Heavy Hadron Hadron Spectroscopy Spectroscopy and and Heavy - PowerPoint PPT Presentation

Heavy Hadron Hadron Spectroscopy Spectroscopy and and Heavy Production at Tevatron Tevatron Production at Igor V. Gorelov University of New Mexico, USA On behalf of CDF and D ∅ Collaborations XIV International Conference on Hadron Spectroscopy HADRON 2011 13
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Outline Outline Results from Tevatron CDF D ∅ D CDF ∅ • Experimental Apparatus • Heavy Baryons (CDF) Bottom Baryon Resonances • Charm Baryon Resonances • Comparison of Exp. Results • • Y(4140) (CDF) • Measurement of Production Fraction 0 ) × BR( Λ b 0 → J⁄ ΨΛ 0 ) (DØ) f(b →Λ b • Summary • • p and p and  p beams p beams • • 36 36 × × 396 ns bunches of 980 396 ns bunches of 980 GeV GeV • collision points: CDF and collision points: CDF and DØ DØ • • E E c = 1960 GeV GeV • .m.s. = 1960 c.m.s. 2 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

CDF II Detector CDF II Detector Central µ Central µ -tracking -tracking • Tevatron delivered CSX CSX ∫ Ldt > 11 fb -1 BMU BMU • And processed total p  p luminosity (CDF): • Recorded ∫ Ldt ≅ 9.5 fb -1 • Presented analyses p p based: up to ∫ Ldt ≅ 6.0 fb -1 Solenoid Solenoid SVX II SVX II PEM/PHA PEM/PHA TOF TOF COT COT WHA WHA CEM/CHA CEM/CHA Multipurpose detector: • VX tracking • Central tracking • µ -tracking ID • EM/HA calorimeters • multi-tiered triggers • di-muon ( J / Ψ→ µ + µ − ) • Displaced Two Track Trigger 3 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

