Exotic meson spectroscopy at LHCb M. Kreps Physics Department - PowerPoint PPT Presentation

Exotic meson spectroscopy at LHCb M. Kreps Physics Department www2.warwick.ac.uk

Introduction �� In the quark model we think of hadrons as qq or qqq �� But there is nothing preventing other combinations �� → Where are all those combinations with more than 3 quarks or anti-quarks? Michal Kreps – Exotic meson spectroscopy at LHCb 2 28 October 2014

Introduction - molecules �� There are lot of objects composed of baryons �� Michal Kreps – Exotic meson spectroscopy at LHCb 3 28 October 2014

Introduction - molecules �� There are lot of objects composed of baryons �� Where are similar objects from mesons? �� Michal Kreps – Exotic meson spectroscopy at LHCb 3 28 October 2014

Scalar mesons NOTE ON SCALAR MESONS BELOW 2 GEV Revised September 2013 by C. Amsler (Univ of Bern), S. Ei- delman (Budker Institute of Nuclear Physics, Novosibirsk), T. Gutsche (University of T¨ ubingen), C. Hanhart (Forschungszen- trum J¨ ulich), S. Spanier (University of Tennessee), and N.A. T¨ ornqvist (University of Helsinki). From RPP by PDG V. Interpretation of the scalars below 1 GeV: In the literature, many suggestions are discussed, such as conventional q ¯ q mesons, q ¯ qq ¯ q or meson-meson bound states. In addition one expects a scalar glueball in this mass range. In reality, there can be superpositions of these components, and one often depends on models to determine the dominant one. Although we have seen progress in recent years, this question remains open. Here, we mention some of the present conclusions. The f 0 (980) and a 0 (980) are often interpreted as multiquark states [140–144] or K ¯ K bound states [145]. The insight into �� Candidates beyond qq mesons exist, but real trouble is how to �� decide whether they are qq or something else Michal Kreps – Exotic meson spectroscopy at LHCb 4 28 October 2014

Charmonium �� Back in 2003, many expected �� arXiv:1403.1254 �� states still missing �� Belle started to search for them �� and quickly found one �� Did not fit into expected spectra �� Mass close to m ( D 0 ) + m ( D ∗ 0 ) �� 300 PRL 91, 262001 Events/0.010 GeV 200 100 0 0.40 0.80 1.20 M( π + π - l + l - ) - M(l + l - ) (GeV) Michal Kreps – Exotic meson spectroscopy at LHCb 5 28 October 2014

X ( 3872 ) properties Number of candidates / (2.5 MeV) CDF Run II ψ (2S) X(3872) 6000 70 1200 1200 ± ψ 20285 228 (2S) 2 -1 ≈ entries / 2.5 MeV/c 60 L 780pb 1000 5000 1000 50 800 40 4000 800 600 30 400 3000 600 20 200 ± 10 2292 113 X(3872) 2000 400 0 0 550 600 750 800 LHCb 1000 200 0 0 3.65 3.7 3.75 3.8 3.85 3.9 3.95 4 600 800 1000 1200 1400 π π ψ ψ 2 ψ π π + - M( J/ ) - M(J/ ) [MeV] + - m(J/ ) [ GeV/c ] PRL 110, 222001 7 ≈ -1 10 CDF Run II Preliminary L 780pb Number of experiments / bin LHCb X(3872) yield / unit volume 500 θ θ |cos( )| < 0.6 |cos( )| > 0.6 ψ ψ X(3872) 6 J/ J/ 10 PRL 98, 132002 data points PC -+ PC ++ Simulated J =1 Simulated J =2 θ θ θ θ |cos( )| < 0.5 |cos( )| > 0.5 |cos( )| < 0.5 |cos( )| > 0.5 π π π π π π π π 400 5 10 acc. corrected prediction for 300 ++ 0 4 10 p t -- 1 s data ++ 1 200 3 p 10 2 -+ p 100 2 10 0 π π 0 0.63 1.15 /2 0 0.63 1.15 /2 -200 -100 0 100 200 π π 0 0.63 1.15 /2 0 0.63 1.15 /2 t L L -+ ++ = -2 ln[ (2 )/ (1 ) ] ∆ Φ π π || - | - /2| �� Quantum numbers J PC = 1 ++ �� Michal Kreps – Exotic meson spectroscopy at LHCb 6 28 October 2014

What is X ( 3872 ) ? �� Lot has been done for X (3872) �� Despite all effort during 10 years, our understanding of what �� X (3872) is still about same �� To find convincing case of non-conventional meson is hard �� Michal Kreps – Exotic meson spectroscopy at LHCb 7 28 October 2014

Z ( 4430 ) + history Belle PRL 100, 142001 30 θ Flat cos (b) Candidates K ψ π - (2S) K moments 400 ψ π - J/ K moments Events/0.01 GeV PRD 79, 112001 20 200 10 0 0 3.8 4.05 4.3 4.55 4.8 M( π + ψ ι ) (GeV) (d) -,0 → ψ π - 0,+ B (2S) K 200 �� Seen by Belle, but not �� Residuals Babar 0 �� Data consistent �� Charged state �� -200 �� → Cannot be cc 3.8 4 4.2 4.4 4.6 4.8 2 m (GeV/c ) �� Latest Belle result uses 4D ψ π - (2S) �� analysis �� Is it real and if yes, is it resonance? �� Michal Kreps – Exotic meson spectroscopy at LHCb 8 28 October 2014

Z ( 4430 ) + history Belle (a) 30 Belle PRL 100, 142001 30 20 2 Events/10 MeV/c Events/0.01 GeV 10 PRD 79, 112001 20 0 10 B A B AR (*1.18) (b) 30 20 0 3.8 4.05 4.3 4.55 4.8 M( π + ψ ι ) (GeV) 10 �� Seen by Belle, but not �� 0 �� Babar 2 Diff./10 MeV/c (c) 10 �� Data consistent �� 0 �� Charged state -10 �� χ �� 2 /NDF = 54.7/58 -20 → Cannot be cc 3.8 4 4.2 4.4 4.6 4.8 �� Latest Belle result uses 4D 2 m (GeV/c ) - ψ π �� (2S) �� analysis �� Is it real and if yes, is it resonance? �� Michal Kreps – Exotic meson spectroscopy at LHCb 8 28 October 2014

Exotic meson spectroscopy at LHCb M. Kreps Physics Department - PowerPoint PPT Presentation

Exotic meson spectroscopy at LHCb M. Kreps Physics Department www2.warwick.ac.uk Introduction In the quark model we think of hadrons as qq or qqq

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