T. Csörgő1, R. J. Glauber2, F. Nemes1 , J. Velasco3

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Presentation transcript:

Multiple diffraction theory of elastic pp scattering, with applications to 7 TeV pp data T. Csörgő1, R. J. Glauber2, F. Nemes1 , J. Velasco3 1 Wigner RCP, Budapest, Hungary 2 Harvard University, Cambridge, MA, USA 3 IFIC, University of Valencia, Valencia, Spain

Introduction to Diffraction Glauber-Velasco model Some Old-New Results Non-exponential behaviour of ds/dt at low-t Analysis of TOTEM/LHC p+p @ 7 TeV New results, generalized Glauber & Velasco Imaging with shadow profile functions from ISR to LHC Summary arxiv:1306.4217 arxiv:1311.2308

Diffraction – Hofstadter, Nobel (1961) Diffractive electron scattering on nuclei and the resulting charge density distributions, images of spherical nuclei

Glauber and Matthiae, NPB21 (1970) 135 Diffraction in pA, Glauber and Matthiae, NPB21 (1970) 135 Diffractive proton scattering on nuclei confirms the charge density distributions of spherical nuclei

Diffraction – What have we learned? The volume of spherical nuclei is proportional to A The surface thickness is constant, independent of A → Central charge density of large nuclei is approx constant R. Hofstadter, Nobel Lecture (1961)

What have we learned since WPCF2013? tdip stot ~ C geometric scaling at LHC C = 54.8 ± 0.7 mbGeV2 (data) C ≠ 35.9 mbGeV2 (black disc) NOT in black disck limit arxiv:1311.2308 BEL effect expected: proton becomes Blacker, Edgier, Larger, with increasing √s

Glauber – Velasco model summary F(t): f. sc. amplitude W(b): opacity, complex f(t): cluster averaged parton-parton scattering amplitude -t = q2: momentum transfer b: impact parameter ds/dt: diff. cross-section elastic pp scattering R.J. Glauber and J.Velasco Phys. Lett. B147 (1987) 380 BSWW EM form factors GE

First results @ Low-X 2013: GV works for ds/dt dip Glauber-Velasco (GV) (original) describes ds/dt data Both at ISR and TOTEM@LHC in the dip region arxiv:1311.2308 Note: at low-t GV is ~ exponential Really? Lower energies?

News in 2014: non-exponential at low-t TOTEM preliminary see S. Giani’s talk similar to non-Gaussian features of HBT correlations

Non-exponential at low-t, details TOTEM preliminary see S. Giani’s talk similar to non-Gaussian features of HBT correlations

Glauber and Velasco, PLB147 (1984) 380 Diffraction in pp @ ISR, Glauber and Velasco, PLB147 (1984) 380 Glauber and Velasco, Phys. Lett. B147 (1984) 380 Glauber and Velasco, IFIC preprint, 1996, unpublished Illustration: elastic pp at the ISR energy range 13.7 – 62.7 GeV well described by Glauber-Velasco

Glauber and Velasco, PLB147 (1984) 380 _ Diffraction in pp @ ISR Glauber and Velasco, PLB147 (1984) 380 Glauber and Velasco, Phys. Lett. B147 (1984) 380 Glauber and Velasco, IFIC preprint, 1996, unpublished _ _ Illustration: elastic pp at the SppS energy range 546-630 GeV well described by Glauber-Velasco

Non-exponential pp in GV model _ Non-exponential pp in GV model Figure 4 from Glauber-Velasco PLB 147 (1984) 380 Slope is not quite exponential (for femtoscopy: a non-Gaussian behaviour)

Imaging with shadow profile Glauber and Velasco, Phys. Lett. B147 (1984) 380 Glauber and Velasco, IFIC preprint, 1996, unpublished

Saturation from shadow profiles at 7 TeV proton becomes Blacker, but NOT edgier, and Larger BEL BNeL effect apparent saturation: proton is ~ black at LHC up to r ~ 0.7 fm ISR and SppS: R.J. Glauber and J.Velasco Phys. Lett. B147 (1987) 380 b1,b2 fixed see also Lipari and Lusignoli arXiv:1305.7216 Kohara, Ferreira, Kodama arXiv:1408.1599

BNeL effect proton becomes Blacker, but NOT edgier, and Larger This work see also Lipari and Lusignoli arXiv:1305.7216 Kohara, Ferreira, Kodama arXiv:1408.1599

Shadow imaging in p+p at ISR Opacity expansion of order n: exp(-W) = 1- W + W2/2! - ... Proton image: gray (n=1) edge, dark (n~3) center

Shadow imaging in p+p at LHC Simple choice for the generalization of GV: f(t)/f(0) = exp(i b1 |t| + i b2 |t|2 ) / sqrt( 1 + a t)  sqrt( 1 + a|t| + a1 |t|2 + a2 |t|3 + …) More systematic expansions and further improvements are under investigation. Opacity expansion of order n: exp(-W) = 1-W + W2/2! - ... Proton at 7 TeV: gray (n=1) edge, very dark (n ≥ 4) center

Picture of proton Investigation of Glauber-Velasco model works well in the dip region at LHC but needs extension in low-t TOTEM: non-exponential behaviour geometric scaling but not in the Black Disc limit generalized Glauber-Velasco works well at low-t also at dip-t, but … from BEL to BneL effect Grey at r~ 1 fm, black up to r~0.7 fm

Shadow imaging in p+p at LHC The BnEL effect. Thank You!

Summary Collectivity in Collision in Kolymbari C2K 65th birthday of László Csernai 65 L C2K = 65 L Happy Birthday !

Backup slides

Multiple Diffraction Theory of Elastic proton-proton scattering Definitions and derivations from (1) Glauber and Velasco, Harvard Print 88-0344, Phys. Lett. B147 (1984) 380 (2) Glauber and Velasco, IFIC preprint, 1996, unpublished

Multiple Diffraction Theory of Elastic proton-proton scattering: Glauber-Velasco (1) Glauber and Velasco, Harvard Print 88-0344, Phys. Lett. B147 (1984) 380 (2) Glauber and Velasco, IFIC preprint, 1996, unpublished

Multiple Diffraction Theory of Elastic proton-proton scattering: Glauber-Velasco (1) Glauber and Velasco, Harvard Print 88-0344, Phys. Lett. B147 (1984) 380 (2) Glauber and Velasco, IFIC preprint, 1996, unpublished

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 1 from (1)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 2 from (1)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 3 from (1)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 4 from (1)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 1 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 2 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 3 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 4 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 5 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 6 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 7 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 8 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 9 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 10 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 11 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 12 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 13 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 14 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 15 from (2)

Figures from (1) Glauber and Velasco, Harvard Print 88-0344, PLB 147(1984) 380 and (2) Glauber and Velasco, IFIC preprint, 1996, unpublished Figure 16 from (2)