Precision RENORM / MBR Predictions for Diffraction at LHC Konstantin Goulianos Precision predictions ? Wow! 1

Basic and combined diffractive processes CONTENTS Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 2MIAMI 2015  Diffraction  SD1 p 1 p 2  p 1 +gap+X 2 Single Diffraction / Dissociation –1  SD2p 1 p 2  X 1 +gap+p 2 Single Diffraction / Dissociation - 2  DDp 1 p 2  X 1 +gap+X 2 Double Diffraction / Double Dissociation  CD/DPEp 1 p 2  gap+X+gap Central Diffraction / Double Pomeron Exchange  Renormalization  Unitarization  RENORM Model  Triple-Pomeron Coupling: unambiguously determined  Total Cross Section:  Unique prediction based on saturation and a tensor glue ball approach  References  Previous talks:  LHCFPWG 2015 Madrid (21-25 Apr 2015)  EDS BLOIS 2015 Borgo, Corsica, France 29 Jun-4 Jul,  MBR MC Simulation in PYTHIA8, KG & R. Ciesielski,

Basic and combined diffractive processes RENORM: Basic and Combined Diffractive Processes 4-gap diffractive process-Snowmass gap SD DD Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 3MIAMI 2015 BASIC COMBINED particles DD SD Cross sections analytically expressed in arXiv below: rapidity distributions

KG-PLB 358, 379 (1995) Regge Theory: Values of s o & g PPP ? Parameters:  s 0, s 0 ' and g(t)  set s 0 ' = s 0 (universal Pomeron)  determine s 0 and g PPP – how?  (t)=  (0)+  ′t  (0)=1+  Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 4MIAMI

A complicatiion…  Unitarity! Theoretical Complication: Unitarity!   sd grows faster than  t as s increases *  unitarity violation at high s (also true for partial x-sections in impact parameter space)  the unitarity limit is already reached at √s ~ 2 TeV !  need unitarization * similarly for (d  el /dt) t=0 w.r.t.  t  but this is handled differently in RENORM RENORM predictions for diffraction at LHC confirmed Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 5MIAMI 2015

Factor of ~8 (~5) suppression at √s = 1800 (540) GeV Diffractive x-section suppressed relative to Regge prediction as √s increases KG, PLB 358, 379 (1995) 1800 GeV 540 GeV M ,t,t p p p’ √s=22 GeV RENORMALIZATION Regge FACTORIZATION BREAKING IN SOFT DIFFRACTION CDFCDF Interpret flux as gap formation probability that saturates when it reaches unity Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 6MIAMI

Gap probability  (re)normalize it to unity Single Diffraction Renormalized independent variables: t color factor gap probability sub-energy x-section KG  CORFU-2001: Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 7MIAMI 2015

Single Diffraction Renormalized - 2 color factor Experimentally: KG&JM, PRD 59 (114017) 1999 QCD: Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 8MIAMI 2015

Single Diffraction Renormalized - 3 set to unity  determines s o Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 9MIAMI 2015

M2 distribution: data M 2 - Distribution: Data KG&JM, PRD 59 (1999)  factorization breaks down to ensure M 2 scaling Regge 1  d  dM 2 | t=-0.05 ~ independent of s over 6 orders of magnitude ! data Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 10MIAMI

Scale s 0 and PPP Coupling  Two free parameters: s o and g PPP  Obtain product g PPP s o  from  SD  Renormalized Pomeron flux determines s o  Get unique solution for g PPP Pomeron-proton x-section Pomeron flux: interpret it as gap probability  set to unity: determines g PPP and s 0 KG, PLB 358 (1995) 379 Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 11MIAMI

DD at CDF  Renor’d gap probabilityx-section Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 12MIAMI 2015  Regge x-section divided by integrated gap prob.

SDD at CDF  Excellent agreement between data and MBR (MinBiasRockefeller) MC Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 13MIAMI

CD/DPE at CDF  Excellent agreement between data and MBR based MC  Confirmation that both low and high mass x-sections are correctly implemented Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 14MIAMI

RENORM Difractive Cross Sections  1 =0.9,  2 =0.1, b 1 =4.6 GeV -2, b 2 =0.6 GeV -2, s′=s e -  y,  =0.17,  2 (0)=  0, s 0 =1 GeV 2,  0 =2.82 mb or 7.25 GeV -2 Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 15MIAMI 2015

Total, Elastic, and Inelastic x-Sections GeV 2 KG MORIOND  el p±p =  tot p±p ×(  el  tot ) p±p, with  el  tot from CMG  small extrapolation from 1.8 to 7 and up to 50 TeV CMG Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 16MIAMI

The total x-section √s F =22 GeV 98 ± 8 mb at 7 TeV 109 ±12 mb at 14 TeV Uncertainty is due to s 0 Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 17MIAMI

TOTEM (2012) vs PYTHIA8-MBR  inel 7 TeV = 72.9 ±1.5 mb  inel 8 TeV = 74.7 ±1.7 mb TOTEM, G. Latino talk at CERN 2012 MBR: 71.1±5 mb superball  ±1.2 mb RENORM: 72.3±1.2 mb RENORM: 71.1±1.2 mb Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 18MIAMI 2015 NBR errors reduced by 75% by using data on exclusive  ± production from the AFS at the ISR (  next slides)

