UK 8-12 Dec 2007 Alignment and Calibrations K. Goulianos1 Alignment and Calibrations Konstantin Goulianos The Rockefeller University Forward Physics.

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UK 8-12 Dec 2007 Alignment and Calibrations K. Goulianos1 Alignment and Calibrations Konstantin Goulianos The Rockefeller University Forward Physics at the LHC Manchester, UK, 8-12 Dec 2007

UK 8-12 Dec 2007 Alignment and Calibrations K. Goulianos2 The Forward Detectors of CDF

UK 8-12 Dec 2007 Alignment and Calibrations K. Goulianos3 The CDF

UK 8-12 Dec 2007 Alignment and Calibrations K. Goulianos4 MiniPlug Construction About 1500 wavelength shifting fibers of 1 mm dia. are ‘strung’ through holes drilled in 36x¼” lead plates sandwiched between reflective Al sheets and guided into bunches to be viewed individually by multi-channel photomultipliers.

UK 8-12 Dec 2007 Alignment and Calibrations K. Goulianos5 Measurements w / the MiniPlugs ADC counts in MiniPlug towers in a pbar-p event at 1960 GeV. “jet” indicates an energy cluster and may be just a hadron counts ~ 1 GeV Multiplicity of SD and ND events ENERGY MP TOWER STRUCTURE POSITION NIM A 430 (1999) NIM A 496 (2003) NIM A 518 (2004)

UK 8-12 Dec 2007 Alignment and Calibrations K. Goulianos6 RPS Tracking Calibration with RPS tracking 0.055< ξ RPS <0.060 slice

UK 8-12 Dec 2007 Alignment and Calibrations K. Goulianos7 Diffractive Dijet Signal Low InstLum ~0.5E data: ~1.5E31 BG  ND dijet + soft SD

UK 8-12 Dec 2007 Alignment and Calibrations K. Goulianos8 Dynamic Alignment of RPS Detectors Method: iteratively adjust the RPS X and Y offsets from the nominal beam axis until a maximum in the b-slope is t=0. Limiting factors 1-statistics 2-beam size 3-beam CDF W /lowlum data

UK 8-12 Dec 2007 Alignment and Calibrations K. Goulianos9 P L Balance  M W MWMW M W - data vs. expectation

UK 8-12 Dec 2007 Alignment and Calibrations K. Goulianos10 E T jet Calibration Calibrate E t jet or , as you wish!  use RPS information to check jet energy corrections 

UK 8-12 Dec 2007 Alignment and Calibrations K. Goulianos11 thank you