投影片 1 - tpd.ihep.cas.cn

投影片 1 - tpd.ihep.cas.cn

What Atomic Physics Can Do for Neutrino and Direct Dark Matter Detection? Jiunn-Wei Chen National Taiwan U. Collaborators: Chih-Liang Wu, Chih-Pang Wu (NTU) Chen-Pang Liu, Hsin-Chang Chih (NDHU) Keh-Ning Huang, Hao-Tse Shiao, Hao-Bin Li, Henry T. Wong, Lakhwinder Singh

(AS) Neutrino and Dark Matter are Portals to New Physics Neutrino: Challenges and Opportunities

Mass: hierarchy and absolute values Dirac or Majorana? CP phase(s)

Sterile neutrinos? Electromagnetic properties: magnetic moments? Charge Radius?... Those are probes of new physics! How neutrino magnetic moment arises in SM?

l i j W

W i j l

5 Neutrino Magnetic Moment (NMM) Flavor changing MM Dirac Majorana Flavor unchanging MM

(forbiden by CTP) m 10 B 1 eV 19

A probe of new physics! Dark Matter (DM) Bigger density than the visible Universe Its existence hints that there might be a dark sector Portals to the Dark Sector

Other dark matter candidates include MACHOs: MAssive Compact Halo Objects WIMPs: Weakly Interacting Massive Particles Why Atomic Physics? Energy scales: Atomic (~ eV) Reactor neutrino (~ MeV) WIMP (~ GeV) Neutrino: NNM atomic ionization signal larger at lower energy scattering (current Ge detector threshold 0.1 keV)

DM: direct detection, velocity slow (~ 1/1000), max energy 1 keV for mass 1 GeV DM. Opportunity: Applying atomic physics at keV (low for nuclear physics but high for atomic physics) Neutrino Atomic Ionization The complete set of neutrino electromagnetic form

factor is can be constrained: ee X e scattering Weak Interaction 2

2 me2

1 1 T E

g A 1 / 2 g v 2 sin w 1 / 2 Magnetic moment Should go for low T (energy transfered)!

Two Approximations ---I Equivalent Photon Approx. proposed by Henry Wong et al. ( PRL 105 061801) photon q2 0 : relativistic beam or soft photons q 0 several orders of magnitude enhancement tighen

the constraint with the same set of data Two Approximations --- II Free Electron Approx. revisited by Voloshin et al. ( PRL 105 201801) sum rule and Hydrogen-like calculation

FEA works well at sub-keV regime Toy: -H atomic ionization, exact result obtained (1307.2857) Toy: -H atomic ionization, exact result obtained (1307.2857)

Two Approximations Equivalent Photon Approx. Free Electron Approx. (revisited by Voloshin et.al)

binding momentum of hydrogen: mme Ge atomic ionization: ab initio MCRRPA Theory MCRRPA: multiconfiguration relativistic random phase approx. Hartree-Fock : Reducing the N-body problem to a 1-body problem by solving the 1-body effective potential self consistently.

RPA: Including 2 particle 2 hole excitations RRPA: Correcting the relativistic effect

MCRRPA: More than one configurations in Hartree-Fock; Important for open shell system like Ge where the energy gap is smaller than the closed shell case

18 MCRRPA Theory N-electron relativistic Hamiltonian H (t ) H V (t ) Dirac Hamiltonian +

Coulomb interaction Solve initial wavefucntion of atom The rest of EM interaction

Solve final wavefunction by time evolution Benchmark: Ge Photoionization Exp. data: Ge solid Theory: Ge atom (gas) Above 100 eV error under 5%.

JWC et. al. arXiv: 1311.5294 Ge atomic ionization with ab initio MCRRPA Theory JWC et. al.

arXiv: 1311.5294 Ge atomic ionization with ab initio MCRRPA Theory JWC et. al. arXiv: 1311.5294

Ge atomic ionization with ab initio MCRRPA Theory JWC et. al. 1411.0574 JWC et. al. arXiv: 1411.0574

Direct Dark Matter Detection RPP 2014 What Can Atomic Physics Contribute? Light dark matter detection:

Electron recoil background from solar neutrinos for a LXe detector Large LXe detectors can be used as a neutrino/axion detectors as well (measuring NNM w/ a source nearby) Electron Recoil Background for DARWIN (Lxe) L. Baudis et al 1309.7024

Summary Neutrinos and dark matter particles are portals to new physics Ab initio calculations of Ge neutrino atomic ionization performed with 5-10% estimated error. Xe can be done as well. Ongoing: dark matter atomic ionization

Searching for the QCD Critical End Point Jiunn-Wei Chen National Taiwan U. JWC, Jian Deng, Lance Labun 1410.5454

Universality In the scaling region, physics is the same within the same universality class---an effective field theory argument. QCD near CEP ~ Ising model (Stephanov)

CPOD 2014 4th moment CPOD 2014 3rd moment

When the Imaginary is a Real Alternative Jiunn-Wei Chen National Taiwan U. Phys.Rev.Lett. 110 (2013) 262301 Collaborators: Jens Braun, Jian Deng, Joaquin E. Drut, Bengt Friman, Chen-Te Ma, Yu-Dai Tsai

From the hottest to the coolest, and back? When Mr. Berry Meets Mr. Wigner Jiunn-Wei Chen National Taiwan U. JWC, Shi Pu, Qun Wang, Xin-Nian Wang

Phys.Rev.Lett. 110 (2013) 262301 Flavor Structure of the Nucleon Sea from Lattice QCD Jiunn-Wei Chen National Taiwan U. arXiv:1402.1462 [hep-ph] Collaborators: Huey-Wen Lin, Saul

D. Cohen, Xiangdong Ji Backup slides Solar Neutrino Flux Case study: NMM Reactor antineutrino ( e e )

e 2.9 10 11 B GEMMA : Ge detector with threshold 1.5keV e 7.4 10 11 B TEXONO: Ge detector with threshold 5keV Solar neutrino 5.4 10 11 B Borexino

Astrophysical limit (model dependent) from 10 11 to 10 13 B 40 ee X e scattering

e e Weak Interaction Magnetic moment 41

How low is low enough? 10 10 B e

Now sub-keV Ge detector is available! Parton Physics on a Euclidean Lattice X. Ji, PRL, 2013 Schematic QCD Phase Diagram

The location of the critical point (CEP)is still unknown. Th: Difficult to apply LQCD to the low T / high chemical potential region. Our Contribution JWC, Jian Deng, Lance Labun,1410.5454 Work out the mapping in a simple model: 1+1dim Gross-Neveu model in the large N

limit. Not in the same universality class--different critical exponents but behavior similar. More diagrams not included are also important in the power counting:

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