Charmonium Production at BaBar Jamie Boyd University of Bristol Photon 2003, Frascati 7 th -11 th April 2003 On behalf of the Collaboration.

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Presentation transcript:

Charmonium Production at BaBar Jamie Boyd University of Bristol Photon 2003, Frascati 7 th -11 th April 2003 On behalf of the Collaboration

2 April 10th, 2003 J. Boyd - Photon 2003 Overview BaBar detector & PEP-II performance  c measurements in 2 photon events – Measurement of the  c width – Observation of  c (2S) J/  production using ISR events –Measurement of the J/  total width Understanding J/  production in B decays as a test of non- relativistic QCD: –Branching fractions: B +  J/  p  and B 0  J/  p p Summary of new exclusive B decays to charmonium All of the above analyses represent new or newly updated results Preliminary Result!

3 April 10th, 2003 J. Boyd - Photon 2003 BaBar Detector Detector of Internally Reflected Cherenkov light 1.5T solenoid ElectroMagnetic Calorimeter Drift CHamber Instrumented Flux Return Silicon Vertex Tracker e + (3.1GeV) e - (9GeV) Measures energy of electrons and photons  (E)/E=1.33%E -1/4  2.1% Identifies particles by their Cherenkov radiation K-  separation>3.4  for P<3.5GeV/c Measures momentum of charged particles + dE/dx  (p T )/P T =0.13%P T  0.45% Identifies muons and neutral hadrons Measures origin of charged particle Trajectories + dE/dx 97% efficiency

4 April 10th, 2003 J. Boyd - Photon 2003 PEP-II Performance PEP-II has provided 100fb -1 to date exceeding design specifications Integrated Luminosity Daily luminosity

5 April 10th, 2003 J. Boyd - Photon 2003  c production in 2  events  c lowest lying charmonium state  c width poorly determined New Babar result using 1715 ± 70 signal events Use J/  ISR events as cross check of the detector resolution model Don’t detect the electrons +-

6 April 10th, 2003 J. Boyd - Photon 2003  c production in 2  events - Analysis strategy  c J/  Spectrum fitted with: J/  : Gaussian c:c: GaussianBreit-Wigner Bkg.: Exponential from MC Free parameters:

7 April 10th, 2003 J. Boyd - Photon 2003  c production in 2  events - Results  c width  c mass Dominant Syst errors: for M  c uncertainty on mass scale for   c uncertainty in background parameterization (0.7MeV/c 2 ) MeV/c 2

8 April 10th, 2003 J. Boyd - Photon 2003  c production in 2  events -  c (2S) BaBar preliminary results: Theory: Ebert et al., Phys. Rev. D62, (2000) Eichten, Quigg, Phys. Rev. D49,5845 (1994) Lahde, Riska, hep-ph/ Belle: ( in excl. B decays ): Crystal Ball: ( in  (2s) decays ) l

9 April 10th, 2003 J. Boyd - Photon 2003 J/  production in ISR events Study ISR e + e - ->   +  - events in the  +  - mass range around the J/  mass (2.8 – 3.2GeV/c 2 ) Fit to the J/  mass spectrum to measure J/  parameters ~10% of ISR events have a photon which falls in the detector acceptance High statistics due to large luminosity so fully reconstruct both muons and photon Event selection E  *>3GeV Muon ID E  (EMC) 0.5GeV/c Kinematic cuts |E total -E beams |<1.5GeV,  <0.07rad 1C Kinematic fit – mass of the recoil against the di-muon system constrained to be 0 (photon hypothesis)

10 April 10th, 2003 J. Boyd - Photon 2003 J/  production in ISR events – Method Measuring total cross section gives: Substituting in PDG values for B  and B ee allows measurement of  ee and  tot In ISR Probability that ISR photon has energy fraction x Integrating and adding in J/  lineshape:

11 April 10th, 2003 J. Boyd - Photon 2003 J/  production in ISR events - Method J/  lineshape (from simulation) convoluted with Gaussian (detector resolution) main fit parameter 2 nd order polynomial (from simulation) Fit the di-muon mass spectrum with: Obtain total cross section from R K corrects for FSR Processes = 1.11  0.01 (from simulation) Efficiency systematics cancel in this ratio

12 April 10th, 2003 J. Boyd - Photon 2003 J/  production in ISR events - Results ~70k selected events, ~8000 in peak Preliminary results: PDG: (Dominant systematic is error on K from FSR, and uncertainty on J/  lineshape) B A B AR Preliminary Background: < 0.1% in peak < 0.3% in NR region

13 April 10th, 2003 J. Boyd - Photon 2003 J/  production in ISR events - Interference Interference between J/  production and non-resonant component Effects the shape of the distribution but has very little effect on the total cross section Taken into account as a systematic error (0.3%) Line shape with/without interference convoluted with detector resolution

14 April 10th, 2003 J. Boyd - Photon 2003 J/  production in ISR events – the future… This is just the beginning for charmonium production in ISR at BaBar Also looking at J/ ,  (2S) production in hadron decays modes Eventual goal is to measure R HAD (s) using ISR at BaBar  (2S)->J/  +  - J/  ->  +  -  +  - +-+- B A B AR Preliminary

