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To: "M. Jennifer Markus" <mjen@uclink4.Berkeley.edu>
cc: murayama@lbl.gov
Subject: Re: How are you and Homework 
Reply-to: murayama@lbl.gov
In-reply-to: Your message of "Sat, 22 Nov 1997 20:56:39 PST."
             <2.2.16.19971122205705.1ab7a982@uclink4.Berkeley.edu> 
Date: Sun, 23 Nov 1997 04:20:54 -0800
From: Hitoshi Murayama <murayama@thsrv.lbl.gov>

> Hello!  How are you?  Are you back yet?  If not, are you at least getting a
> chance to visit friends, etc., and have a mini-vacation?  

I'm not back yet.  Indeed, I could have some chance see old friends.
On the other hand, our kids are getting clunky after a prolonged
stay.  I'm also tired of asking the American Embassy every day and wait
anxiously for every mail that arrives.  I really wish to get back as
soon as possible!

> I hope that I counted the hours right and that you'll get a chance to
> respond to this.  Regarding the homework and the differences between |K1>
> and |Ks>, and |K2> and |KL>:  I thought each of the states in the two pairs
> were equivalent to each other, am I missing something?

It is OK to approximate K1=KS, but it is important to keep the
difference between K2 and KL,

	|KL> = |K2> + \epsilon |K1> .

The assumption in the HW problem is that only K1 decays into two-pion
states (this is implicit in the sentence that the CP violation lies in
the small mixture of K1 in KL).  If CP were exact, K1=KS and K2=KL.
Because CP is violated, they are not.  

I hope this helps!

Hitoshi