Hot Topic from Belle : Recent results on quarkonia

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Presentation transcript:

Hot Topic from Belle : Recent results on quarkonia Jolanta Brodzicka (Kraków) on behalf of Belle BEACH 2010 June 2010, Perugia Outline Puzzling nature of X(3872) X(3872), χc2→J/ψγ X(3872)→ψ’γ Summary Preliminary

Jolanta Brodzicka "News on quarkonia" Discovery of X(3872) PRL91, 262001 (2003) X(3872)→J/ψπ+π- observed in B→X(3872)K by Belle Confirmed by BaBar in B decays, CDF, DØ in pp→X(3872)+anything M(J/ψπ+π-) 152M BB S=367 (10) M(J/ψπ+π-)-M(J/ψ) 117M BB M(J/ψπ+π-) PRD71, 071103 (2005) Jolanta Brodzicka "News on quarkonia"

Jolanta Brodzicka "News on quarkonia" Try to understand X(3872) M(J/ψπ+π-) 2.4 fb-1 PRL103, 152001 (2009) B→X(3872)K 657M BB M(J/ψπ+π-) arXiv:0809.1224 Mass suggests D0D*0 bound state interpretation Molecular (below threshold) or virtual (above threshold)? Line-shape crucial to distuinguish Bound state scenario supported by: If X(3872) is conventional cc, why so narrow? PRD81, 031103 (2010) 657M BB D*→Dγ D*→D0π0 M(D0D*0) Jolanta Brodzicka "News on quarkonia"

Jolanta Brodzicka "News on quarkonia" Try to understand X(3872) PRL98, 132002 (2007) CDF angular analysis: JPC= 1++, 2-+ favored Difficult to discriminate further Belle evidence of X(3872)→J/ψπ+π-π0  Large isospin violation. Unlikely for usual cc Babar confirmation of X(3872)→J/ψω Decay in P-wave favoured→ JP=2- preferred Is X(3872) a missing ηc2(2D) charmonium? 0++ 1++ 1-- 2-+ arXiv:0505037 M(π+π-π0)  ω(782)-like 0.78 fb-1 arXiv:1005.5190 Jolanta Brodzicka "News on quarkonia"

Radiative decays of X(3872) Radiative transistions of charmonia: well predicted by quark models Good way to probe charmonium interpretation of X(3872) arXiv:0408116 M(γχc1) M(γχc2) X(3872)→γχc1 X(3872)→γχc2 ψ2 BR(X→γχc1) too small ψ3 BR(X→γχc2) too small hc’ ruled out by angular analysis ηc2 BR(X→J/ψππ) too large ηc’’ X(3872) too light and narrow χc1’ BR(X→γJ/ψ) too small No good charmonium candidate arXiv:0407033 Jolanta Brodzicka "News on quarkonia"

Radiative decays - first evidence X(3872)→γJ/ψ M(γJ/) 3.6σ 424fb–1 3.5σ M(γ’) M(γJ/) X(3872)→γJ/ψ X(3872)→γψ’ PRL102, 132001 (2009) Important implications: Imply even C-parity of X(3872) Shed light on X(3872) nature arXiv:0505037 Jolanta Brodzicka "News on quarkonia"

Radiative decays- problematic interpretation is problematic for molecular interpretation of X(3872) Components of molecule: DD* (+ J/ψρ + J/ψω) Decay: vector-meson dominance and light-quark annihilation Such decay pattern implies: Solution: admixture of charmonium component (for example χc1(2P)) Decrease X(3872) →γJ/ψ rate through destructive interference Radiative decays worth studying further PRD80, 074004 (2009) arXiv:0909.0380 Jolanta Brodzicka "News on quarkonia"

Radiative decays of quarkonia in B mesons Studied decay chain  with data sample of 772M BB Method: Reconstruct B mesons: signal window cut on ΔE-Mbc plane Constrain ΔE→0  Scale Eγ to improve resolution of M(J/ψγ) Study M(J/ψγ) Signal MC region of B signal For signal ΔE = 0 Tail due to radiative losses Jolanta Brodzicka "News on quarkonia"

