenodo.org/record/3259200">http://zenodo.org/record/3259200</a>
Measurement of the CKM angle gamma from a combination of B->Dh analyses
No full textA combination of three LHCb measurements of the CKM angle gamma is presented. The decays B->DK and B->Dpi are used, where D denotes an admixture of D0 and D0-bar mesons, decaying into K+K-, pi+pi-, K+-pi-+, K+-pi-+pi+-pi-+, KSpi+pi-, or KSK+K- final states. All measurements use a dataset corresponding to 1.0 fb-1 of integrated luminosity. Combining results from B->DK decays alone a best-fit value of gamma = 72.0 deg is found, and confidence intervals are set gamma in [56.4,86.7] deg at 68% CL, gamma in [42.6,99.6] deg at 95% CL. The best-fit value of gamma found from a combination of results from B->Dpi decays alone, is gamma = 18.9 deg, and the confidence intervals gamma in [7.4,99.2] deg or [167.9,176.4] deg at 68% CL, are set, without constraint at 95% CL. The combination of results from B->DK and B->Dpi decays gives a best-fit value of gamma = 72.6 deg and the confidence intervals gamma in [55.4,82.3] deg at 68% CL, gamma in [40.2,92.7] deg at 95% CL are set. All values are expressed modulo 180 deg, and are obtained taking into account the effect of D0-D0bar mixing
Observations of Bºs→ψ(2S)η and Bº(s)→ψ(2S)π+π- decays
No full textFirst observations of the B0s
→ψ(2S)η, B0 →ψ(2S)π
+
π
− and B0s
→ψ(2S)π
+
π
− decays are made
using a dataset corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment in
proton–proton collisions at a centre-of-mass energy of
√
s = 7 TeV. The ratios of the branching fractions
of each of the ψ(2S) modes with respect to the corresponding J/ψ decays are
B(B0s
→ψ(2S)η)
÷
B(B0s
→J/ψη)
= 0.83± 0.14 (stat)±0.12 (syst) ±0.02 (B),
;
B(B0→ψ(2S)π
+
π
−
)
÷
B(B0→J/ψπ
+
π
−
)
= 0.56± 0.07 (stat)±0.05 (syst)± 0.01 (B),
;
B(B0s
→ψ(2S)π
+
π
−
)
÷
B(B0s
→J/ψπ
+
π
−
)
= 0.34± 0.04 (stat)±0.03 (syst)± 0.01 (B),
where the third uncertainty corresponds to the uncertainties of the dilepton branching fractions of the J/ψ
and ψ(2S) meson decays
Search for B-c(+) decays to two charm mesons
No full textA search for decays of B-c(+) mesons to two charm mesons is performed for the first time using data corresponding to an integrated luminosity of 3.0 fb(-1), collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV. The decays considered are B-c(+)-> D-(s)(()*())(+) (D) over bar (()*()0) and Bc(+)-> D-(s)(()*D-)+(()*())(0), which are normalised to high-yield B+-> D-(s)(+)(D) over bar (0)decays. No evidence for a signal is found and limits are set on twelve B-c(+) decay modes. (C) 2018 The Author(s). Published by Elsevier B.V
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