Nullwen, the Upper-Limit Herald Mug
An upper limit is a result: the Feldman–Cousins unified approach gives confidence intervals that move smoothly from upper limits to two-sided intervals.
The joke: The null result can be published precisely because the limit is quantified. The slogan on the mug reads NOTHING FOUND. 90% CONFIDENT.
Source: G. J. Feldman & R. D. Cousins, Phys. Rev. D 57, 3873 (1998).
Shipping calculated at checkout by destinationMade to order, ships in ~10 days
Details
Size & material11oz · 15oz
Black glossy ceramic mug with a C-handle. Lead- and BPA-free.
- 11oz: 0.33 l
- 15oz: 0.44 l
CareDishwasher & microwave safe
Dishwasher safe (top rack) or hand wash. Microwave safe.
ShippingBy destination
Shipping calculated at checkout by destination.
Made to order: about 10 days of production and handling before it ships.
Returns & replacements21 days
Every item is printed to order, so we can’t accept returns or exchanges for change of mind, or if you ordered the wrong size or colour.
Print defect, misprint, damage or the wrong item? We’ll send a free replacement, or a refund if you prefer. Report it within 21 days of delivery with a photo; no need to send it back.
The physics
Equations
| Symbol | Meaning | Unit |
|---|---|---|
| \(R\) | likelihood-ratio ordering variable | — |
| \(n\) | observed number of events | — |
| \(\mu\) | signal mean | — |
| \(\mu_{\text{best}}\) | physically allowed μ that maximises P(n | \(\mathrm{μ)}\) |
| \(b\) | known mean background | — |
Field notes
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