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Precision Holographic Baryons PILJIN YI (KIAS) Baryons 2010, Osaka, December 2010 Koji Hashimoto Deog-Ki Hong Norihiro Iizuka Youngman Kim Sangmin Lee.

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Presentation on theme: "Precision Holographic Baryons PILJIN YI (KIAS) Baryons 2010, Osaka, December 2010 Koji Hashimoto Deog-Ki Hong Norihiro Iizuka Youngman Kim Sangmin Lee."— Presentation transcript:

1 Precision Holographic Baryons PILJIN YI (KIAS) Baryons 2010, Osaka, December 2010 Koji Hashimoto Deog-Ki Hong Norihiro Iizuka Youngman Kim Sangmin Lee Jaemo Park Mannque Rho Ho-Ung Yee H. Hata K.Hashimoto T. Sakai S. Sugimoto S. Yamato ?

2 with a string theoretical holographic QCD model of very few adjustable parameters, can one do qualitative/quantitative particle physics of baryons and mesons ?

3 1.holography keeps color-singlets ( large N master fields ) only: no trace of color indices remains in the D>4 holographic description 2.holography elevates a continuous global symmetry to a gauge symmetry: 4D flavor symmetry  5D flavor gauge symmetry

4 Sakai, Sugimoto., 2004

5 chiral symmetry = 5D large gauge transformation

6 D8’s anti-D8’s D8’s D4’s string theory origin: nonAdS/nonCFT with D4/D8-branes

7 vs an extra UV parameter that appears because the underlying color theory is an open string theory and becomes QCD only at low energy IR flavor coupling function: it dictates all couplings and mass distributions (with ) in the flavor sector warp factor

8 1.holography keeps color-singlets ( large N_c master fields) only: no trace of original color indices remains in the dual string theory in 5D 3.holographic description becomes a controllable effective field theory, as stringy components become decoupled 2.holography elevates a continuous global symmetry to a gauge symmetry: 4D flavor symmetry  5D flavor gauge theory

9 Sakai, Sugimoto., 2004

10 starting with this holographic effective action of mesons, realize the baryon as a coherent state (quantized soliton) & derive the effective action thereof with no new parameter

11 Hong, Rho, Yee, P.Y., 2007 to be used at tree-level only, as dictated by the holography

12 5D  4D : pseudoscalars & spin 1 mesons massive spin 1 mesons from gauge-Higgsing pseudoscalars from open Wilson line

13 5D flavor gauge theory  4D chiral theory of mesons

14 extrapolation to real QCD

15 Sakai+Sugimoto, 2004

16 also, consistent with E. Witten’s large N_c prediction ! NPB156, (1979)

17 2.holography elevates a continuous global symmetry to a gauge symmetry: 4D flavor symmetry  5D flavor gauge theory baryon number  5D gauge U(1) charge

18 U(1) charge = N  solitonic baryon

19 classical size Hong, Rho, Yee, Yi, hep-th/ Hata, Sakai, Sugimoto, Yamato, hep-th/ this soliton size has little to do with either the charge radius or with the repulsive core seen by NN the latter two are separately computable and dictated by the couplings to spin 1 mesons and their masses

20 Compton size << soliton size << meson Compton sizes  the shape of the classical soliton is trustworthy, yet, it can still be treated point-like for interaction with mesons  the baryon field

21 then, after a long song and dance…….

22 Hong, Rho, Yee, P.Y., 2007

23 5D minimal coupling 5D mass function 5D tensor coupling Hong, Rho, Yee, P.Y., 2007 the holographic origin of 1. the leading axial coupling to pions, 2. nucleon anomalous magnetic moments, 3. minimal couplings to axial vectors, 4. tensor couplings to vectors, etc

24 leading in Hong, Rho, Yee, P.Y., 2007 leading in

25 Hong, Rho, Yee, P.Y., 2007

26 an effective action for 4D nucleons/mesons

27 nucleon iso-singlet/triplet (axial-)vector mesons quartic terms also present but not shown

28 all tensor couplings vanish identically, (meaning that coefficients of the respective leading 1/ N behavior vanish, and, thus, is NOT a consequence of large N counting) except for those associated with the tower of rho mesons Kim, Lee, P.Y numbers

29 nucleon R. Machaleidt, in Advances in Nuclear Physics, Vol. 19 Edited by J. W. Negele and E. Vogt (Plenum, New York, 1986), Kim, Lee, P.Y. 2009

30 from 5D minimal term from 5D tensor term numbers nucleon Hoehler, Pietarinen, 1975 Stoks, Klomp, Terheggen, de Swart, 1994 Machleidt, 2001 Gross, Stadler, 2007

31 numbers nucleon pions nucleon it represents about 1/3 improvement over that of the Skyrmion picture a la Adkins-Nappi-Witten at 0.61

32 numbers nucleon pions nucleon ? Hong, Rho, Yee, P.Y.,2007

33 E&M charge form factor: complete vector dominance again

34

35 NN potential

36 a universal repulsive core between baryons from 5D Coulomb repulsion due to the baryon number as a gauge U(1) charge Kim, Zahed, 2009 Hashimoto, Sakai, Sugimoto, 2009 Lee, Kim, P.Y., 2009

37 two-body nucleon potential from meson exchanges: large N limit Kim, Lee, P.Y. 2009

38

39 two-body nucleon potential from meson exchanges: N=3

40 issues quenched  no practical answer here, yet chiral limit  mass deformation by a technicolor ? chiral condensate invisible  string theory tachyon ? because of this(?), order one mismatch of mass scales between the glueball sector / the meson sector / the baryon sector

41 things to do compute physical processes directly within this model for meaningful comparisons with data better handling of many nucleon system dense matter in general incorporation of gravity  neutron star understand why such naïve extrapolation from holographic limit sometimes work at all for some quantities

42 a stringy alternative to address many nucleon system ? matrix baryons K.Hashimoto, N.Iizuka, P.Y., 2010 next talk by Koji


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