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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
The first limit on invisible decays of \\documentclass12pt{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$B_s$$\\end{document}Bs mesons comes from LEP
Motivated by the recent evidence for
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\\begin{document}$$B^+\\rightarrow K^+\\bar{\\nu } \\nu $$\\end{document}
B
+
→
K
+
ν
¯
ν
decays at Belle II, we point out that fully invisible
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\\begin{document}$$B_d$$\\end{document}
B
d
and
\\documentclass[12pt]{minimal}
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\\begin{document}$$B_s$$\\end{document}
B
s
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
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\\begin{document}$$\\textrm{Br}(B_d \\rightarrow \\textrm{invisible}) < 1.4\\times 10^{-4}$$\\end{document}
Br
(
B
d
→
invisible
)
<
1.4
×
10
-
4
and
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\\begin{document}$$\\textrm{Br}(B_s \\rightarrow \\textrm{invisible}) < 5.6\\times 10^{-4}$$\\end{document}
Br
(
B
s
→
invisible
)
<
5.6
×
10
-
4
, both at
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\\begin{document}$$90\\%$$\\end{document}
90
%
CL. The
\\documentclass[12pt]{minimal}
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\\begin{document}$$B_d$$\\end{document}
B
d
limit is only a factor of 6 looser than the world-leading one provided by the BaBar collaboration, while the
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\\begin{document}$$B_s$$\\end{document}
B
s
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
Letter in response to: “The importance of clinical importance when determining the target difference in sample size calculations”
The true power of a trial is determined by design inputs (randomization scheme, sample size) and decision criteria (analysis model, type I error rate, etc.) which are chosen by the trial designer, in combination with parameters whose values are unknown and beyond the control of the trial designer (population characteristics, including the true benefit of the intervention). [...]we perform calculations for a target power using assumed values for these unknown parameters—for simplicity in the discussion, suppose the only one unknown is the true benefit. [...]this is not the motivating purpose of a sample size calculation, but it is a condition that we must believe to be satisfied (approximately) for the sample size calculation to have any worth—if it does not hold, the calculation misleads us about the true power, so we should never accept calculations in which we doubt that the assumed benefit is realistic. [...]consider a scenario where the MID is 5 and lies within the range of realistic estimates for the true benefit, 3 to 10, say.
Journal Article