ATLAS - in Diffraction 2014 (Talk by Marek Taševský, slide#19 Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 19MIAMI RENORM: 98.0±1.2 mb 19

Reduce Uncertainty in s 0 Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 20MIAMI 2015 Review of CEP by Albrow, Coughlin, Forshaw Fig. from Axial Field Spectrometer at the CERN Intersecting Storage Rings | Amplitude| 2 (arbitrary units) Data: Peter C. Cesil, AFS thesis (courtesy Mike Albrow)  analysis: S and D waves Conjecture: tensor glue ball (spin 2) Fit: Gaussian  =√s 0 =2.10±0.68 GeV  s 0 =4.42±0.34 GeV 2 20% increase in s o  x-sections decrease 2015

Reduced Uncertainty in s 0 EnergyTotalElasticInelasticMBR Exp 7 TeV95.4± ± ±1.0MBR 98.4± ±3.4TOTEM 95.35± ± ±0.90ATLAS CMS 8 TeV97.1± ± ±1.0MBR 101.7± ± ±1.7TOTEM 73. 1±0.9±0.9syst±3.3extr (this conference) ATLAS CMS 13 TeV103.7± ± ±1.3MBR MIAMI 2015 Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 21

The CMS Detector Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 22MIAMI 2015 CASTOR forward calorimeter: important for separating SD from DD contributions DD SD ND CD

CMS Data vs MC Models (2015)-1 Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 23MIAMI 2015 SD dominated dataDD dominated data  Error bars are dominated by systematics  DD data scaled downward by 15% (within MBR and CDF data errors) PYTHIA8-MBR is the only model that describes well both the SD and DD data

CMS Data vs MC Models (2015) -2 Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 24MIAMI 2015 Central  -gap x-sections (DD dominated)  P8-MBR provides the best fit to the data  All other models too low at small 

SD Extrapolation to  x ≤ 0.05 vs MC Model Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 25MIAMI 2015  P8-MBR describes the normalization and shape of the CMS data and is used to extrapolate to the unmeasured regions to obtain  SD for  <0.05

p T Distr’s of MCs vs Pythia8 Tuned to MBR  COLUMNS Mass Regions  Low5.5<MX<10 GeV  Med.32<MX<56 GeV  High176<MX<316 GeV  ROWS MC Models  PYTHIA8-MBR  PYTHIA8-4C  PYTHIA6-Z2*  PHOJET  QGSJET-II-03  QGSJET-04  EPOS-LHC  CONCLUSION  PYTHIA8-MBR agrees best with the reference model and is used by CMS in extrapolating to the unmeasured regions.  Pythia8 tuned to MBR Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 26MIAMI 2015

Charged Mult’s vs MC Model – 3 Mass Regions Pythia8 parameters tuned to reproduce multiplicities of modified gamma distribution (MGD) KG, PLB 193, 151 (1987 ) Mass Regions  Low5.5<MX<10 GeV  Med.32<MX<56 GeV  High176<MX<316 GeV Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 27MIAMI < p T < 1.4 GeV CERN ISR 52.6 GeV SppS 540 GeV - Diffractive data vs MGD CERN ISR & SppS w/MGD fit -

Pythia8-MBR Hadronization Tune 28 PYTHIA8 default  Pp (s) expected from Regge phenomenology for s 0 =1 GeV 2 and DL t-dependence. Red line:-best fit to multiplicity distributions. (in bins of Mx, fits to higher tails only, default pT spectra)  good description of low multiplicity tails R. Ciesielski, “Status of diffractive models”, CTEQ Workshop 2013 Diffraction: tune SigmaPomP Diffraction: QuarkNorm/Power parameter Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 28MIAMI 2015

SD and DD x-Sections vs Models Includes ND background Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 29MIAMI 2015 Single Diffraction Double Diffraction

CMS vs MC & ATLAS Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 30MIAMI 2015 Uncorrected Δη F distribution vs MCs Stable-particle x-sections for pT>200 MeV and |  |<4.7 compared to the ATLAS 2012 result similar result

Monte Carlo Algorithm - Nesting y'cy'c Profile of a pp Inelastic Collision  y‘ <  y' min hadronize  y′ >  y' min generate central gap repeat until  y' <  y' min ln s′ =  y′ evolve every cluster similarly gap no gap final state of MC w /no-gaps t gap t t t1t1 t2t2 Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 31MIAMI 2015

SUMMARY  Introduction  Review of RENORM predictions of diffractive physics  basic processes: SD1,SD2, DD, CD (DPE)  combined processes: multigap x-sections  ND  no diffractive gaps  this is the only final state to be tuned  Monte Carlo strategy for the LHC – “nesting”  Updated RENORM parameters  Good agreement with existing measurements  Predictions of cross sections at 13 TeV Thank you for your attention! Thanks to Robert A. Ciesielski, my collaborator in the PYTHIA8-MBR project Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 32MIAMI 2015

BACKUP Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 33MIAMI 2015

Saturation at Low Q 2 and Small-x figure from a talk by Edmond Iancu Precision RENORM/NBR Predictions for Diffraction at LHC K.Goulianos 34MIAMI 2015