21 research outputs found

    BγγB \to \gamma \gamma in an ACD model

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    We present a full calculation of the amplitudes for Bd[s]γγB_{d[s]} \to \gamma \gamma in a simple ACD model that extends an incomplete one in a previous paper. We find cancellations between the contributions from different KK towers and a small decrease relative to the SM predictions. It is conjectured that radiative QCD corrections might actually lead to an enhancement in the branching ratios and {\bf CP} asymmetries, but no more than modest ones.Comment: 3 pages, 2 figure

    B_{s,d}\to \gamma\gamma decay in the model with one universal extra dimension

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    We estimate the beyond the Standard Model (SM) contribution to the B_{s,d} \to \gamma\gamma double radiative decay in the framework of the model with one universal extra dimension. This contribution gives a \sim 3 (6)% enhancement of the branching ratio calculated in the SM for B_{s (d)} \to \gamma\gamma.Comment: 5 pages, 1 fig, uses espcrc

    ATLAS detector and physics performance: Technical Design Report, 1

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    Statistical Analysis of the Number of Days with Hail and Damage to Agricultural Crops from it in Kvemo Kartli (Georgia)

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    A statistical analysis of data on the number of days with hail in the warm half of the year (from April to October) in 10 settlements of Kvemo Kartli (Georgia) - Bolnisi, Dmanisi, Gardabani, Manglisi, Marneuli, Rustavi, Sadakhlo, Shulaveri, Tetri Tskaro, Tsalka - is presented. The observation period is from 30 (Sadakhlo) to 93 (Bolnisi) years. In addition, an analysis of data on damaged areas of agricultural crops in 34 locations of the specified region in 1982, 1985-1989 is provided (total 56 cases with hail). In particular, the following results were obtained. The maximum number of days with hail in the warm half-year is observed in Manglisi (16), the minimum - in Rustavi and Sadakhlo (2 each). The maximum average number of days with hail is observed in Manglisi (4.6), the minimum - in Sadakhlo (0.2). The maximum total area of agricultural crops damaged by hail was noted in Asureti (8.15 km²), the minimum in Tbisi (0.2 km²). The maximum area of agricultural crops damaged by hail by 100% was noted in Sadakhlo (6.18 km²), the minimum - in Tbisi (0.07 km²). In the whole region, for one incident with hail, the total area of damage to agricultural crops was 1.64 km², and for 100% - 0.95 km². The results of this work will be used to construct a visual map of the distribution of hail cases and hail damage of agricultural on the territory of Kvemo Kartli
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