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Oscar Sironi
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For almost 50 years the structure of the Lambda(1405) resonance has been a mystery. Even though it contains a heavy strange quark and has odd parity, its mass is lower than any other excited spin-1/2 baryon. Dalitz and co-workers speculated that it might be a molecular state of an antikaon bound to a nucleon. However, a standard quark-model structure is also admissible. Although the intervening years have seen considerable effort, there has been no convincing resolution. Here we present a new lattice QCD simulation showing that the strange magnetic form factor of the Lambda(1405) vanishes, signaling the formation of an antikaon-nucleon molecule. Together with a Hamiltonian effective-field-theory model analysis of the lattice QCD energy levels, this strongly suggests that the structure is dominated by a bound antikaon-nucleon component. This result clarifies that not all states occurring in nature can be described within a simple quark model framework and points to the existence of exotic molecular meson-nucleon bound states. src For almost 50 years the structure of the Lambda(1405) resonance has been a mystery. Even though it contains a heavy strange quark and has odd parity, its mass is lower than any other excited spin-1/2 baryon. Dalitz and co-workers speculated that it might be a molecular state of an antikaon bound to a nucleon. However, a standard quark-model structure is also admissible. Although the intervening years have seen considerable effort, there has been no convincing resolution. Here we present a new lattice QCD simulation showing that the strange magnetic form factor of the Lambda(1405) vanishes, signaling the formation of an antikaon-nucleon molecule. Together with a Hamiltonian effective-field-theory model analysis of the lattice QCD energy levels, this strongly suggests that the structure is dominated by a bound antikaon-nucleon component. This result clarifies that not all states occurring in nature can be described within a simple quark model framework and points to the existence of exotic molecular meson-nucleon bound states. https://arxiv.org/abs/1411.3402

Quando si edita un file in un sistema unix, è sempre meglio fare un backup del file sul momento on the fly, di modo che, se si fa qualche cazzata, si può facilmente recuperare.

Per non stare a riscrivere tutto il percorso del file 2 volte, che può essere tedioso, si può fare ad esempio:

:~$ cp /etc/openvpn/server.conf{ , bkp}


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Need advice how to get the Lama Epic Building. In 24 hours i can barely get to 20/30 points, let not even talk about 80. I tried with the beach spec, where I have about 20/25 building but it's the same. It starts asking 5 cement, or 4 beef, 3 icecreams, 5 sofa. wtf, it takes 3 hours just to make one, and takes also ages to find the items on the store.

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Oscar Sironi commented on a post on Blogger.
+Marina Mele Grazie mille.  ieri ho fatto il tutorial Djangogirls, oggi il tuo, sto imparando django tutto al femminile :-)

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Ho ottenuto 250 monete in Gira e vinci su 8 Ball Pool!

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Questo sito serve ad accorciare i link troppo lunghi per renderli più "gestibili". Tutti i ricavati provenienti dai banner verranno devoluti in beneficenza per i cagnolini bisognosi

http://tuolink.it

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