Abstract
We present a new method for detection of multiply charmed baryons via their decays into strange baryons, using ‘strangeness tracking’. This method makes use of the state-of-the-art upgraded silicon detectors in ALICE during Runs 3, 4 and beyond will enable the novel possibility of tracking strange hadrons directly before they decay, leading to a very significant improvement in impactparameter resolution. In this work, we will discuss how this new technique will be crucial to distinguish secondary strange baryons originating from charm decays from primary strange baryons. This is a particularly interesting possibility for the Ω− baryon coming from Ωc0 → Ω−π+ decays, since there is no other relevant feeddown source for Ω−. This, in turn, means that the main Ω− background for the Ωc measurement will point most accurately to the primary vertex, unlike pions or protons from other charm baryon decays. We will illustrate the achievable performance of strangeness tracking for the Run 3 configuration of ALICE with the upgraded Inner Tracking System, which is fully instrumented with silicon pixel detectors. Moreover, we will discuss the potential of this technique in a future experiment with an extensive silicon tracking detector with a first layer very close to the interaction point. Finally, we will also cover other potential major applications of strangeness tracking, including measurements of hypernuclei such as the Λ3H.
Highlights
A fundamental ingredient of the ALICE physics programme for the new decade is a comprehensive study of charm and multi-charm baryon production
We propose to overcome this difficulty using a novel reconstruction technique called ‘strangeness tracking’, which is made possible by the next-generation detectors of the experiment
The upgraded ALICE inner tracking system, the ITS2 [1], is ideal for a first implementation of such a method. This is because the ITS2 has an innermost silicon pixel layer at a radius of 22 mm, as opposed to 39 mm for the previous silicon pixel detectors
Summary
A fundamental ingredient of the ALICE physics programme for the new decade is a comprehensive study of charm and multi-charm baryon production. We propose to overcome this difficulty using a novel reconstruction technique called ‘strangeness tracking’, which is made possible by the next-generation detectors of the experiment In this method, we use high-resolution silicon detectors very close to the primary vertex to measure the hits of a weakly decaying hadron prior to its decay and combine them with the information from the decay daughters to significantly improve pointing resolution. We use high-resolution silicon detectors very close to the primary vertex to measure the hits of a weakly decaying hadron prior to its decay and combine them with the information from the decay daughters to significantly improve pointing resolution In this context, the upgraded ALICE inner tracking system, the ITS2 [1], is ideal for a first implementation of such a method.
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