# Mark's Sandbox

TOF electronics chain

• $\gamma p\rightarrow X(2000)p$
• $X(2000)\rightarrow b_{1}^{+}\pi ^{-}$
• $b_{1}^{+}\rightarrow \omega \pi ^{+}$
• $\omega \rightarrow \pi ^{+}\pi ^{-}\pi ^{0}$
• $\pi ^{0}\rightarrow \gamma \gamma$
• $\gamma p\rightarrow \omega p$
• $\gamma \gamma \ {{\rm {mass}}}$
• $\pi ^{+}\pi ^{-}\pi ^{0}\ {{\rm {mass}}}$

$\alpha \beta \gamma \delta \epsilon \eta$

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Suggested coordinate system for linear detector elements in a plane perpendicular to z.

Assume line direction is chosen to go in the positive $y$ direction. If the line is parallel to the x-axis, choose the positive direction to be the positive x direction. Then angle of inclination of the line is an angle $\phi$, 0 <= phi < 180. Unit vector along the line is lhat = xhat cos phi + yhat sin phi, the unit vector normal to the line (in the detector plane) is nhat = -xhat sin phi + yhat cos phi. In this way, lhat and nhat satisfy the right hand rule, i. e., lhat cross nhat = zhat.

• here are some new bullets
• as a test

here is an edit