B→K∗ℓ+ℓ−B\to K^* \ell^+ \ell^- decays at large recoil in the Standard Model: a theoretical reappraisal

We critically reassess the theoretical uncertainties in the Standard Model calculation of the $B \to K^* \ell^+ \ell^-$ observables, focusing on the low $q^2$ region. We point out that even optimized observables are affected by sizable uncertainties, since hadronic contributions generated by current-current operators with charm are difficult to estimate, especially for $q^2 \sim 4 m_c^2\simeq 6.8$ GeV$^2$. We perform a detailed numerical analysis and present both predictions and results from the fit obtained using most recent data. We find that non-factorizable power corrections of the expected order of magnitude are sufficient to give a good description of current experimental data within the Standard Model. We discuss in detail the $q^2$ dependence of the corrections and their possible interpretation as shifts of the Standard Model Wilson coefficients.Comment: 33 pages, 7 figures, 11 tables. v2: fixed numerical error in S4 and typos; added discussion of the impact of future measurements; conclusions unchange

Effetti della densità di semina e della concimazione azotata sulla produzione del triticale

In the year 1981-82 a factorial trial of nitrogen fertilization (80, 120, 160, kg ha-1of N) and sowing rates (300, 350, 400 viable seeds per m2) has been carried out on three triticale lines in two environments of Sardinia (Oristano and Sassari). Equal N rates have been applied to a durum wheat at 350 sowing rate. The limited water availability in the soil, especially during the grain filling, has negatively affected the DM accumulation processes more markedly in the high ear n. per m2 thesis. In both sites the n. of plants increased with increase in seed rates and there was a greater correspondence between theoretical and reaI density at Oristano. Indipendently of the varieties and N rates, at Sassari yields have been slightly increasing with increase in sowing rates to which variations in the ear n. per m2 correspond in the same way, while at Oristano significant production increase has been achieved only by N80 rate owing to the seed rate. At Sassari, indipendent of sowing rates, triticale grain yields have been slightly increasing with increase in N rates. At Oristano production variation has not been achieved with lower sowing rates, decrease has been observed with more then N 80 kg ha-1 at higher sowing rate. A slightly higher triticale grain production compared with durum wheat has been achieved restricted to Oristano

On Flavourful Easter eggs for New Physics hunger and Lepton Flavour Universality violation

Within the standard approach of effective field theory of weak interactions for $\Delta B = 1$ transitions, we look for possibly unexpected subtle New Physics effects, here dubbed "flavourful Easter eggs". We perform a Bayesian global fit using the publicly available HEPfit package, taking into account state-of-the-art experimental information concerning these processes, including the suggestive measurements from LHCb of $R_{K}$ and $R_{K^{*}}$, the latter available only very recently. We parametrize New Physics contributions to $b \to s$ transitions in terms of shifts of Wilson coefficients of the electromagnetic dipole and semi-leptonic operators, assuming CP-conserving effects, but allowing in general for violation of lepton flavour universality. We show how optimistic/conservative hadronic estimates can impact quantitatively the size of New Physics extracted from the fit. With a conservative approach to hadronic uncertainties we find nonzero New Physics contributions to Wilson coefficients at the level of $\sim 3\sigma$, depending on the model chosen. Furthermore, given the interplay between hadronic contributions and New Physics effects in the leptonic vector current, a scenario with nonstandard leptonic axial currents is comparable to the more widely advocated one with New Physics in the leptonic vector current.Comment: 27 pages, 6 figures and 5 tables. v2: numerical results and plots replaced with higher statistics MC runs, references added. v3: final version to appear in EPJ

Variazioni stagionali del potenziale idrico fogliare, osmotico e di pressione nel grano duro

In 1982 the seasonal changes of leaf Ψ, Ψs and Ψpof five durum wheat cultivars grown under field conditions was monitored using a psycrometric apparatus. There was found to be a general increase in pressure during the floreal differentiation-earing period. No particular differences were observed either between the tall and dwarf varieties or between those with bloom or not. The relation between the values ot Ψp and leaf Ψ, taken from the earing period to the inltial stage of leaf senescence das not fallow a linear regression in all the varieties. According to an analysis of the differing values of Ψ p and Ψ, it seems that the varieties «Tibula» and «Creso» are more resistant to water stress than the other varieties, although these findings require further convalidation

Risposta produttiva del mais e del sorgo agli stress idrici indotti in diverse fasi del ciclo biologico

During 1982 a comparative test was conducted between a maize hybrid and a sorghum hybrid of similar growing cycle duration, to study the effect of water stress induced during various phases of the biological cycle. Yield response and the analysis of physiological parameters confirm the higher resistence of sorghum to water stress presumably through mechanisms of osmotic adjustment. Nel corso del 1982 è stata attuata una prova di confronto tra un ibrido di mais e di sorgo di simile durata del ciclo colturale al fine di studiare gli effetti dello stress idrico indotto in diverse fasi del ciclo biologico. I risultati produttivi e l'analisi dei parametri fisiologici presi in considerazione confermano la superiore capacità del sorgo ad "adattarsi" a condizioni di limitata disponibilità idrica del terreno, presumibilmente attraverso meccanismi di aggiustamento osmotico. Nel mais da granella i decrementi di produzione sono risultati simili sospendendo temporaneamente le erogazioni idriche o durante la fase di levata o di maturazione lattea. Si rileva, infine, che con ottimali disponibilità idriche, il mais ha confermato la sua superiorità produttiva nei confronti del sorgo

Nanofluids Application as Nanolubricants in Heat Pumps Systems

In the last years, various applications have been proposed for nanofluids in the Heating, Ventilation, Air Conditioning and Refrigeration (HVACR) field; their use as primary and secondary fluids, also as lubricants, was kept into account to improve the systems performance. The present work was developed to test the applicability of nanofluids as lubricants in the compressors of the heat pump systems, with the purpose to experimentally detect the possible positive effects of nanolubricants. Several nanolubricants, formed by Polyolester (POE) or mineral oil, as base fluid, and titanium oxide (TiO2) or single wall carbon nano-horns (SWCNH), as nanoparticles, were studied in a dedicated test rig. In contrast with the published literature, no improvement was detected using nanofluids instead of commercial oil. All results will be deeply discussed in the paper

Lessons from the B0,+^{0,+} K∗0,+^{*0,+} μ+^{+} μ−^{-} angular analyses

We perform an analysis within the Standard Model of B0,+→K*0,+μ+μ− decays in light of the recent measurements from the LHCb experiment, showing that new data strengthen the need for sizable hadronic contributions and correlations among them. We then extend our analysis to new physics via the Standard Model effective theory, and carry out a state-of-the-art fit of available b→sℓ+ℓ− data, including possible hadronic contributions. We find the case of a fully left-handed operator standing out as the simplest scenario with a significance of almost 6σ