15 April 10th, 2003 J. Boyd - Photon 2003 B  J/  X experimental observation An excess at low momentum in the inclusive production of charmonium mesons in B decay at the  4S) has been observed compared to the non-relativistic QCD prediction (excess corresponds to a branching fraction ~10 -4 ) Possible source includes: intrinsic charm component of B production of sdg hybrid with J/  Rate enhanced due to B decay to J/  baryon-antibaryon Phys.Rev. D67, (2003) data NRQCD color singlet

16 April 10th, 2003 J. Boyd - Photon 2003 B +  J/  p  and B 0  J/  pp analysis Key elements of the analysis are the separation of low momentum protons from Kaons (DIRC, dE/dx) - 98 % efficiency, less than 1% misidentification B +  J/  p  pp l + l -,l= ,e B 0  J/  pp l + l -,l= ,e These processes can be enhanced by exotic QCD resonances in intermediate states e.g. (baryonium, pentaquark, nuclear-bound quarkonium)

17 April 10th, 2003 J. Boyd - Photon events in signal region with an expected background of 0.21  0.14 B +  J/  p  results B (B +  J/  p  )=(12 )x % CL upper limit 26x10 -6 Prob.(  4, expecting 0.21  0.14 ) is equal to 2.5x10 -4 (3.5  ) Bayesian analysis, uniform prior  0 gives: Efficiency uncertainty is dominant systematic Submitted to PRL hep-ex/

18 April 10th, 2003 J. Boyd - Photon 2003 B 0  J/  pp results Expected 0.64  0.17 background events, one observed. 90% CL upper limit 1.9x event in signal region

19 April 10th, 2003 J. Boyd - Photon 2003 This is not an explanation of the excess Measured branching fractions order of magnitude too low to explain excess Each of the possible QCD exotic resonances (baryonium, pentaquark, nuclear-bound quarkonium) that could be involved foresee a monoenergetic particle (J/ , p,  ) in the B frame No evidence for Exotic resonance production

20 April 10th, 2003 J. Boyd - Photon 2003 (1.6  0.6  0.4) x (4.6  0.7  0.6) x Summary of exclusive B decays to Charmonium Measured Branching fractions And Upper Limits at 90% CL (4.4  1.4  0.5) x (5.1  1.9  0.5) x < 9.2 x < 2.7 x < 6.3 x < 1.9 x (11.6 )x Phys.Rev.Lett. 90, (2003)

21 April 10th, 2003 J. Boyd - Photon 2003 Summary New measurement of the  c width –Agrees with large width measurements by Belle –Observation of the  c (2S) J/  production in ISR events –Preliminary measurement of the total J/  width –Preliminary measurement of the e + e - J/  width New Exclusive B decays to charmonium –J/  Baryon anti-Baryon processes cannot explain the excess of J/  production at low p* in B decays

22 April 10th, 2003 J. Boyd - Photon 2003 BACK UP SLIDES… What is Mes and DeltaE etaC event selection Systematics on ISR J/  widths J/  baryon anti-baryon event selection

23 April 10th, 2003 J. Boyd - Photon 2003 Exclusive B reconstruction variables The variables M ES and  E  E is the difference between the B candidate energy and the expected energy M ES is the B candidate mass with the beam energy used as the candidates energy Nearly uncorrelated Very useful for distinguishing signal from, background (continuum & B background)

24 April 10th, 2003 J. Boyd - Photon 2003  c production in 2  events – Event Selection Do not reconstruct the e + e - Select 2 photon events E tot (lab) <9GeV (suppresses B decays)  p T <0.5GeV/c Fully reconstruct the  C (K S K +  - ) Ks ->  +  <M(  +  -)<0.503 GeV/c 2 Cos  (Ks) > 0.99 Apply Particle Id on charged K candidate (dE/dX & DIRC) Fit the K S K +  - vertex (prob(  2)>0.01)

25 April 10th, 2003 J. Boyd - Photon 2003 J/  production in ISR events – Systematic Errors Summary of the systematic errors on the J/  parameters Statistical error on K factor 0.9% Systematic error on K factor 1.3% (Varying cut values) Background uncertainty 0.5% (MC / varying background cuts) Simulation of J/  lineshape 1.4% (fit with or without muon bremsstrahlung) Interference 0.3% (see slide 13) Total 2.2%

26 April 10th, 2003 J. Boyd - Photon 2003 B -> J/  Baryon anti-Baryon – Event Selection Reconstruct J/  -> e+e- or  +  <M ee <3.13 GeV/c 2 or 3.06<M  <3.13 GeV/c 2 Particle Id on the electron candidates (EMC, dE/dX, DIRC) and muon candidates (EMC, IFR) Particle Id on Proton candidates (dE/dX, DIRC) Lambda candidates reconstructed in  -> p+  - mode 1.10<M p  <1.13 GeV/c 2  vertex >2mm from J/  vertex Cut on difference between expected B energy and B candidate energy (  E) & Mes (B-mass with the beam energy used to improve the resolution) Efficiencies 4.9  0.9% (B + -> J/   p), 18.4  2.4% (B 0 -> J/  pp)