if ( Physics.Raycast ( ray, out hit, Mathf.Infinity, LayerMask ) ) not working?

Why isn't it working when I put in that condition?

It works fine when I remove it, but I really need to make it so that it will only be executed when the player is touching the specific LayerMask.

EDIT: **not touching the specific LayerMask.

When I remove it, the code inside gets executed properly but it still gets executed even when I'm not touching the object with the said LayerMask.

I don't want it to get executed when it's not touching the LayerMask, and when I put in the condition to make it so, it doesn't get executed at all, wherever I touch the screen.

Here's the code I'm using...

 using UnityEngine;
 using System.Collections;
 
 public class TouchMovement : MonoBehaviour {
 
 private RaycastHit hit;
 
 public static bool moving;
 
 Ray ray;
 
 int currTouch;
 int touch2watch;
 
 LayerMask layerZ;
 
 void Start ()
     {
         layerZ = 1 << 12;
             //All layers except the 12th one...
         layerZ = ~layerZ;
 
         touch2watch = 64;
 
         moving = false;
     }
 
 void Update ()
     {
 if(Input.touchCount > 0)
         {
             for(int i = 0; i < Input.touchCount; i++)
             {
 
                     currTouch = i;
 
                     //If the player hits any position on the screen EXCEPT for the object with the layerZ...
                     if(Physics.Raycast(ray, out hit, Mathf.Infinity, layerZ))
                     {
                         //Write "touched"
                         Debug.Log ("touched");
 
                     //Why is Debug.Log ("touched") not being executed? Including the ones below it...
                     //When I remove the condition "if(Physics.Raycast...", it works fine.
                     //But I need it so that this block of code will only be executed when the player is not hitting the object with the LayerZ.
 
                         if(Input.GetTouch(i).phase == TouchPhase.Began && !moving)
                         {
                             touch2watch = currTouch;
 
                             if(touch2watch == currTouch)
                             {
                                 moving = true;
                             }
 
 
                         }
 
                     }
 
 
                 if(touch2watch == currTouch)
                 {
 
                     if(Input.GetTouch(i).phase == TouchPhase.Ended)
                     {
                         touch2watch = 64;
                     }
 
                     if(Input.GetTouch(i).phase == TouchPhase.Ended)
                     {
                         moving = false;
                     }
 
                 }
 
 
                 
             }
 
             
         }
     }
 }

Thanks!