27,098 research outputs found
First lattice calculation of the B-meson binding and kinetic energies
No full textWe present the first lattice calculation of the B-meson binding energy \labar and of the kinetic energy -\lambda_1/2 m_Q of the heavy-quark inside the pseudoscalar B-meson. This calculation has required the non-perturbative subtraction of the power divergences present in matrix elements of the Lagrangian operator \bar h D_4 h and of the kinetic energy operator \bar h \vec D^2 h. The non-perturbative renormalisation of the relevant operators has been implemented by imposing suitable renormalisation conditions on quark matrix elements, in the Landau gauge. Our numerical results have been obtained from several independent numerical simulations at \beta=6.0 and 6.2, and using, for the meson correlators, the results obtained by the APE group at the same values of \beta. Our best estimate, obtained by combining results at different values of \beta, is \labar =190 \err{50}{30} MeV. For the \overline{MS} running mass, we obtain \overline {m}_b(\overline {m}_b) =4.17 \pm 0.06 GeV, in reasonable agreement with previous determinations. From a subset of 36 configurations, we were only able to establish a loose upper bound on the b-quark kinetic energy in a B-meson, \lambda_1=\langle B \vert \bar h \vec{D}^{2} h \vert B \rangle /(2 M_B )<~1\, GeV^2. This shows that a much larger statistical sample is needed to determine this important parameter.We present the first lattice calculation of the B-meson binding energy \labar and of the kinetic energy of the heavy-quark inside the pseudoscalar B-meson. This calculation has required the non-perturbative subtraction of the power divergences present in matrix elements of the Lagrangian operator and of the kinetic energy operator . The non-perturbative renormalisation of the relevant operators has been implemented by imposing suitable renormalisation conditions on quark matrix elements, in the Landau gauge. Our numerical results have been obtained from several independent numerical simulations at and , and using, for the meson correlators, the results obtained by the APE group at the same values of . Our best estimate, obtained by combining results at different values of , is \labar =190 \err{50}{30} MeV. For the running mass, we obtain GeV, in reasonable agreement with previous determinations. From a subset of 36 configurations, we were only able to establish a loose upper bound on the -quark kinetic energy in a -meson, 1\, GeV. This shows that a much larger statistical sample is needed to determine this important parameter.We present the first lattice calculation of the B-meson binding energy Λ and of the kinetic energy − λ 1 /2 m Q of the heavy-quark inside the pseudoscalar B-meson. This calculation has required the non-perturbative subtraction of the power divergences present in matrix elements of the Lagrangian operator h − D 4 h and of the kinetic energy operator h − D 2 h . The non-perturbative renormalisation of the relevant operators has been implemented by imposing suitable renormalisation conditions on quark matrix elements, in the Landau gauge. Our numerical results have been obtained from several independent numerical simulations at β = 6.0 and 6.2, and using, for the meson correlators, the results obtained by the APE group at the same values of β. Our best estimate, obtained by combining results at different values of β, is Λ − = 190 −30 +50 MeV . For the MS running mass, we obtain m b ( m b ) = 4.17 ± 0.06 GeV , in reasonable agreement with previous determinations. From a subset of 36 configurations, we were only able to establish a loose upper bound on the b-quark kinetic energy in a B -meson, Λ = 〈B∥ h − D 2 h∥B〉/(2M B ) < 1 GeV 2 . This shows that a much larger statistical sample is needed to determine this important parameter
A High-Statistics Lattice Calculation of and in the meson
No full textWe present a high-statistics lattice calculation of the kinetic energy of the heavy quark inside the -meson and of the chromo-magnetic term , related to the -- mass splitting, performed in the HQET. Our results have been obtained from a numerical simulation based on 600 gauge field configurations generated at , on a lattice volume and using, for the meson correlators, the results obtained with the SW-Clover improved lattice action for the light quarks. For the kinetic energy we found ~GeV, which is interesting for phenomenological applications. We also find GeV, which is about one half of the experimental value. The origin of the discrepancy with the experimental number needs to be clarified.We present a high-statistics lattice calculation of the kinetic energy of the heavy quark inside the -meson and of the chromo-magnetic term , related to the -- mass splitting, performed in the HQET. Our results have been obtained from a numerical simulation based on 600 gauge field configurations generated at , on a lattice volume and using, for the meson correlators, the results obtained with the SW-Clover improved lattice action for the light quarks. For the kinetic energy we found GeV, which is interesting for phenomenological applications. We also find GeV, corresponding to GeV, which is about one half of the experimental value. The origin of the discrepancy with the