DØ Triggers and Data (III) Triggers and Data (III) DØ • Trigger on Di- muons ( µ + µ − ) . • J / Ψ→ µ + µ − mode is triggered • Level 1: hardware to form roads defined by hits in two layers of the muon scintillator system. • Level 2: uses digital signal processors to form track stubs defined by hits in the muon drift-chamber and muon scintillator systems. • Level 3: full reconstruction • The suite of the single muon ( µ ± ) triggers. • with the option to trigger on a displaced muon tracks 4 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Baryons: Resonance Properties (I) Resonance Properties (I) b Baryons: Σ b Σ 5 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Baryons: Resonance Properties (I) Resonance Properties (I) b Baryons: Σ b Σ 6 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Baryons: Resonance Properties (II) Resonance Properties (II) b Baryons: Σ b Σ CDF Run II Preliminary L = 6 fb -1 -1 CDF Run II Preliminary L = 6 fb 7 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Baryons: Resonance Properties (III) Resonance Properties (III) b Baryons: Σ b Σ 8 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Baryons: Resonance Properties (V) Resonance Properties (V) b Baryons: Σ b Σ -1 CDF Run II Preliminary L = 6 fb -1 CDF Run II Preliminary L = 6 fb The projection The projection of the of the unbinned unbinned LH fit LH fit onto onto the binned the binned Q- distribution of Q- distribution of Σ ( ∗ ) − − candidates. candidates. ( ∗ ) Σ b b 9 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Baryons: Resonance Properties (VI) Resonance Properties (VI) b Baryons: Σ b Σ -1 CDF Run II Preliminary L = 6 fb -1 CDF Run II Preliminary L = 6 fb The projection The projection of the of the unbinned unbinned LH fit LH fit onto onto the binned the binned Q- distribution of Q- distribution of Σ ( ∗ ) + + candidates. candidates. ( ∗ ) Σ b b 10 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Baryons: Resonance Properties (VII) Resonance Properties (VII) b Baryons: Σ b Σ -1 CDF Run II Preliminary L = 6 fb -1 CDF Run II Preliminary L = 6 fb CDF Run II Preliminary L = 6 fb -1 -1 CDF Run II Preliminary L = 6 fb 11 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Baryons: Resonance Properties (VIII) Resonance Properties (VIII) b Baryons: Σ b Σ Systematic Uncertainties Systematic Uncertainties 12 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Baryons: Resonance Properties (IX) Resonance Properties (IX) b Baryons: Σ b Σ Systematic Uncertainties: Signal Resolution Systematic Uncertainties: Signal Resolution CDF Run II Preliminary CDF Run II Preliminary CDF Run II Preliminary CDF Run II Preliminary Fitted Fitted Gaussian Gaussian σ σ of of D D ∗ + ∗ + - - : : various data various data Conservative 25% Conservative 25% ( 1.25 ( 1.25 ×σ ×σ (MC) ) is (MC) ) is taking periods w.r.t. Monte Carlo predictions. taking periods w.r.t. Monte Carlo predictions. included into systematic uncertainties included into systematic uncertainties 13 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Bottom Baryons: Σ Resonances (XI) Bottom Baryons: b Resonances (XI) Σ b Summary of the Final Results Summary of the Final Results 14 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Bottom Baryons: Σ Resonances (XII) Bottom Baryons: b Resonances (XII) Σ b Summary of the Final Results Summary of the Final Results 15 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Charm Sector: Baryon Resonances Charm Sector: Baryon Resonances , Σ and Λ (I) (I) , and ∗ ∗ c ∗ c ∗ Σ c Σ c Λ c Σ arXiv:1105.5995 [hep-ex]. c Submitted to PRD. See plenary talk made by Thomas Kuhr yesterday 16 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Charm Sector: Baryon Resonances Charm Sector: Baryon Resonances , Σ Fits , Fits ∗ c ∗ Σ c Σ c Σ c 17 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Charm Sector: Baryon Resonances Charm Sector: Baryon Resonances , Σ and Λ (II) (II) , and ∗ ∗ c ∗ c ∗ Σ c Σ c Λ c Σ c (2625) + + The appropriate treatment of the Λ The appropriate treatment of the c (2625) Λ c contribution into the Σ (2520) threshold contribution into the c (2520) threshold Σ c area results in mass values moved apart mass values moved apart area results in from the CLEO (2005) data points. from the CLEO (2005) data points. 18 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Isospin (I =1) (I =1) Mass Splitting: Mass Splitting: Σ vs Σ Isospin c vs Σ c Σ b b 19 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Spectroscopy of Exotic States: Spectroscopy of Exotic States: Y(4140) (I) (I) Y(4140) Motivation: Renewed interest in a charmonium spectroscopy since few states with seemingly exotic quantum numbers have been observed, to be specific • Discovery X(3872) → VV • Observation Y(3940) → J⁄ Ψ ω (VV) • Belle, PRL 94, 182002 (2005) • Belle, PRL 101, 082001 (2008) • e + e − → γ ISR Y(4260), Y(4260) → J⁄ Ψ π + π - • BABAR, PRL 95, 142001 (2005) • (0, 1, 2) − + triplet predicted by theory • Y → J⁄ Ψ ϕ could be a candidate. • CDF has undertaken the search of the exotic states within a B-meson decay mode • B + →Κ →Κ + J⁄ Ψ ϕ • evidence of near threshold bump at m(J⁄ Ψ ϕ ) ~4140 MeV, • with ∫ dt dt ⋅ L = = 2.7 fb 2.7 fb -1 -1 , , PRL 102, 242002 (2009) ∫ ⋅ L 20 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Spectroscopy of Exotic States: Spectroscopy of Exotic States: Y(4140) (II) (II) Y(4140) • Near Threshold Structure Analysis Criteria identified as a mass within B + • B + → Y K + , Y → J⁄ Ψ ϕ • J⁄ Ψ → µ + µ − , i.e. J / Ψ di- µ triggered sample • ϕ →Κ + Κ − • exclusively reconstructed B- meson • B + → J⁄ Ψ ϕ K + Picture courtesy of Dr. J.-P. Fernandez (CIEMAT) • additional mass constraint reduces the background • search for a signature in m(J⁄ Ψ ϕ ) 21 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron

Spectroscopy of Exotic States: Spectroscopy of Exotic States: Y(4140) with with ∫ dt dt ⋅ L = 6 fb -1 -1 (III) (III) Y(4140) ∫ ⋅ L = 6 fb • The analysis criteria and cuts have been frozen 2.7 fb -1 -1 to PRL pub. , based on 2.7 fb • Changes w.r.t. the PRL published analysis • background model changed 115 ± 12 cand . • from: PhaseSpace(3-body) + flat (combinat.) • to: PhaseSpace(3-body) only. • any tests done with more data and/or loosening cuts has shown no deviation from PhaseSpace model, what has justified our choice. Reconstruct the mass difference: Δ M = M( µ + µ − K − K + ) − M ( µ + µ − ) • The signal model: • (S-wave Rel. B-W) ⊗ Gaussian ( σ = 1.7MeV/c 2 ) M( J⁄ Ψ ϕ K+) fit: • the ( µ + µ − K − K + ) taken from B-signal ±3 σ area • Gaussian ( σ = 5.9 MeV/c2) + Poly. (1st ) • 115 ± 12 (stat) candidates . • the spectrum is blinded • opened only when stat. MC trials show >75% chances to observe 5 σ signal 22 17 June 2011 17 June 2011 Igor Gorelov, HQ at Tevatron