Jolanta Brodzicka "News on quarkonia" Study of B→J/ψγ K χc region: χc1 serves as a reference mode χc2 suppressed by factorization Background sources: B→J/ψK*, B→ψ’K with ψ’→χc1γ non-J/ψ events, other combinatorial Background suppression: Eγ>290MeV for χc Eγ>470MeV for X(3872) π0 veto, cut on photon helicity angle background reduced by 80%, signal by 30% M(J/ψγ) fit to data: background: 1st order Chebyshev polynomial, signal: double Gaussian fit mass and resolution of χc1, fix mass and resolution of X(3872) and χc2 wrt to them M(J/ψγ) Background components: ■ B+→ψ’K+ ■ B0→J/ψK*0 from MC ■ B+→J/ψK*+ ■ B→J/ψK(1270), J/ψK2(1430) ■ non-J/ψ from data outside of J/ψ signal ■ other combinatorial from MC Jolanta Brodzicka "News on quarkonia"

Results for χc1,c2→J/ψγ with 772×106 BB B+→χc1,c2K+ B0→χc1,c2Ks0 M(J/ψγ) First evidence Significance includes systematics Jolanta Brodzicka "News on quarkonia"

Results for X(3872)→J/ψγ with 772×106 BB B+→X(3872)K+ B0→X(3872)Ks0 Significance includes systematic error Using Belle X→J/ψππ result from arXiv:0809.1224 Ratio consistent with previous Belle measurement Jolanta Brodzicka "News on quarkonia"

Jolanta Brodzicka "News on quarkonia" Study of B→ψ’γ K Studied decay: using 772M BB data Background sources: B →ψ’K*, B →ψ’K, B→ψ’Kππ non-ψ’ component and non-J/ψ for ψ’→J/ψππ Low energy photons: cuts used in B→J/ψγK inefficient ψ’K*-veto to reduce background from B→ψ’K* B→ψ’γK candidate + additional π±,0 → form ψ’K* and calculate: Reject „good” B→ψ’K* candidates with: → background reduced by 40% signal reduced by 15% Jolanta Brodzicka "News on quarkonia"

Jolanta Brodzicka "News on quarkonia" Background in M(ψ’γ) Background after selection cuts: Background matches data outside of X(3872) region → MC agree with data Parameterization of background components: ■■■ B→ψ’K*, ψ’K: using B→ψ’K*,ψ’K MC ■ non-ψ: using data outside of ψ signal region shapes fixed in fit to data ■ other combinatorial: using inclusive B→ψ’+all MC ψ’→J/ψπ+π- ψ’→e+e-,μ+μ- M(ψ’γ) blinded Background components: ■ B0→ψ’K*0 ■ B+→ψ’K*+ from MC ■ B+→ψ’K+ ■ B0→ψ’Ks0 ■ non-ψ’, non-J/ψ from data ■ other combinatorial from MC • data with X(3872) region blinded Jolanta Brodzicka "News on quarkonia"

Fit to M(ψ’γ): parameterization and validation Pseudo-experiment test: fully simulated MC with embedded X(3872)→ψ’γ signal Example of B+→XK+ , X→ψ’γ test: (assuming BaBar’s BR) ψ’→e+e-,μ+μ- M(ψ’γ) Signal PDF ψ’K*+ψ’K background PDF combinatorial (with non-ψ) Simultaneous fit to both ψ’ decay modes Signal: double Gaussian X(3872) mass fixed wrt fitted χc1→J/ψγ mass σX(3872) fixed wrt fitted σχc1 Background: shapes fixed from MC/data Fit successfully tested with 50 pseudo- experiments and Toy MC samples Expected X(3872)→ψ’γ signals assuming BaBar’s BR: ~58 events in B+→X(3872)K+ ~18 events in B0→X(3872)Ks0 MC ψ’→J/ψπ+π- M(ψ’γ) Signal PDF ψ’K*+ψ’K background PDF combinatorial (with non-ψ) MC Jolanta Brodzicka "News on quarkonia"

