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R are E ta D ecays with a T pc for O ptical P hotons Corrado Gatto - PowerPoint PPT Presentation

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R are E ta D ecays with a T pc for O ptical P hotons Corrado Gatto INFN Napoli and Northern Illinois University For the REDTOP Collaboration 6/11/2019 C. Gatto - INFN & NIU 1 SM is showing its age SM matter: Dark matter:Dark

  1. R are E ta D ecays with a T pc for O ptical P hotons Corrado Gatto INFN Napoli and Northern Illinois University For the REDTOP Collaboration 6/11/2019 C. Gatto - INFN & NIU 1

  2. SM is showing its age  SM matter: Dark matter:Dark energy=5%:25%:70%  Baryon Asymmetry of the Universe  Expansion of the universe is accelerating (hint to more forces)  . . . .  New physics is elusive: probability of processes where new physics is coupled to SM  physics is low LHC found no hint of new physics at high energy so far  New physics could be at much lower energy  Colliders have insufficient luminosity ( O (10 41 ) cm -2 vs O (10 44 ) cm -2 for 1 – mm fixed target )  Newest theoretical models prefer gauge bosons in MeV-GeV mass range as “…many  of the more severe astrophysical and cosmological constraints that apply to lighter states are weakened or eliminated, while those from high energy colliders are often inapplicable” (B. Batell , M. Pospelov, A. Ritz – 2009) High intensity-low energy experiments are growing in popularity (Fixed target and beam dump) 6/11/2019 C. Gatto - INFN & NIU 2

  3. It is a Goldstone boson  Symmetry constrains its QCD dynamics It can be used to test C and CP It is an eigenstate of the C, P, CP and G  operators (very rare in nature): I G J PC =0 + 0 -+ invariance. Its decays are not influenced by a change All its additive quantum numbers are zero  of flavor (as in K decays) and violations Q = I = j = S = B = L = 0 are “pure” All its possible strong decays are forbidden in  It is a very narrow state ( G h =1.3 KeV vs lowest order by P and CP invariance, G-parity G r =149 MeV) conservation and isospin and charge symmetry invariance. Contributions from higher orders are enhanced by a factor of ~100,000 EM decays are forbidden in lowest order by C  invariance and angular momentum Excellent for testing invariances conservation Decays are free of SM backgrounds for The η decays are flavor -conserving reactions  new physics search h is an excellent laboratory to search for physics Beyond Standard Model 6/11/2019 C. Gatto - INFN & NIU 3

  4. Assume a yield ~10 13 h mesons/yr and ~10 11 h ’ mesons/ yr C, T, CP-violation New particles and forces searches ❑ CP Violation via Dalitz plot mirror asymmetry: h → p o p + p - ❑ Scalar mesonsearches (charged channel): h → p o H with ❑ CP Violation (Type I – P and T odd , C even): h-> 4p o → 8g H→ e + e - and H→ m + m - ❑ CP Violation (Type II - C and T odd , P even): h → p o l + l and h → ❑ Dark photon searches: h → g A ’ with A ’ → l + l - 3g ❑ Protophobic fifth force searches : h → g X 17 with X 17 → e + e - ❑ Test of CP invariance via m longitudinal polarization: h → m + m – ❑ New leptophobicbaryonic force searches : h → g B with B→ e + e - ❑ Test of CP invariance via g* polarization studies: h → p + p – e + e – or B→ g p o and h → p + p – m + m – ❑ Indirect searches for dark photons new gauge bosons and ❑ Test of CP invariance in angular correlation studies: h → m + m – e + e – leptoquark: h → m + m - and h → e + e - ❑ Test of T invariance via m transverse polarization: h → p o m + m – and ❑ Search for true muonium: h → g(m + m – )| 2M m → g e + e – h → g m + m – ❑ CPT violation: m polariz. in h → p + m - n vs h → p - m + n and g polarization in h → g g Other discrete symmetry violations Other Precision Physics measurements ❑ Lepton Flavor Violation: h → m + e – + c.c. ❑ Proton radius anomaly: h → g m + m – vs h → g e + e - ❑ Double lepton Flavor Violation: h → m + m + e – e – + c.c. ❑ All unseen leptonic decay mode of h / h ‘ (SM predicts 10 -6 -10 -9 ) Non- h/h ’ based BSM Physics High precision studies on medium energy physics ❑ Nuclear models ❑ Dark photon and ALP searches in Drell-Yan processes: qqbar → A ’/a → l + l – ❑ Chiral perturbation theory ❑ ALP’s searches in Primakoff processes: p Z → p Z a → l + l – ❑ Non-perturbative QCD (F. Kahlhoefer) ❑ Charged pion and kaon decays: p + → m + n A ’ → m + n e + e – and ❑ Isospin breaking due to the u-d quark mass difference K + → m + n A ’ → m + n e + e – ❑ Octet-singlet mixing angle ❑ Neutral pion decay: p o → g A ’ → g e + e – ❑ Electromagnetic transition form-factors (important input for g-2) 6/11/2019 C. Gatto - INFN & NIU 4

  5. h → g A ’ with A’ → m + m - and e + e - Studied within the “Physics Beyond Collider” program at CERN for 10 17 POT ❑ FNAL and BNL can provide 10x more POT ❑ Only “bump hunt analysis”. Adding vertexing improve the sensitivity to ❑ physics BSM by 10x (K. Maamary summer project) REDTOP@CERN 6/11/2019 C. Gatto - INFN & NIU 5 5

