Post on 08-Jan-2016
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HSQCD 2004May 19, 2004
BFKL and High Energy
PhenomenologyVictor T. Kim
Gatchina
St. Petersburg Nuclear Physics Institute
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
Outline
• BFKL: introduction• BFKL: jet production• BFKL: gamma-gamma collisions• summary
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
LO BFKL: Fadin, Kuraev & Lipatov (75-77) Balitsky & Lipatov (78) Summing leading Log(s) in all orders: σ ~ (s/s0)ω
Bottom lines: ω ≈ 0.5 too big! no running αS
s0 ?
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
NLO BFKL with BLM resummation
Brodsky, Fadin, VK, Lipatov & Pivovarov (98-99)
Summing β0-terms into the scale of running coupling
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
Mueller-Navelet factorization
Mueller & Navelet (87)
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
kT-factorization scheme
Catani, Hauptmann & Marchesini; Ciafaloni (90-94)Levin, Ryskin, Shabelsky & Shuvaev (91)Collins & K. Ellis (91)
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
BFKL-factorization
VK & Pivovarov (96-98)
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
BFKL: dijet production
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
Dijet azymuthal decorrelation
VK & Pivovarov (96,98)
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
Dijet K-factor
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
Jet xT-scaling ratio
VK & Pivovarov (98)
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
Gamma-gamma collisions
Gribov,Flolov & Lipatov (70)
LO BFKL Balitsky & Lipatov (78)Brodsky,Hautmann & Soper (97)Bartels et al (98)De Roeck et al (2001)
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
Gamma-gamma collisions
LO BFKL:Balitsky & Lipatov (78)Brodsky,Hautmann & Soper (96-97)Bartels et al (97)De Roeck et al (99)
NLO BFKL: VK, Lipatov & Pivovarov (99)Brodsky, Fadin, VK, Lipatov & Pivovarov (01-02)Kwiecinski & Motyka (01)
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
Brodsky, Fadin, VK, Lipatov & Pivovarov (01-02)
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
Linear colliders
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
Gamma-gamma to heavy quarks
LO BFKLBalitsky & Lipatov (78)Kwiecinski & Motyka (99)Bartels, Ewerz et al (99)Ginzburg (01)
NLO BFKLVK & Lipatov
few nb
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
Summary
• NLO BFKL becomes noticeable in gamma-gamma at high energies • Jet production ?• Heavy quarks ?• Monte Carlo generators needed • BFKL factorization ? • Unitarity corrections ?
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute
HSQCD 2004May 19, 2004
Victor T. KimSt.Petersburg Nuclear Physics Instiutute