Results for X(3872)→ψ’γ with 772×106 BB Fit components: Signal ψ’K*+ψ’K background combinatorial (with non-ψ) B+→ψ’γK+ B0→ψ’γKs0 ψ’→e+e-,μ+μ- ψ’→J/ψπ+π- M(ψ’γ) No signal observed ψ’→e+e-,μ+μ- ψ’→J/ψπ+π- M(ψ’γ) Jolanta Brodzicka "News on quarkonia"

Jolanta Brodzicka "News on quarkonia" Summary Mode Signal Product BR Belle BaBar B→χc2K χc2→J/ψγ [10-5] B+ 32.8+10.9-10.2 1.11+0.36-0.34 ±0.09 <1.8 B0 2.8+4.7-3.9 <1.5 @90%CL <2.8 B→X(3872)K X(3872)→J/ψγ [10-6] 30.0+8.2-7.4 1.78+0.48-0.44 ±0.12 2.8±0.8±0.1 5.7+3.5-2.8 <2.4 @90%CL <4.9 B→X(3872)K X(3872)→ψ’γ [10-6] 5.0+11.9-11.0 <3.3 @90%CL 9.5±2.7±0.6 1.5+4.8-3.9 <6.6 @90%CL <19.0 X(3872)→J/ψγ clearly observed Most precise measurement, agrees with previous evidence No X(3872)→ψ’γ signal observed Disagree with Babar’s evidence Pure molecular interpretation of X(3872) is back? Big effort to understand nature of X(3872). Getting there? Jolanta Brodzicka "News on quarkonia"

Jolanta Brodzicka "News on quarkonia" Backup Jolanta Brodzicka "News on quarkonia"

Systematic errors in M(J/ψγ) Jolanta Brodzicka "News on quarkonia"

Systematic errors in M(ψ’γ) Jolanta Brodzicka "News on quarkonia"

Belle/BaBar comparison Jolanta Brodzicka "News on quarkonia"

Jolanta Brodzicka "News on quarkonia" Comparison Jolanta Brodzicka "News on quarkonia"

Jolanta Brodzicka "News on quarkonia" Background in M(J/ψγ) Background in M(J/ψγ) from scaled MC compared with background in data M(J/ψγ) data sideband: red non-J/ψ from M(l+l-) data sidebands: sky blue J/ψ inclusive + non-J/ψ from MC: dark blue M(J/ψγ) M(J/ψγ) Jolanta Brodzicka "News on quarkonia"

Jolanta Brodzicka "News on quarkonia" Fits to M(J/ψγ) Jolanta Brodzicka "News on quarkonia"

Jolanta Brodzicka "News on quarkonia" Backup X(3872)→J/ψγ ΔE→0 scaling for χc1 background subtraction Jolanta Brodzicka "News on quarkonia"

Fit to M(J/ψγ): parametrization χc region X(3872) region Fits checked with Toy MC: no bias found Signal: double Gaussian Background: 2nd order Chebyshev polynomial Fit accounts for possible data/MC difference in resolution, mass scale Signal: double Gaussian Background: 1st order Chebyshev polynomial Mean X(3872) fixed wrt fitted Mean χc1 using PDG mass difference of χc1 and X(3872) σX(3872) fixed using fitted σχc1 after taking difference in resolutions from MC Jolanta Brodzicka "News on quarkonia"

Jolanta Brodzicka "News on quarkonia" X(3872)→J/ψππ Jolanta Brodzicka "News on quarkonia"

Jolanta Brodzicka "News on quarkonia" x(3872)→D0D*0 Jolanta Brodzicka "News on quarkonia"