April 20-24, 2006 DIS 2006 1 Soft Gluon Ressumation in Effective Field Theory Feng Yuan, RBRC, Brookhaven National Laboratory References: Ildibi, Ji, Yuan,

Slides:



Advertisements
Similar presentations
Soft gluon resummation in transversely polarized Drell-Yan process at small transverse momentum NPB777 (07) 203 and more double-spin asymmetries and novel.
Advertisements

Ignazio Scimemi Universidad Complutense de Madrid (UCM) In collaboration with A. Idilbi, M. García Echevarría A.I., I.S. Phys. Lett. B695 (2011) 463, M.G.E.,
Polarized structure functions Piet Mulders ‘Lepton scattering and the structure of nucleons and nuclei’ September 16-24, 2004
Max-Planck-Institute for Physics Werner-Heisenberg-Institut Munich André H. Hoang 6th Vienna Central European Seminar, Nov , 2009 Soft-Collinear-Effective.
Nonperturbative Effects from Soft-Collinear Effective Theory Christopher Lee Institute for Nuclear Theory, University of Washington 12 January 2006.
Iain Stewart MIT Iain Stewart MIT Nonleptonic Decays and the Soft Collinear Effective Theory Super B Factory Workshop, Hawaii, 2004.
Resummation of Large Logs in DIS at x->1 Xiangdong Ji University of Maryland SCET workshop, University of Arizona, March 2-4, 2006.
1 SCET for Colliders Matthias Neubert Cornell University LoopFest V, SLAC – June 21, 2006 Based on work with Thomas Becher (FNAL) and Ben Pecjak (Siegen)
Ahmad Idilbi Uni. Regensburg TUM November 30, 2011 M. G. Echevarria, A. Idilbi, I. Scimemi, arXive: : [hep-ph] M. G. Echevarria, A. Idilbi, I.
From Factorization to Resummation for Single Top Production at the LHC with Effective Theory Chong Sheng Li ITP, Peking Unversity Based on the work with.
QCD Resummations for Hadronic Collisions Werner Vogelsang RBRC and BNL Nuclear Theory RHIC/AGS Users’ Meeting 2005.
Method of Regions and Its Applications The Interdisciplinary Center for Theoretical Study, USTC 1 Graduate University of the CAS Deshan Yang.
Xiangdong Ji University of Maryland/SJTU Physics of gluon polarization Jlab, May 9, 2013.
9/17/20151 Probing the Dense Medium in Cold Nuclei -- Gluon Saturation at small-x Bowen Xiao (CCNU) Feng Yuan (LBNL)
9/19/20151 Semi-inclusive DIS: factorization Feng Yuan Lawrence Berkeley National Laboratory RBRC, Brookhaven National Laboratory.
Zhongbo Kang Los Alamos National Laboratory Transverse single spin asymmetry of the W production at RHIC RHIC-AGS Annual Users’ Meeting 2015 June 9-12,
1 Threshold Resummation Effects in polarized DY at GSI and J-PARC EPOCHAL Tsukuba, Tsukuba, JAPAN, 4/20-24(2006) Ref. H.Shimizu, G.Sterman, W.Vogelsang,
1 Transverse weighting for quark correlators QCD workshop, JLAB, May 2012 Maarten Buffing & Piet Mulders
Quark Helicity Distribution at large-x Collaborators: H. Avakian, S. Brodsky, A. Deur, arXiv: [hep-ph] Feng Yuan Lawrence Berkeley National Laboratory.
Xiangdong Ji 季向东 University of Maryland & 北京大学 & 中科院理论物理所.
Breakdown of NRQCD Factorization ?? J. P. Ma Institute of Theoretical Physics, Beijing 北京 May Taipei Summer Institute on Strings, Particles.
6/1/20161 TMD Evolution Feng Yuan Lawrence Berkeley National Laboratory.
Single (transverse) Spin Asymmetry & QCD Factorization Single (transverse) Spin Asymmetry & QCD Factorization Xiangdong Ji University of Maryland — Workshop.
A Short Introduction to the Soft-Collinear Effective Theory Sean Fleming Carnegie Mellon University |V xb | and |V tx | A workshop on semileptonic and.
May 18-20, 2005 SIR05 JLab 1 P ? Dependence of SSA -- from nonpert. to pert. Feng Yuan, RBRC, Brookhaven National Laboratory References: Ji, Ma, Yuan,
11/5/20151 Energy Evolution of Sivers asymmetry in Hard Processes Feng Yuan Lawrence Berkeley National Laboratory.
Zhongbo Kang Los Alamos National Laboratory QCD structure of the nucleon and spin physics Lecture 5 & 6: TMD factorization and phenomenology HUGS 2015,
Unintegrated parton distributions and final states in DIS Anna Stasto Penn State University Work in collaboration with John Collins and Ted Rogers `