  6. h → p o H with H → m + m - and e + e - Viable DM candidate (in certain circumstances) coupling to Higgs portal - M. Pospelov, ❑ A. Ritz and M. Voloshin, Phys. Rev. D 78, 115012 (2008) Studied within the “Physics Beyond Collider” program at CERN for 10 17 POT ❑ FNAL and BNL can provide 10x more POT ❑ Only “bump hunt analysis”. Adding vertexing improve the sensitivity to physics BSM by ❑ 1000x (K. Maamary summer project) REDTOP@CERN 6/11/2019 C. Gatto - INFN & NIU 6

  7. h → p o p o a and h → p + p - a with a → m + m - and e + e - Studied within the “Physics Beyond Collider” program at CERN for 10 17 POT ❑ FNAL and BNL can provide 10x more POT ❑ Only “bump hunt analysis”. Will add vertexing to the analysis. ❑ REDTOP@CERN 6/11/2019 C. Gatto - INFN & NIU 7

  8. Beam emitted ALP’s from the following processes: ❑ ❑ Drell-Yan processes: qqbar → A ’/a → l + l – ❑ Proton bremsstrahlung processes: p N → p N A ’/a with A ’/a → l + l – (J. Blümlein and J. Brunner) ❑ Primakoff processes: p Z → p Z a → l + l – – (F. Kahlhoefer, et. Al.) Studied within the “Physics Beyond Collider” program at CERN for 10 17 POT ❑ FNAL and BNL can provide 10x more POT ❑ Only “bump hunt analysis”. Will add vertexing to the analysis. ❑ Redtop@PIP-II will provide x100 sensitivity (ALPACA study). ❑ REDTOP@CERN 6/11/2019 C. Gatto - INFN & NIU 8

  9. CP-violation from this process is not bounded by EDM as is the case for ❑ the η → 4π process. Complementary to EDM searches even in the case of T and P odd observables, ❑ since the flavor structure of the eta is different from the nucleus Current PDG limits consistent with no asymmetry ❑ REDTOP will collect 4x10 11 such decay (factor 100 in stat. error) ❑ New model in GenieHad (collaboration with S. Gardner & J. Shi – UK) based on ❑ https://arxiv.org/abs/1903.11617 6/11/2019 C. Gatto - INFN & NIU 9

  10. Technique η → 3 p o η → e + e - g Total η p -- p→ h n 9  10 5 CB@AGS 10 7 g - p→ h p 1.8  10 6 2  10 7 CB@MAMI-B 5000 g - p→ h p 6  10 6 6  10 7 CB@MAMI-C e+e- → F → hg 6.5  10 5 5  10 7 KLOE >10 9 (untagged) pp→ h pp WASA@COSY 3  10 7 (tagged) pd→ h 3 He g - p→ h p 3  10 7 1.5  10 5 3  10 8 CB@MAMI 10 wk (proposed 2014) d Au→ h X 5  10 9 Phenix pp→ h pp 4.5  10 8 Hades p Au→ h X Near future samples g 12 GeV p → η X 5.5  10 7 /yr GlueX@JLAB (just started) → neutrals 3.9  10 5 /day JEF@JLAB g 12 GeV p → η X (recently approved) → neutrals 2.5  10 13 /yr REDTOP@FNAL p 1.8 GeV Be → η X (proposing) 6/11/2019 C. Gatto - INFN & NIU 10

  11. Medium energy proton beam 1.5 – 4 GeV ▪ 10 17 POT/yr (10 18 POT/yr better-FNAL and BNL) ▪ Produce ~ 10 13 h mesons/yr – reco eff > 10% ▪ Produce ~10 11 h ’ mesons/ yr – reco eff > 10% ▪ Efficient detection of the leptonic decays of the h ▪ Blind to protons and low energy charged pions. ▪ -near 4 p detector acceptance. ▪ 6/11/2019 C. Gatto - INFN & NIU 11

  12. Incident proton energy ~1.8 GeV (3.5 GeV for h ’) ❑ CW beam, 10 17 -10 18 POT/yr (depending on the host laboratory) ❑ h/h ‘ hadro-production from inelastic scattering of protons on Li or Be targets (vs ❑ Nb as Hades-like experiments) Use multiple thin targets to minimize combinatorics background ❑ g detection charged tracks detection Use Cerenkov effect for tracking Use ADRIANO calorimeter for ❑ ❑ charged particles reconstructing EM showers s E /E < 5%/  E Baryons and most pions are below Č ❑ ❑ threshold PID from dual-readout to disentangle ❑ Electrons and most muons are showers from g / m /hadrons ❑ detected and reconstructed in an 96.5% coverage ❑ Optical-TPC Fiber tracker (LHCB style) for rejection of background from g -conversion and ❑ reconstruction of secondary vertices (~70 m m resolution) 6/11/2019 C. Gatto - INFN & NIU 12

  13. ADRIANO2 Optical TPC Calorimeter (tiles) • ~ 1m x 1.5 m • Scint. + heavy glass CH 4 @ 1 Atm • sandwich 5x10 5 Sipm/Lappd • • 20 X 0 ( ~ 64 cm deep) 98% coverage • Triple-readout +PFA • • 96% coverage m -polarizer Active version (from 2.4 m TREK exp.) - optional 10x Be or Li targets 0.33 mm thin • • Spaced 10 cm 1.5 m 2.7 m 1 m Fiber tracker for rejection of g-conversion and vertexing Aerogel Dual refractive index system OTPC 6/11/2019 C. Gatto - INFN & NIU 13

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