Non-zero θ13\theta_{13} and CP violation in a model with A4A_4 flavor symmetry

Motivated by recent observations of non-zero $\theta_{13}$ from the Daya Bay and RENO experiments, we propose a renormalizable neutrino model with $A_4$ discrete symmetry accounting for deviations from the tri-bimaximal mixing pattern of neutrino mixing matrix indicated by neutrino oscillation data. In the model, the light neutrino masses can be generated by radiative corrections, and we show how the light neutrino mass matrix can be diagonalized by the Pontecorvo-Maki-Nakagawa-Sakata mixing matrix whose entries are determined by the current neutrino data including the Daya Bay result. We show that the origin of the deviations from the TBM mixing is non-degeneracy of the neutrino Yukawa coupling constants, and unremovable CP phases in the neutrino Yukawa matrix give rise to both low energy CP violation measurable from neutrino oscillation and high energy CP violation.Comment: Two figures are added more (24 pages, 13 figures). Version to appear in Physical Review

A direct link between neutrinoless double beta decay and leptogenesis in a seesaw model with S4S_4 symmetry

We study how leptogenesis can be implemented in a seesaw model with $S_4$ flavor symmetry, which leads to the neutrino tri-bimaximal mixing matrix and degenerate right-handed (RH) neutrino spectrum. Introducing a tiny soft $S_4$ symmetry breaking term in the RH neutrino mass matrix, we show that the flavored resonant leptogenesis can be successfully realized, which can lower the seesaw scale much so as to make it possible to probe in colliders. Even though such a tiny soft breaking term is essential for leptogenesis, it does not significantly affect the low energy observables. We also investigate how the effective light neutrino mass $| |$ associated with neutrinoless double beta decay can be predicted along with the neutrino mass hierarchies by imposing experimental data of low-energy observables. We find a direct link between leptogenesis and neutrinoless double beta decay characterized by $||$ through a high energy CP phase $\phi$, which is correlated with low energy Majorana CP phases. It is shown that our predictions of $||$ for some fixed parameters of high energy physics can be constrained by the current observation of baryon asymmetry.Comment: 9 pages, 6 figures, references added, accepted in Phy.Rev.

Peningkatan Keterampilan Proses Sains Pada Pembelajaran Biologi Melalui Penerapan Model Bounded Inquiry Lab Pada Peserta Didik Kelas XI MIA 3 SMA Al Islam 1 Surakarta

ABSTRAK Sin Syin Lu’Lu’ Handayani. K4311067. PENINGKATAN KETERAMPILAN PROSES SAINS PADA PEMBELAJARAN BIOLOGI MELALUI PENERAPAN MODEL BOUNDED INQUIRY LAB PADA PESERTA DIDIK KELAS XI MIA 3 SMA AL ISLAM 1 SURAKARTA. Skripsi. Surakarta: Pendidikan Biologi. Fakultas Keguruan dan Ilmu Pendidikan. Universitas Sebelas Maret Surakarta, Desember, 2015. Tujuan penelitian ini adalah untuk meningkatkan keterampilan proses sains yang meliputi empat aspek: 1) merumuskan masalah; 2) merumuskan hipotesis; 3) merencanakan percobaan; 4) menerapkan konsep, pada pokok bahasan Sistem Indera melalui penerapan model bounded inquiry lab peserta didik kelas XI MIA 3 SMA Al Islam 1 Surakarta Tahun Pelajaran 2014/2015. Penelitian ini merupakan penelitian tindakan kelas (PTK) yang berlangsung dalam dua siklus. Target penelitian tercapai yaitu terjadi peningkatan sebesar 20% pada setiap aspek keterampilan proses sains. Setiap siklus terdiri dari empat tahapan, yaitu perencanaan, pelaksanaan, observasi, dan refleksi. Subjek penelitian adalah peserta didik kelas XI MIA 3 SMA AL Islam 1 Surakarta Tahun Pelajaran 2014/2015 yang berjumlah 35. Pengumpulan data menggunakan: 1) teknik non tes (observasi, wawancara dan dokumentasi); 2) teknik tes berupa tes keterampilan proses sains. Data dianalisis secara deskriptif kualitatif. Validasi data menggunakan teknik triangulasi. Hasil penelitian menunjukkan terjadi peningkatan setiap aspek keterampilan proses sains pada Pratindakan , Siklus I dan Siklus II secara berurutan yaitu: 1) merumuskan masalah (39,46%; 50%; 82,35%); 2) merumuskan hipotesis (34,05%; 49,12%; 81,48%); 3) merencanakan percobaan (20,54%; 40,59%; 71,37%); 4) menerapkan konsep (36,76%; 38%; 64,75%). Berdasarkan hasil tersebut dapat disimpulkan bahwa ada peningkatan keterampilan proses sains pada pembelajaran Biologi melalui penerapan model bounded inquiry lab peserta didik kelas XI MIA 3 SMA Al Islam 1 Surakarta Tahun Pelajaran 2014/2015. Kata Kunci: model bounded inquiry lab, keterampilan proses sain

Comments on Baryon Melting in Quark Gluon Plasma with Gluon Condensation

We consider a black hole solution with a non-trivial dilaton from IIB super gravity which is expected to describe a strongly coupled hot gauge plasma with non-vanishing gluon condensation present. We construct a rotating and moving baryon to probe the screening and phases of the plasma. Melting of the baryons in hot plasma in this background had been studied previously, however, we show that baryons melt much lower temperature than has been suggested previously.Comment: 3 figures, 12 page