Effective Field Theory for Nuclear Physics! Akshay Vaghani! Mississippi State University!
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1 Effective Field Theory for Nuclear Physics! Akshay Vaghani! Mississippi State University!
2 Overview! Introduction! Basic ideas of EFT! Basic Examples of EFT! Algorithm of EFT! Review NN scattering! NN scattering in Effective Field Theory!
3 ! Radiative neutron capture in C-14! Form factors of one nucleon halo C-15!
4 Introduction! Basic Building blocks of Nature - Quarks and Leptons! QCD and QED describes the dynamics of fundamental particles! Describe Low Energy Physics( Light Nuclei) with QCD is complicated,non perturbative, and infinite body problem.! Possible Solution! Lattice QCD! EFT!
5 Basic ideas of EFT! Dynamics at long distance do not depend on what happens at short distance! Low energy interactions do not care about details of high energy interactions! We don't need to understand Nuclear Physics to build a bridge!!!
6 EFT Concepts! EFT is a systematic approximation to some underlying dynamics, valid in specific regime! Phenomena at low energy (long wave length) can not probe detail of high energy (short distance) structure of Physics! Expand short distance physics in terms of contact interaction! Coefficients fit to low energy data!
7 Some Basic Examples!
8 Gravity for h < R! Gravitational potential energy,! h- Height above the Earth surface! R- Radius of the Earth! Theory is converge for h<r!
9 Multipole Expansion! Multipole expansion of electric potentials,! Sum converge for a << R! Low energy probes are sensitive to only bulk properties.!
10 EFT Algorithm! Identify low energy scale and high energy scale in the theory. (Ration of scales will form expansion parameter)! Identify the Symmetry of the theory! Power Counting! Write down Effective Lagrangian and interaction, consistent with the Symmetry! Calculate loops and renormalize them!
11 Nucleon-Nucleon Scattering at Low Energy! Potential Model with strong interaction! Asymptotic wave function and the cross section!
12 T-Matrix (scattering amplitude)! Effective Range Expansion,! a-scattering length! r0-effective range! P-shape parameter!
13 Leading ERE amplitude! Second order ERE amplitude! Analytical structure of T(k) must reproduce in Effective Field Theory!
14 EFT for Nucleon Nucleon Scattering! Build EFT to reproduce ERE Amplitude! Low energy Degree of freedom - Nucleon! Separation of Scale! k<< Mπ!
15 Symmetry- Translational invariance, rotational invariance! Non Relativistic-Nucleon Momentum k<<mπ!
16 Effective Lagrangian! P - projection operator for spin and isospin! n - number of space -time dimension! μ - arbitrary mass scale to regulate dimensions! - higher derivative operator for higher body interaction!
17 Feynman Diagrams! Sum Feynman diagrams which give the amplitude T to the desired order in k/λ expansion.!
18 Summing Feynman diagrams, scattering amplitude from our effective Lagrangian,! I0 - Momentum independent single loop integral! I 0 = i µ 2 4 n Z d n q (2 ) n E + q 0 i q 2 /2M +i q 0 i q 2 /2M +i here, Nucleon momentum,! This integral diverges and needs to be regularized and renormalized!
19 MS Subtraction scheme! Integral using MS subtraction scheme!
20 Power Divergence Subtraction(PDS)! new power counting! this allows for fine tuning between coefficient C and linear divergence.! μ is subtraction scale! PDS isolate linear divergence from integral!
21 ERE amplitude,! EFT amplitude,! Matching leading orders,! c0 depends on both a and meaning assigned to divergent part of I0! works with both channel!!
22 RADIATIVE NEUTRON CAPTURE ON CARBON-14!!
23 Motivation! 14 C (n,γ) 15 C is important in Astrophysics! Reaction is part of CNO cycle in helium burning stars! Fundamental reaction in Big Bang Nucleosynthesis for production of nuclei with mass number > 14! Theoretical method involved in radiative capture is important for future experimental efforts!
24 Radiative Nutron capture on Carbon-14! In EFT, short distance physics is not relevant at low energy! Ground state of 15 C has angular momentum J π = (½) +! Neutron separation energy MeV! Carbon-15 has a single Neutron halo bound to Carbon-145!
25 !!! Final state 15 C : S-wave! Incoming state n + 14 C : P-wave! Transition from P-wave to S-wave! Parity conservation - E1 (electric dipole transition) transition!
26 Formalism! EFT Lagrangian! Feynman diagrams and scattering amplitude! Cross section!
27 EFT Lagrangian for final S Channel! Auxiliary Field- C15 Field -! Neutron Field -! Carbon-14 Field - C! M=Mn+Mc!
28 EFT Lagrangian for P Channel! Here, projection operator,! Auxiliary field for p-channel -!
29 Feynman Diagrams! E1 Capture! Single dashed line - dimer field - p-wave interaction -! Double dashed linedimer field - final state of C15 -!
30 Scattering Amplitude! 2p1/2 -Channel! 2p3/2 -Channel!
31 Scattering Cross Section! Total cross section,! Depends on unknown EFT couplings that expressed in terms of ρ, a 1 and r 1!
32 Results! Parameterize EFT coupling! ERE parameters, a1 = -n 1 /(Q 3 ), r1 = 2n 2 Q! n 1, n 2 can estimate from coulomb dissociation and direct capture data!
33 Form factors of single neutron halo system ( C15 )! Halo nuclei play an important role in heavy element synthesis in nuclear astrophysics! Clear separation of energy scales! weakly bound valance nucleons and tightly bound core! Ideal to construct low energy EFT! Form factor is important to determine internal properties like charge density, size, magnetic properties!
34 Probe internal structure of C15! 15C - spin-1/2 single neutron halo! 14C-core and single valence neutron! Analyzed similar like electron scattering to Proton target!
35 Elastic scattering and matching parameter! EFT coupling relates with ERE parameter! Binding momentum! ρ - effective range!
36 EFT Calculation of Γ 0 Photon! Hadronic current - Electric Coupling!
37 EFT Calculation of Γ i Photon! Hadronic current - Magnetic coupling!
38 Electric Form factor and charge radius! determine charge radius entirely from binding energy!
39 Magnetic Form Factor and Magnetic Moment! Magnetic moment of halo nucleus,!
40 !! Conclusion! EFT describes experimental data consistently! More accurate measurements needed near the resonance energy to verify the interference effect of resonance and non-resonance! The form factor calculation of Carbon-15 will be useful for future form factor calculation of Beryllium 11(spin 1/2 halo)!
41 Thank you!
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