Hot quarkonium spectral functions from QCD sum rules and MEM Heavy quarks and quarkonia in thermal ECT*, Villazzano, Italy 5. 4. 2013 Philipp Gubler.

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Presentation transcript:

Hot quarkonium spectral functions from QCD sum rules and MEM Heavy quarks and quarkonia in thermal ECT*, Villazzano, Italy Philipp Gubler (RIKEN, Nishina Center) Collaborators: M. Oka (Tokyo Tech), K. Morita (YITP), K. Suzuki (Tokyo Tech) P. Gubler and M. Oka, Prog. Theor. Phys. 124, 995 (2010). P. Gubler, K. Morita and M. Oka, Phys. Rev. Lett. 107, (2011). K. Suzuki, P. Gubler, K. Morita and M. Oka, Nucl. Phys. A897, 28 (2013).

Contents Introduction The method: QCD sum rules and the maximum entropy method Sum rule results for quarkonium + bottomonium Conclusions

Introduction: Quarkonia General Motivation: Understanding the behavior of matter at high T. - Phase transition: QGP (T>T c ) ↔ confining phase (T<T c ) - Currently investigated at RHIC and LHC - Heavy Quarkonium: clean probe for experiment

QCD sum rules In QCD sum rules one considers the following correlator: For mesons: Complicated interaction governed by QCD. For baryons: M.A. Shifman, A.I. Vainshtein and V.I. Zakharov, Nucl. Phys. B147, 385 (1979); B147, 448 (1979).

In the region of Π(q) dominated by large energy scales such as it can be calculated by the operator product expansion (OPE): perturbative Wilson coefficients non-perturbative condensates

On the other hand, we consider the above correlator in the region of where the optical theorem (unitarity) gives physical states the spectral function

Relating the two regions: the dispersion relation After the Borel transormation:

The basic problem to be solved given (but only incomplete and with error) ? “Kernel” This is an ill-posed problem. But, one may have additional information on ρ(ω), which can help to constrain the problem: - Positivity: - Asymptotic values:

First applications in the light quark sector Experiment: m ρ = 0.77 GeV F ρ = GeV PG and M. Oka, Prog. Theor. Phys. 124, 995 (2010). ρ-meson channelNucleon channel Experiment: m N+ = 0.94 GeV, m N- = 1.54 GeV K. Ohtani, PG and M. Oka, Eur. Phys. J. A 47, 114 (2011). 970 MeV positive parity negative parity 1570 MeV K. Ohtani, PG and M. Oka, Phys. Rev. D 87, (2013).

The quarkonium sum rules at finite T The application of QCD sum rules has been developed in: T. Hatsuda, Y. Koike and S.H. Lee, Nucl. Phys. B 394, 221 (1993). depend on T Compared to lattice: - Continuum, infinite volume calculation: no cutoff or finite volume effects - Same kernel and same number of data points at T=0 and T≠0 A.I. Bochkarev and M.E. Shaposhnikov, Nucl. Phys. B 268, 220 (1986). However: - Effects of higher order terms of the OPE are difficult quantify

The T-dependence of the condensates taken from: K. Morita and S.H. Lee, Phys. Rev. D82, (2010). G. Boyd et al, Nucl. Phys. B 469, 419 (1996). O. Kaczmarek et al, Phys. Rev. D 70, (2004). The values of ε(T) and p(T) are obtained from quenched lattice calculations: K. Morita and S.H. Lee, Phys. Rev. Lett. 100, (2008). Considering the trace and the traceless part of the energy momentum tensor, one can show that in tht quenched approximation, the T-dependent parts of the gluon condensates by thermodynamic quantities such as energy density ε(T) and pressure p(T).

A first test: mock data analysis

m η ｃ =3.02 GeV (Exp: 2.98 GeV) m J/ψ =3.06 GeV (Exp: 3.10 GeV) m χ0 =3.36 GeV (Exp: 3.41 GeV) m χ1 =3.50 GeV (Exp: 3.51 GeV) PG, K. Morita and M. Oka, Phys. Rev. Lett. 107, (2011). Charmonium at T=0 S-waveP-wave

S-waveP-wave PG, K. Morita and M. Oka, Phys. Rev. Lett. 107, (2011). Charmonium at finite T

What is going on behind the scenes ? T=0T=1.0 T c T=1.1 T c T=1.2 T c The OPE data in the Vector channel at various T: cancellation between α s and condensate contributions

Comparison with lattice results Lattice data are taken from: A. Jakovác, P. Petreczky, K. Petrov and A. Velytsky, Phys. Rev. D 75, (2007). Imaginary time correlator ratio:

S-waveP-wave K. Suzuki, PG, K. Morita and M. Oka, Nucl. Phys. A897, 28 (2013). Bottomonium at finite T

What about the excited states? Exciting results from the LHC! S. Chatrchyan et al. [CMS Collaboration], arXiv: [nucl-ex]. Is it possible to reproduce this result with our method? Our resolution might not be good enough.

Extracting information on the excited states However, we can at least investigate the behavior of the residue as a function of T. Fit using a Breit-Wigner peak + continuumFit using a Gaussian peak + continuum A clear reduction of the residue independent on the details of the fit is observed. Consistent with melting of Y(3S) and Y(2S) states in the temperature region of 1.5 ~ 2.0 T c. K. Suzuki, PG, K. Morita and M. Oka, Nucl. Phys. A897, 28 (2013).

Remaining issues Higher order gluon condensates?  Has to be checked! Lattice calculation is needed. Higher orders is α s ?  Are potentially large. Need some sort of resummation? Division between high- and low-energy contributions in OPE?  Is a problem at high T. Needs to be investigated carefully.

Conclusions We have shown that MEM can be applied to QCD sum rules The resolution of the method is limited, therefore it is generally difficult to obtain the peak-width We could observe the melting of the S-wave and P-wave quarkonia and estimated the corresponding melting temperatures

Backup slide

Estimation of the error of G(M) Gaussianly distributed values for the various parameters are randomly generated. The error is extracted from the resulting distribution of G OPE (M). D.B. Leinweber, Annals Phys. 322, 1949 (1996). PG, M. Oka, Prog. Theor. Phys. 124, 995 (2010).