Noncommuta5ve Black Holes at the LHC

Transcription

1 Noncommuta5ve Black Holes at the LHC Elena Villhauer Karl Schwartzschild Mee5ng /07/2017

2 Outline Hierarchy Problem Condi2ons for black hole Produc2on at the LHC Brief tour of results from searches for TeVscale gravity at the LHC Theory of Noncommuta2ve Black Holes Experimental approach to Noncommuta2ve Black Holes

3 Hierarchy Problem Four fundamental forces Force Rela2ve Strength Strong nuclear 1 Weak nuclear 10-5 Electromagne2c 1/137 Gravita2onal 6 x Fundamental Planck scale: GeV Solu5on: The existence of extra dimensions would lower the Planck scale and account for the discrepancy in gravity s rela2ve strength

4 Extra Dimensional Models in LHC BH Searches ADD model M 2 P ~ M * n+2 R n Large, flat extra dimensions Standard Model fields are confined to a 4-D brane Gravity alone propagates in bulk RS1 model M 2 P ~ M * 3 (1 e -2kL )/k Standard Model par2cles are confined to a 4-D brane One Extra Dimension Tiny, warped, compac2fied Lives in AdS space Figures from arxiv: (Kan2)

5 Black Hole Forma5on at the LHC Condi2ons: Fundamental Planck scale is lowered to the TeV scale via the existence of extra dimensions Hoop Conjecture Theory is sa2sfied Circumference = 2πR S b Center-of-mass energy of each parton > M * Mass is enclosed in a region with a circumference < 2πR S σ = πr S 2

6 Semiclassical Black Holes at the LHC Condi2on: M BH >> M P Semiclassical black holes are believed to be beyond the reach of the LHC Thermal: emit Hawking radia2on Signature: mostly high pt jets, should contain a lepton Modeled by Charybdis2, BlackMax, TRUENOIR, CATFISH

7 LHC Semi-classical BH Results ATLAS CMS Mul5jet Lepton + Jets arxiv: Charybdis2 arxiv: BlackMax Mul5jet Charybdis2 Mul5jets arxiv: Charybdis2

8 Quantum Black Holes Condi2on: M BH ~ M P Signature of quantum gravity Nonthermal Strong preference for two body decays Modeled by generator QBH as 2-body decay Signature: high pt

9 ATLAS LHC QBH Results CMS Photon + Jet arxiv: Dijet Mul5jet arxiv: arxiv: , QBH Dijet Model Observed Lower Limit (TeV) Expected Lower Limit (TeV) High-mass dilepton arxiv:

10 String Balls Highly excited string states that arise when weakly coupled string theory is embedded in the paradigm of ADD-type dimensions Signature of quantum gravity Planck mass M p and string mass scale M s : possibly ~ TeV with extra dimensions Signature: Lots of high pt jets, should also have lepton Signature is not very different from GR black holes Different cross sec2ons than GR black holes

11 LHC String Ball Results ATLAS Mul5jet CMS Mul5jet

12 Why extra dimensions have not yet been discovered at the LHC Extra dimensions do not exist :( Extra dimensions DO exist, but we need Higher energy to produce black holes Black holes have been produced at the LHC, but we have missed them Different signatures than those we have been searching for Produced at a very low rate Not properly understanding backgrounds

13 Start of Run II June 2015: Great Hope for BHs Figure from ATLAS Weekly Mee2ng

14 Second Stage of Run II Diminishing returns Cross sec5on ra5os 14 TeV / 13 TeV Figure from ATLAS Weekly Mee2ng

15 LHC Schedule 13 TeV 14 TeV Figure from ATLAS Weekly Mee2ng

16 What we need More ENERGY New magnet: can push energy up to 18 TeV Unlikely to happen in the immediate 2me frame Scheduled to jump to 14 TeV next year Luminosity increases do not provide the exponen2al increases in discovery poten2al that energy increases provide Failing that, Different signatures Different cross sec2ons

17 Noncommuta5ve Black Holes Very different experimental signatures than other LHC black hole searches Lots of rela2vely sos par2cles: stark contrast to high pt par2cles of other BH searches The result of incorpora2ng noncommuta2ve geometry into the paradigm of extra dimensions Forms an effec2ve theory to quantum gravity Creates a new mass threshold above the Planck scale New regime for new physics

18 Noncommuta5ve Black Holes Assumes commutator of space2me coordinates 0 where = NC mass scale = dimensional, frame-independent an2symmetric matrix with real and constant entries (generated due to background magne2c or electric type fields) = NC parameter arxiv:gr-qc/ v1 (Ansoldi, Nicolini, Smailagic, Spallucci)

19 Noncommuta5ve Black Holes in Higher Dimensions Effect of noncommuta2vity: smears mass distribu2ons A point mass, M, characterized by a δ-func2on distribu2on (Mδ) becomes a spherically symmetric, sta2c, Gaussian smeared mawer source where BH horizon size and are << compac2fica2on scale R c ~ arxiv:hep-ph/ (Tom Rizzo)

20 A nonsingular solu5on Effect of noncommuta2vity: noncommuta2ve coordinate fluctua2ons at short distance cause a regular desiwer vacuum to replace the curvature singularity at r = 0 arxiv:gr-qc/ v1 (Ansoldi, Nicolini, Smailagic, Spallucci)

21 2010 NC BH Study at 8 TeV Analysis of neutral, nonrota2ng noncommuta2ve BH model (arxiv: , Douglas Gingrich) Model based on arxiv:hep-ph/ (Tom Rizzo) Trigger level analysis only Rela2vely low transverse momentum spectrum blended into the QCB background; no further ac2on was undertaken and the analysis was stopped Search strategy must be revised

22 Noncommuta5ve vs. Commuta5ve BH Parton Cross Sec5on Proton Cross Sec5on Temperature Figures from arxiv: , Douglas Gingrich

23 NC BH HT and Invariant Mass Figures from arxiv: , Douglas Gingrich

24 NC BH Jet Mul5plicity and leadinglepton pt Figures from arxiv: , Douglas Gingrich

25 NC BH Before Cuts Figures from arxiv: , Douglas Gingrich

26 NC BH A^er MET/sqrt(HT) Cuts Figures from arxiv: , Douglas Gingrich

27 Ini5al Black Hole Characteris5cs Figures from arxiv: , Douglas Gingrich

28 Remnant Characteris5cs Figures from arxiv: , Douglas Gingrich

29 Event Characteris5cs Figures from arxiv: , Douglas Gingrich

30 Par5cle Characteris5cs Figures from arxiv: , Douglas Gingrich

31 Cross sec5ons for various Figures from arxiv: , Douglas Gingrich

32 My Intended NC Black Hole Search Charged, rota2ng NC BH model in ADD-type extra dimensions using Charybdis2 generator Improvement from neutral, nonrota2ng BH model used in 2010 Trigger-level analysis Rota2on plays a huge role in accurate modeling, charge contributes as well Revise search strategy Figure out a way to separate the low pt signal from the QCD background Machine Learning, Deep Learning Noncommuta2ve black holes are predicted to decay to a stable remnant Search directly for the remnant Remnant characteris2cs: resembles those of corresponding BH Remnant Charge

33 Conclusion Public ATLAS and CMS results have not indicated any significant excessed in analyses using 13 TeV data Noncommuta2ve Black Holes offer a much different signature than any other TeV-scale gravity model in use Exci2ng search for a charge, nonrota2ng noncommuta2ve black holes in ADD-type extra dimensions using ATLAS data will be undertaken

34 THANK YOU