Transverse Momentum Resummation for Higgs Production at Hadron Colliders Chong Sheng Li School of Physics, Peking University 2012 海峡两岸粒子物理与宇宙学研讨会 ,
11/28/20151 QCD resummation in Higgs Boson Plus Jet Production Feng Yuan Lawrence Berkeley National Laboratory Ref: Peng Sun, C.-P. Yuan, Feng Yuan, PRL.
QCD-2004 Lesson 2 :Perturbative QCD II 1)Preliminaries: Basic quantities in field theory 2)Preliminaries: COLOUR 3) The QCD Lagrangian and Feynman rules.
PQCD mechanisms for single (transverse) spin asymmetry in Drell-Yan production PQCD mechanisms for single (transverse) spin asymmetry in Drell-Yan production.
September 3, 2005 Heraeus Summer School 1 Lecture 2 Factorization in Inclusive B Decays Soft-collinear factorization Factorization in B→X s γ decay m b.
Threshold Resummation for Top- Quark Pair Production at ILC J.P. Ma ITP, CAS, Beijing 2005 年直线对撞机国际研讨会, Tsinghua Univ.
Resummation of Large Endpoint Corrections to Color-Octet J/  Photoproduction Adam Leibovich University of Pittsburgh 10/17/07 With Sean Fleming and Thomas.
Progress on Heavy Colored Particle Thresholds Pedro D. Ruiz-Femenía Max-Planck-Institute für Physik (Werner-Heisenberg-Institut) International Linear Collider.
Theoretical tools for non-leptonic B decays
CKM, Dec Aneesh Manohar & I.S. hep-ph/ Arnesen, Ligeti, Rothstein, & I.S. hep-ph/ ; Lange, Manohar, & I.S. hep-ph/0? ? ?001 Iain Stewart.
TMDPDF: A proper Definition And Its Evolution Ahmad Idilbi University Of Regensburg QCD Evolution 2012 Workshop Jefferson LAB, May 15 M. G. Echevarria,
2/10/20161 What can we learn with Drell-Yan in p(d)-nucleus collisions Feng Yuan Lawrence Berkeley National Laboratory RBRC, Brookhaven National Laboratory.
1 Sudakov and heavy-to-light form factors in SCET Zheng-Tao Wei Nankai University , KITPC, Beijing.
DIS’03 St.Petersburg April 23-27, 2003 V. Fadin Institute of Nuclear Physics, Novosibirsk WGA Theory Low x BFKL and DGLAP BK Structure functions Diffraction.
Relating e+e- annihilation to high energy scattering at weak and strong coupling Yoshitaka Hatta (U. Tsukuba) JHEP 11 (2008) 057; arXiv: [hep-ph]
The Two-Loop Anomalous Dimension Matrix for Soft Gluon Exchange S. M. Aybat, L.D., G. Sterman hep-ph/ , Workshop HP 2, ETH Zürich September.
Hiroyuki Kawamura (RIKEN) Soft-gluon resummation in Drell-Yan dilepton (and vector boson) production at small transverse momentum: spin asymmetries and.
David Farhi (Harvard University) Work in progress with Ilya Feige, Marat Freytsis, Matthew Schwartz SCET Workshop, 3/27/2014.
Perturbative QCD in Nuclear Environment Jianwei Qiu Iowa State University Student Lecture at Quark Matter 2004 Oakland – January 11, 2004 Table of Contents:
I. Scimemi, with Ambar Jain and Iain Stewart, MIT, Cambridge 1 EF07,Paris.
Gluon Evolution at small-x : Extending the PT Domain of QCD Dimitri Colferai University of Firenze M. Ciafaloni G.P. Salam A.M. Stasto In collaboration.
Refactorizing NRQCD short-distance coefficients in exclusive quarkonium production KITPC-EFT in Nuclear Physics & Particle Physics 1 Based on.
11/19/20161 Transverse Momentum Dependent Factorization Feng Yuan Lawrence Berkeley National Laboratory RBRC, Brookhaven National Laboratory.
RBRC & BNL Nuclear Theory
seminar at Academia Sinica
Single-Transverse Spin Asymmetries in Hadronic Scattering
Introduction to pQCD and TMD physics
Lecture 2 Evolution and resummation
Semi-inclusive DIS at Small-x
Can We Learn Quark Orbital Motion from SSAs?
Unique Description for SSAs in DIS and Hadronic Collisions
RBRC and BNL Nuclear Theory
Adnan Bashir, UMSNH, Mexico
TMDs in nuclei Jian Zhou Temple University
The top quark jet mass at 2 loops
Unique Description for Single Transverse Spin Asymmetries
Heavy-to-light transitions on the light cone
Unifying the Mechanisms for SSAs in Hard Process
QT resummation in transversely polarized Drell-Yan process
Factorization in some exclusive B meson decays
Calculation of Pure Annihilation Type B Decay in PQCD Approach
Y.Kitadono (Hiroshima ),
Presentation transcript:

April 20-24, 2006 DIS Soft Gluon Ressumation in Effective Field Theory Feng Yuan, RBRC, Brookhaven National Laboratory References: Ildibi, Ji, Yuan, PLB 625, 253 (2005); Ildibi, Ji, Ma, Yuan, PRD73, (2006).

April 20-24, DIS 2006 Two Large Scales Generate Large Double Logs in pQCD For example, a differential cross section depends on Q 1, where Q 2 À Q 1 2 À  QCD 2 For example, a differential cross section depends on Q 1, where Q 2 À Q 1 2 À  QCD 2 We have to resum these large logs to make reliable predictions We have to resum these large logs to make reliable predictions Q ? : Dokshitzer, Diakonov, Troian, 78; Parisi Petronzio, 79; Collins, Soper, Sterman, 85 Q ? : Dokshitzer, Diakonov, Troian, 78; Parisi Petronzio, 79; Collins, Soper, Sterman, 85 Threshold: Sterman 87; Catani and Trentadue 89 Threshold: Sterman 87; Catani and Trentadue 89

April 20-24, DIS 2006 Soft-Collinear Effective Theory Effective Theory approach Effective Theory approach Choose low-energy degree of freedom Choose low-energy degree of freedom Soft, Collinear fields (  n, A n, A s, …) Soft, Collinear fields (  n, A n, A s, …) Write down effective Lagrangian through gauge symmetry and power counting Write down effective Lagrangian through gauge symmetry and power counting Applications: Applications: Derive factorization theorems consistent with low energy degree of freedom Derive factorization theorems consistent with low energy degree of freedom Derive twist expansion for complicated QCD processes (B   decay, B  D decay, jet structure) Derive twist expansion for complicated QCD processes (B   decay, B  D decay, jet structure) Resumming large logarithms Resumming large logarithms Bauer, Fleming, Pirjol, Stewart

April 20-24, DIS 2006 Two Steps Matching At scale Q, match the quark (gluon) current between full QCD and SCET At scale Q, match the quark (gluon) current between full QCD and SCET Derive the matching coefficient and the anomalous dimension, which controls the running Derive the matching coefficient and the anomalous dimension, which controls the running At lower scale in SCET, match to the (product of) parton distribution, like a usual pQCD factorization for the cross section At lower scale in SCET, match to the (product of) parton distribution, like a usual pQCD factorization for the cross section

April 20-24, DIS 2006 Resummation in SCET DIS Structure function at large x, Manohar, 03 DIS Structure function at large x, Manohar, 03 Two scales, Q 2, (1-x) Q 2 Two scales, Q 2, (1-x) Q 2 Extended to Drell-Yan, Idilbi, Ji, 05 Extended to Drell-Yan, Idilbi, Ji, 05 Applications to Q ? resummation Applications to Q ? resummation Gao, Li, Liu, NLL, 05 Gao, Li, Liu, NLL, 05 Idilbi, Ji, Yuan, NLL, 05 Idilbi, Ji, Yuan, NLL, 05 All order equivalence for threshold resummation All order equivalence for threshold resummation Idilbi, Ji, Ma, Yuan, 05 Idilbi, Ji, Ma, Yuan, 05

