Photon 2003Falk Meissner, LBNL Falk Meissner Lawrence Berkeley National Laboratory For the STAR Collaboration Photon 2003 April 2003 Coherent Electromagnetic.

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Presentation transcript:

Photon 2003Falk Meissner, LBNL Falk Meissner Lawrence Berkeley National Laboratory For the STAR Collaboration Photon 2003 April 2003 Coherent Electromagnetic Interactions in Ultra-Peripheral Heavy Ion Collisions Ultra Peripheral Collisions Exclusive Meson Production Data Sets and Analysis Cross Sections Photon-Photon Interactions Summary

Photon 2003Falk Meissner, LBNL ST A R Heavy Ion Collision RHIC (Au Au, 200GeV/nucleon, University of Frankfurt)

Photon 2003Falk Meissner, LBNL Ultra-Peripheral Collisions Au X  P Nuclei ‘miss’ geometrically and interact via long range fields Coupling strength Coupling strength  large cross sections Photon-   Z 2 Equivalent Photon Approximation (Weizsaecker-Williams, Fermi) Pomeron- P  A 4/3 (surface) to A 2 (volume) Coherent coupling to extended charge of both nuclei    P > R_A  Small transverse momentum: p T < h/2R A ~ 90 MeV Longitudinal component P L <  h/2R A ~ 6 GeV Quasi Real Photons

Photon 2003Falk Meissner, LBNL Exclusive Vector Meson Production  A ’ VA Extrapolate  p ’ Vp to  A ’ VA with Glauber calculation  Large cross sections: 350 mb at s NN 1/2 =130 GeV 590 mb at s NN 1/2 =200 GeV S.Klein, J.Nystrand, Phys. Rev C (1999), A. Baltz, S. Klein,J. Nystrand PRL 89, (2002) Factorize as function of impact parameter Nuclear breakup by single (1n1n) and multiple (xnxn )neutron emission single/multiple neutron emission selects different impact parameters Exclusive  production AuAu  AuAu  0 … with nuclear excitation AuAu  Au*Au*  0

Photon 2003Falk Meissner, LBNL Experimental Signature of UPC Two oppositely charged tracks with vertex Low total p T Back-to-back in transverse plane ZDC CTB-Topology Challenge: Trigger ! Topology requirements in central trigger barrel (CTB) Coincident signals from nucl. Breakup in zero degree calorimeters (ZDC)

Photon 2003Falk Meissner, LBNL Transverse Momentum & Invariant Mass Spectra 2000: 130 GeV; 9hrs dedicated, 30k triggers 2001: 200 GeV; trigger mix 1.5M topology triggers Peak at low p T  coherent interaction Background model from like-sign pairs normalized to data No neutron signal in ZDC  gold nuclei remain in ground state Signal region: p T <0.15 GeV Topology Trigger AuAu  AuAu  0 200GeV Preliminary

Photon 2003Falk Meissner, LBNL Meson Production with Nuclear Break-up Minimum Bias (ZDC) Trigger AuAu  Au*Au*  0 ZDC Response Signal region: p T <0.15 GeV 2000: ~400k triggers L~60/mb 2001: ~1.7M triggers L~250/ mb Amplitude ratio  /r similar to lepton nucleon scattering 200GeV Preliminary

Photon 2003Falk Meissner, LBNL Cross Section  (AuAu  Au (*) Au (*)  ) 130 GeV – PRL89, (2002), 200 GeV Preliminary Luminosity normalization from 7.2b hadronic AuAu cross section Systematic uncertainties ~20% Theory: A. Baltz, S. Klein J. Nystrand Preliminary Total No Breakup xn,xn 1n,1n

Photon 2003Falk Meissner, LBNL t-Spectrum Determination of Gold Radius

Photon 2003Falk Meissner, LBNL Coherent Interactions in Deuterium-Gold 2003 dAu->  dAu Golden photon torch on d Trigger on the breakup of the deuterium (ZDC) Level0 trigger purity 10% !! 0.9M events First results: clear signal (5 minute testrun) data is in production

Photon 2003Falk Meissner, LBNL Two-Photon Interaction Two-Photon Interaction AuAu  Au*Au*e + e - Physics Topics:  Validity of WWA and factorization  Strong field QED Z  ~ 0.6  Large cross section  Z 4  4 Au   e-e- e+e+ 200GeV, 0.25T Magnetic Field Acceptance corrected pair p T Coherent e + e - Pairs p T ~40fm) Identified e+e - via dE/dx only at low momentum p<0.13 GeV Small acceptance (~10 -6 ) for e + e - pairs cross section is peaked in the forward region and at low (non-reconstruct able) invariant mass Manetic field cuts of very low momentum tracks (<60MeV) where cross section is large

Photon 2003Falk Meissner, LBNL * Normalized to total hadronic cross- section, 10% systematic error Cross-section Within acceptance 0.14<M ee <0.26 GeV, |  |<1.15 Total 4  cross section 33kB! STAR PRELIMINARY Predictions LO QED S.Klein V.Morozov W Phd. Thesis V. Morozov

Photon 2003Falk Meissner, LBNL Summary First measurements for coherent meson production in ultra-peripheral heavy ion collisions with and without nuclear excitationFirst measurements for coherent meson production in ultra-peripheral heavy ion collisions with and without nuclear excitation Au + Au -> Au + Au +   and Au + Au -> Au * + Au * +  . low p T = coherent coupling Cross Sections agree with predictions =>Approximate factorization of rho-production and nuclear excitation =>Weizsaecker-Williams photon flux from large relativistic charges ok. => Glauber extrapolation of  N to  Au ok Cross section for electron-pair production reproduced by LO calculations This is just the beginning; Future analysis topics: –Vector meson spectroscopy,excited states (  *,…) –Multiple VM production –Hard diffraction - higher mass states J/  –Interference of decaying particles RHIC is a good place to study diffractive and electromagnetic processes in heavy ion collisions. Lots of data and physics topics.