Raycast does not work with touch input but works well with mouse input why?

Hello everyone,

I search but i can not find anything useful for my problem. Raycast doesn't work with touch input as i did at this code sample below.

 if(!EventSystem.current.IsPointerOverGameObject())
     {
     for (int j = 0; j < Input.touchCount; j++) 
         {
         if(Input.GetTouch(j).phase == TouchPhase.Began)
             {
                 groundRay = Camera.main.ScreenPointToRay (Input.GetTouch(j).position);
                 if (Physics.Raycast (groundRay, Mathf.Infinity)) 
                 {
                     
                     SendMessage ("OnFire");
                 }
             }
         }
     }

But like this way with the mouse input it works well. What is wrong?

 if(!EventSystem.current.IsPointerOverGameObject())
     {
     
     if(Input.GetMouseButtonDown(0))
         {
             groundRay = Camera.main.ScreenPointToRay (Input.mousePosition);
             if (Physics.Raycast (groundRay, Mathf.Infinity)) 
             {    
                 SendMessage ("OnFire");
             }
         }
     }