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《Physics letters. [Part B]》2006,643(6):336-341
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Yin Lin 《Nuclear Physics B》2010,824(1-2):95-110
It is a common believe that, if the tri-bimaximal mixing (TBM) pattern is explained by vacuum alignment in an model, only a very small reactor angle, say being the Cabibbo angle, can be accommodated. This statement is based on the assumption that all the flavon fields acquire VEVs at a very similar scale and the departures from exact TBM arise at the same perturbation level. From the experimental point of view, however, a relatively large value is not yet excluded by present data. In this paper, we propose a seesaw model in which the previous assumption can naturally be evaded. The aim is to describe a without conflicting with the TBM prediction for which is rather close to the observed value (at level). In our model the deviation of the atmospherical angle from maximal is subject to the sum-rule: which is a next-to-leading order prediction of our model. 相似文献
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《Physics letters. [Part B]》2006,632(5-6):740-744
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《Physics letters. [Part B]》2006,632(2-3):277-281
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How well can we manipulate the state of a particle via a discrete-time quantum walk? We show that the discrete-time quantum walk on a one-dimensional infinite chain with coin operators that are independent of the position can only realize product operators of the form , which cannot change the position state of the walker. We present a scheme to construct all possible realizations of all the product operators of the form . When the coin operators are dependent on the position, we show that the translation operators on the position can not be realized via a DTQW with coin operators that are either the identity operator or the Pauli operator . 相似文献
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