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# Determine whether or not strangeness is conserved in the following decays and reactions.$$\text {(A)} \quad \Lambda^{0} \rightarrow \mathrm{p}+\pi^{-} \quad \text { (d) } \pi^{-}+\mathrm{p} \rightarrow \pi^{-}+\Sigma^{+}$$$$\text {(b)} \pi^{-}+p \rightarrow \Lambda^{0}+K^{0} \quad(e) \equiv \rightarrow \Lambda^{0}+\pi^{-}$$$$\text {(c)} \overline{\mathrm{p}}+\mathrm{p} \rightarrow \overline{\Lambda^{0}}+\Lambda^{0} \quad \text { (f) } \Xi^{0} \rightarrow \mathrm{p}+\pi^{-}$$

## a. not conservedb.conservedc.conservedd.not conservede. not conservedf.not conserved

Nuclear Physics

Particle Physics

### Discussion

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##### Andy C.

University of Michigan - Ann Arbor

LB
##### Aspen F.

University of Sheffield

##### Jared E.

University of Winnipeg

### Video Transcript

for this question were given the six directions and want to look at whether they called itself strangeness. And the basic way to do that is to look at the content off the vari ous uh, party goes. And if they contain a strange quirk, a strange quote will contribute a strangeness off minus one. You're a Clinton aide at nt Strange. This will contribute strangeness, video plus one. So the main idea is to know what are the various quite contents off the fulling particles and then looking at what hasty Strangis value right? Based on they are quite content. So for the first reaction left the London zero thank you contains a strange clock. So this will give us a stranger's off minus one. When you're inside, the proton has no strange clock. Keep eye on also has more strange. So that's true. So actually strangers is not conserved. Thanks. So it's not conserved. 40 first direction. No, let us move on the next one. We have pie on and proton again, which has supposed cereal strange clocks insight so that zero street value, the longer cereal once again has one strange clock, so that is minus one The Kailyn has an anti strange clock, so that has a value off plus one. So a total on the Ryans is Ciro as well. Like Toto is zero, and so strange is conserved. All right, moving on again. Proton antiproton. There's no strange quarks now, an anti longer zero that has a anti strange. So we have plus one. Sure, not that zero has a street squawk, so that's minus one. Total is zero Buddy Ryan site. So strange dances concerts for 1/4 direction. Pie on at Proton. Both have serial street clocks pion over on the right hand side at zero, but the signal plus has a street court, so it's a strange just off my last one. And so it is not conserved for these particle equation since D. Ryan's Isis minus one. What you have inside zero. Not for the fifth directions. The berry on over on the left in sight has actually to strange clocks, and this gives us a total strangeness very off minus two. Well, in the Ryan site, the pilot zero and the Lambda Zero Baron has when he minus one as it only one strange quirk, and so its strangeness value is only minus one. So it is not concert, right? Syrian Strange. This is conserved again. Way have to spare on we just too strange Clocks So total minus two. And the proton? Yes. No, strange Bayan has no strange quiet again. And once again, the strangers is not consist. So this is how you look for better the Clintons TheStreet shows various conserved or not for nuclear reactions. This will apply for him. Okay, in most cases, generally to other reactions as well.

National University of Singapore

#### Topics

Nuclear Physics

Particle Physics

##### Andy C.

University of Michigan - Ann Arbor

LB
##### Aspen F.

University of Sheffield

##### Jared E.

University of Winnipeg