experimental number needs to be clarified.We present a high-statistics lattice calculation of the kinetic energy of the heavy quark inside the -meson and of the chromo-magnetic term , related to the -- mass splitting, performed in the HQET. Our results have been obtained from a numerical simulation based on 600 gauge field configurations generated at , on a lattice volume and using, for the meson correlators, the results obtained with the SW-Clover improved lattice action for the light quarks. For the kinetic energy we found GeV, which is interesting for phenomenological applications. We also find GeV, corresponding to GeV, which is about one half of the experimental value. The origin of the discrepancy with the experimental number needs to be clarified.We present a high-statistics lattice calculation of the kinetic energy of the heavy quark inside the -meson and of the chromo-magnetic term , related to the -- mass splitting, performed in the HQET. Our results have been obtained from a numerical simulation based on 600 gauge field configurations generated at , on a lattice volume and using, for the meson correlators, the results obtained with the SW-Clover improved lattice action for the light quarks. For the kinetic energy we found GeV, which is interesting for phenomenological applications. We also find GeV, corresponding to GeV, which is about one half of the experimental value. The origin of the discrepancy with the experimental number needs to be clarified.We present a high-statistics lattice calculation of the kinetic energy − λ 1 /2 m b of the heavy quark inside the B -meson and of the chromo-magnetic term A2, related to the B ∗ −B mass splitting, performed in the HQET Our results have been obtained from a numerical simulation based on 600 gauge field configurations generated at β = 6.0, on a lattice volume 24 3 × 40 and using, for the meson correlators, the results obtained with the SW-Clover O ( a ) improved lattice action for the light quarks. For the kinetic energy we found −λ 1 = 〈B| h ̄ (iD) 2 h|B〉/(2M B ) = −(0.09 ± 0.14) GeV 2 , which is interesting for phenomenological applications. We also found λ 2 = 0.07 ± 0.01 GeV 2 , corresponding to M B∗ 2 − M B 2 = 4λ 2 = 0.280 ± 0.060 GeV 2 , which is about one half of the experimental value. The origin of the discrepancy with the experimental number needs to be clarified
Illuminaçao Apologetica do retrato de Morteçor en que aparecem com mais vivas côres os erros do author do novo Methodo, e seu Apologista ...
No full textFecha sacada de la pág.2 y 159Sign.: A-V\p4\sError tipográfico de signatura : a B\b2\s llama B\b3\
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
Current patch test results with the European baseline series and extensions to it from the 'European Surveillance System on Contact Allergy' network, 2007-2008
No full textBACKGROUND: The pattern of contact sensitization to the supposedly most important allergens assembled in the baseline series differs between countries, presumably at least partly because of exposure differences. Objectives. To describe the prevalence of contact sensitization to allergens tested in consecutive patients in the years 2007 and 2008, and to discuss possible differences. METHODS: Data from the 39 departments in 11 European countries comprising the European Surveillance System on Contact Allergy network (www.essca-dc.org) in this period have been pooled and analysed according to common standards. RESULTS: Patch test results with the European baseline series, and country-specific or department-specific additions to it, obtained in 25 181 patients, showed marked international variation. Metals and fragrances are still the most frequent allergens across Europe. Some allergens tested nationally may be useful future additions to the European baseline series, for example methylisothiazolinone, whereas a few long-term components of the European baseline series, namely primin and clioquinol, no longer warrant routine testing. CONCLUSIONS: The present analysis points to 'excess' prevalences of specific contact sensitization in some countries, although interpretation must be cautious if only few, and possibly specialized, centres are representing one country. A comparison as presented may help to target in-depth research into possible causes of 'excess' exposure, and/or consideration of methodological issues, including modifications to the baseline series
A high statistics lattice calculation of the b-meson binding energy
No full textWe present a high statistics lattice calculation of the B--meson binding energy \overline{\Lambda} of the heavy--quark inside the pseudoscalar B--meson. Our numerical results have been obtained from several independent numerical simulations at \beta=6.0, 6.2 and 6.4 and using, for the meson correlators, the results obtained by the APE group at the same values of \beta. Our best estimate, obtained by combining results at different values of \beta, is \overline{\Lambda}=180^{+30}_{-20} MeV. For the \overline{MS} running mass, we obtain \overline{m}_{b}(\overline{m}_{b})=4.15 \pm 0.05 \pm 0.20 GeV, in reasonable agreement with previous determinations. The systematic error is the truncation of the perturbative series in the matching condition of the relevant operator of the Heavy Quark