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BaBar homepage  EMC : PHOTON STUDIES

An examination by David Hopkins of the energy resolution of the calorimeter as a photon detector using μ+ μ- γ events.

  Talks

Talks to EMC group at Wednesday meetings on:

Neutrals meeting talks:

Collaboration meeting talks:

Talk given at EMC workshop (December '04) (pdf)

A basic overview given at the RAL Summer School, September 2004 (pdf)

  Plots

Plots showing FWHMs and peak positions:

Plots showing fits from minimizing χ2 using method outlined in talk of 22nd June '05:

(Key: MC E&gammameas/E&gammatrue, MC/data E&gammameas/E&gammafit, function from minimizing χ2).

Plots showing E&gammameas/E&gammafit, with crystal ball fits used to derive values in the parameter plots above:

Plots showing E&gammameas/E&gammatrue, with associated crystal ball fit (ps).

Plots of response matrices used in unfolding method (ps).

Plots of E&gammafit/E&gammatrue (ps).


Some old plots comparing photon energy response:

(Key: Data E&gammameas/E&gammafit, MC E&gammameas/E&gammafit, MC E&gammameas/E&gammatrue.)

Note that the above plots were all produced using a cut on the photon's C of M energy at 3.0 GeV.

  ROOT files

ROOT files containing E&gammameas/E&gammafit distributions and unfolded resolution functions for MC and data.

ROOT files containing (amongst other things) response matrices and E&gammafit/E&gammatrue for MC and data. Note that these latter two files were produced for use in my own macros, and as such I have stored a number of 1D histograms as part of a 2D histogram, which can be projected out using the function ProjectionX(). Contact me with any questions about using these.

Text files with output of the mean and fwhm values from this study: MC and data.

  References

Useful note by Glen Cowan on unfolding the energy resolution (ps)


Questions or comments?   E-mail: dhopkins@slac.stanford.edu

Last updated: (