Future Physics at HERMES Random Thoughts on HERMES No, I’m not speaking for 90 minutes… A Little History The Recoil Epoch (I.e., stolen slides) Concluding Remarks (sermonette) Ed Kinney University of Colorado, Boulder, USA 1 July 2007 HEDT Symposium

The Recoil Detector Epoch Physics Focus on Exclusive Reactions and GPDs DVCS 1 July 2007 HEDT Symposium

First Observations of DVCS… 1 July 2007 HEDT Symposium

Factorization 1 July 2007 HEDT Symposium

Wigner Transforms (1932) 1 July 2007 HEDT Symposium

3D Pictures of the Proton!!! 1 July 2007 HEDT Symposium

Measuring DVCS with true exclusivity Recoil Detector Measuring DVCS with true exclusivity 1 July 2007 HEDT Symposium

Recoil Detector Overview 1 Tesla Superconducting Solenoid Photon Detector 3 layers of Tungsten/Scintillator PID for higher momentum detects Δ+pp0 Scintillating Fiber Detector 2 Barrels 2 Parallel- and 2 Stereo-Layers in each barrel 10° Stereo Angle Momentum reconstruction & PID Silicon Detector 16 double-sides sensors 10×10 cm2 active area each 2 layers Inside HERA vacuum momentum reconstruction & PID HERA BEAM Target Cell 1 July 2007 HEDT Symposium

HERMES Recoil Detector timeline From 1996 through 2005 HERMES ran with the polarized H/D target. November 2005 the ABS was removed. In January 2006 the recoil detector was installed. February started data taking. Scintillating fiber detector worked immediately. Silicon detector had serious beam induced noise. Target and silicon damaged in May 2006. Modified target installed July with repaired SI. Timing problem with Photon detector also fixed in July. Full detector operations since September 2006. Timing on silicon final. 1 July 2007 HEDT Symposium

First experience with the Recoil Silicon Detector Pedestal Stability ~1-2 channel shift expected caused by HERA. Observed typically 4. Surprise! 0.5% of the strips couple much stronger to the beam. Pedestal correction due to beam current now implemented. Fine tuning still necessary. High-Low gain ratio OK. Energy Calibration Offline calibration seems not valid. Use “punch-though” point as absolute gain. Use MIP particle for a strip by strip relative calibration. Crosstalk/clustering still under study 1 July 2007 HEDT Symposium

Recoil Detector Alignment Six parameters (three translations and three rotations) which are common for all tracks are fitted Each track is fitted with a straight line taking into account alignment parameters at current iteration After iterative procedure converges it is repeated with new initial values of alignment parameters to be sure that alignment procedure does not depend on initial approach Residuals and dependence of residuals on coordinates used as a tool to check alignment procedure 1 July 2007 HEDT Symposium

Residuals for the SFT from cosmic data Parallel top =0.28mm SFT Parallel Bottom =0.31mm 1mm fibers 1 July 2007 HEDT Symposium

Data Tracking Full tracking is in production including alignment. Efficiency of the tracking algorithm studied on MC and found to be 98.4 %. Starting to study the efficiencies residuals and ghost tracks. 1 July 2007 HEDT Symposium

Running 7.4M DIS e- 2006 20M DIS e+ 2006 13M e+ 2007 maybe 20M in July 47M DIS for the unpol. Run 1M DIS ~24pb-1 ~ 1 fb-1 proposed for our recoil detector running. Not e+ e- balanced due to the initial startup problems. 10 M DIS on deuterium in addition. 1 July 2007 HEDT Symposium

Many Challenges ahead!!! Finish “Pre-Recoil” Analyses and publish! Complete the analysis commissioning of the recoil and release the first physics results!! Publish, publish, publish!!! Get your degree!!! Publish, publish, publish!!! Get your degree!!! 1 July 2007 HEDT Symposium

1 July 2007 HEDT Symposium

1 July 2007 HEDT Symposium

We must get the most from our data while the bells are still ringing!!! 1 July 2007 HEDT Symposium

To help you make great measurements!!! Why am I here? To help you make great measurements!!! Take care of paperwork :( Maintain Research Support Keep the Collaboration Involved! 1 July 2007 HEDT Symposium

A HERMES Constant Thanks to Sabine!!! 1 July 2007 HEDT Symposium

Critical Component of HERMES Success 1 July 2007 HEDT Symposium

The HERMES Research Trifecta Working on exciting physics Working with brilliant colleagues Working with colleagues who became dear friends Thanks to everyone for the experience of a lifetime! 1 July 2007 HEDT Symposium