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RE: CP violation
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LHCb experiment observes new matter-antimatter difference

The LHCb collaboration at CERN today submitted a paper to Physical Review Letters on the first observation of matter-antimatter asymmetry in the decays of the particle known as the B°s. It is only the fourth subatomic particle known to exhibit such behaviour.
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Blobrana


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Matter antimatter asymmetry in three-body charmless B decays becomes more and more interesting.

Earlier this year, LHCb physicists reported at the ICHEP2012 the first evidence of inclusive CP asymmetry (differences between properties of matter and antimatter) in the charmless three-body B meson decays B± -> K±pi+pi- and B± -> K±K+K- in which the b-quark decays into a u,d or s-quark instead of its dominant decay into a charm c-quark.
These measurements have now, at the 7th International Workshop on the CKM Unitarity Triangle, Cincinnati, Ohio, USA, been complemented with results from the rarer B± -> pi±pi+pi- and B± -> pi±K+K- decays, finding evidence of even larger CP violation.
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Title: Measurement of the difference of CP--violating asymmetries in D^0 -> K^+K^- and D^0 ->pi^+pi^- decays at CDF
Authors: CDF Collaboration

We report a measurement of the difference (Delta\Acp) between time-integrated CP--violating asymmetries in D^0-> K^+ K^- and D^0-> \pi^+\pi^- decays reconstructed in the full data set collected by the Collider Detector at Fermilab, corresponding to 9.7 fb^{-1} of integrated luminosity. The strong decay D^{*+}->D^0 pi^+ is used to identify the charm meson at production as D^0 or \bar{D}^0. We measure Delta\Acp = [-0.62 ± 0.21 (stat) ± 0.10 (syst)] %, which differs from zero by 2.7 Gaussian standard deviations. This result strongly supports similar evidence for CP violation in charm-quark decays obtained in pp collisions.

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Blobrana


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Kaon decay
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Supercomputing the Difference between Matter and Antimatter

An international collaboration of scientists has reported a landmark calculation of the decay process of a kaon into two pions, using breakthrough techniques on some of the world's fastest supercomputers. This is the same subatomic particle decay explored in a 1964 Nobel Prize-winning experiment performed at the U.S. Department of Energy's Brookhaven National Laboratory (BNL), which revealed the first experimental evidence of charge-parity (CP) violation - a lack of symmetry between particles and their corresponding antiparticles that may hold the answer to the question "Why are we made of matter and not antimatter?"
The new research - reported online in Physical Review Letters March 30, 2012 - helps nail down the exact process of kaon decay, and is also inspiring the development of a new generation of supercomputers that will allow the next step in this research.
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Blobrana


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Galaxy sized twist in time pulls violating particles back into line

A University of Warwick physicist has produced a galaxy sized solution which explains one of the outstanding puzzles of particle physics, while leaving the door open to the related conundrum of why different amounts of matter and antimatter seem to have survived the birth of our Universe.
Physicists would like a neat universe where the laws of physics are so universal that every particle and its antiparticle behave in the same way. However in recent years experimental observations of particles known as Kaons and B Mesons have revealed significant differences in how their matter and anti matter versions decay. This "Charge Parity violation" or "CP violation" is an awkward anomaly for some researchers but is a useful phenomenon for others as it may open up a way of explaining why more matter than anti matter appears to have survived the birth of our universe.
However Dr Mark Hadley, of the Department of Physics at the University of Warwick, believes he has found a testable explanation for apparent Charge Parity violation that preserves parity but also makes the Charge Parity violation an even more plausible explanation for the split between matter and antimatter.
Dr Hadley's paper (just published in EPL (Europhysics Letters) and entitled "The asymmetric Kerr metric as a source of CP violation") suggests that researchers have neglected the significant impact of the rotation of our Galaxy on the pattern of how sub atomic particles breakdown.

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Blobrana


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Title: The asymmetric Kerr metric as a source of CP violation

Authors: Mark J Hadley

All experimental evidence for violation of discrete spacetime symmetries: Parity and Time reversal and the related Charge conjugation/Parity combination (P, T and CP respectively) has been obtained on earth in a gravitational potential that is P and T anisotropic. It is suggested that the origin of the observed CP violation is the scalar field equal to the frame dragging term d\phi dt in the Kerr metric of a spinning massive body. The galaxy would be the largest such source. Indirect evidence of such an effect would be anisotropic decay products when plotted in a reference frame defined by the fixed stars. As a consequence, CP violation would be very much greater near compact astrophysical objects with large angular momentum.

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