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Sincerely, you : letter-writing to change the world
\"This guidebook tells the story of the creation of Savannah's Soldiers, a school-based letter-writing foundation, and provides real-world letter writing advice for young readers\"-- Provided by publisher.
Book
NNLO QCD predictions for Wγ γ Wγγ production at the LHC
Triboson production processes play a crucial role in probing the electroweak sector of the Standard Model, as they involve quartic gauge-boson couplings already at the tree level. With these measurements entering the precision era at the Large Hadron Collider (LHC), accurate theoretical predictions become indispensable. We present the computation of the next-to-next-to-leading-order (NNLO) QCD radiative corrections to the production of a W boson in association with two photons ( Wγ γ Wγγ) at the LHC. The calculation is exact, except for the finite part of the two-loop contribution, which is included in the leading-colour approximation. Predictions for the fiducial cross section and selected kinematic distributions are provided at a centre-of-mass energy of √s̅=13 s=13 TeV, under standard experimental selection cuts. In line with observations for other multiboson processes involving direct photons, we find sizable NNLO corrections that enhance the next-to-leading-order predictions by about 23% 23%, with residual perturbative uncertainties that can be roughly estimated to be at the 5% 5% level.
Journal Article
The first limit on invisible decays of B_(s) Bs mesons comes from LEP
Motivated by the recent evidence for $$B^+\\rightarrow K^+\\bar{\\nu } \\nu $$ B+→K+ν¯ν decays at Belle II, we point out that fully invisible $$B_d$$ Bd and $$B_s$$ Bs meson decays are strongly constrained by LEP. A reinterpretation of an old inclusive ALEPH search for b-hadron decays with large missing energy allows us to place the limits $$\\textrm{Br}(B_d \\rightarrow \\textrm{invisible}) < 1.4\\times 10^{-4}$$ Br(Bd→invisible)<1.4×10-4 and $$\\textrm{Br}(B_s \\rightarrow \\textrm{invisible}) < 5.6\\times 10^{-4}$$ Br(Bs→invisible)<5.6×10-4, both at $$90\\%$$ 90% CL. The $$B_d$$ Bd limit is only a factor of 6 looser than the world-leading one provided by the BaBar collaboration, while the $$B_s$$ Bs one is the first limit in the literature on this decay mode. These results are relevant in the context of new light states coupled to quarks and exemplify the power of a future Tera-Z factory at FCC-ee to look for B meson decays containing missing energy.
Journal Article
Ship of dolls
It's 1926, and the one thing eleven-year-old Lexie Lewis wants more than anything is to leave Portland, where she is living with her strict grandparents, and rejoin her mother, a carefree singer in San Francisco. Lexie's class has been raising money to ship a doll to the children of Japan in a friendship exchange, and when Lexie learns that the girl who writes the best letter to accompany the doll will be sent to the farewell ceremony in San Francisco, she knows she just has to be the winner.
Book
Writing a business letter
\"Writing is an important skill that kids use almost every day. The goal of the Write it Right series is to make kids writing experts. Writing a Business Letter is full of tips and tricks to help kids craft a professional letter, from forming an opinion to addressing the envelope. This book includes a table of contents, glossary, index, author biography, activities, and instructions\"-- Provided by publisher.
Book
