JSA/HUGS Fellowship Seminar-2016

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Presentation transcript:

JSA/HUGS Fellowship Seminar-2016 Rajesh Sangem IIT Bombay, India JSA/HUGS Fellowship Seminar-2016

Outline Gluon TMDs Quarkonium Models Conclusion

Parton Distribution Functions (PDFs) Collinear pdf Universality ANL s=4.9 GeV BNL s=6.6 GeV FNAL s=19.4 GeV RHIC s=62.4 GeV Figure by C. Aidala In 1990, D. Sivers proposed that SSA can be explained by considering correlation between transverse momentum of parton and polarization of hadron.

Transverse Momentum Dependent (TMD) Distributions TMD pdf Non-trivial Universality 1D Collinear pdf Universality

P. J. Mulders and J. Rodrigues PRD 63 094021(2001) Gluon Correlator Parameterization of gluon correlator at “Leading Twist ” is Unpolarized gluon TMD Linearly polarized gluon TMD

Leading Twist Gluon TMDs Gluons Target Unpolarized Circularly Linearly Longitudinal Transverse D. Boer et al arXive 1507.05267 Boer-Mulders Kotzinian-Mulders Pretzelosity Sivers

Linearly Polarized Gluons No experimental investigation has been carried out to extract the until now . Theoretical upper bound D. Boer et al. PRL 106 132001 (2011) In proton-proton collision Dunnen, Lansberg, Pisano, Schlegel, PRL 112, 212001 (2014) Qiu, Schlegel, Vogelsang, PRL 107, 062001 (2011) D. Boer et al. PRL 108, 032002 (2012) D. Boer, C. Pisano, PRD 86, 094007 (2012) In electron-proton scattering C. Pisano et al. JHEP 10 (2013) 024

Quarkonium Models Color Singlet Model (CSM) Color Octet Model (COM) X PDF P Non pert Color Singlet Model (CSM) Color Octet Model (COM) Color Evaporation Model (CEM)

The cross section for Quarkonium production in CEM is

Using QCD factorization theorem Convolution of TMDs is Model Independent property Linearly polarized gluons do not affect the -integrated cross section At least two nodes in

TMDs Parameterization TMDs exhibit Gaussian distribution Evolution in collinear PDFs No Evolution in DGLAP Evolution D. Boer, C. Pisano, PRD 86, 094007 (2012)

Define

Spectrum in DGLAP Evolution SR Asmita PRD 93 054018 (2016)

Rapidity Spectrum in DGLAP Evolution SR Asmita PRD 93 054018 (2016)

TMD Evolution In Collins-Soper-Sterman (CSS) Evolution formalism, TMD pdfs depends on Collins-Soper equation and RGE for TMD No integral as in DGLAP J. Collins, Foundations of Perturbative QCD, 2011 S. M. Aybat et al. PRD 85 034043 (2012)

TMD Evolution CSS TMD Evolution , J. Collins, Foundations of Perturbative QCD, 2011 S. M. Ayabt et al. PRD 83 114042 (2011) ,

Spectrum in TMD Evolution

Results in TMD Evolution

Conclusion The and distributions of quarkonium can been modulated by the presence of linearly polarized gluons in unpolarized proton proton collision. Hence, the production of quarkonium is a promising process to probe the No angular analysis is needed to probe linearly polarized gluons

Comments & Suggestions Thank You

Matching with Experimental data

Differential Cross Section in DGLAP approach

Differential Cross Section in TMD Evolution approach

Resummation of Sudakov logarithms The region of low is strongly influenced by initial state gluon radiation showers These additional gluon radiation from initial state partons leads to logarithmic corrections for each gluon radiation of the form Collins Soper Sterman (CSS) Evolution formalism has been used to resum the large logarithmic terms to all order in

Backup Rapidity Spectrum in DGLAP Evolution

Backup Rapidity Spectrum in TMD Evolution

Backup DGLAP and TMD Comparison