Effective Theory.We present a high statistics lattice calculation of the B -meson binding energy Λ of the heavy-quark inside the pseudoscalar B -meson. Our numerical results have been obtained from several independent numerical simulations at β = 6.0, 6.2 and 6.4, and using, for the meson correlators, the results obtained by the APE group at the same values of β. Our best estimate, obtained by combining results at different values of β, is Λ = 180 −20 +30 MeV. For the MS running mass, we obtain m b ( m b ) = 4.15 ± 0.05 ± 0.20 GeV , in reasonable agreement with previous determinations. The systematic error is the truncation of the perturbative series in the matching condition of the relevant operator of the Heavy Quark Effective Theory.We present a high statistics lattice calculation of the B--meson binding energy of the heavy--quark inside the pseudoscalar B--meson. Our numerical results have been obtained from several independent numerical simulations at , and , and using, for the meson correlators, the results obtained by the APE group at the same values of . Our best estimate, obtained by combining results at different values of , is MeV. For the running mass, we obtain GeV, in reasonable agreement with previous determinations. The systematic error is the truncation of the perturbative series in the matching condition of the relevant operator of the Heavy Quark Effective Theory
Erratum to: Effects of nutraceuticals on quality of life and sexual function of perimenopausal women (Journal of Endocrinological Investigation, (2017), 40, 1, (27-32), 10.1007/s40618-016-0500-2)
No full textUnfortunately, one of the co-author first name was wrongly published in the original version. The complete correct name of the co-author is given below. A. M. C. Rapisarda. The original version of this article is also updated
A theoretical prediction of the B-s meson lifetime difference
No full textWe present the results of a quenched lattice calculation of the operator matrix elements relevant for predicting the B-s width difference. Our main result is (Delta Gamma (Bs)/Gamma (Bs)) = (4.7 +/- 1.5 +/- 1.6) x 10(-2), obtained from tho ratio of matrix elements R(m(b)) = ((B) over bar (0)(s)\Qs\B-s(0)]/[(B) over bar (0)(s)\QL\B-s(0)) = -0.93(3)(-0.01)(+0.00) . R(m(b)) was evaluated from the two relevant B parameters B-S((MS) over bar)(m(b)) = 0.86(2)(-0.02)(+0.02) and B-Bs((MS) over bar)(m(b)) = 0.91(3)(-0.06)(+0.00), which we computed in our simulation
Informetrics on M. N. Srinivas
No full textM. N. Srinivas, the well known sociologist is widely recognised as architect of modern Indian sociology and social anthropology. His publications have been analysed by year, domain, authorship pattern, channels of communication used. Keywords, etc. The results indicate that the papers published by him are of a nature that qualify him to be a 'role model' for the younger generations to emulate.
By the end of 1995, Srinivas had to his credit 144 papers which, included 33 broad papers in sociology and anthropology; 18 papers in social change; 28 papers in village studies; 12 papers on religion; 17 papers on caste and 36 papers of general popular interest. The periods 1958-61 and 1974-77, when Srinivas was 38-41 and 58-61 years old. were his most productive periods with highest publication activity
The shrimp mitochondrial FoF1-ATPase inhibitory factor 1 (IF1)
No full textThe whiteleg shrimp species Litopenaeus vannamei is exposed to cyclic changes of the dissolved oxygen concentration of seawater and must neutralize the adverse effects of hypoxia by using ATP as energy source. In crustaceans, the mitochondrial FOF1-ATP synthase is pivotal to the homeostasis of ATP and function prevalently as a FOF1-ATPase. Hitherto, it is unknown whether these marine invertebrates are equipped with molecules able to control the FOF1-ATPase inhibiting the ATP consumption. In this study, we report two variants of the mitochondrial FOF1-ATPase Inhibitory Factor 1 (IF1) ubiquitously expressed across tissues of the Litopenaeus vannamei transcriptome: the IF1_Lv1 and the IF1_Lv2. The IF1_Lv1, with a full-length sequence of 550 bp, encodes a 104 aa long protein and its mRNA amounts are significantly affected by hypoxia and re-oxygenation. The IF1_Lv2, with a sequence of 654 bp, encodes instead for a protein of 85 aa. Both proteins share a 69 % homology and contain a conserved minimal inhibitory sequence (IATP domain) along with a G-rich region on their N-terminus typical of the invertebrate. In light of this characterization IF1 is here discussed as an adaptive mechanism evolved by this marine species to inhibit the FOF1-ATPase activity and avoid ATP dissipation to thrive in spite of the changes in oxygen tension.Fil: Chimeo, Cindy. Centro de Investigacion en Alimentacion y Desarrollo; MéxicoFil: Fernandez Gimenez, Analia Veronica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencia Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Campanella, Michelangelo. University of London; Reino Unido. University College London; Estados UnidosFil: Mendez Romero, Ofelia. Centro de Investigacion en Alimentacion y Desarrollo; MéxicoFil: Muhlia Almazan, Adriana. Centro de Investigacion en Alimentacion y Desarrollo; Méxic
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