<i>CP</i>violation in the seesaw model

Endoh, T.; Morozumi, Takuya; Onogi, Tetsuya; Purwanto, Agus

doi:10.1103/physrevd.64.013006

Cited by 35 publications

(32 citation statements)

References 12 publications

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“…Thus the three phases σ, β 1 and β 2 appearing in Y ∆ generate the lepton number asymmetry [6]. From our analysis in section 3, it is clear that the lepton asymmetry can be related to WB invariants.…”

Section: Cp Violation In Lepton Number Asymmetrymentioning

confidence: 85%

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A bridge between CP violation at low energies and leptogenesis

et al. 2001

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We discuss the possibility of relating the size and sign of the observed baryon asymmetry of the universe to CP violation observable at low energies, in a framework where the observed baryon asymmetry is produced by leptogenesis through the out of the equilibrium decay of heavy Majorana neutrinos. We identify the CP violating phases entering in leptogenesis as well as those relevant for CP violation at low energies in the minimal seesaw model. We show that although in general there is no relation between these two sets of phases, there are specific frameworks in which such a connection may be established and we give a specific grand unification inspired example where such a connection does exist. We construct weak-basis invariants related to CP violation responsible for leptogenesis, as well as those relevant for CP violation at low energies. * gbranco@thwgs.cern.ch and

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Section: Cp Violation In Lepton Number Asymmetrymentioning

confidence: 85%

“…[5] and for a special case in Ref. [6]. In this paper, we identify the CP violating phases both in an appropriately chosen weak-basis (WB) and in the mass eigenstate basis.…”

Section: Introductionmentioning

confidence: 99%

A bridge between CP violation at low energies and leptogenesis

et al. 2001

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“…Sudut fasa ini dapat menjadi sumber informasi bagi terjadinya alam semesta taksimetri saat ini, sebagai contoh [14]. Tanda dari m i terkait dengan paritas CP dari neutrino sedangkan massa fisis |m i | [15].…”

Section: Diskusi Dan Simpulanunclassified

Matriks Massa Neutrino Berat dari Model Seesaw

Purwanto

2006

JFA

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IntisariDengan asumsi simetri lepton-quark dan menggunakan data eksperimen osilasi neutrino, struktur matriks massa neutrino berat dikaji dalam beberapa kasus. Hasilnya adalah dua bentuk dominan. Pertama, bentuk diagonal yang terkait dengan skala unifikasi dan di atasnya. Kedua, bentuk off-diagonal yang terkait dengan skala antara. Mekanisme seesaw [2] merupakan mekanisme paling populer untuk membangkitkan massa kecil neutrino yakni dengan menambahkan neutrino singlet chiralitas kanan (righthanded) masif ν R ke dalam MS sektor lepton. Penambahan neutrino kanan ini memberi massa Dirac M D bagi neutrino dengan mekanisme yang sama dengan sektor quark. Dengan demikian kita harapkan massa M D mempunyai orde yang sama dengan massa fermion lainnya.Selain itu, penambahan ν R juga memungkinkan kita mempunyai suku massa Majorana, M N yaitu 1 2ν R M N ν c R dan nilainya tidak dibatasi oleh grup gauge dari MS. Artinya, kita mempunyai skala massa baru bagi teori diperluas yakni model seesaw ini. Inilah masalah pokok yang perlu difahami apakah skala baru ini terkait dengan fisika baru yakni grup gauge yang lebih besar dan pada energi berapa hal ini terjadi.Massa masif neutrino kanan M N memberi massa kecil neutrino M ν melalui mekanisme seesaw Di dalam artikel ini akan ditentukan matriks massa neutrino berat dan mengestimasi skala baru melalui kebalikan pers.(1)dengan menggunakan data eksperimen massa dan bauran (mixing) neutrino serta asumsi simetri quark-lepton.Di bagian II diuraikan matriks bauran sektor lepton, data massa dan sudut bauran dari osilasi neutrino matahari dan atmosfer. Bagian III membahas matriks massa neutrino berat dalam kasus hirarki normal,hirarki terbalik bagi massa Dirac neutrino dengan sudut bauran maksimal tunggal maupun bimaksimal. Akhirnya diberikan diskusi dan kesimpulan pada bagian IV.

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“…The right-handed Majorana mass term is SU (2) × U (1) invariant, consequently it can have a value much above the scale v of the electroweak symmetry breaking, thus leading to the seesaw mechanism. The number of independent CP violating phases was identified for this case [15] as being equal to n(n − 1) with n the number of generations. For three generations this number equals six.…”

Section: General Framework and Seesawmentioning

confidence: 99%

Neutrino Data, CP Violation, and Cosmological Implications

Rebelo¹

2004

Beyond the Desert 2003

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Abstract. Recent experimental data provides evidence for neutrino masses and leads to the possibility of leptonic mixing and CP violation. In this work special attention is dedicated to CP violation in the leptonic sector both at low and at high energies in the framework of seesaw with only three righthanded neutrinos added to the Lagrangean of the Standard Model. It is shown that leptogenesis is a possible and likely explanation for the observed baryon asymmetry of the universe. In this case neutrino masses are constrained yet CP violating phases at low energies can only be related to CP violation at high energies in the context of specific models.

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CPviolation in the seesaw model

Cited by 35 publications

References 12 publications

A bridge between CP violation at low energies and leptogenesis

A bridge between CP violation at low energies and leptogenesis

Matriks Massa Neutrino Berat dari Model Seesaw

Neutrino Data, CP Violation, and Cosmological Implications

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