April 20-24, DIS 2006 Matching at Q At scale Q, one can integrate out the fluctuations of order Q. Since all other scales are small, we can set them to zero, and the processes are very similar to elastic form factors. Therefore, the integration can be done by matching the full theory current to effective theory current, and only virtual diagrams contribute At scale Q, one can integrate out the fluctuations of order Q. Since all other scales are small, we can set them to zero, and the processes are very similar to elastic form factors. Therefore, the integration can be done by matching the full theory current to effective theory current, and only virtual diagrams contribute

April 20-24, DIS 2006 Form Factors High order corrections to the current in the full theory is represented as on-shell quark (gluon) form factors, High order corrections to the current in the full theory is represented as on-shell quark (gluon) form factors, F(Q 2,  )=1+  s F (1) +  s 2 F (2) +  Similarly, we can also calculate the form factors in the effective theory, which has the same IR structure as the full theory form factor. So their matching can be expressed as Similarly, we can also calculate the form factors in the effective theory, which has the same IR structure as the full theory form factor. So their matching can be expressed as F(Q 2,  )=C(Q 2 /  2 )F eff (Q 2 /  2,  )

April 20-24, DIS 2006 Matching coefficients at  =M H The matching C(M H ) can be expanded in terms of  s (M H ) The matching C(M H ) can be expanded in terms of  s (M H )

April 20-24, DIS 2006 Anomalous dimension The anomalous dimension controls the running of C(  ) The anomalous dimension controls the running of C(  ) Using the current known quark (gluon) form factors up to three-loop (MVV 05) Using the current known quark (gluon) form factors up to three-loop (MVV 05) A (i), the cusp anomalous dimension A (i), the cusp anomalous dimension B (i), the  (1-x) coefficient in the splitting function B (i), the  (1-x) coefficient in the splitting function f (i), a universal structure, similar to A (i) f (i), a universal structure, similar to A (i)

April 20-24, DIS 2006 Matching at  L Can be calculated from the cross section, Can be calculated from the cross section,  eff (  ) L )=M N (  ) L ) ­ f 1 (  L ) ­ f 2 (  L ) A detailed formulation in EFT is not necessary, rather we can use the result from the full QCD calculations in the soft-collinear limit, A detailed formulation in EFT is not necessary, rather we can use the result from the full QCD calculations in the soft-collinear limit, M N is universal, C A ->C F will give the quark one M N is universal, C A ->C F will give the quark one

April 20-24, DIS 2006 Final Result for the Threshold Resummation The cross section in the moment space, The cross section in the moment space, C(M H ) and M N (  L ) only depend on  s, the large logs are contained in the exponential factor C(M H ) and M N (  L ) only depend on  s, the large logs are contained in the exponential factor

April 20-24, DIS 2006 Exponential Form Factor  1 controls running from M H to  L =M H /N,  2 controls  L to  F  1 controls running from M H to  L =M H /N,  2 controls  L to  F A 1, A 2, B 1, B 2 are known and calculated up to 3- loop, and introduce the third integral, A 1, A 2, B 1, B 2 are known and calculated up to 3- loop, and introduce the third integral,

April 20-24, DIS 2006 Final result Final result N-dependent terms are entirely in I 1, I 2, I 3 N-dependent terms are entirely in I 1, I 2, I 3

April 20-24, DIS 2006 All Orders Equivalence In conventional resummation formalism In conventional resummation formalism Sterman 87, Catani and Trentadue 89 Sterman 87, Catani and Trentadue 89 All order relation between these two All order relation between these two I 1 +I 2 +I 3 =I M +ln C G with

April 20-24, DIS 2006 At three-loop We have calculated D (2) and D (3) from SCET formalism, agree with the results from full theory expansions (Vogt, et al., 05) We have calculated D (2) and D (3) from SCET formalism, agree with the results from full theory expansions (Vogt, et al., 05)

April 20-24, DIS 2006 Conclusion As a perfect tool, SCET has shown great ability to do resummation for the Q ? and threshold cases As a perfect tool, SCET has shown great ability to do resummation for the Q ? and threshold cases SCET provide an intuitive way to understand the resummation, and it is much simpler to perform the calculations SCET provide an intuitive way to understand the resummation, and it is much simpler to perform the calculations Further application of SCET to higher order corrections and other processes are desirable Further application of SCET to higher order corrections and other processes are desirable